139 lines
3.1 KiB
Go
139 lines
3.1 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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"context"
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"github.com/abcum/surreal/sql"
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)
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// Lives checks if any table views are specified for
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// this table, and executes them in name order.
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func (d *document) lives(ctx context.Context, when method) (err error) {
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// Check if this query has been run
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// in forced mode, because of an
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// index or foreign table update.
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forced := d.forced(ctx)
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// If this document has not changed
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// then there is no need to update
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// any registered live queries.
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if !forced && !d.changed {
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return nil
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}
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// Get the foreign read-only tables
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// specified for this table, and
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// update values which have changed.
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lvs, err := d.i.e.tx.AllLV(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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// Loop over the currently running
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// live queries so that we can pass
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// change notifications to the socket.
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for _, lv := range lvs {
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// Check whether the change was made by
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// the same connection as the live query,
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// and if it is then don't notify changes.
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if d.i.e.id == lv.FB {
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continue
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}
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// Load the socket which owns the live
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// query so that we can check the socket
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// permissions, and send the notifications.
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if sck, ok := sockets.Load(lv.FB); ok {
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var out interface{}
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// Create a new context for this socket
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// which has the correct connection
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// variables, and auth levels.
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ctx = sck.(*socket).ctx()
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// Check whether this live query has the
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// necessary permissions to view this
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// document, or continue to the next query.
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ok, err = d.grant(ctx, when)
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if err != nil {
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continue
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} else if !ok {
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continue
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}
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// Check whether this document matches the
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// filter conditions for the live query and
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// if not, then continue to the next query.
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ok, err = d.check(ctx, lv.Cond)
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if err != nil {
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continue
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} else if !ok {
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continue
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}
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switch lv.Diff {
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// If the live query has specified to only
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// receive diff changes, then there will be
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// no projected fields for this query.
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case true:
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out, _ = d.yield(ctx, lv, sql.DIFF)
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// If the query has projected fields which it
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// wants to receive, then let's fetch these
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// fields, and return them to the socket.
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case false:
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out, _ = d.yield(ctx, lv, sql.ILLEGAL)
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}
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switch when {
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case _DELETE:
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sck.(*socket).queue(d.i.e.id, lv.ID, "DELETE", d.id)
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case _CREATE:
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if out != nil {
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sck.(*socket).queue(d.i.e.id, lv.ID, "CREATE", out)
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}
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case _UPDATE:
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if out != nil {
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sck.(*socket).queue(d.i.e.id, lv.ID, "UPDATE", out)
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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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