open-consul/agent/log-drop/log-drop.go

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package logdrop
import (
"context"
"github.com/hashicorp/go-hclog"
)
// Logger mimic the interface from hclog.Logger
//
//go:generate mockery --name Logger --inpackage
type Logger interface {
Log(level hclog.Level, msg string, args ...interface{})
}
type Log struct {
s string
i []interface{}
l hclog.Level
}
type logDropSink struct {
logger Logger
logCh chan Log
dropFn func(l Log)
}
// Accept consume a log and push it into a channel,
// if the channel is filled it will call dropFn
func (r *logDropSink) Accept(_ string, level hclog.Level, msg string, args ...interface{}) {
r.pushLog(Log{l: level, s: msg, i: args})
}
func (r *logDropSink) pushLog(l Log) {
select {
case r.logCh <- l:
default:
r.dropFn(l)
}
}
func (r *logDropSink) logConsumer(ctx context.Context) {
for {
select {
case l := <-r.logCh:
r.logger.Log(l.l, l.s, l.i...)
case <-ctx.Done():
return
}
}
}
// NewLogDropSink create a log Logger that wrap another Logger
// It also create a go routine for consuming logs, the given context need to be canceled
// to properly deallocate the Logger.
func NewLogDropSink(ctx context.Context, depth int, logger Logger, dropFn func(l Log)) hclog.SinkAdapter {
r := &logDropSink{
logger: logger,
logCh: make(chan Log, depth),
dropFn: dropFn,
}
go r.logConsumer(ctx)
return r
}