harness-drone/livelog/streamer.go

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// Copyright 2019 Drone IO, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package livelog
import (
"context"
"errors"
"sync"
"github.com/drone/drone/core"
)
// error returned when a stream is not registered with
// the streamer.
var errStreamNotFound = errors.New("stream: not found")
type streamer struct {
sync.Mutex
streams map[int64]*stream
}
// New returns a new in-memory log streamer.
func newStreamer() core.LogStream {
return &streamer{
streams: make(map[int64]*stream),
}
}
func (s *streamer) Create(ctx context.Context, id int64) error {
s.Lock()
s.streams[id] = newStream()
s.Unlock()
return nil
}
func (s *streamer) Delete(ctx context.Context, id int64) error {
s.Lock()
stream, ok := s.streams[id]
if ok {
delete(s.streams, id)
}
s.Unlock()
if !ok {
return errStreamNotFound
}
return stream.close()
}
func (s *streamer) Write(ctx context.Context, id int64, line *core.Line) error {
s.Lock()
stream, ok := s.streams[id]
s.Unlock()
if !ok {
return errStreamNotFound
}
return stream.write(line)
}
func (s *streamer) Tail(ctx context.Context, id int64) (<-chan *core.Line, <-chan error) {
s.Lock()
stream, ok := s.streams[id]
s.Unlock()
if !ok {
return nil, nil
}
return stream.subscribe(ctx)
}
func (s *streamer) Info(ctx context.Context) *core.LogStreamInfo {
s.Lock()
defer s.Unlock()
info := &core.LogStreamInfo{
Streams: map[int64]int{},
}
for id, stream := range s.streams {
stream.Lock()
info.Streams[id] = len(stream.list)
stream.Unlock()
}
return info
}