// Log will format a JSON map and write it to Out
func (j *JSONLogger) Log(keyvals ...interface{}) error {
n := (len(keyvals) + 1) / 2 // +1 to handle case when len is odd
m := make(map[string]interface{}, n)
for i := 0; i < len(keyvals); i += 2 {
var k, v interface{}
if i == len(keyvals)-1 {
k, v = j.MissingValueKey, keyvals[i]
} else {
k, v = keyvals[i], keyvals[i+1]
}
m[mapKey(k)] = mapValue(v)
}
return errors.Annotate(json.NewEncoder(j.Out).Encode(m), "cannot JSON encode log")
}
// Log writes the keyvalus in logfmt format to Out
func (l *LogfmtLogger) Log(keyvals ...interface{}) error {
// The Logger interface requires implementations to be safe for concurrent
// use by multiple goroutines. For this implementation that means making
// only one call to l.w.Write() for each call to Log. We first collect all
// of the bytes into b, and then call l.w.Write(b).
if len(keyvals)%2 != 0 {
keyvals = append(keyvals[0:len(keyvals)-1:len(keyvals)-1], l.MissingValueKey, keyvals[len(keyvals)-1])
}
b, err := logfmt.MarshalKeyvals(keyvals...)
if err != nil {
return err
}
b = append(b, '\n')
if _, err := l.Out.Write(b); err != nil {
return errors.Annotate(err, "cannot write out logfmt for log")
}
return nil
}
// Zk creates a zookeeper readable backing
func Zk(zkConnector ZkConnector, conf *ZkConfig) (ReaderWriter, error) {
conf = pointer.FillDefaultFrom(conf, DefaultZkConfig).(*ZkConfig)
ret := &zkConfig{
rootLogger: log.NewContext(conf.Logger).With(logkey.DistconfBacking, "zk"),
shouldQuit: make(chan struct{}),
callbacks: callbackMap{
callbacks: make(map[string][]backingCallbackFunction),
},
refreshDelay: atomicDuration{
refreshRetryDelay: time.Millisecond * 500,
},
}
var err error
ret.conn, ret.eventChan, err = zkConnector.Connect()
if err != nil {
return nil, errors.Annotate(err, "cannot create zk connection")
}
go ret.drainEventChan(conf.Logger)
return ret, nil
}