forked from keybase/client
/
log_queue.go
98 lines (83 loc) · 1.96 KB
/
log_queue.go
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// Copyright 2015 Keybase, Inc. All rights reserved. Use of
// this source code is governed by the included BSD license.
package service
import (
"fmt"
"os"
keybase1 "github.com/keybase/client/go/protocol/keybase1"
)
type logQueue struct {
name string
level keybase1.LogLevel
ui *LogUI
handleID int
buffer chan *logEntry
drop chan bool
}
func newLogQueue(name string, level keybase1.LogLevel, ui *LogUI) *logQueue {
q := &logQueue{
name: name,
level: level,
ui: ui,
buffer: make(chan *logEntry, 10000),
drop: make(chan bool, 1),
}
go q.processQueue()
return q
}
func (q *logQueue) String() string {
return fmt.Sprintf("%s: level %d, handle id %d", q.name, q.level, q.handleID)
}
func (q *logQueue) SetHandleID(id int) {
q.handleID = id
}
func (q *logQueue) HandleID() int {
return q.handleID
}
func (q *logQueue) Log(e *logEntry) {
if e.level < q.level {
return
}
select {
case q.buffer <- e:
q.checkDropFlag()
default:
q.setDropFlag()
}
}
func (q *logQueue) Shutdown() {
close(q.buffer)
q.buffer = nil
}
func (q *logQueue) processQueue() {
for e := range q.buffer {
if e.level < q.level {
continue
}
q.ui.Log(e.level, e.format, e.args)
}
}
// setDropFlag puts a flag into the drop channel if the channel is
// empty. This is to signal that external log messages have been
// dropped.
func (q *logQueue) setDropFlag() {
select {
case q.drop <- true:
// do this outside the logging mechanism to make sure it gets through
fmt.Fprintf(os.Stderr, "WARNING: dropping log messages destined for %q due to full log buffer\n", q.name)
default:
}
}
// checkDropFlag checks to see if anything is in the drop channel.
// If there is a flag in there, it will warn client that log
// messages were dropped.
func (q *logQueue) checkDropFlag() {
select {
case <-q.drop:
q.buffer <- &logEntry{
level: keybase1.LogLevel_WARN,
format: "Service log messages were dropped due to full buffer",
}
default:
}
}