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[rpc] Add WebSocket metrics (#2413)

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This commit is contained in:
Salvador Girones Gil 2023-08-16 14:27:53 +02:00 committed by GitHub
parent 4288d9f188
commit 3b26ad2a44
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GPG key ID: 4AEE18F83AFDEB23
16 changed files with 1295 additions and 1062 deletions
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2
dev/docker/compose.yaml
View file

@ -2,7 +2,7 @@
version: "3"
services:
grafana:
image: "grafana/grafana-oss:latest"
image: "grafana/grafana-oss:main"
expose:
- "3000"
ports:

4
src/cli/start.rs
View file

@ -11,6 +11,7 @@ use crate::net::{self, client_ip::ClientIp};
use crate::node;
use clap::Args;
use ipnet::IpNet;
use opentelemetry::Context as TelemetryContext;
use std::net::SocketAddr;
use std::path::PathBuf;
use std::time::Duration;
@ -123,6 +124,9 @@ pub async fn init(
) -> Result<(), Error> {
// Initialize opentelemetry and logging
crate::telemetry::builder().with_filter(log).init();
// Start metrics subsystem
crate::telemetry::metrics::init(&TelemetryContext::current())
.expect("failed to initialize metrics");
// Check if a banner should be outputted
if !no_banner {

5
src/net/mod.rs
View file

@ -129,7 +129,7 @@ pub async fn init() -> Result<(), Error> {
.merge(key::router())
.layer(service);
// Setup the graceful shutdown with no timeout
// Setup the graceful shutdown
let handle = Handle::new();
let shutdown_handler = graceful_shutdown(handle.clone());
@ -159,9 +159,6 @@ pub async fn init() -> Result<(), Error> {
// Wait for the shutdown to finish
let _ = shutdown_handler.await;
// Flush all telemetry data
opentelemetry::global::shutdown_tracer_provider();
info!(target: LOG, "Web server stopped. Bye!");
Ok(())

899
src/net/rpc.rs
View file

@ -1,58 +1,17 @@
use crate::cnf::MAX_CONCURRENT_CALLS;
use crate::cnf::PKG_NAME;
use crate::cnf::PKG_VERSION;
use crate::cnf::WEBSOCKET_PING_FREQUENCY;
use crate::dbs::DB;
use crate::err::Error;
use crate::rpc::args::Take;
use crate::rpc::paths::{ID, METHOD, PARAMS};
use crate::rpc::res;
use crate::rpc::res::Data;
use crate::rpc::res::Failure;
use crate::rpc::res::IntoRpcResponse;
use crate::rpc::res::OutputFormat;
use crate::rpc::CONN_CLOSED_ERR;
use crate::telemetry::traces::rpc::span_for_request;
use crate::rpc::connection::Connection;
use axum::routing::get;
use axum::Extension;
use axum::Router;
use futures::{SinkExt, StreamExt};
use futures_util::stream::SplitSink;
use futures_util::stream::SplitStream;
use http_body::Body as HttpBody;
use once_cell::sync::Lazy;
use std::collections::BTreeMap;
use std::collections::HashMap;
use std::sync::Arc;
use surrealdb::channel;
use surrealdb::channel::{Receiver, Sender};
use surrealdb::dbs::{QueryType, Response, Session};
use surrealdb::sql::serde::deserialize;
use surrealdb::sql::Array;
use surrealdb::sql::Object;
use surrealdb::sql::Strand;
use surrealdb::sql::Value;
use tokio::sync::RwLock;
use tokio::task::JoinSet;
use tokio_util::sync::CancellationToken;
use surrealdb::dbs::Session;
use tower_http::request_id::RequestId;
use tracing::Span;
use uuid::Uuid;
use axum::{
extract::ws::{Message, WebSocket, WebSocketUpgrade},
extract::ws::{WebSocket, WebSocketUpgrade},
response::IntoResponse,
};
// Mapping of WebSocketID to WebSocket
pub(crate) struct WebSocketRef(pub(crate) Sender<Message>, pub(crate) CancellationToken);
type WebSockets = RwLock<HashMap<Uuid, WebSocketRef>>;
// Mapping of LiveQueryID to WebSocketID
type LiveQueries = RwLock<HashMap<Uuid, Uuid>>;
pub(super) static WEBSOCKETS: Lazy<WebSockets> = Lazy::new(WebSockets::default);
static LIVE_QUERIES: Lazy<LiveQueries> = Lazy::new(LiveQueries::default);
pub(super) fn router<S, B>() -> Router<S, B>
where
B: HttpBody + Send + 'static,
@ -72,853 +31,13 @@ async fn handler(
}
async fn handle_socket(ws: WebSocket, sess: Session, req_id: RequestId) {
let rpc = Rpc::new(sess);
let rpc = Connection::new(sess);
// If the request ID is a valid UUID and is not already in use, use it as the WebSocket ID
match req_id.header_value().to_str().map(Uuid::parse_str) {
Ok(Ok(req_id)) if !WEBSOCKETS.read().await.contains_key(&req_id) => {
rpc.write().await.ws_id = req_id
}
_ => (),
// Update the WebSocket ID with the Request ID
if let Ok(Ok(req_id)) = req_id.header_value().to_str().map(Uuid::parse_str) {
// If the ID couldn't be updated, ignore the error and keep the default ID
let _ = rpc.write().await.update_ws_id(req_id).await;
}
Rpc::serve(rpc, ws).await;
}
pub struct Rpc {
session: Session,
format: OutputFormat,
ws_id: Uuid,
vars: BTreeMap<String, Value>,
graceful_shutdown: CancellationToken,
}
impl Rpc {
/// Instantiate a new RPC
pub fn new(mut session: Session) -> Arc<RwLock<Rpc>> {
// Create a new RPC variables store
let vars = BTreeMap::new();
// Set the default output format
let format = OutputFormat::Json;
// Enable real-time mode
session.rt = true;
// Create and store the Rpc connection
Arc::new(RwLock::new(Rpc {
session,
format,
ws_id: Uuid::new_v4(),
vars,
graceful_shutdown: CancellationToken::new(),
}))
}
/// Serve the RPC endpoint
pub async fn serve(rpc: Arc<RwLock<Rpc>>, ws: WebSocket) {
// Split the socket into send and recv
let (sender, receiver) = ws.split();
// Create an internal channel between the receiver and the sender
let (internal_sender, internal_receiver) = channel::new(MAX_CONCURRENT_CALLS);
let ws_id = rpc.read().await.ws_id;
// Store this WebSocket in the list of WebSockets
WEBSOCKETS.write().await.insert(
ws_id,
WebSocketRef(internal_sender.clone(), rpc.read().await.graceful_shutdown.clone()),
);
trace!("WebSocket {} connected", ws_id);
// Wait until all tasks finish
tokio::join!(
Self::ping(rpc.clone(), internal_sender.clone()),
Self::read(rpc.clone(), receiver, internal_sender.clone()),
Self::write(rpc.clone(), sender, internal_receiver.clone()),
Self::lq_notifications(rpc.clone()),
);
// Remove all live queries
LIVE_QUERIES.write().await.retain(|key, value| {
if value == &ws_id {
trace!("Removing live query: {}", key);
return false;
}
true
});
// Remove this WebSocket from the list of WebSockets
WEBSOCKETS.write().await.remove(&ws_id);
trace!("WebSocket {} disconnected", ws_id);
}
/// Send Ping messages to the client
async fn ping(rpc: Arc<RwLock<Rpc>>, internal_sender: Sender<Message>) {
// Create the interval ticker
let mut interval = tokio::time::interval(WEBSOCKET_PING_FREQUENCY);
let cancel_token = rpc.read().await.graceful_shutdown.clone();
loop {
let is_shutdown = cancel_token.cancelled();
tokio::select! {
_ = interval.tick() => {
let msg = Message::Ping(vec![]);
// Send the message to the client and close the WebSocket connection if it fails
if internal_sender.send(msg).await.is_err() {
rpc.read().await.graceful_shutdown.cancel();
break;
}
},
_ = is_shutdown => break,
}
}
}
/// Read messages sent from the client
async fn read(
rpc: Arc<RwLock<Rpc>>,
mut receiver: SplitStream<WebSocket>,
internal_sender: Sender<Message>,
) {
// Collect all spawned tasks so we can wait for them at the end
let mut tasks = JoinSet::new();
let cancel_token = rpc.read().await.graceful_shutdown.clone();
loop {
let is_shutdown = cancel_token.cancelled();
tokio::select! {
msg = receiver.next() => {
if let Some(msg) = msg {
match msg {
// We've received a message from the client
// Ping/Pong is automatically handled by the WebSocket library
Ok(msg) => match msg {
Message::Text(_) => {
tasks.spawn(Rpc::handle_msg(rpc.clone(), msg, internal_sender.clone()));
}
Message::Binary(_) => {
tasks.spawn(Rpc::handle_msg(rpc.clone(), msg, internal_sender.clone()));
}
Message::Close(_) => {
// Respond with a close message
if let Err(err) = internal_sender.send(Message::Close(None)).await {
trace!("WebSocket error when replying to the Close frame: {:?}", err);
};
// Start the graceful shutdown of the WebSocket and close the channels
rpc.read().await.graceful_shutdown.cancel();
let _ = internal_sender.close();
break;
}
_ => {
// Ignore everything else
}
},
Err(err) => {
trace!("WebSocket error: {:?}", err);
// Start the graceful shutdown of the WebSocket and close the channels
rpc.read().await.graceful_shutdown.cancel();
let _ = internal_sender.close();
// Exit out of the loop
break;
}
}
}
}
_ = is_shutdown => break,
}
}
// Wait for all tasks to finish
while let Some(res) = tasks.join_next().await {
if let Err(err) = res {
error!("Error while handling RPC message: {}", err);
}
}
}
/// Write messages to the client
async fn write(
rpc: Arc<RwLock<Rpc>>,
mut sender: SplitSink<WebSocket, Message>,
mut internal_receiver: Receiver<Message>,
) {
let cancel_token = rpc.read().await.graceful_shutdown.clone();
loop {
let is_shutdown = cancel_token.cancelled();
tokio::select! {
// Wait for the next message to send
msg = internal_receiver.next() => {
if let Some(res) = msg {
// Send the message to the client
if let Err(err) = sender.send(res).await {
if err.to_string() != CONN_CLOSED_ERR {
debug!("WebSocket error: {:?}", err);
}
// Close the WebSocket connection
rpc.read().await.graceful_shutdown.cancel();
// Exit out of the loop
break;
}
}
},
_ = is_shutdown => break,
}
}
}
/// Send live query notifications to the client
async fn lq_notifications(rpc: Arc<RwLock<Rpc>>) {
if let Some(channel) = DB.get().unwrap().notifications() {
let cancel_token = rpc.read().await.graceful_shutdown.clone();
loop {
tokio::select! {
msg = channel.recv() => {
if let Ok(notification) = msg {
// Find which WebSocket the notification belongs to
if let Some(ws_id) = LIVE_QUERIES.read().await.get(&notification.id) {
// Check to see if the WebSocket exists
if let Some(WebSocketRef(ws, _)) = WEBSOCKETS.read().await.get(ws_id) {
// Serialize the message to send
let message = res::success(None, notification);
// Get the current output format
let format = rpc.read().await.format.clone();
// Send the notification to the client
message.send(format, ws.clone()).await
}
}
}
},
_ = cancel_token.cancelled() => break,
}
}
}
}
/// Handle individual WebSocket messages
async fn handle_msg(rpc: Arc<RwLock<Rpc>>, msg: Message, chn: Sender<Message>) {
// Get the current output format
let mut out_fmt = rpc.read().await.format.clone();
let span = span_for_request(&rpc.read().await.ws_id);
let _enter = span.enter();
// Parse the request
match Self::parse_request(msg).await {
Ok((id, method, params, _out_fmt)) => {
span.record(
"rpc.jsonrpc.request_id",
id.clone().map(|v| v.as_string()).unwrap_or(String::new()),
);
if let Some(_out_fmt) = _out_fmt {
out_fmt = _out_fmt;
}
// Process the request
let res = Self::process_request(rpc.clone(), &method, params).await;
// Process the response
res.into_response(id).send(out_fmt, chn).await
}
Err(err) => {
// Process the response
res::failure(None, err).send(out_fmt, chn).await
}
}
}
async fn parse_request(
msg: Message,
) -> Result<(Option<Value>, String, Array, Option<OutputFormat>), Failure> {
let mut out_fmt = None;
let req = match msg {
// This is a binary message
Message::Binary(val) => {
// Use binary output
out_fmt = Some(OutputFormat::Full);
match deserialize(&val) {
Ok(v) => v,
Err(_) => {
debug!("Error when trying to deserialize the request");
return Err(Failure::PARSE_ERROR);
}
}
}
// This is a text message
Message::Text(ref val) => {
// Parse the SurrealQL object
match surrealdb::sql::value(val) {
// The SurrealQL message parsed ok
Ok(v) => v,
// The SurrealQL message failed to parse
_ => return Err(Failure::PARSE_ERROR),
}
}
// Unsupported message type
_ => {
debug!("Unsupported message type: {:?}", msg);
return Err(res::Failure::custom("Unsupported message type"));
}
};
// Fetch the 'id' argument
let id = match req.pick(&*ID) {
v if v.is_none() => None,
v if v.is_null() => Some(v),
v if v.is_uuid() => Some(v),
v if v.is_number() => Some(v),
v if v.is_strand() => Some(v),
v if v.is_datetime() => Some(v),
_ => return Err(Failure::INVALID_REQUEST),
};
// Fetch the 'method' argument
let method = match req.pick(&*METHOD) {
Value::Strand(v) => v.to_raw(),
_ => return Err(Failure::INVALID_REQUEST),
};
// Now that we know the method, we can update the span
Span::current().record("rpc.method", &method);
Span::current().record("otel.name", format!("surrealdb.rpc/{}", method));
// Fetch the 'params' argument
let params = match req.pick(&*PARAMS) {
Value::Array(v) => v,
_ => Array::new(),
};
Ok((id, method, params, out_fmt))
}
async fn process_request(
rpc: Arc<RwLock<Rpc>>,
method: &str,
params: Array,
) -> Result<Data, Failure> {
info!("Process RPC request");
// Match the method to a function
match method {
// Handle a surrealdb ping message
//
// This is used to keep the WebSocket connection alive in environments where the WebSocket protocol is not enough.
// For example, some browsers will wait for the TCP protocol to timeout before triggering an on_close event. This may take several seconds or even minutes in certain scenarios.
// By sending a ping message every few seconds from the client, we can force a connection check and trigger a an on_close event if the ping can't be sent.
//
"ping" => Ok(Value::None.into()),
// Retrieve the current auth record
"info" => match params.len() {
0 => rpc.read().await.info().await.map(Into::into).map_err(Into::into),
_ => Err(Failure::INVALID_PARAMS),
},
// Switch to a specific namespace and database
"use" => match params.needs_two() {
Ok((ns, db)) => {
rpc.write().await.yuse(ns, db).await.map(Into::into).map_err(Into::into)
}
_ => Err(Failure::INVALID_PARAMS),
},
// Signup to a specific authentication scope
"signup" => match params.needs_one() {
Ok(Value::Object(v)) => {
rpc.write().await.signup(v).await.map(Into::into).map_err(Into::into)
}
_ => Err(Failure::INVALID_PARAMS),
},
// Signin as a root, namespace, database or scope user
"signin" => match params.needs_one() {
Ok(Value::Object(v)) => {
rpc.write().await.signin(v).await.map(Into::into).map_err(Into::into)
}
_ => Err(Failure::INVALID_PARAMS),
},
// Invalidate the current authentication session
"invalidate" => match params.len() {
0 => rpc.write().await.invalidate().await.map(Into::into).map_err(Into::into),
_ => Err(Failure::INVALID_PARAMS),
},
// Authenticate using an authentication token
"authenticate" => match params.needs_one() {
Ok(Value::Strand(v)) => {
rpc.write().await.authenticate(v).await.map(Into::into).map_err(Into::into)
}
_ => Err(Failure::INVALID_PARAMS),
},
// Kill a live query using a query id
"kill" => match params.needs_one() {
Ok(v) => rpc.read().await.kill(v).await.map(Into::into).map_err(Into::into),
_ => Err(Failure::INVALID_PARAMS),
},
// Setup a live query on a specific table
"live" => match params.needs_one_or_two() {
Ok((v, d)) if v.is_table() => {
rpc.read().await.live(v, d).await.map(Into::into).map_err(Into::into)
}
Ok((v, d)) if v.is_strand() => {
rpc.read().await.live(v, d).await.map(Into::into).map_err(Into::into)
}
_ => Err(Failure::INVALID_PARAMS),
},
// Specify a connection-wide parameter
"let" | "set" => match params.needs_one_or_two() {
Ok((Value::Strand(s), v)) => {
rpc.write().await.set(s, v).await.map(Into::into).map_err(Into::into)
}
_ => Err(Failure::INVALID_PARAMS),
},
// Unset and clear a connection-wide parameter
"unset" => match params.needs_one() {
Ok(Value::Strand(s)) => {
rpc.write().await.unset(s).await.map(Into::into).map_err(Into::into)
}
_ => Err(Failure::INVALID_PARAMS),
},
// Select a value or values from the database
"select" => match params.needs_one() {
Ok(v) => rpc.read().await.select(v).await.map(Into::into).map_err(Into::into),
_ => Err(Failure::INVALID_PARAMS),
},
// Insert a value or values in the database
"insert" => match params.needs_one_or_two() {
Ok((v, o)) => {
rpc.read().await.insert(v, o).await.map(Into::into).map_err(Into::into)
}
_ => Err(Failure::INVALID_PARAMS),
},
// Create a value or values in the database
"create" => match params.needs_one_or_two() {
Ok((v, o)) => {
rpc.read().await.create(v, o).await.map(Into::into).map_err(Into::into)
}
_ => Err(Failure::INVALID_PARAMS),
},
// Update a value or values in the database using `CONTENT`
"update" => match params.needs_one_or_two() {
Ok((v, o)) => {
rpc.read().await.update(v, o).await.map(Into::into).map_err(Into::into)
}
_ => Err(Failure::INVALID_PARAMS),
},
// Update a value or values in the database using `MERGE`
"change" | "merge" => match params.needs_one_or_two() {
Ok((v, o)) => {
rpc.read().await.change(v, o).await.map(Into::into).map_err(Into::into)
}
_ => Err(Failure::INVALID_PARAMS),
},
// Update a value or values in the database using `PATCH`
"modify" | "patch" => match params.needs_one_or_two() {
Ok((v, o)) => {
rpc.read().await.modify(v, o).await.map(Into::into).map_err(Into::into)
}
_ => Err(Failure::INVALID_PARAMS),
},
// Delete a value or values from the database
"delete" => match params.needs_one() {
Ok(v) => rpc.read().await.delete(v).await.map(Into::into).map_err(Into::into),
_ => Err(Failure::INVALID_PARAMS),
},
// Specify the output format for text requests
"format" => match params.needs_one() {
Ok(Value::Strand(v)) => {
rpc.write().await.format(v).await.map(Into::into).map_err(Into::into)
}
_ => Err(Failure::INVALID_PARAMS),
},
// Get the current server version
"version" => match params.len() {
0 => Ok(format!("{PKG_NAME}-{}", *PKG_VERSION).into()),
_ => Err(Failure::INVALID_PARAMS),
},
// Run a full SurrealQL query against the database
"query" => match params.needs_one_or_two() {
Ok((Value::Strand(s), o)) if o.is_none_or_null() => {
rpc.read().await.query(s).await.map(Into::into).map_err(Into::into)
}
Ok((Value::Strand(s), Value::Object(o))) => {
rpc.read().await.query_with(s, o).await.map(Into::into).map_err(Into::into)
}
_ => Err(Failure::INVALID_PARAMS),
},
_ => Err(Failure::METHOD_NOT_FOUND),
}
}
// ------------------------------
// Methods for authentication
// ------------------------------
async fn format(&mut self, out: Strand) -> Result<Value, Error> {
match out.as_str() {
"json" | "application/json" => self.format = OutputFormat::Json,
"cbor" | "application/cbor" => self.format = OutputFormat::Cbor,
"pack" | "application/pack" => self.format = OutputFormat::Pack,
_ => return Err(Error::InvalidType),
};
Ok(Value::None)
}
async fn yuse(&mut self, ns: Value, db: Value) -> Result<Value, Error> {
if let Value::Strand(ns) = ns {
self.session.ns = Some(ns.0);
}
if let Value::Strand(db) = db {
self.session.db = Some(db.0);
}
Ok(Value::None)
}
async fn signup(&mut self, vars: Object) -> Result<Value, Error> {
let kvs = DB.get().unwrap();
surrealdb::iam::signup::signup(kvs, &mut self.session, vars)
.await
.map(Into::into)
.map_err(Into::into)
}
async fn signin(&mut self, vars: Object) -> Result<Value, Error> {
let kvs = DB.get().unwrap();
surrealdb::iam::signin::signin(kvs, &mut self.session, vars)
.await
.map(Into::into)
.map_err(Into::into)
}
async fn invalidate(&mut self) -> Result<Value, Error> {
surrealdb::iam::clear::clear(&mut self.session)?;
Ok(Value::None)
}
async fn authenticate(&mut self, token: Strand) -> Result<Value, Error> {
let kvs = DB.get().unwrap();
surrealdb::iam::verify::token(kvs, &mut self.session, &token.0).await?;
Ok(Value::None)
}
// ------------------------------
// Methods for identification
// ------------------------------
async fn info(&self) -> Result<Value, Error> {
// Get a database reference
let kvs = DB.get().unwrap();
// Specify the SQL query string
let sql = "SELECT * FROM $auth";
// Execute the query on the database
let mut res = kvs.execute(sql, &self.session, None).await?;
// Extract the first value from the result
let res = res.remove(0).result?.first();
// Return the result to the client
Ok(res)
}
// ------------------------------
// Methods for setting variables
// ------------------------------
async fn set(&mut self, key: Strand, val: Value) -> Result<Value, Error> {
match val {
// Remove the variable if undefined
Value::None => self.vars.remove(&key.0),
// Store the variable if defined
v => self.vars.insert(key.0, v),
};
Ok(Value::Null)
}
async fn unset(&mut self, key: Strand) -> Result<Value, Error> {
self.vars.remove(&key.0);
Ok(Value::Null)
}
// ------------------------------
// Methods for live queries
// ------------------------------
async fn kill(&self, id: Value) -> Result<Value, Error> {
// Specify the SQL query string
let sql = "KILL $id";
// Specify the query parameters
let var = map! {
String::from("id") => id, // NOTE: id can be parameter
=> &self.vars
};
// Execute the query on the database
let mut res = self.query_with(Strand::from(sql), Object::from(var)).await?;
// Extract the first query result
let response = res.remove(0);
match response.result {
Ok(v) => Ok(v),
Err(e) => Err(Error::from(e)),
}
}
async fn live(&self, tb: Value, diff: Value) -> Result<Value, Error> {
// Specify the SQL query string
let sql = match diff.is_true() {
true => "LIVE SELECT DIFF FROM $tb",
false => "LIVE SELECT * FROM $tb",
};
// Specify the query parameters
let var = map! {
String::from("tb") => tb.could_be_table(),
=> &self.vars
};
// Execute the query on the database
let mut res = self.query_with(Strand::from(sql), Object::from(var)).await?;
// Extract the first query result
let response = res.remove(0);
match response.result {
Ok(v) => Ok(v),
Err(e) => Err(Error::from(e)),
}
}
// ------------------------------
// Methods for selecting
// ------------------------------
async fn select(&self, what: Value) -> Result<Value, Error> {
// Return a single result?
let one = what.is_thing();
// Get a database reference
let kvs = DB.get().unwrap();
// Specify the SQL query string
let sql = "SELECT * FROM $what";
// Specify the query parameters
let var = Some(map! {
String::from("what") => what.could_be_table(),
=> &self.vars
});
// Execute the query on the database
let mut res = kvs.execute(sql, &self.session, var).await?;
// Extract the first query result
let res = match one {
true => res.remove(0).result?.first(),
false => res.remove(0).result?,
};
// Return the result to the client
Ok(res)
}
// ------------------------------
// Methods for inserting
// ------------------------------
async fn insert(&self, what: Value, data: Value) -> Result<Value, Error> {
// Return a single result?
let one = what.is_thing();
// Get a database reference
let kvs = DB.get().unwrap();
// Specify the SQL query string
let sql = "INSERT INTO $what $data RETURN AFTER";
// Specify the query parameters
let var = Some(map! {
String::from("what") => what.could_be_table(),
String::from("data") => data,
=> &self.vars
});
// Execute the query on the database
let mut res = kvs.execute(sql, &self.session, var).await?;
// Extract the first query result
let res = match one {
true => res.remove(0).result?.first(),
false => res.remove(0).result?,
};
// Return the result to the client
Ok(res)
}
// ------------------------------
// Methods for creating
// ------------------------------
async fn create(&self, what: Value, data: Value) -> Result<Value, Error> {
// Return a single result?
let one = what.is_thing();
// Get a database reference
let kvs = DB.get().unwrap();
// Specify the SQL query string
let sql = "CREATE $what CONTENT $data RETURN AFTER";
// Specify the query parameters
let var = Some(map! {
String::from("what") => what.could_be_table(),
String::from("data") => data,
=> &self.vars
});
// Execute the query on the database
let mut res = kvs.execute(sql, &self.session, var).await?;
// Extract the first query result
let res = match one {
true => res.remove(0).result?.first(),
false => res.remove(0).result?,
};
// Return the result to the client
Ok(res)
}
// ------------------------------
// Methods for updating
// ------------------------------
async fn update(&self, what: Value, data: Value) -> Result<Value, Error> {
// Return a single result?
let one = what.is_thing();
// Get a database reference
let kvs = DB.get().unwrap();
// Specify the SQL query string
let sql = "UPDATE $what CONTENT $data RETURN AFTER";
// Specify the query parameters
let var = Some(map! {
String::from("what") => what.could_be_table(),
String::from("data") => data,
=> &self.vars
});
// Execute the query on the database
let mut res = kvs.execute(sql, &self.session, var).await?;
// Extract the first query result
let res = match one {
true => res.remove(0).result?.first(),
false => res.remove(0).result?,
};
// Return the result to the client
Ok(res)
}
// ------------------------------
// Methods for changing
// ------------------------------
async fn change(&self, what: Value, data: Value) -> Result<Value, Error> {
// Return a single result?
let one = what.is_thing();
// Get a database reference
let kvs = DB.get().unwrap();
// Specify the SQL query string
let sql = "UPDATE $what MERGE $data RETURN AFTER";
// Specify the query parameters
let var = Some(map! {
String::from("what") => what.could_be_table(),
String::from("data") => data,
=> &self.vars
});
// Execute the query on the database
let mut res = kvs.execute(sql, &self.session, var).await?;
// Extract the first query result
let res = match one {
true => res.remove(0).result?.first(),
false => res.remove(0).result?,
};
// Return the result to the client
Ok(res)
}
// ------------------------------
// Methods for modifying
// ------------------------------
async fn modify(&self, what: Value, data: Value) -> Result<Value, Error> {
// Return a single result?
let one = what.is_thing();
// Get a database reference
let kvs = DB.get().unwrap();
// Specify the SQL query string
let sql = "UPDATE $what PATCH $data RETURN DIFF";
// Specify the query parameters
let var = Some(map! {
String::from("what") => what.could_be_table(),
String::from("data") => data,
=> &self.vars
});
// Execute the query on the database
let mut res = kvs.execute(sql, &self.session, var).await?;
// Extract the first query result
let res = match one {
true => res.remove(0).result?.first(),
false => res.remove(0).result?,
};
// Return the result to the client
Ok(res)
}
// ------------------------------
// Methods for deleting
// ------------------------------
async fn delete(&self, what: Value) -> Result<Value, Error> {
// Return a single result?
let one = what.is_thing();
// Get a database reference
let kvs = DB.get().unwrap();
// Specify the SQL query string
let sql = "DELETE $what RETURN BEFORE";
// Specify the query parameters
let var = Some(map! {
String::from("what") => what.could_be_table(),
=> &self.vars
});
// Execute the query on the database
let mut res = kvs.execute(sql, &self.session, var).await?;
// Extract the first query result
let res = match one {
true => res.remove(0).result?.first(),
false => res.remove(0).result?,
};
// Return the result to the client
Ok(res)
}
// ------------------------------
// Methods for querying
// ------------------------------
async fn query(&self, sql: Strand) -> Result<Vec<Response>, Error> {
// Get a database reference
let kvs = DB.get().unwrap();
// Specify the query parameters
let var = Some(self.vars.clone());
// Execute the query on the database
let res = kvs.execute(&sql, &self.session, var).await?;
// Post-process hooks for web layer
for response in &res {
self.handle_live_query_results(response).await;
}
// Return the result to the client
Ok(res)
}
async fn query_with(&self, sql: Strand, mut vars: Object) -> Result<Vec<Response>, Error> {
// Get a database reference
let kvs = DB.get().unwrap();
// Specify the query parameters
let var = Some(mrg! { vars.0, &self.vars });
// Execute the query on the database
let res = kvs.execute(&sql, &self.session, var).await?;
// Post-process hooks for web layer
for response in &res {
self.handle_live_query_results(response).await;
}
// Return the result to the client
Ok(res)
}
// ------------------------------
// Private methods
// ------------------------------
async fn handle_live_query_results(&self, res: &Response) {
match &res.query_type {
QueryType::Live => {
if let Ok(Value::Uuid(lqid)) = &res.result {
// Match on Uuid type
LIVE_QUERIES.write().await.insert(lqid.0, self.ws_id);
trace!("Registered live query {} on websocket {}", lqid, self.ws_id);
}
}
QueryType::Kill => {
if let Ok(Value::Uuid(lqid)) = &res.result {
let ws_id = LIVE_QUERIES.write().await.remove(&lqid.0);
if let Some(ws_id) = ws_id {
trace!("Unregistered live query {} on websocket {}", lqid, ws_id);
}
}
}
_ => {}
}
}
Connection::serve(rpc, ws).await;
}

24
src/net/signals.rs
View file

@ -1,12 +1,7 @@
use std::time::Duration;
use axum_server::Handle;
use tokio::task::JoinHandle;
use crate::{
err::Error,
net::rpc::{WebSocketRef, WEBSOCKETS},
};
use crate::{err::Error, rpc, telemetry};
/// Start a graceful shutdown:
/// * Signal the Axum Handle when a shutdown signal is received.
@ -24,15 +19,12 @@ pub fn graceful_shutdown(http_handle: Handle) -> JoinHandle<()> {
// First stop accepting new HTTP requests
http_handle.graceful_shutdown(None);
// Close all WebSocket connections. Queued messages will still be processed.
for (_, WebSocketRef(_, cancel_token)) in WEBSOCKETS.read().await.iter() {
cancel_token.cancel();
};
rpc::graceful_shutdown().await;
// Wait for all existing WebSocket connections to gracefully close
while WEBSOCKETS.read().await.len() > 0 {
tokio::time::sleep(Duration::from_millis(100)).await;
};
// Flush all telemetry data
if let Err(err) = telemetry::shutdown() {
error!("Failed to flush telemetry data: {}", err);
}
} => (),
// Force an immediate shutdown if a second signal is received
_ = async {
@ -46,9 +38,7 @@ pub fn graceful_shutdown(http_handle: Handle) -> JoinHandle<()> {
http_handle.shutdown();
// Close all WebSocket connections immediately
if let Ok(mut writer) = WEBSOCKETS.try_write() {
writer.drain();
}
rpc::shutdown();
} => (),
}
})

302
src/rpc/connection.rs Normal file
View file

@ -0,0 +1,302 @@
use axum::extract::ws::{Message, WebSocket};
use futures_util::stream::{SplitSink, SplitStream};
use futures_util::{SinkExt, StreamExt};
use opentelemetry::trace::FutureExt;
use opentelemetry::Context as TelemetryContext;
use std::collections::BTreeMap;
use std::sync::Arc;
use surrealdb::channel::{self, Receiver, Sender};
use tokio::sync::RwLock;
use surrealdb::dbs::Session;
use tokio::task::JoinSet;
use tokio_util::sync::CancellationToken;
use uuid::Uuid;
use crate::cnf::{MAX_CONCURRENT_CALLS, WEBSOCKET_PING_FREQUENCY};
use crate::dbs::DB;
use crate::rpc::res::success;
use crate::rpc::{WebSocketRef, CONN_CLOSED_ERR, LIVE_QUERIES, WEBSOCKETS};
use crate::telemetry;
use crate::telemetry::metrics::ws::RequestContext;
use crate::telemetry::traces::rpc::span_for_request;
use super::processor::Processor;
use super::request::parse_request;
use super::res::{failure, IntoRpcResponse, OutputFormat};
pub struct Connection {
ws_id: Uuid,
processor: Processor,
graceful_shutdown: CancellationToken,
}
impl Connection {
/// Instantiate a new RPC
pub fn new(mut session: Session) -> Arc<RwLock<Connection>> {
// Create a new RPC variables store
let vars = BTreeMap::new();
// Set the default output format
let format = OutputFormat::Json;
// Enable real-time mode
session.rt = true;
// Create a new RPC processor
let processor = Processor::new(session, format, vars);
// Create and store the RPC connection
Arc::new(RwLock::new(Connection {
ws_id: processor.ws_id,
processor,
graceful_shutdown: CancellationToken::new(),
}))
}
/// Update the WebSocket ID. If the ID already exists, do not update it.
pub async fn update_ws_id(&mut self, ws_id: Uuid) -> Result<(), Box<dyn std::error::Error>> {
if WEBSOCKETS.read().await.contains_key(&ws_id) {
trace!("WebSocket ID '{}' is in use by another connection. Do not update it.", &ws_id);
return Err("websocket ID is in use".into());
}
self.ws_id = ws_id;
self.processor.ws_id = ws_id;
Ok(())
}
/// Serve the RPC endpoint
pub async fn serve(rpc: Arc<RwLock<Connection>>, ws: WebSocket) {
// Split the socket into send and recv
let (sender, receiver) = ws.split();
// Create an internal channel between the receiver and the sender
let (internal_sender, internal_receiver) = channel::new(MAX_CONCURRENT_CALLS);
let ws_id = rpc.read().await.ws_id;
trace!("WebSocket {} connected", ws_id);
if let Err(err) = telemetry::metrics::ws::on_connect() {
error!("Error running metrics::ws::on_connect hook: {}", err);
}
// Add this WebSocket to the list
WEBSOCKETS.write().await.insert(
ws_id,
WebSocketRef(internal_sender.clone(), rpc.read().await.graceful_shutdown.clone()),
);
// Remove all live queries
LIVE_QUERIES.write().await.retain(|key, value| {
if value == &ws_id {
trace!("Removing live query: {}", key);
return false;
}
true
});
let mut tasks = JoinSet::new();
tasks.spawn(Self::ping(rpc.clone(), internal_sender.clone()));
tasks.spawn(Self::read(rpc.clone(), receiver, internal_sender.clone()));
tasks.spawn(Self::write(rpc.clone(), sender, internal_receiver.clone()));
tasks.spawn(Self::lq_notifications(rpc.clone()));
// Wait until all tasks finish
while let Some(res) = tasks.join_next().await {
if let Err(err) = res {
error!("Error handling RPC connection: {}", err);
}
}
// Remove this WebSocket from the list
WEBSOCKETS.write().await.remove(&ws_id);
trace!("WebSocket {} disconnected", ws_id);
if let Err(err) = telemetry::metrics::ws::on_disconnect() {
error!("Error running metrics::ws::on_disconnect hook: {}", err);
}
}
/// Send Ping messages to the client
async fn ping(rpc: Arc<RwLock<Connection>>, internal_sender: Sender<Message>) {
// Create the interval ticker
let mut interval = tokio::time::interval(WEBSOCKET_PING_FREQUENCY);
let cancel_token = rpc.read().await.graceful_shutdown.clone();
loop {
let is_shutdown = cancel_token.cancelled();
tokio::select! {
_ = interval.tick() => {
let msg = Message::Ping(vec![]);
// Send the message to the client and close the WebSocket connection if it fails
if internal_sender.send(msg).await.is_err() {
rpc.read().await.graceful_shutdown.cancel();
break;
}
},
_ = is_shutdown => break,
}
}
}
/// Read messages sent from the client
async fn read(
rpc: Arc<RwLock<Connection>>,
mut receiver: SplitStream<WebSocket>,
internal_sender: Sender<Message>,
) {
// Collect all spawned tasks so we can wait for them at the end
let mut tasks = JoinSet::new();
let cancel_token = rpc.read().await.graceful_shutdown.clone();
loop {
let is_shutdown = cancel_token.cancelled();
tokio::select! {
msg = receiver.next() => {
if let Some(msg) = msg {
match msg {
// We've received a message from the client
// Ping/Pong is automatically handled by the WebSocket library
Ok(msg) => match msg {
Message::Text(_) => {
tasks.spawn(Connection::handle_msg(rpc.clone(), msg, internal_sender.clone()));
}
Message::Binary(_) => {
tasks.spawn(Connection::handle_msg(rpc.clone(), msg, internal_sender.clone()));
}
Message::Close(_) => {
// Respond with a close message
if let Err(err) = internal_sender.send(Message::Close(None)).await {
trace!("WebSocket error when replying to the Close frame: {:?}", err);
};
// Start the graceful shutdown of the WebSocket and close the channels
rpc.read().await.graceful_shutdown.cancel();
let _ = internal_sender.close();
break;
}
_ => {
// Ignore everything else
}
},
Err(err) => {
trace!("WebSocket error: {:?}", err);
// Start the graceful shutdown of the WebSocket and close the channels
rpc.read().await.graceful_shutdown.cancel();
let _ = internal_sender.close();
// Exit out of the loop
break;
}
}
}
}
_ = is_shutdown => break,
}
}
// Wait for all tasks to finish
while let Some(res) = tasks.join_next().await {
if let Err(err) = res {
error!("Error while handling RPC message: {}", err);
}
}
}
/// Write messages to the client
async fn write(
rpc: Arc<RwLock<Connection>>,
mut sender: SplitSink<WebSocket, Message>,
mut internal_receiver: Receiver<Message>,
) {
let cancel_token = rpc.read().await.graceful_shutdown.clone();
loop {
let is_shutdown = cancel_token.cancelled();
tokio::select! {
// Wait for the next message to send
msg = internal_receiver.next() => {
if let Some(res) = msg {
// Send the message to the client
if let Err(err) = sender.send(res).await {
if err.to_string() != CONN_CLOSED_ERR {
debug!("WebSocket error: {:?}", err);
}
// Close the WebSocket connection
rpc.read().await.graceful_shutdown.cancel();
// Exit out of the loop
break;
}
}
},
_ = is_shutdown => break,
}
}
}
/// Send live query notifications to the client
async fn lq_notifications(rpc: Arc<RwLock<Connection>>) {
if let Some(channel) = DB.get().unwrap().notifications() {
let cancel_token = rpc.read().await.graceful_shutdown.clone();
loop {
tokio::select! {
msg = channel.recv() => {
if let Ok(notification) = msg {
// Find which WebSocket the notification belongs to
if let Some(ws_id) = LIVE_QUERIES.read().await.get(&notification.id) {
// Check to see if the WebSocket exists
if let Some(WebSocketRef(ws, _)) = WEBSOCKETS.read().await.get(ws_id) {
// Serialize the message to send
let message = success(None, notification);
// Get the current output format
let format = rpc.read().await.processor.format.clone();
// Send the notification to the client
message.send(format, ws.clone()).await
}
}
}
},
_ = cancel_token.cancelled() => break,
}
}
}
}
/// Handle individual WebSocket messages
async fn handle_msg(rpc: Arc<RwLock<Connection>>, msg: Message, chn: Sender<Message>) {
// Get the current output format
let mut out_fmt = rpc.read().await.processor.format.clone();
// Prepare Span and Otel context
let span = span_for_request(&rpc.read().await.ws_id);
let _enter = span.enter();
let req_cx = RequestContext::default();
let otel_cx = TelemetryContext::current_with_value(req_cx.clone());
// Parse the request
match parse_request(msg).await {
Ok(req) => {
if let Some(_out_fmt) = req.out_fmt {
out_fmt = _out_fmt;
}
// Now that we know the method, we can update the span and create otel context
span.record("rpc.method", &req.method);
span.record("otel.name", format!("surrealdb.rpc/{}", req.method));
span.record(
"rpc.jsonrpc.request_id",
req.id.clone().map(|v| v.as_string()).unwrap_or(String::new()),
);
let otel_cx = TelemetryContext::current_with_value(
req_cx.with_method(&req.method).with_size(req.size),
);
// Process the request
let res =
rpc.write().await.processor.process_request(&req.method, req.params).await;
// Process the response
res.into_response(req.id).send(out_fmt, chn).with_context(otel_cx).await
}
Err(err) => {
// Process the response
failure(None, err).send(out_fmt, chn).with_context(otel_cx.clone()).await
}
}
}
}

43
src/rpc/mod.rs
View file

@ -1,5 +1,44 @@
pub mod args;
pub mod paths;
pub mod connection;
pub mod processor;
pub mod request;
pub mod res;
pub(crate) static CONN_CLOSED_ERR: &str = "Connection closed normally";
use std::{collections::HashMap, time::Duration};
use axum::extract::ws::Message;
use once_cell::sync::Lazy;
use surrealdb::channel::Sender;
use tokio::sync::RwLock;
use tokio_util::sync::CancellationToken;
use uuid::Uuid;
static CONN_CLOSED_ERR: &str = "Connection closed normally";
// Mapping of WebSocketID to WebSocket
pub struct WebSocketRef(Sender<Message>, CancellationToken);
type WebSockets = RwLock<HashMap<Uuid, WebSocketRef>>;
// Mapping of LiveQueryID to WebSocketID
type LiveQueries = RwLock<HashMap<Uuid, Uuid>>;
pub(crate) static WEBSOCKETS: Lazy<WebSockets> = Lazy::new(WebSockets::default);
pub(crate) static LIVE_QUERIES: Lazy<LiveQueries> = Lazy::new(LiveQueries::default);
pub(crate) async fn graceful_shutdown() {
// Close all WebSocket connections. Queued messages will still be processed.
for (_, WebSocketRef(_, cancel_token)) in WEBSOCKETS.read().await.iter() {
cancel_token.cancel();
}
// Wait for all existing WebSocket connections to gracefully close
while WEBSOCKETS.read().await.len() > 0 {
tokio::time::sleep(Duration::from_millis(100)).await;
}
}
pub(crate) fn shutdown() {
// Close all WebSocket connections immediately
if let Ok(mut writer) = WEBSOCKETS.try_write() {
writer.drain();
}
}

8
src/rpc/paths.rs
View file

@ -1,8 +0,0 @@
use once_cell::sync::Lazy;
use surrealdb::sql::Part;
pub static ID: Lazy<[Part; 1]> = Lazy::new(|| [Part::from("id")]);
pub static METHOD: Lazy<[Part; 1]> = Lazy::new(|| [Part::from("method")]);
pub static PARAMS: Lazy<[Part; 1]> = Lazy::new(|| [Part::from("params")]);

547
src/rpc/processor.rs Normal file
View file

@ -0,0 +1,547 @@
use crate::cnf::PKG_NAME;
use crate::cnf::PKG_VERSION;
use crate::dbs::DB;
use crate::err::Error;
use crate::rpc::args::Take;
use crate::rpc::LIVE_QUERIES;
use std::collections::BTreeMap;
use surrealdb::dbs::QueryType;
use surrealdb::dbs::Response;
use surrealdb::sql::Object;
use surrealdb::sql::Strand;
use surrealdb::sql::Value;
use surrealdb::{dbs::Session, sql::Array};
use uuid::Uuid;
use super::res::{Data, Failure, OutputFormat};
pub struct Processor {
pub ws_id: Uuid,
session: Session,
pub format: OutputFormat,
vars: BTreeMap<String, Value>,
}
impl Processor {
pub fn new(session: Session, format: OutputFormat, vars: BTreeMap<String, Value>) -> Self {
Self {
ws_id: Uuid::new_v4(),
session,
format,
vars,
}
}
pub async fn process_request(&mut self, method: &str, params: Array) -> Result<Data, Failure> {
info!("Process RPC request");
// Match the method to a function
match method {
// Handle a surrealdb ping message
//
// This is used to keep the WebSocket connection alive in environments where the WebSocket protocol is not enough.
// For example, some browsers will wait for the TCP protocol to timeout before triggering an on_close event. This may take several seconds or even minutes in certain scenarios.
// By sending a ping message every few seconds from the client, we can force a connection check and trigger a an on_close event if the ping can't be sent.
//
"ping" => Ok(Value::None.into()),
// Retrieve the current auth record
"info" => match params.len() {
0 => self.info().await.map(Into::into).map_err(Into::into),
_ => Err(Failure::INVALID_PARAMS),
},
// Switch to a specific namespace and database
"use" => match params.needs_two() {
Ok((ns, db)) => self.yuse(ns, db).await.map(Into::into).map_err(Into::into),
_ => Err(Failure::INVALID_PARAMS),
},
// Signup to a specific authentication scope
"signup" => match params.needs_one() {
Ok(Value::Object(v)) => self.signup(v).await.map(Into::into).map_err(Into::into),
_ => Err(Failure::INVALID_PARAMS),
},
// Signin as a root, namespace, database or scope user
"signin" => match params.needs_one() {
Ok(Value::Object(v)) => self.signin(v).await.map(Into::into).map_err(Into::into),
_ => Err(Failure::INVALID_PARAMS),
},
// Invalidate the current authentication session
"invalidate" => match params.len() {
0 => self.invalidate().await.map(Into::into).map_err(Into::into),
_ => Err(Failure::INVALID_PARAMS),
},
// Authenticate using an authentication token
"authenticate" => match params.needs_one() {
Ok(Value::Strand(v)) => {
self.authenticate(v).await.map(Into::into).map_err(Into::into)
}
_ => Err(Failure::INVALID_PARAMS),
},
// Kill a live query using a query id
"kill" => match params.needs_one() {
Ok(v) => self.kill(v).await.map(Into::into).map_err(Into::into),
_ => Err(Failure::INVALID_PARAMS),
},
// Setup a live query on a specific table
"live" => match params.needs_one_or_two() {
Ok((v, d)) if v.is_table() => {
self.live(v, d).await.map(Into::into).map_err(Into::into)
}
Ok((v, d)) if v.is_strand() => {
self.live(v, d).await.map(Into::into).map_err(Into::into)
}
_ => Err(Failure::INVALID_PARAMS),
},
// Specify a connection-wide parameter
"let" | "set" => match params.needs_one_or_two() {
Ok((Value::Strand(s), v)) => {
self.set(s, v).await.map(Into::into).map_err(Into::into)
}
_ => Err(Failure::INVALID_PARAMS),
},
// Unset and clear a connection-wide parameter
"unset" => match params.needs_one() {
Ok(Value::Strand(s)) => self.unset(s).await.map(Into::into).map_err(Into::into),
_ => Err(Failure::INVALID_PARAMS),
},
// Select a value or values from the database
"select" => match params.needs_one() {
Ok(v) => self.select(v).await.map(Into::into).map_err(Into::into),
_ => Err(Failure::INVALID_PARAMS),
},
// Insert a value or values in the database
"insert" => match params.needs_one_or_two() {
Ok((v, o)) => self.insert(v, o).await.map(Into::into).map_err(Into::into),
_ => Err(Failure::INVALID_PARAMS),
},
// Create a value or values in the database
"create" => match params.needs_one_or_two() {
Ok((v, o)) => self.create(v, o).await.map(Into::into).map_err(Into::into),
_ => Err(Failure::INVALID_PARAMS),
},
// Update a value or values in the database using `CONTENT`
"update" => match params.needs_one_or_two() {
Ok((v, o)) => self.update(v, o).await.map(Into::into).map_err(Into::into),
_ => Err(Failure::INVALID_PARAMS),
},
// Update a value or values in the database using `MERGE`
"change" | "merge" => match params.needs_one_or_two() {
Ok((v, o)) => self.change(v, o).await.map(Into::into).map_err(Into::into),
_ => Err(Failure::INVALID_PARAMS),
},
// Update a value or values in the database using `PATCH`
"modify" | "patch" => match params.needs_one_or_two() {
Ok((v, o)) => self.modify(v, o).await.map(Into::into).map_err(Into::into),
_ => Err(Failure::INVALID_PARAMS),
},
// Delete a value or values from the database
"delete" => match params.needs_one() {
Ok(v) => self.delete(v).await.map(Into::into).map_err(Into::into),
_ => Err(Failure::INVALID_PARAMS),
},
// Specify the output format for text requests
"format" => match params.needs_one() {
Ok(Value::Strand(v)) => self.format(v).await.map(Into::into).map_err(Into::into),
_ => Err(Failure::INVALID_PARAMS),
},
// Get the current server version
"version" => match params.len() {
0 => Ok(format!("{PKG_NAME}-{}", *PKG_VERSION).into()),
_ => Err(Failure::INVALID_PARAMS),
},
// Run a full SurrealQL query against the database
"query" => match params.needs_one_or_two() {
Ok((Value::Strand(s), o)) if o.is_none_or_null() => {
self.query(s).await.map(Into::into).map_err(Into::into)
}
Ok((Value::Strand(s), Value::Object(o))) => {
self.query_with(s, o).await.map(Into::into).map_err(Into::into)
}
_ => Err(Failure::INVALID_PARAMS),
},
_ => Err(Failure::METHOD_NOT_FOUND),
}
}
// ------------------------------
// Methods for authentication
// ------------------------------
async fn format(&mut self, out: Strand) -> Result<Value, Error> {
match out.as_str() {
"json" | "application/json" => self.format = OutputFormat::Json,
"cbor" | "application/cbor" => self.format = OutputFormat::Cbor,
"pack" | "application/pack" => self.format = OutputFormat::Pack,
_ => return Err(Error::InvalidType),
};
Ok(Value::None)
}
async fn yuse(&mut self, ns: Value, db: Value) -> Result<Value, Error> {
if let Value::Strand(ns) = ns {
self.session.ns = Some(ns.0);
}
if let Value::Strand(db) = db {
self.session.db = Some(db.0);
}
Ok(Value::None)
}
async fn signup(&mut self, vars: Object) -> Result<Value, Error> {
let kvs = DB.get().unwrap();
surrealdb::iam::signup::signup(kvs, &mut self.session, vars)
.await
.map(Into::into)
.map_err(Into::into)
}
async fn signin(&mut self, vars: Object) -> Result<Value, Error> {
let kvs = DB.get().unwrap();
surrealdb::iam::signin::signin(kvs, &mut self.session, vars)
.await
.map(Into::into)
.map_err(Into::into)
}
async fn invalidate(&mut self) -> Result<Value, Error> {
surrealdb::iam::clear::clear(&mut self.session)?;
Ok(Value::None)
}
async fn authenticate(&mut self, token: Strand) -> Result<Value, Error> {
let kvs = DB.get().unwrap();
surrealdb::iam::verify::token(kvs, &mut self.session, &token.0).await?;
Ok(Value::None)
}
// ------------------------------
// Methods for identification
// ------------------------------
async fn info(&self) -> Result<Value, Error> {
// Get a database reference
let kvs = DB.get().unwrap();
// Specify the SQL query string
let sql = "SELECT * FROM $auth";
// Execute the query on the database
let mut res = kvs.execute(sql, &self.session, None).await?;
// Extract the first value from the result
let res = res.remove(0).result?.first();
// Return the result to the client
Ok(res)
}
// ------------------------------
// Methods for setting variables
// ------------------------------
async fn set(&mut self, key: Strand, val: Value) -> Result<Value, Error> {
match val {
// Remove the variable if undefined
Value::None => self.vars.remove(&key.0),
// Store the variable if defined
v => self.vars.insert(key.0, v),
};
Ok(Value::Null)
}
async fn unset(&mut self, key: Strand) -> Result<Value, Error> {
self.vars.remove(&key.0);
Ok(Value::Null)
}
// ------------------------------
// Methods for live queries
// ------------------------------
async fn kill(&self, id: Value) -> Result<Value, Error> {
// Specify the SQL query string
let sql = "KILL $id";
// Specify the query parameters
let var = map! {
String::from("id") => id, // NOTE: id can be parameter
=> &self.vars
};
// Execute the query on the database
let mut res = self.query_with(Strand::from(sql), Object::from(var)).await?;
// Extract the first query result
let response = res.remove(0);
match response.result {
Ok(v) => Ok(v),
Err(e) => Err(Error::from(e)),
}
}
async fn live(&self, tb: Value, diff: Value) -> Result<Value, Error> {
// Specify the SQL query string
let sql = match diff.is_true() {
true => "LIVE SELECT DIFF FROM $tb",
false => "LIVE SELECT * FROM $tb",
};
// Specify the query parameters
let var = map! {
String::from("tb") => tb.could_be_table(),
=> &self.vars
};
// Execute the query on the database
let mut res = self.query_with(Strand::from(sql), Object::from(var)).await?;
// Extract the first query result
let response = res.remove(0);
match response.result {
Ok(v) => Ok(v),
Err(e) => Err(Error::from(e)),
}
}
// ------------------------------
// Methods for selecting
// ------------------------------
async fn select(&self, what: Value) -> Result<Value, Error> {
// Return a single result?
let one = what.is_thing();
// Get a database reference
let kvs = DB.get().unwrap();
// Specify the SQL query string
let sql = "SELECT * FROM $what";
// Specify the query parameters
let var = Some(map! {
String::from("what") => what.could_be_table(),
=> &self.vars
});
// Execute the query on the database
let mut res = kvs.execute(sql, &self.session, var).await?;
// Extract the first query result
let res = match one {
true => res.remove(0).result?.first(),
false => res.remove(0).result?,
};
// Return the result to the client
Ok(res)
}
// ------------------------------
// Methods for inserting
// ------------------------------
async fn insert(&self, what: Value, data: Value) -> Result<Value, Error> {
// Return a single result?
let one = what.is_thing();
// Get a database reference
let kvs = DB.get().unwrap();
// Specify the SQL query string
let sql = "INSERT INTO $what $data RETURN AFTER";
// Specify the query parameters
let var = Some(map! {
String::from("what") => what.could_be_table(),
String::from("data") => data,
=> &self.vars
});
// Execute the query on the database
let mut res = kvs.execute(sql, &self.session, var).await?;
// Extract the first query result
let res = match one {
true => res.remove(0).result?.first(),
false => res.remove(0).result?,
};
// Return the result to the client
Ok(res)
}
// ------------------------------
// Methods for creating
// ------------------------------
async fn create(&self, what: Value, data: Value) -> Result<Value, Error> {
// Return a single result?
let one = what.is_thing();
// Get a database reference
let kvs = DB.get().unwrap();
// Specify the SQL query string
let sql = "CREATE $what CONTENT $data RETURN AFTER";
// Specify the query parameters
let var = Some(map! {
String::from("what") => what.could_be_table(),
String::from("data") => data,
=> &self.vars
});
// Execute the query on the database
let mut res = kvs.execute(sql, &self.session, var).await?;
// Extract the first query result
let res = match one {
true => res.remove(0).result?.first(),
false => res.remove(0).result?,
};
// Return the result to the client
Ok(res)
}
// ------------------------------
// Methods for updating
// ------------------------------
async fn update(&self, what: Value, data: Value) -> Result<Value, Error> {
// Return a single result?
let one = what.is_thing();
// Get a database reference
let kvs = DB.get().unwrap();
// Specify the SQL query string
let sql = "UPDATE $what CONTENT $data RETURN AFTER";
// Specify the query parameters
let var = Some(map! {
String::from("what") => what.could_be_table(),
String::from("data") => data,
=> &self.vars
});
// Execute the query on the database
let mut res = kvs.execute(sql, &self.session, var).await?;
// Extract the first query result
let res = match one {
true => res.remove(0).result?.first(),
false => res.remove(0).result?,
};
// Return the result to the client
Ok(res)
}
// ------------------------------
// Methods for changing
// ------------------------------
async fn change(&self, what: Value, data: Value) -> Result<Value, Error> {
// Return a single result?
let one = what.is_thing();
// Get a database reference
let kvs = DB.get().unwrap();
// Specify the SQL query string
let sql = "UPDATE $what MERGE $data RETURN AFTER";
// Specify the query parameters
let var = Some(map! {
String::from("what") => what.could_be_table(),
String::from("data") => data,
=> &self.vars
});
// Execute the query on the database
let mut res = kvs.execute(sql, &self.session, var).await?;
// Extract the first query result
let res = match one {
true => res.remove(0).result?.first(),
false => res.remove(0).result?,
};
// Return the result to the client
Ok(res)
}
// ------------------------------
// Methods for modifying
// ------------------------------
async fn modify(&self, what: Value, data: Value) -> Result<Value, Error> {
// Return a single result?
let one = what.is_thing();
// Get a database reference
let kvs = DB.get().unwrap();
// Specify the SQL query string
let sql = "UPDATE $what PATCH $data RETURN DIFF";
// Specify the query parameters
let var = Some(map! {
String::from("what") => what.could_be_table(),
String::from("data") => data,
=> &self.vars
});
// Execute the query on the database
let mut res = kvs.execute(sql, &self.session, var).await?;
// Extract the first query result
let res = match one {
true => res.remove(0).result?.first(),
false => res.remove(0).result?,
};
// Return the result to the client
Ok(res)
}
// ------------------------------
// Methods for deleting
// ------------------------------
async fn delete(&self, what: Value) -> Result<Value, Error> {
// Return a single result?
let one = what.is_thing();
// Get a database reference
let kvs = DB.get().unwrap();
// Specify the SQL query string
let sql = "DELETE $what RETURN BEFORE";
// Specify the query parameters
let var = Some(map! {
String::from("what") => what.could_be_table(),
=> &self.vars
});
// Execute the query on the database
let mut res = kvs.execute(sql, &self.session, var).await?;
// Extract the first query result
let res = match one {
true => res.remove(0).result?.first(),
false => res.remove(0).result?,
};
// Return the result to the client
Ok(res)
}
// ------------------------------
// Methods for querying
// ------------------------------
async fn query(&self, sql: Strand) -> Result<Vec<Response>, Error> {
// Get a database reference
let kvs = DB.get().unwrap();
// Specify the query parameters
let var = Some(self.vars.clone());
// Execute the query on the database
let res = kvs.execute(&sql, &self.session, var).await?;
// Post-process hooks for web layer
for response in &res {
self.handle_live_query_results(response).await;
}
// Return the result to the client
Ok(res)
}
async fn query_with(&self, sql: Strand, mut vars: Object) -> Result<Vec<Response>, Error> {
// Get a database reference
let kvs = DB.get().unwrap();
// Specify the query parameters
let var = Some(mrg! { vars.0, &self.vars });
// Execute the query on the database
let res = kvs.execute(&sql, &self.session, var).await?;
// Post-process hooks for web layer
for response in &res {
self.handle_live_query_results(response).await;
}
// Return the result to the client
Ok(res)
}
// ------------------------------
// Private methods
// ------------------------------
async fn handle_live_query_results(&self, res: &Response) {
match &res.query_type {
QueryType::Live => {
if let Ok(Value::Uuid(lqid)) = &res.result {
// Match on Uuid type
LIVE_QUERIES.write().await.insert(lqid.0, self.ws_id);
trace!("Registered live query {} on websocket {}", lqid, self.ws_id);
}
}
QueryType::Kill => {
if let Ok(Value::Uuid(lqid)) = &res.result {
let ws_id = LIVE_QUERIES.write().await.remove(&lqid.0);
if let Some(ws_id) = ws_id {
trace!("Unregistered live query {} on websocket {}", lqid, ws_id);
}
}
}
_ => {}
}
}
}

84
src/rpc/request.rs Normal file
View file

@ -0,0 +1,84 @@
use axum::extract::ws::Message;
use surrealdb::sql::{serde::deserialize, Array, Value};
use once_cell::sync::Lazy;
use surrealdb::sql::Part;
use super::res::{Failure, OutputFormat};
pub static ID: Lazy<[Part; 1]> = Lazy::new(|| [Part::from("id")]);
pub static METHOD: Lazy<[Part; 1]> = Lazy::new(|| [Part::from("method")]);
pub static PARAMS: Lazy<[Part; 1]> = Lazy::new(|| [Part::from("params")]);
pub struct Request {
pub id: Option<Value>,
pub method: String,
pub params: Array,
pub size: usize,
pub out_fmt: Option<OutputFormat>,
}
/// Parse the RPC request
pub async fn parse_request(msg: Message) -> Result<Request, Failure> {
let mut out_fmt = None;
let (req, size) = match msg {
// This is a binary message
Message::Binary(val) => {
// Use binary output
out_fmt = Some(OutputFormat::Full);
match deserialize(&val) {
Ok(v) => (v, val.len()),
Err(_) => {
debug!("Error when trying to deserialize the request");
return Err(Failure::PARSE_ERROR);
}
}
}
// This is a text message
Message::Text(ref val) => {
// Parse the SurrealQL object
match surrealdb::sql::value(val) {
// The SurrealQL message parsed ok
Ok(v) => (v, val.len()),
// The SurrealQL message failed to parse
_ => return Err(Failure::PARSE_ERROR),
}
}
// Unsupported message type
_ => {
debug!("Unsupported message type: {:?}", msg);
return Err(Failure::custom("Unsupported message type"));
}
};
// Fetch the 'id' argument
let id = match req.pick(&*ID) {
v if v.is_none() => None,
v if v.is_null() => Some(v),
v if v.is_uuid() => Some(v),
v if v.is_number() => Some(v),
v if v.is_strand() => Some(v),
v if v.is_datetime() => Some(v),
_ => return Err(Failure::INVALID_REQUEST),
};
// Fetch the 'method' argument
let method = match req.pick(&*METHOD) {
Value::Strand(v) => v.to_raw(),
_ => return Err(Failure::INVALID_REQUEST),
};
// Fetch the 'params' argument
let params = match req.pick(&*PARAMS) {
Value::Array(v) => v,
_ => Array::new(),
};
Ok(Request {
id,
method,
params,
size,
out_fmt,
})
}

16
src/rpc/res.rs
View file

@ -1,4 +1,5 @@
use axum::extract::ws::Message;
use opentelemetry::Context as TelemetryContext;
use serde::Serialize;
use serde_json::{json, Value as Json};
use std::borrow::Cow;
@ -11,6 +12,7 @@ use tracing::Span;
use crate::err;
use crate::rpc::CONN_CLOSED_ERR;
use crate::telemetry::metrics::ws::record_rpc;
#[derive(Debug, Clone)]
pub enum OutputFormat {
@ -96,6 +98,7 @@ impl Response {
info!("Process RPC response");
let is_error = self.result.is_err();
if let Err(err) = &self.result {
span.record("otel.status_code", "Error");
span.record(
@ -106,30 +109,33 @@ impl Response {
span.record("rpc.jsonrpc.error_message", err.message.as_ref());
}
let message = match out {
let (res_size, message) = match out {
OutputFormat::Json => {
let res = serde_json::to_string(&self.simplify()).unwrap();
Message::Text(res)
(res.len(), Message::Text(res))
}
OutputFormat::Cbor => {
let res = serde_cbor::to_vec(&self.simplify()).unwrap();
Message::Binary(res)
(res.len(), Message::Binary(res))
}
OutputFormat::Pack => {
let res = serde_pack::to_vec(&self.simplify()).unwrap();
Message::Binary(res)
(res.len(), Message::Binary(res))
}
OutputFormat::Full => {
let res = surrealdb::sql::serde::serialize(&self).unwrap();
Message::Binary(res)
(res.len(), Message::Binary(res))
}
};
if let Err(err) = chn.send(message).await {
if err.to_string() != CONN_CLOSED_ERR {
error!("Error sending response: {}", err);
return;
}
};
record_rpc(&TelemetryContext::current(), res_size, is_error);
}
}

128
src/telemetry/metrics/http/mod.rs
View file

@ -1,87 +1,15 @@
pub(super) mod tower_layer;
use once_cell::sync::Lazy;
use opentelemetry::{
metrics::{Histogram, Meter, MeterProvider, ObservableUpDownCounter, Unit},
runtime,
sdk::{
export::metrics::aggregation,
metrics::{
controllers::{self, BasicController},
processors, selectors,
},
},
Context,
};
use opentelemetry_otlp::MetricsExporterBuilder;
use opentelemetry::metrics::{Histogram, MetricsError, ObservableUpDownCounter, Unit};
use opentelemetry::Context as TelemetryContext;
use crate::telemetry::OTEL_DEFAULT_RESOURCE;
use self::tower_layer::HttpCallMetricTracker;
// Histogram buckets in milliseconds
static HTTP_DURATION_MS_HISTOGRAM_BUCKETS: &[f64] = &[
5.0, 10.0, 20.0, 50.0, 75.0, 100.0, 150.0, 200.0, 250.0, 300.0, 500.0, 750.0, 1000.0, 1500.0,
2000.0, 2500.0, 5000.0, 10000.0, 15000.0, 30000.0,
];
const KB: f64 = 1024.0;
const MB: f64 = 1024.0 * KB;
const HTTP_SIZE_HISTOGRAM_BUCKETS: &[f64] = &[
1.0 * KB, // 1 KB
2.0 * KB, // 2 KB
5.0 * KB, // 5 KB
10.0 * KB, // 10 KB
100.0 * KB, // 100 KB
500.0 * KB, // 500 KB
1.0 * MB, // 1 MB
2.5 * MB, // 2 MB
5.0 * MB, // 5 MB
10.0 * MB, // 10 MB
25.0 * MB, // 25 MB
50.0 * MB, // 50 MB
100.0 * MB, // 100 MB
];
static METER_PROVIDER_HTTP_DURATION: Lazy<BasicController> = Lazy::new(|| {
let exporter = MetricsExporterBuilder::from(opentelemetry_otlp::new_exporter().tonic())
.build_metrics_exporter(Box::new(aggregation::cumulative_temporality_selector()))
.unwrap();
let builder = controllers::basic(processors::factory(
selectors::simple::histogram(HTTP_DURATION_MS_HISTOGRAM_BUCKETS),
aggregation::cumulative_temporality_selector(),
))
.with_exporter(exporter)
.with_resource(OTEL_DEFAULT_RESOURCE.clone());
let controller = builder.build();
controller.start(&Context::current(), runtime::Tokio).unwrap();
controller
});
static METER_PROVIDER_HTTP_SIZE: Lazy<BasicController> = Lazy::new(|| {
let exporter = MetricsExporterBuilder::from(opentelemetry_otlp::new_exporter().tonic())
.build_metrics_exporter(Box::new(aggregation::cumulative_temporality_selector()))
.unwrap();
let builder = controllers::basic(processors::factory(
selectors::simple::histogram(HTTP_SIZE_HISTOGRAM_BUCKETS),
aggregation::cumulative_temporality_selector(),
))
.with_exporter(exporter)
.with_resource(OTEL_DEFAULT_RESOURCE.clone());
let controller = builder.build();
controller.start(&Context::current(), runtime::Tokio).unwrap();
controller
});
static HTTP_DURATION_METER: Lazy<Meter> =
Lazy::new(|| METER_PROVIDER_HTTP_DURATION.meter("http_duration"));
static HTTP_SIZE_METER: Lazy<Meter> = Lazy::new(|| METER_PROVIDER_HTTP_SIZE.meter("http_size"));
use super::{METER_DURATION, METER_SIZE};
pub static HTTP_SERVER_DURATION: Lazy<Histogram<u64>> = Lazy::new(|| {
HTTP_DURATION_METER
METER_DURATION
.u64_histogram("http.server.duration")
.with_description("The HTTP server duration in milliseconds.")
.with_unit(Unit::new("ms"))
@ -89,14 +17,14 @@ pub static HTTP_SERVER_DURATION: Lazy<Histogram<u64>> = Lazy::new(|| {
});
pub static HTTP_SERVER_ACTIVE_REQUESTS: Lazy<ObservableUpDownCounter<i64>> = Lazy::new(|| {
HTTP_DURATION_METER
METER_DURATION
.i64_observable_up_down_counter("http.server.active_requests")
.with_description("The number of active HTTP requests.")
.init()
});
pub static HTTP_SERVER_REQUEST_SIZE: Lazy<Histogram<u64>> = Lazy::new(|| {
HTTP_SIZE_METER
METER_SIZE
.u64_histogram("http.server.request.size")
.with_description("Measures the size of HTTP request messages.")
.with_unit(Unit::new("mb"))
@ -104,9 +32,49 @@ pub static HTTP_SERVER_REQUEST_SIZE: Lazy<Histogram<u64>> = Lazy::new(|| {
});
pub static HTTP_SERVER_RESPONSE_SIZE: Lazy<Histogram<u64>> = Lazy::new(|| {
HTTP_SIZE_METER
METER_SIZE
.u64_histogram("http.server.response.size")
.with_description("Measures the size of HTTP response messages.")
.with_unit(Unit::new("mb"))
.init()
});
fn observe_request_start(tracker: &HttpCallMetricTracker) -> Result<(), MetricsError> {
observe_active_request(1, tracker)
}
fn observe_request_finish(tracker: &HttpCallMetricTracker) -> Result<(), MetricsError> {
observe_active_request(-1, tracker)
}
fn observe_active_request(value: i64, tracker: &HttpCallMetricTracker) -> Result<(), MetricsError> {
let attrs = tracker.active_req_attrs();
METER_DURATION
.register_callback(move |ctx| HTTP_SERVER_ACTIVE_REQUESTS.observe(ctx, value, &attrs))
}
fn record_request_duration(tracker: &HttpCallMetricTracker) {
// Record the duration of the request.
HTTP_SERVER_DURATION.record(
&TelemetryContext::current(),
tracker.duration().as_millis() as u64,
&tracker.request_duration_attrs(),
);
}
fn record_request_size(tracker: &HttpCallMetricTracker, size: u64) {
HTTP_SERVER_REQUEST_SIZE.record(
&TelemetryContext::current(),
size,
&tracker.request_size_attrs(),
);
}
fn record_response_size(tracker: &HttpCallMetricTracker, size: u64) {
HTTP_SERVER_RESPONSE_SIZE.record(
&TelemetryContext::current(),
size,
&tracker.response_size_attrs(),
);
}

62
src/telemetry/metrics/http/tower_layer.rs
View file

@ -1,5 +1,5 @@
use axum::extract::MatchedPath;
use opentelemetry::{metrics::MetricsError, Context as TelemetryContext, KeyValue};
use opentelemetry::{metrics::MetricsError, KeyValue};
use pin_project_lite::pin_project;
use std::{
cell::Cell,
@ -13,11 +13,6 @@ use futures::Future;
use http::{Request, Response, StatusCode, Version};
use tower::{Layer, Service};
use super::{
HTTP_DURATION_METER, HTTP_SERVER_ACTIVE_REQUESTS, HTTP_SERVER_DURATION,
HTTP_SERVER_REQUEST_SIZE, HTTP_SERVER_RESPONSE_SIZE,
};
#[derive(Clone, Default)]
pub struct HttpMetricsLayer;
@ -168,7 +163,7 @@ impl HttpCallMetricTracker {
}
// Follows the OpenTelemetry semantic conventions for HTTP metrics define here: https://github.com/open-telemetry/opentelemetry-specification/blob/v1.23.0/specification/metrics/semantic_conventions/http-metrics.md
fn olel_common_attrs(&self) -> Vec<KeyValue> {
fn otel_common_attrs(&self) -> Vec<KeyValue> {
let mut res = vec![
KeyValue::new("http.request.method", self.method.as_str().to_owned()),
KeyValue::new("network.protocol.name", "http".to_owned()),
@ -186,11 +181,11 @@ impl HttpCallMetricTracker {
}
pub(super) fn active_req_attrs(&self) -> Vec<KeyValue> {
self.olel_common_attrs()
self.otel_common_attrs()
}
pub(super) fn request_duration_attrs(&self) -> Vec<KeyValue> {
let mut res = self.olel_common_attrs();
let mut res = self.otel_common_attrs();
res.push(KeyValue::new(
"http.response.status_code",
@ -247,64 +242,25 @@ impl Drop for HttpCallMetricTracker {
pub fn on_request_start(tracker: &HttpCallMetricTracker) -> Result<(), MetricsError> {
// Setup the active_requests observer
observe_active_request_start(tracker)
super::observe_request_start(tracker)
}
pub fn on_request_finish(tracker: &HttpCallMetricTracker) -> Result<(), MetricsError> {
// Setup the active_requests observer
observe_active_request_finish(tracker)?;
super::observe_request_finish(tracker)?;
// Record the duration of the request.
record_request_duration(tracker);
super::record_request_duration(tracker);
// Record the request size if known
if let Some(size) = tracker.request_size {
record_request_size(tracker, size)
super::record_request_size(tracker, size)
}
// Record the response size if known
if let Some(size) = tracker.response_size {
record_response_size(tracker, size)
super::record_response_size(tracker, size)
}
Ok(())
}
fn observe_active_request_start(tracker: &HttpCallMetricTracker) -> Result<(), MetricsError> {
let attrs = tracker.active_req_attrs();
// Setup the callback to observe the active requests.
HTTP_DURATION_METER
.register_callback(move |ctx| HTTP_SERVER_ACTIVE_REQUESTS.observe(ctx, 1, &attrs))
}
fn observe_active_request_finish(tracker: &HttpCallMetricTracker) -> Result<(), MetricsError> {
let attrs = tracker.active_req_attrs();
// Setup the callback to observe the active requests.
HTTP_DURATION_METER
.register_callback(move |ctx| HTTP_SERVER_ACTIVE_REQUESTS.observe(ctx, -1, &attrs))
}
fn record_request_duration(tracker: &HttpCallMetricTracker) {
// Record the duration of the request.
HTTP_SERVER_DURATION.record(
&TelemetryContext::current(),
tracker.duration().as_millis() as u64,
&tracker.request_duration_attrs(),
);
}
pub fn record_request_size(tracker: &HttpCallMetricTracker, size: u64) {
HTTP_SERVER_REQUEST_SIZE.record(
&TelemetryContext::current(),
size,
&tracker.request_size_attrs(),
);
}
pub fn record_response_size(tracker: &HttpCallMetricTracker, size: u64) {
HTTP_SERVER_RESPONSE_SIZE.record(
&TelemetryContext::current(),
size,
&tracker.response_size_attrs(),
);
}

94
src/telemetry/metrics/mod.rs
View file

@ -1,3 +1,97 @@
pub mod http;
pub mod ws;
use std::time::Duration;
use once_cell::sync::Lazy;
use opentelemetry::Context as TelemetryContext;
use opentelemetry::{
metrics::{Meter, MeterProvider, MetricsError},
runtime,
sdk::{
export::metrics::aggregation,
metrics::{
controllers::{self, BasicController},
processors, selectors,
},
},
};
use opentelemetry_otlp::MetricsExporterBuilder;
pub use self::http::tower_layer::HttpMetricsLayer;
use self::ws::observe_active_connection;
use super::OTEL_DEFAULT_RESOURCE;
// Histogram buckets in milliseconds
static HISTOGRAM_BUCKETS_MS: &[f64] = &[
5.0, 10.0, 20.0, 50.0, 75.0, 100.0, 150.0, 200.0, 250.0, 300.0, 500.0, 750.0, 1000.0, 1500.0,
2000.0, 2500.0, 5000.0, 10000.0, 15000.0, 30000.0,
];
// Histogram buckets in bytes
const KB: f64 = 1024.0;
const MB: f64 = 1024.0 * KB;
const HISTOGRAM_BUCKETS_BYTES: &[f64] = &[
1.0 * KB, // 1 KB
2.0 * KB, // 2 KB
5.0 * KB, // 5 KB
10.0 * KB, // 10 KB
100.0 * KB, // 100 KB
500.0 * KB, // 500 KB
1.0 * MB, // 1 MB
2.5 * MB, // 2 MB
5.0 * MB, // 5 MB
10.0 * MB, // 10 MB
25.0 * MB, // 25 MB
50.0 * MB, // 50 MB
100.0 * MB, // 100 MB
];
fn build_controller(boundaries: &'static [f64]) -> BasicController {
let exporter = MetricsExporterBuilder::from(opentelemetry_otlp::new_exporter().tonic())
.build_metrics_exporter(Box::new(aggregation::cumulative_temporality_selector()))
.unwrap();
let builder = controllers::basic(processors::factory(
selectors::simple::histogram(boundaries),
aggregation::cumulative_temporality_selector(),
))
.with_push_timeout(Duration::from_secs(5))
.with_collect_period(Duration::from_secs(5))
.with_exporter(exporter)
.with_resource(OTEL_DEFAULT_RESOURCE.clone());
builder.build()
}
static METER_PROVIDER_DURATION: Lazy<BasicController> =
Lazy::new(|| build_controller(HISTOGRAM_BUCKETS_MS));
static METER_PROVIDER_SIZE: Lazy<BasicController> =
Lazy::new(|| build_controller(HISTOGRAM_BUCKETS_BYTES));
static METER_DURATION: Lazy<Meter> = Lazy::new(|| METER_PROVIDER_DURATION.meter("duration"));
static METER_SIZE: Lazy<Meter> = Lazy::new(|| METER_PROVIDER_SIZE.meter("size"));
/// Initialize the metrics subsystem
pub fn init(cx: &TelemetryContext) -> Result<(), MetricsError> {
METER_PROVIDER_DURATION.start(cx, runtime::Tokio)?;
METER_PROVIDER_SIZE.start(cx, runtime::Tokio)?;
observe_active_connection(0)?;
Ok(())
}
//
// Shutdown the metrics providers
//
pub fn shutdown(cx: &TelemetryContext) -> Result<(), MetricsError> {
METER_PROVIDER_DURATION.stop(cx)?;
METER_PROVIDER_DURATION.collect(cx)?;
METER_PROVIDER_SIZE.stop(cx)?;
METER_PROVIDER_SIZE.collect(cx)?;
Ok(())
}

126
src/telemetry/metrics/ws/mod.rs Normal file
View file

@ -0,0 +1,126 @@
use std::time::Instant;
use once_cell::sync::Lazy;
use opentelemetry::KeyValue;
use opentelemetry::{
metrics::{Histogram, MetricsError, ObservableUpDownCounter, Unit},
Context as TelemetryContext,
};
use super::{METER_DURATION, METER_SIZE};
pub static RPC_SERVER_DURATION: Lazy<Histogram<u64>> = Lazy::new(|| {
METER_DURATION
.u64_histogram("rpc.server.duration")
.with_description("Measures duration of inbound RPC requests in milliseconds.")
.with_unit(Unit::new("ms"))
.init()
});
pub static RPC_SERVER_ACTIVE_CONNECTIONS: Lazy<ObservableUpDownCounter<i64>> = Lazy::new(|| {
METER_DURATION
.i64_observable_up_down_counter("rpc.server.active_connections")
.with_description("The number of active WebSocket connections.")
.init()
});
pub static RPC_SERVER_REQUEST_SIZE: Lazy<Histogram<u64>> = Lazy::new(|| {
METER_SIZE
.u64_histogram("rpc.server.request.size")
.with_description("Measures the size of HTTP request messages.")
.with_unit(Unit::new("mb"))
.init()
});
pub static RPC_SERVER_RESPONSE_SIZE: Lazy<Histogram<u64>> = Lazy::new(|| {
METER_SIZE
.u64_histogram("rpc.server.response.size")
.with_description("Measures the size of HTTP response messages.")
.with_unit(Unit::new("mb"))
.init()
});
fn otel_common_attrs() -> Vec<KeyValue> {
vec![KeyValue::new("rpc.system", "jsonrpc"), KeyValue::new("rpc.service", "surrealdb")]
}
/// Registers the callback that increases the number of active RPC connections.
pub fn on_connect() -> Result<(), MetricsError> {
observe_active_connection(1)
}
/// Registers the callback that increases the number of active RPC connections.
pub fn on_disconnect() -> Result<(), MetricsError> {
observe_active_connection(-1)
}
pub(super) fn observe_active_connection(value: i64) -> Result<(), MetricsError> {
let attrs = otel_common_attrs();
METER_DURATION
.register_callback(move |cx| RPC_SERVER_ACTIVE_CONNECTIONS.observe(cx, value, &attrs))
}
//
// Record an RPC command
//
#[derive(Clone, Debug, PartialEq)]
pub struct RequestContext {
start: Instant,
pub method: String,
pub size: usize,
}
impl Default for RequestContext {
fn default() -> Self {
Self {
start: Instant::now(),
method: "unknown".to_string(),
size: 0,
}
}
}
impl RequestContext {
pub fn with_method(self, method: &str) -> Self {
Self {
method: method.to_string(),
..self
}
}
pub fn with_size(self, size: usize) -> Self {
Self {
size,
..self
}
}
}
/// Updates the request and response metrics for an RPC method.
pub fn record_rpc(cx: &TelemetryContext, res_size: usize, is_error: bool) {
let mut attrs = otel_common_attrs();
let mut duration = 0;
let mut req_size = 0;
if let Some(cx) = cx.get::<RequestContext>() {
attrs.extend_from_slice(&[
KeyValue::new("rpc.method", cx.method.clone()),
KeyValue::new("rpc.error", is_error),
]);
duration = cx.start.elapsed().as_millis() as u64;
req_size = cx.size as u64;
} else {
// If a bug causes the RequestContent to be empty, we still want to record the metrics to avoid a silent failure.
warn!("record_rpc: no request context found, resulting metrics will be invalid");
attrs.extend_from_slice(&[
KeyValue::new("rpc.method", "unknown"),
KeyValue::new("rpc.error", is_error),
]);
};
RPC_SERVER_DURATION.record(cx, duration, &attrs);
RPC_SERVER_REQUEST_SIZE.record(cx, req_size, &attrs);
RPC_SERVER_RESPONSE_SIZE.record(cx, res_size as u64, &attrs);
}

13
src/telemetry/mod.rs
View file

@ -6,11 +6,12 @@ use std::time::Duration;
use crate::cli::validator::parser::env_filter::CustomEnvFilter;
use once_cell::sync::Lazy;
use opentelemetry::metrics::MetricsError;
use opentelemetry::sdk::resource::{
EnvResourceDetector, SdkProvidedResourceDetector, TelemetryResourceDetector,
};
use opentelemetry::sdk::Resource;
use opentelemetry::KeyValue;
use opentelemetry::{Context as TelemetryContext, KeyValue};
use tracing::{Level, Subscriber};
use tracing_subscriber::prelude::*;
use tracing_subscriber::util::SubscriberInitExt;
@ -86,10 +87,18 @@ impl Builder {
/// Install the tracing dispatcher globally
pub fn init(self) {
self.build().init()
self.build().init();
}
}
pub fn shutdown() -> Result<(), MetricsError> {
// Flush all telemetry data
opentelemetry::global::shutdown_tracer_provider();
metrics::shutdown(&TelemetryContext::current())?;
Ok(())
}
/// Create an EnvFilter from the given value. If the value is not a valid log level, it will be treated as EnvFilter directives.
pub fn filter_from_value(v: &str) -> Result<EnvFilter, tracing_subscriber::filter::ParseError> {
match v {