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memory.go
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memory.go
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// 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
//
// https://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.
//
// Original source: github.com/micro/go-micro/v3/debug/log/memory/memory.go
// Package memory provides an in memory log buffer
package memory
import (
"fmt"
"github.com/micro/micro/v3/service/debug/log"
"github.com/micro/micro/v3/util/ring"
)
// memoryLog is default micro log
type memoryLog struct {
*ring.Buffer
}
// NewLog returns default Logger with
func NewLog(opts ...log.Option) log.Log {
// get default options
options := log.DefaultOptions()
// apply requested options
for _, o := range opts {
o(&options)
}
return &memoryLog{
Buffer: ring.New(options.Size),
}
}
// Write writes logs into logger
func (l *memoryLog) Write(r log.Record) error {
l.Buffer.Put(fmt.Sprint(r.Message))
return nil
}
// Read reads logs and returns them
func (l *memoryLog) Read(opts ...log.ReadOption) ([]log.Record, error) {
options := log.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([]log.Record, 0, len(entries))
for _, entry := range entries {
record := log.Record{
Timestamp: entry.Timestamp,
Message: 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 *memoryLog) Stream() (log.Stream, error) {
// get stream channel from ring buffer
stream, stop := l.Buffer.Stream()
// make a buffered channel
records := make(chan log.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 <- log.Record{
Timestamp: entry.Timestamp,
Message: entry.Value,
Metadata: make(map[string]string),
}
}
// now stream continuously
for entry := range stream {
records <- log.Record{
Timestamp: entry.Timestamp,
Message: entry.Value,
Metadata: make(map[string]string),
}
}
}()
return &logStream{
stream: records,
stop: stop,
}, nil
}