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2785206535
* Formatting. * fix: [CDE-150]: In logstream, adding locking and panic recovery around a subscriber's publish method. Adding check in the stream's publish method to not publish if the sub is closed. Closing the err channel in the log stream API handler.
62 lines
1.3 KiB
Go
62 lines
1.3 KiB
Go
// Copyright 2023 Harness, Inc.
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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 livelog
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import (
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"sync"
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"github.com/rs/zerolog/log"
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)
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type subscriber struct {
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sync.Mutex
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handler chan *Line
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closec chan struct{}
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closed bool
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}
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func (s *subscriber) publish(line *Line) {
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defer func() {
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r := recover()
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if r != nil {
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log.Debug().Msgf("publishing to closed subscriber")
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}
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}()
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s.Lock()
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defer s.Unlock()
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select {
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case <-s.closec:
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case s.handler <- line:
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default:
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// lines are sent on a buffered channel. If there
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// is a slow consumer that is not processing events,
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// the buffered channel will fill and newer messages
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// are ignored.
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}
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}
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func (s *subscriber) close() {
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s.Lock()
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if !s.closed {
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close(s.closec)
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close(s.handler)
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s.closed = true
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}
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s.Unlock()
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}
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