micro/debug/log/memory/memory.go

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// Package memory provides an in memory log buffer
package memory
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import (
"fmt"
"github.com/micro/go-micro/v3/debug/log"
"github.com/micro/go-micro/v3/util/ring"
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)
var (
// DefaultSize of the logger buffer
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DefaultSize = 1024
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)
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// memoryLog is default micro log
type memoryLog struct {
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*ring.Buffer
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}
// NewLog returns default Logger with
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func NewLog(opts ...log.Option) log.Log {
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// get default options
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options := log.DefaultOptions()
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// apply requested options
for _, o := range opts {
o(&options)
}
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return &memoryLog{
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Buffer: ring.New(options.Size),
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}
}
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// Write writes logs into logger
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func (l *memoryLog) Write(r log.Record) error {
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l.Buffer.Put(fmt.Sprint(r.Message))
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return nil
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}
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// Read reads logs and returns them
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func (l *memoryLog) Read(opts ...log.ReadOption) ([]log.Record, error) {
options := log.ReadOptions{}
// initialize the read options
for _, o := range opts {
o(&options)
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}
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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)
}
}
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records := make([]log.Record, 0, len(entries))
for _, entry := range entries {
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record := log.Record{
Timestamp: entry.Timestamp,
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Message: entry.Value,
}
records = append(records, record)
}
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return records, nil
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}
// Stream returns channel for reading log records
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// along with a stop channel, close it when done
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func (l *memoryLog) Stream() (log.Stream, error) {
// get stream channel from ring buffer
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stream, stop := l.Buffer.Stream()
// make a buffered channel
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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 {
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records <- log.Record{
Timestamp: entry.Timestamp,
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Message: entry.Value,
Metadata: make(map[string]string),
}
}
// now stream continuously
for entry := range stream {
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records <- log.Record{
Timestamp: entry.Timestamp,
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Message: entry.Value,
Metadata: make(map[string]string),
}
}
}()
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return &logStream{
stream: records,
stop: stop,
}, nil
}