Add initial implementation for parallel execution

src/dbs/channel.rs

@@ -0,0 +1,115 @@
+use crate::cnf::ID_CHARS;
+use crate::dbs::Options;
+use crate::dbs::Runtime;
+use crate::dbs::Transaction;
+use crate::err::Error;
+use crate::key::thing;
+use crate::sql::array::Array;
+use crate::sql::model::Model;
+use crate::sql::table::Table;
+use crate::sql::thing::Thing;
+use crate::sql::value::Value;
+use async_recursion::async_recursion;
+use nanoid::nanoid;
+use tokio::sync::mpsc::UnboundedSender;
+
+pub type Channel = UnboundedSender<(Option<Thing>, Value)>;
+
+impl Value {
+	pub async fn channel(
+		self,
+		ctx: Runtime,
+		opt: Options,
+		chn: Channel,
+		txn: Transaction,
+	) -> Result<(), Error> {
+		match self {
+			Value::Array(v) => v.process(&ctx, &opt, &chn, &txn).await?,
+			Value::Model(v) => v.process(&ctx, &opt, &chn, &txn).await?,
+			Value::Thing(v) => v.process(&ctx, &opt, &chn, &txn).await?,
+			Value::Table(v) => v.process(&ctx, &opt, &chn, &txn).await?,
+			v => chn.send((None, v))?,
+		}
+		Ok(())
+	}
+}
+
+impl Array {
+	#[async_recursion]
+	pub async fn process(
+		self,
+		ctx: &Runtime,
+		opt: &Options,
+		chn: &Channel,
+		txn: &Transaction,
+	) -> Result<(), Error> {
+		for v in self.value.into_iter() {
+			match v {
+				Value::Array(v) => v.process(ctx, opt, chn, txn).await?,
+				Value::Model(v) => v.process(ctx, opt, chn, txn).await?,
+				Value::Thing(v) => v.process(ctx, opt, chn, txn).await?,
+				Value::Table(v) => v.process(ctx, opt, chn, txn).await?,
+				v => chn.send((None, v))?,
+			}
+		}
+		Ok(())
+	}
+}
+
+impl Model {
+	pub async fn process(
+		self,
+		ctx: &Runtime,
+		opt: &Options,
+		chn: &Channel,
+		txn: &Transaction,
+	) -> Result<(), Error> {
+		if ctx.is_ok() {
+			if let Some(c) = self.count {
+				for _ in 0..c {
+					Thing {
+						tb: self.table.to_string(),
+						id: nanoid!(20, &ID_CHARS),
+					}
+					.process(ctx, opt, chn, txn)
+					.await?;
+				}
+			}
+			if let Some(r) = self.range {
+				for x in r.0..r.1 {
+					Thing {
+						tb: self.table.to_string(),
+						id: x.to_string(),
+					}
+					.process(ctx, opt, chn, txn)
+					.await?;
+				}
+			}
+		}
+		Ok(())
+	}
+}
+
+impl Thing {
+	pub async fn process(
+		self,
+		ctx: &Runtime,
+		opt: &Options,
+		chn: &Channel,
+		txn: &Transaction,
+	) -> Result<(), Error> {
+		Ok(())
+	}
+}
+
+impl Table {
+	pub async fn process(
+		self,
+		ctx: &Runtime,
+		opt: &Options,
+		chn: &Channel,
+		txn: &Transaction,
+	) -> Result<(), Error> {
+		Ok(())
+	}
+}

src/dbs/iterator.rs

@@ -18,10 +18,6 @@ use crate::sql::value::Value;
 use crate::sql::version::Version;
 use nanoid::nanoid;
 use std::mem;
-use tokio::sync::mpsc;
-use tokio::sync::mpsc::UnboundedSender;
-
-pub type Channel = UnboundedSender<Value>;
 
 #[derive(Default)]
 pub struct Iterator<'a> {
@@ -141,14 +137,18 @@ impl<'a> Iterator<'a> {
 		match self.parallel {
 			// Run statements in parallel
 			true => {
+				// Use multi producer channel
+				use tokio::sync::mpsc;
 				// Create an unbounded channel
-				let (_, mut rx) = mpsc::unbounded_channel();
+				let (chn, mut rx) = mpsc::unbounded_channel();
 				// Process all prepared values
-				for _ in mem::take(&mut self.readies) {
+				for v in mem::take(&mut self.readies) {
-					todo!();
+					tokio::spawn(v.channel(ctx.clone(), opt.clone(), chn.clone(), txn.clone()));
 				}
+				// Drop the main channel reference
+				drop(chn);
 				// Process all processed values
-				while let Some(v) = rx.recv().await {
+				while let Some((k, v)) = rx.recv().await {
 					self.process(&ctx, opt, txn, k, v).await;
 				}
 				// Everything processed ok

src/dbs/mod.rs

@@ -1,4 +1,5 @@
 mod auth;
+mod channel;
 mod dbs;
 mod executor;
 mod export;
@@ -13,6 +14,7 @@ mod transaction;
 mod variables;
 
 pub use self::auth::*;
+pub use self::channel::*;
 pub use self::dbs::*;
 pub use self::executor::*;
 pub use self::iterator::*;