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logtastic.go
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logtastic.go
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package logtastic
import (
"context"
"encoding/json"
"fmt"
"io"
"net/http"
"sync"
"time"
"github.com/carlmjohnson/requests"
"github.com/kjk/common/filerotate"
"github.com/kjk/common/httputil"
"github.com/kjk/common/siserlogger"
)
type op struct {
uri string
mime string
d []byte
}
const (
// how long to wait before we resume sending logs to the server
// after a failure. doesn't affect logging to files
throttleTimeout = time.Second * 15
kPleaseStop = "please-stop"
)
var (
// if true, will compress logs after closing with zstd level 3
// and rename to ${name}.zstd
CompressLogs = false
Server = ""
ApiKey = ""
LogDir = ""
FileLogs *filerotate.File
FileErrors *siserlogger.File
FileEvents *siserlogger.File
FileHits *siserlogger.File
throttleUntil time.Time
ch = make(chan op, 1000)
startLogWorker sync.Once
)
func ctx() context.Context {
return context.Background()
}
func logf(s string, args ...interface{}) {
if len(args) > 0 {
s = fmt.Sprintf(s, args...)
}
fmt.Print(s)
}
func logtasticWorker() {
logf("logtasticWorker started\n")
for op := range ch {
// logfLocal("logtasticPOST %s\n", op.uri)
uri := op.uri
if uri == kPleaseStop {
break
}
d := op.d
mime := op.mime
r := requests.
URL(uri).
BodyBytes(d).
ContentType(mime)
if ApiKey != "" {
r = r.Header("X-Api-Key", ApiKey)
}
ctx, cancel := context.WithTimeout(ctx(), time.Second*10)
err := r.Fetch(ctx)
cancel()
if err != nil {
logf("logtasticPOST %s failed: %v, will throttle for %s\n", uri, err, throttleTimeout)
throttleUntil = time.Now().Add(throttleTimeout)
}
}
logf("logtasticWorker stopped\n")
}
func Stop() {
Server = ""
ch <- op{uri: kPleaseStop}
if FileLogs != nil {
FileLogs.Close()
}
if FileErrors != nil {
FileErrors.Close()
}
if FileEvents != nil {
FileEvents.Close()
}
if FileHits != nil {
FileHits.Close()
}
}
func logtasticPOST(uriPath string, d []byte, mime string) {
if Server == "" {
return
}
startLogWorker.Do(func() {
go logtasticWorker()
})
throttleLeft := time.Until(throttleUntil)
if throttleLeft > 0 {
logf(" skipping because throttling for %s\n", throttleLeft)
return
}
uri := "http://" + Server + uriPath
// logfLocal("logtasticPOST %s\n", uri)
op := op{
uri: uri,
mime: mime,
d: d,
}
select {
case ch <- op:
default:
logf("logtasticPOST %s failed: channel full\n", uri)
}
}
const (
mimeJSON = "application/json"
mimePlainText = "text/plain"
)
func writeLog(d []byte) {
if LogDir == "" {
return
}
if FileLogs == nil {
var err error
FileLogs, err = filerotate.NewDaily(LogDir, "log", nil)
if err != nil {
logf("failed to open log file logs: %v\n", err)
return
}
}
FileLogs.Write2(d, true)
}
func writeSiserLog(name string, lPtr **siserlogger.File, d []byte) {
if LogDir == "" {
return
}
if *lPtr == nil {
l, err := siserlogger.NewDaily(LogDir, name, nil)
if err != nil {
logf("failed to open log file %s: %v\n", name, err)
return
}
*lPtr = l
}
// logf("writeSiserLog %s: %s\n", name, limitString(string(d), 100))
(*lPtr).Write(d)
}
func Log(s string) {
d := []byte(s)
writeLog(d)
logtasticPOST("/api/v1/log", d, mimePlainText)
}
func LogHit(r *http.Request, code int, size int64, dur time.Duration) {
m := map[string]interface{}{}
httputil.GetRequestInfo(r, m)
if dur > 0 {
m["dur_ms"] = float64(dur) / float64(time.Millisecond)
}
if code >= 400 {
m["status"] = code
}
if size > 0 {
m["size"] = size
}
d, _ := json.Marshal(m)
writeSiserLog("hit", &FileHits, d)
logtasticPOST("/api/v1/hit", d, mimeJSON)
}
func LogEvent(r *http.Request, m map[string]interface{}) {
if r != nil {
httputil.GetRequestInfo(r, m)
}
d, _ := json.Marshal(m)
writeSiserLog("event", &FileEvents, d)
logtasticPOST("/api/v1/event", d, mimeJSON)
}
func HandleEvent(w http.ResponseWriter, r *http.Request) {
defer r.Body.Close()
if r.Method != "POST" {
http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
return
}
d, err := io.ReadAll(r.Body)
if err != nil {
logf("failed to read body: %v\n", err)
http.Error(w, "Bad request", http.StatusBadRequest)
return
}
// we validate it's json and agument it with ip of the user's browser
var m map[string]interface{}
err = json.Unmarshal(d, &m)
if err != nil {
logf("HandleEvent: json.Unmarshal() failed with '%s'\nbody:\n%s\n", err, limitString(string(d), 100))
http.Error(w, "Bad request", http.StatusBadRequest)
return
}
LogEvent(r, m)
}
// TODO: send callstack as a separate field
// TODO: send server build hash so we can auto-link callstack lines
// to source code on github
func LogError(r *http.Request, s string) {
writeSiserLog("errors", &FileErrors, []byte(s))
m := map[string]interface{}{}
if r != nil {
httputil.GetRequestInfo(r, m)
}
m["msg"] = s
d, _ := json.Marshal(m)
logtasticPOST("/api/v1/error", d, mimeJSON)
}
func limitString(s string, n int) string {
if len(s) > n {
return s[:n]
}
return s
}