1
0
mirror of https://github.com/go-micro/go-micro.git synced 2024-12-18 08:26:38 +02:00
go-micro/debug/log/default.go
2019-12-17 16:56:55 +00:00

120 lines
2.5 KiB
Go

package log
import (
"fmt"
golog "log"
"github.com/micro/go-micro/util/ring"
)
var (
// DefaultSize of the logger buffer
DefaultSize = 1024
)
// defaultLog is default micro log
type defaultLog struct {
*ring.Buffer
}
// NewLog returns default Logger with
func NewLog(opts ...Option) Log {
// get default options
options := DefaultOptions()
// apply requested options
for _, o := range opts {
o(&options)
}
return &defaultLog{
Buffer: ring.New(options.Size),
}
}
// Write writes logs into logger
func (l *defaultLog) Write(r Record) error {
golog.Print(r.Value)
l.Buffer.Put(fmt.Sprint(r.Value))
return nil
}
// Read reads logs and returns them
func (l *defaultLog) Read(opts ...ReadOption) ([]Record, error) {
options := ReadOptions{}
// initialize the read options
for _, o := range opts {
o(&options)
}
var entries []*ring.Entry
// if Since options ha sbeen specified we honor it
if !options.Since.IsZero() {
entries = l.Buffer.Since(options.Since)
}
// only if we specified valid count constraint
// do we end up doing some serious if-else kung-fu
// if since constraint has been provided
// we return *count* number of logs since the given timestamp;
// otherwise we return last count number of logs
if options.Count > 0 {
switch len(entries) > 0 {
case true:
// if we request fewer logs than what since constraint gives us
if options.Count < len(entries) {
entries = entries[0:options.Count]
}
default:
entries = l.Buffer.Get(options.Count)
}
}
records := make([]Record, 0, len(entries))
for _, entry := range entries {
record := Record{
Timestamp: entry.Timestamp,
Value: entry.Value,
}
records = append(records, record)
}
return records, nil
}
// Stream returns channel for reading log records
// along with a stop channel, close it when done
func (l *defaultLog) Stream() (Stream, error) {
// get stream channel from ring buffer
stream, stop := l.Buffer.Stream()
// make a buffered channel
records := make(chan Record, 128)
// get last 10 records
last10 := l.Buffer.Get(10)
// stream the log records
go func() {
// first send last 10 records
for _, entry := range last10 {
records <- Record{
Timestamp: entry.Timestamp,
Value: entry.Value,
Metadata: make(map[string]string),
}
}
// now stream continuously
for entry := range stream {
records <- Record{
Timestamp: entry.Timestamp,
Value: entry.Value,
Metadata: make(map[string]string),
}
}
}()
return &logStream{
stream: records,
stop: stop,
}, nil
}