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https://github.com/glassonion1/logz
The logz is Go library for grouping a access log and application logs
https://github.com/glassonion1/logz
go golang grpc http logger logging opentelemetry
Last synced: 2 days ago
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The logz is Go library for grouping a access log and application logs
- Host: GitHub
- URL: https://github.com/glassonion1/logz
- Owner: glassonion1
- License: mit
- Created: 2020-12-05T02:23:15.000Z (almost 4 years ago)
- Default Branch: main
- Last Pushed: 2023-05-22T22:58:58.000Z (over 1 year ago)
- Last Synced: 2024-10-01T19:06:16.644Z (2 days ago)
- Topics: go, golang, grpc, http, logger, logging, opentelemetry
- Language: Go
- Homepage:
- Size: 737 KB
- Stars: 54
- Watchers: 4
- Forks: 4
- Open Issues: 6
-
Metadata Files:
- Readme: README.md
- Funding: .github/FUNDING.yml
- License: LICENSE
Awesome Lists containing this project
README
# Logz - yet another logger library for go
[](https://godoc.org/github.com/glassonion1/logz)
[](https://goreportcard.com/report/github.com/glassonion1/logz)
[](https://github.com/glassonion1/logz/blob/main/LICENSE)
The logz is logger library for grouping application logs related a access log. The logz uses OpenTelemetry([https://opentelemetry.io](https://opentelemetry.io)) to generate the trace id.
This is for Google Cloud Logging (formerly known as Stackdriver Logging).
## Features
* Writes access log each http requests
* Writes application log
* Grouping application logs related a access log.
* The parent entry will inherit the severity of its children
* Supports to App Engine 2nd and Cloud Run and GKE.
Use [go111](https://github.com/glassonion1/logz/tree/main/go111) package if your project is App Engine 1st generation.
### Contribution Packages
The logz contribution packages that provides middlewares for 3rd-party Go packages.
* [gin](https://github.com/glassonion1/logz/tree/main/contrib/github.com/gin-gonic/gin/logzgin)
* [echo](https://github.com/glassonion1/logz/tree/main/contrib/github.com/labstack/echo/logzecho)
* [gRPC](https://github.com/glassonion1/logz/tree/main/contrib/google.golang.org/grpc/logzgrpc)
For more details: [https://github.com/glassonion1/logz/tree/main/contrib](https://github.com/glassonion1/logz/tree/main/contrib)
## Install
```
$ go get github.com/glassonion1/logz
```
## Usage
### Google App Engine Standard
```go
func main() {
mux := http.NewServeMux()
mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
// Writes info log
logz.Infof(ctx, "writes %s log", "info")
})
logz.SetConfig(logz.Config{
NeedsAccessLog: true, // Writes the access log
})
logz.InitTracer()
// Sets the middleware
h := middleware.NetHTTP("tracer name")(mux)
log.Fatal(http.ListenAndServe(":8080", h))
}
```
### Cloud Run
```go
func main() {
mux := http.NewServeMux()
mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
// Writes info log
logz.Infof(ctx, "writes %s log", "info")
})
logz.SetConfig(logz.Config{
ProjectID: "your gcp project id",
NeedsAccessLog: false, // Writes no access log
})
logz.InitTracer()
// Sets the middleware
h := middleware.NetHTTP("tracer name")(mux)
log.Fatal(http.ListenAndServe(":8080", h))
}
```
### GKE
```go
func main() {
mux := http.NewServeMux()
mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
// Writes info log
logz.Infof(ctx, "writes %s log", "info")
})
logz.SetConfig(logz.Config{
ProjectID: "your gcp project id",
NeedsAccessLog: true, // Writes the access log
})
logz.InitTracer()
// Sets the middleware
h := middleware.NetHTTP("tracer name")(mux)
log.Fatal(http.ListenAndServe(":8080", h))
}
```
## Examples
See this sample projects for logz detailed usage
https://github.com/glassonion1/logz/tree/main/example
## How logs are grouped
The logz leverages the grouping feature of GCP Cloud Logging. See following references for more details.
* https://godoc.org/cloud.google.com/go/logging#hdr-Grouping_Logs_by_Request
## Log format
The log format is based on [LogEntry](https://cloud.google.com/logging/docs/reference/v2/rest/v2/LogEntry)'s structured payload
### Application log format
```json
{
"severity":"INFO",
"message":"writes info log",
"time":"2020-12-31T23:59:59.999999999Z",
"logging.googleapis.com/sourceLocation":{
"file":"logger_test.go",
"line":"57",
"function":"github.com/glassonion1/logz/internal/logger_test.TestLoggerWriteApplicationLog.func3"
},
"logging.googleapis.com/trace":"projects/test/traces/00000000000000000000000000000000",
"logging.googleapis.com/spanId":"0000000000000000",
"logging.googleapis.com/trace_sampled":false
}
```
### Access log format
```json
{
"severity":"DEFAULT",
"time":"2020-12-31T23:59:59.999999999Z",
"logging.googleapis.com/trace":"projects/test/traces/a0d3eee13de6a4bbcf291eb444b94f28",
"httpRequest":{
"requestMethod":"GET",
"requestUrl":"/test1",
"requestSize":"0",
"status":200,
"responseSize":"333",
"remoteIp":"192.0.2.1",
"serverIp":"192.168.100.115",
"latencyy":{
"nanos":100,
"seconds":0
},
"protocol":"HTTP/1.1"
}
}
```