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Beego/logs/alils/log_store.go
2017-04-30 22:41:23 +08:00

272 lines
5.8 KiB
Go
Executable File

package alils
import (
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"net/http/httputil"
"strconv"
lz4 "github.com/cloudflare/golz4"
"github.com/gogo/protobuf/proto"
)
// LogStore Store the logs
type LogStore struct {
Name string `json:"logstoreName"`
TTL int
ShardCount int
CreateTime uint32
LastModifyTime uint32
project *LogProject
}
// Shard define the Log Shard
type Shard struct {
ShardID int `json:"shardID"`
}
// ListShards returns shard id list of this logstore.
func (s *LogStore) ListShards() (shardIDs []int, err error) {
h := map[string]string{
"x-sls-bodyrawsize": "0",
}
uri := fmt.Sprintf("/logstores/%v/shards", s.Name)
r, err := request(s.project, "GET", uri, h, nil)
if err != nil {
return
}
buf, err := ioutil.ReadAll(r.Body)
if err != nil {
return
}
if r.StatusCode != http.StatusOK {
errMsg := &errorMessage{}
err = json.Unmarshal(buf, errMsg)
if err != nil {
err = fmt.Errorf("failed to list logstore")
dump, _ := httputil.DumpResponse(r, true)
fmt.Println(dump)
return
}
err = fmt.Errorf("%v:%v", errMsg.Code, errMsg.Message)
return
}
var shards []*Shard
err = json.Unmarshal(buf, &shards)
if err != nil {
return
}
for _, v := range shards {
shardIDs = append(shardIDs, v.ShardID)
}
return
}
// PutLogs put logs into logstore.
// The callers should transform user logs into LogGroup.
func (s *LogStore) PutLogs(lg *LogGroup) (err error) {
body, err := proto.Marshal(lg)
if err != nil {
return
}
// Compresse body with lz4
out := make([]byte, lz4.CompressBound(body))
n, err := lz4.Compress(body, out)
if err != nil {
return
}
h := map[string]string{
"x-sls-compresstype": "lz4",
"x-sls-bodyrawsize": fmt.Sprintf("%v", len(body)),
"Content-Type": "application/x-protobuf",
}
uri := fmt.Sprintf("/logstores/%v", s.Name)
r, err := request(s.project, "POST", uri, h, out[:n])
if err != nil {
return
}
buf, err := ioutil.ReadAll(r.Body)
if err != nil {
return
}
if r.StatusCode != http.StatusOK {
errMsg := &errorMessage{}
err = json.Unmarshal(buf, errMsg)
if err != nil {
err = fmt.Errorf("failed to put logs")
dump, _ := httputil.DumpResponse(r, true)
fmt.Println(dump)
return
}
err = fmt.Errorf("%v:%v", errMsg.Code, errMsg.Message)
return
}
return
}
// GetCursor gets log cursor of one shard specified by shardID.
// The from can be in three form: a) unix timestamp in seccond, b) "begin", c) "end".
// For more detail please read: http://gitlab.alibaba-inc.com/sls/doc/blob/master/api/shard.md#logstore
func (s *LogStore) GetCursor(shardID int, from string) (cursor string, err error) {
h := map[string]string{
"x-sls-bodyrawsize": "0",
}
uri := fmt.Sprintf("/logstores/%v/shards/%v?type=cursor&from=%v",
s.Name, shardID, from)
r, err := request(s.project, "GET", uri, h, nil)
if err != nil {
return
}
buf, err := ioutil.ReadAll(r.Body)
if err != nil {
return
}
if r.StatusCode != http.StatusOK {
errMsg := &errorMessage{}
err = json.Unmarshal(buf, errMsg)
if err != nil {
err = fmt.Errorf("failed to get cursor")
dump, _ := httputil.DumpResponse(r, true)
fmt.Println(dump)
return
}
err = fmt.Errorf("%v:%v", errMsg.Code, errMsg.Message)
return
}
type Body struct {
Cursor string
}
body := &Body{}
err = json.Unmarshal(buf, body)
if err != nil {
return
}
cursor = body.Cursor
return
}
// GetLogsBytes gets logs binary data from shard specified by shardID according cursor.
// The logGroupMaxCount is the max number of logGroup could be returned.
// The nextCursor is the next curosr can be used to read logs at next time.
func (s *LogStore) GetLogsBytes(shardID int, cursor string,
logGroupMaxCount int) (out []byte, nextCursor string, err error) {
h := map[string]string{
"x-sls-bodyrawsize": "0",
"Accept": "application/x-protobuf",
"Accept-Encoding": "lz4",
}
uri := fmt.Sprintf("/logstores/%v/shards/%v?type=logs&cursor=%v&count=%v",
s.Name, shardID, cursor, logGroupMaxCount)
r, err := request(s.project, "GET", uri, h, nil)
if err != nil {
return
}
buf, err := ioutil.ReadAll(r.Body)
if err != nil {
return
}
if r.StatusCode != http.StatusOK {
errMsg := &errorMessage{}
err = json.Unmarshal(buf, errMsg)
if err != nil {
err = fmt.Errorf("failed to get cursor")
dump, _ := httputil.DumpResponse(r, true)
fmt.Println(dump)
return
}
err = fmt.Errorf("%v:%v", errMsg.Code, errMsg.Message)
return
}
v, ok := r.Header["X-Sls-Compresstype"]
if !ok || len(v) == 0 {
err = fmt.Errorf("can't find 'x-sls-compresstype' header")
return
}
if v[0] != "lz4" {
err = fmt.Errorf("unexpected compress type:%v", v[0])
return
}
v, ok = r.Header["X-Sls-Cursor"]
if !ok || len(v) == 0 {
err = fmt.Errorf("can't find 'x-sls-cursor' header")
return
}
nextCursor = v[0]
v, ok = r.Header["X-Sls-Bodyrawsize"]
if !ok || len(v) == 0 {
err = fmt.Errorf("can't find 'x-sls-bodyrawsize' header")
return
}
bodyRawSize, err := strconv.Atoi(v[0])
if err != nil {
return
}
out = make([]byte, bodyRawSize)
err = lz4.Uncompress(buf, out)
if err != nil {
return
}
return
}
// LogsBytesDecode decodes logs binary data retruned by GetLogsBytes API
func LogsBytesDecode(data []byte) (gl *LogGroupList, err error) {
gl = &LogGroupList{}
err = proto.Unmarshal(data, gl)
if err != nil {
return
}
return
}
// GetLogs gets logs from shard specified by shardID according cursor.
// The logGroupMaxCount is the max number of logGroup could be returned.
// The nextCursor is the next curosr can be used to read logs at next time.
func (s *LogStore) GetLogs(shardID int, cursor string,
logGroupMaxCount int) (gl *LogGroupList, nextCursor string, err error) {
out, nextCursor, err := s.GetLogsBytes(shardID, cursor, logGroupMaxCount)
if err != nil {
return
}
gl, err = LogsBytesDecode(out)
if err != nil {
return
}
return
}