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alils.go
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alils.go
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package alils
import (
"encoding/json"
"github.com/astaxie/beego/logs"
"github.com/gogo/protobuf/proto"
"strings"
"sync"
"time"
)
const (
CacheSize int = 64
Delimiter string = "##"
)
type AliLSConfig struct {
Project string `json:"project"`
Endpoint string `json:"endpoint"`
KeyID string `json:"key_id"`
KeySecret string `json:"key_secret"`
LogStore string `json:"log_store"`
Topics []string `json:"topics"`
Source string `json:"source"`
Level int `json:"level"`
FlushWhen int `json:"flush_when"`
}
// aliLSWriter implements LoggerInterface.
// it writes messages in keep-live tcp connection.
type aliLSWriter struct {
store *LogStore
group []*LogGroup
withMap bool
groupMap map[string]*LogGroup
lock *sync.Mutex
AliLSConfig
}
// 创建提供Logger接口的日志服务
func NewAliLS() logs.Logger {
alils := new(aliLSWriter)
alils.Level = logs.LevelTrace
return alils
}
// 读取配置
// 初始化必要的数据结构
func (c *aliLSWriter) Init(jsonConfig string) (err error) {
json.Unmarshal([]byte(jsonConfig), c)
if c.FlushWhen > CacheSize {
c.FlushWhen = CacheSize
}
// 初始化Project
prj := &LogProject{
Name: c.Project,
Endpoint: c.Endpoint,
AccessKeyId: c.KeyID,
AccessKeySecret: c.KeySecret,
}
// 获取logstore
c.store, err = prj.GetLogStore(c.LogStore)
if err != nil {
return err
}
// 创建默认Log Group
c.group = append(c.group, &LogGroup{
Topic: proto.String(""),
Source: proto.String(c.Source),
Logs: make([]*Log, 0, c.FlushWhen),
})
// 创建其它Log Group
c.groupMap = make(map[string]*LogGroup)
for _, topic := range c.Topics {
lg := &LogGroup{
Topic: proto.String(topic),
Source: proto.String(c.Source),
Logs: make([]*Log, 0, c.FlushWhen),
}
c.group = append(c.group, lg)
c.groupMap[topic] = lg
}
if len(c.group) == 1 {
c.withMap = false
} else {
c.withMap = true
}
c.lock = &sync.Mutex{}
return nil
}
// WriteMsg write message in connection.
// if connection is down, try to re-connect.
func (c *aliLSWriter) WriteMsg(when time.Time, msg string, level int) (err error) {
if level > c.Level {
return nil
}
var topic string
var content string
var lg *LogGroup
if c.withMap {
// 解析出Topic,并匹配LogGroup
strs := strings.SplitN(msg, Delimiter, 2)
if len(strs) == 2 {
pos := strings.LastIndex(strs[0], " ")
topic = strs[0][pos+1 : len(strs[0])]
content = strs[0][0:pos] + strs[1]
lg = c.groupMap[topic]
}
// 默认发到空Topic
if lg == nil {
topic = ""
content = msg
lg = c.group[0]
}
} else {
topic = ""
content = msg
lg = c.group[0]
}
// 生成日志
c1 := &Log_Content{
Key: proto.String("msg"),
Value: proto.String(content),
}
l := &Log{
Time: proto.Uint32(uint32(when.Unix())), // 填写日志时间
Contents: []*Log_Content{
c1,
},
}
c.lock.Lock()
lg.Logs = append(lg.Logs, l)
c.lock.Unlock()
// 满足条件则Flush
if len(lg.Logs) >= c.FlushWhen {
c.flush(lg)
}
return nil
}
// Flush implementing method. empty.
func (c *aliLSWriter) Flush() {
// flush所有group
for _, lg := range c.group {
c.flush(lg)
}
}
// Destroy destroy connection writer and close tcp listener.
func (c *aliLSWriter) Destroy() {
}
func (c *aliLSWriter) flush(lg *LogGroup) {
c.lock.Lock()
defer c.lock.Unlock()
// 把以上的LogGroup推送到SLS服务器,
// SLS服务器会根据该logstore的shard个数自动进行负载均衡。
err := c.store.PutLogs(lg)
if err != nil {
return
}
lg.Logs = make([]*Log, 0, c.FlushWhen)
}
func init() {
logs.Register(logs.AdapterAliLS, NewAliLS)
}