432 lines
9.2 KiB
Go
432 lines
9.2 KiB
Go
// Copyright © 2016 Abcum Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package db
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import (
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"fmt"
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"context"
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"github.com/abcum/surreal/kvs"
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"github.com/abcum/surreal/sql"
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"github.com/abcum/surreal/util/data"
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"github.com/abcum/surreal/util/indx"
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"github.com/abcum/surreal/util/keys"
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)
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type document struct {
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i *iterator
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id *sql.Thing
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enc []byte
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key *keys.Thing
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val kvs.KV
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lck bool
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doc *data.Doc
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initial *data.Doc
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current *data.Doc
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changed bool
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}
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func newDocument(i *iterator, key *keys.Thing, val kvs.KV, doc *data.Doc) (d *document) {
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d = documentPool.Get().(*document)
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d.i = i
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d.id = nil
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d.enc = nil
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d.key = key
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d.val = val
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d.doc = doc
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d.lck = false
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return
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}
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func (d *document) close() {
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documentPool.Put(d)
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}
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func (d *document) erase() (err error) {
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d.changed, d.current = true, data.Consume(nil)
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return
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}
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func (d *document) query(ctx context.Context, stm sql.Statement) (val interface{}, err error) {
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defer func() {
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if r := recover(); r != nil {
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var ok bool
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if err, ok = r.(error); !ok {
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err = fmt.Errorf("%v", r)
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}
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}
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d.ulock(ctx)
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d.close()
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}()
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switch stm := stm.(type) {
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default:
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return nil, nil
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case *sql.SelectStatement:
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return d.runSelect(ctx, stm)
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case *sql.CreateStatement:
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return d.runCreate(ctx, stm)
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case *sql.UpdateStatement:
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return d.runUpdate(ctx, stm)
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case *sql.DeleteStatement:
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return d.runDelete(ctx, stm)
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case *sql.RelateStatement:
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return d.runRelate(ctx, stm)
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case *sql.InsertStatement:
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return d.runInsert(ctx, stm)
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case *sql.UpsertStatement:
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return d.runUpsert(ctx, stm)
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}
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}
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func (d *document) init(ctx context.Context) (err error) {
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// A table of records were requested
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// so we have the values, but no key
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// yet, so we need to decode the KV
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// store key into a Thing key.
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if d.key == nil && d.val != nil {
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d.enc = d.val.Key()
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d.key = &keys.Thing{}
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d.key.Decode(d.enc)
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}
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return
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}
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func (d *document) lock(ctx context.Context) (err error) {
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if d.key != nil {
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d.lck = true
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d.i.e.lock.Lock(ctx, d.key)
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}
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return
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}
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func (d *document) ulock(ctx context.Context) (err error) {
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if d.key != nil && d.lck {
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d.lck = false
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d.i.e.lock.Unlock(ctx, d.key)
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}
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return
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}
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func (d *document) setup(ctx context.Context) (err error) {
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// A specific record has been requested
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// and we have a key, but no value has
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// been loaded yet, so the record needs
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// to be loaded from the KV store.
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if d.key != nil && d.val == nil {
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d.enc = d.key.Encode()
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d.val, err = d.i.e.dbo.Get(ctx, d.i.versn, d.enc)
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if err != nil {
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return
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}
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}
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// A subquery or data param has been
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// loaded, and we might not have a key
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// or a value, so let's load the data
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// into a document, so that we can
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// maniuplate the virtual document.
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if d.doc != nil {
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enc := d.doc.Encode()
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d.initial = data.New().Decode(enc)
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d.current = data.New().Decode(enc)
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}
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// The requested record has been loaded
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// from the KV store (and not from a
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// subquery or data variable), but does
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// not exist. So we'll create a document
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// for processing any record changes.
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if d.doc == nil && d.val != nil && d.val.Exi() == false {
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d.initial = data.New()
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d.current = data.New()
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}
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// The requested record has been loaded
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// from the KV store (and not from a
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// subquery or data variable). So we'll
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// load the KV data into a document for
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// processing any record changes.
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if d.doc == nil && d.val != nil && d.val.Exi() == true {
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d.initial = data.New().Decode(d.val.Val())
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d.current = data.New().Decode(d.val.Val())
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}
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// Finally if we are dealing with a record
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// which is not data from the result of a
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// subquery, then generate the ID.
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if d.key != nil {
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d.id = sql.NewThing(d.key.TB, d.key.ID)
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}
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return
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}
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func (d *document) forced(ctx context.Context) bool {
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if val := ctx.Value(ctxKeyForce); val != nil {
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return val.(bool)
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}
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return false
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}
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func (d *document) hasChanged(ctx context.Context) bool {
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return d.initial.Same(d.current) == false
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}
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func (d *document) shouldDrop(ctx context.Context) (bool, error) {
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// Check whether it is specified
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// that the table should drop
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// writes, and if so, then return.
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tb, err := d.i.e.dbo.GetTB(ctx, d.key.NS, d.key.DB, d.key.TB)
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if err != nil {
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return false, err
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}
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return tb.Drop, err
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}
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func (d *document) shouldVersn(ctx context.Context) (bool, error) {
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// Check whether it is specified
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// that the table should keep
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// all document versions.
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tb, err := d.i.e.dbo.GetTB(ctx, d.key.NS, d.key.DB, d.key.TB)
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if err != nil {
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return false, err
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}
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return tb.Vers, err
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}
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func (d *document) storeThing(ctx context.Context) (err error) {
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defer d.ulock(ctx)
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// Check that the record has been
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// changed, and if not, return.
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if !d.changed {
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return
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}
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// Check that the table should
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// drop data being written.
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if ok, err := d.shouldDrop(ctx); ok {
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return err
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}
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// Write the value to the data
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// layer and return any errors.
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if ok, err := d.shouldVersn(ctx); err != nil {
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return err
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} else if ok == true {
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_, err = d.i.e.dbo.Put(ctx, d.i.e.time, d.enc, d.current.Encode())
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} else if ok == false {
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_, err = d.i.e.dbo.Put(ctx, 0, d.enc, d.current.Encode())
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}
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return
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}
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func (d *document) purgeThing(ctx context.Context) (err error) {
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defer d.ulock(ctx)
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// Check that the table should
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// drop data being written.
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if ok, err := d.shouldDrop(ctx); ok {
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return err
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}
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// Reset the item by writing a
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// nil value to the storage.
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if ok, err := d.shouldVersn(ctx); err != nil {
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return err
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} else if ok == true {
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_, err = d.i.e.dbo.Put(ctx, d.i.e.time, d.enc, nil)
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} else if ok == false {
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_, err = d.i.e.dbo.Clr(ctx, d.enc)
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}
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return
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}
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func (d *document) storeIndex(ctx context.Context) (err error) {
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// Check if this query has been run
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// in forced mode, or return.
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forced := d.forced(ctx)
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// Check that the rcord has been
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// changed, and if not, return.
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if !forced && !d.changed {
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return
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}
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// Check that the table should
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// drop data being written.
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if ok, err := d.shouldDrop(ctx); ok {
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return err
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}
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// Get the index values specified
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// for this table, loop through
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// them, and compute the changes.
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ixs, err := d.i.e.dbo.AllIX(ctx, d.key.NS, d.key.DB, d.key.TB)
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if err != nil {
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return err
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}
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for _, ix := range ixs {
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del := indx.Build(ix.Cols, d.initial)
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add := indx.Build(ix.Cols, d.current)
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if !forced {
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del, add = indx.Diff(del, add)
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}
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if ix.Uniq == true {
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for _, f := range del {
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enfd := data.Consume(f).Encode()
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didx := &keys.Index{KV: d.key.KV, NS: d.key.NS, DB: d.key.DB, TB: d.key.TB, IX: ix.Name.VA, FD: enfd}
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d.i.e.dbo.DelC(ctx, d.i.e.time, didx.Encode(), d.id.Bytes())
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}
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for _, f := range add {
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enfd := data.Consume(f).Encode()
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aidx := &keys.Index{KV: d.key.KV, NS: d.key.NS, DB: d.key.DB, TB: d.key.TB, IX: ix.Name.VA, FD: enfd}
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if _, err = d.i.e.dbo.PutC(ctx, 0, aidx.Encode(), d.id.Bytes(), nil); err != nil {
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return &IndexError{tb: d.key.TB, name: ix.Name, cols: ix.Cols, vals: f}
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}
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}
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}
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if ix.Uniq == false {
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for _, f := range del {
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enfd := data.Consume(f).Encode()
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didx := &keys.Point{KV: d.key.KV, NS: d.key.NS, DB: d.key.DB, TB: d.key.TB, IX: ix.Name.VA, FD: enfd, ID: d.key.ID}
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d.i.e.dbo.DelC(ctx, d.i.e.time, didx.Encode(), d.id.Bytes())
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}
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for _, f := range add {
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enfd := data.Consume(f).Encode()
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aidx := &keys.Point{KV: d.key.KV, NS: d.key.NS, DB: d.key.DB, TB: d.key.TB, IX: ix.Name.VA, FD: enfd, ID: d.key.ID}
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if _, err = d.i.e.dbo.PutC(ctx, 0, aidx.Encode(), d.id.Bytes(), nil); err != nil {
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return &IndexError{tb: d.key.TB, name: ix.Name, cols: ix.Cols, vals: f}
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}
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}
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}
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}
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return
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}
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func (d *document) purgeIndex(ctx context.Context) (err error) {
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// Check if this query has been run
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// in forced mode, or return.
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forced := d.forced(ctx)
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// Check that the rcord has been
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// changed, and if not, return.
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if !forced && !d.changed {
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return
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}
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// Check that the table should
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// drop data being written.
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if ok, err := d.shouldDrop(ctx); ok {
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return err
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}
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// Get the index values specified
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// for this table, loop through
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// them, and compute the changes.
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ixs, err := d.i.e.dbo.AllIX(ctx, d.key.NS, d.key.DB, d.key.TB)
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if err != nil {
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return err
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}
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for _, ix := range ixs {
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del := indx.Build(ix.Cols, d.initial)
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if ix.Uniq == true {
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for _, v := range del {
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key := &keys.Index{KV: d.key.KV, NS: d.key.NS, DB: d.key.DB, TB: d.key.TB, IX: ix.Name.VA, FD: v}
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d.i.e.dbo.DelC(ctx, 0, key.Encode(), d.id.Bytes())
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}
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}
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if ix.Uniq == false {
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for _, v := range del {
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key := &keys.Point{KV: d.key.KV, NS: d.key.NS, DB: d.key.DB, TB: d.key.TB, IX: ix.Name.VA, FD: v, ID: d.key.ID}
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d.i.e.dbo.DelC(ctx, 0, key.Encode(), d.id.Bytes())
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}
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}
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}
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return
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}
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