https://github.com/samber/slog-nats
🚨 slog: NATS handler
https://github.com/samber/slog-nats
attribute broker error go golang handler log log-level logger middleware nats publisher queue slog structured-logging topic
Last synced: about 1 month ago
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🚨 slog: NATS handler
- Host: GitHub
- URL: https://github.com/samber/slog-nats
- Owner: samber
- License: mit
- Created: 2023-11-27T10:09:10.000Z (over 1 year ago)
- Default Branch: main
- Last Pushed: 2024-05-01T18:40:45.000Z (about 1 year ago)
- Last Synced: 2024-05-02T01:14:01.948Z (about 1 year ago)
- Topics: attribute, broker, error, go, golang, handler, log, log-level, logger, middleware, nats, publisher, queue, slog, structured-logging, topic
- Language: Go
- Homepage: https://pkg.go.dev/github.com/samber/slog-nats
- Size: 46.9 KB
- Stars: 5
- Watchers: 3
- Forks: 1
- Open Issues: 2
-
Metadata Files:
- Readme: README.md
- Funding: .github/FUNDING.yml
- License: LICENSE
Awesome Lists containing this project
README
# slog: NATS handler
[](https://github.com/samber/slog-nats/releases)
[](https://pkg.go.dev/github.com/samber/slog-nats)
[](https://goreportcard.com/report/github.com/samber/slog-nats)
[](https://codecov.io/gh/samber/slog-nats)
[](https://github.com/samber/slog-nats/graphs/contributors)
[](./LICENSE)
A [NATS](https://nats.io/) Handler for [slog](https://pkg.go.dev/log/slog) Go library.
Sponsored by:
Cloud-native search engine for observability - An OSS alternative to Splunk, Elasticsearch, Loki, and Tempo.
**See also:**
- [slog-multi](https://github.com/samber/slog-multi): `slog.Handler` chaining, fanout, routing, failover, load balancing...
- [slog-formatter](https://github.com/samber/slog-formatter): `slog` attribute formatting
- [slog-sampling](https://github.com/samber/slog-sampling): `slog` sampling policy
- [slog-mock](https://github.com/samber/slog-mock): `slog.Handler` for test purposes
**HTTP middlewares:**
- [slog-gin](https://github.com/samber/slog-gin): Gin middleware for `slog` logger
- [slog-echo](https://github.com/samber/slog-echo): Echo middleware for `slog` logger
- [slog-fiber](https://github.com/samber/slog-fiber): Fiber middleware for `slog` logger
- [slog-chi](https://github.com/samber/slog-chi): Chi middleware for `slog` logger
- [slog-http](https://github.com/samber/slog-http): `net/http` middleware for `slog` logger
**Loggers:**
- [slog-zap](https://github.com/samber/slog-zap): A `slog` handler for `Zap`
- [slog-zerolog](https://github.com/samber/slog-zerolog): A `slog` handler for `Zerolog`
- [slog-logrus](https://github.com/samber/slog-logrus): A `slog` handler for `Logrus`
**Log sinks:**
- [slog-datadog](https://github.com/samber/slog-datadog): A `slog` handler for `Datadog`
- [slog-betterstack](https://github.com/samber/slog-betterstack): A `slog` handler for `Betterstack`
- [slog-rollbar](https://github.com/samber/slog-rollbar): A `slog` handler for `Rollbar`
- [slog-loki](https://github.com/samber/slog-loki): A `slog` handler for `Loki`
- [slog-sentry](https://github.com/samber/slog-sentry): A `slog` handler for `Sentry`
- [slog-syslog](https://github.com/samber/slog-syslog): A `slog` handler for `Syslog`
- [slog-logstash](https://github.com/samber/slog-logstash): A `slog` handler for `Logstash`
- [slog-fluentd](https://github.com/samber/slog-fluentd): A `slog` handler for `Fluentd`
- [slog-graylog](https://github.com/samber/slog-graylog): A `slog` handler for `Graylog`
- [slog-quickwit](https://github.com/samber/slog-quickwit): A `slog` handler for `Quickwit`
- [slog-slack](https://github.com/samber/slog-slack): A `slog` handler for `Slack`
- [slog-telegram](https://github.com/samber/slog-telegram): A `slog` handler for `Telegram`
- [slog-mattermost](https://github.com/samber/slog-mattermost): A `slog` handler for `Mattermost`
- [slog-microsoft-teams](https://github.com/samber/slog-microsoft-teams): A `slog` handler for `Microsoft Teams`
- [slog-webhook](https://github.com/samber/slog-webhook): A `slog` handler for `Webhook`
- [slog-kafka](https://github.com/samber/slog-kafka): A `slog` handler for `Kafka`
- [slog-nats](https://github.com/samber/slog-nats): A `slog` handler for `NATS`
- [slog-parquet](https://github.com/samber/slog-parquet): A `slog` handler for `Parquet` + `Object Storage`
- [slog-channel](https://github.com/samber/slog-channel): A `slog` handler for Go channels
## 🚀 Install
```sh
go get github.com/samber/slog-nats
```
**Compatibility**: go >= 1.21
No breaking changes will be made to exported APIs before v1.0.0.
## 💡 Usage
GoDoc: [https://pkg.go.dev/github.com/samber/slog-nats](https://pkg.go.dev/github.com/samber/slog-nats)
### Handler options
```go
type Option struct {
// log level (default: debug)
Level slog.Leveler
// NATS client
EncodedConnection *nats.EncodedConn
Subject string
// optional: customize NATS event builder
Converter Converter
// optional: fetch attributes from context
AttrFromContext []func(ctx context.Context) []slog.Attr
// optional: see slog.HandlerOptions
AddSource bool
ReplaceAttr func(groups []string, a slog.Attr) slog.Attr
}
```
Other global parameters:
```go
slognats.SourceKey = "source"
slognats.ContextKey = "extra"
slognats.RequestKey = "request"
slognats.ErrorKeys = []string{"error", "err"}
slognats.RequestIgnoreHeaders = false
```
### Supported attributes
The following attributes are interpreted by `slognats.DefaultConverter`:
| Atribute name | `slog.Kind` | Underlying type |
| ---------------- | ----------------- | --------------- |
| "user" | group (see below) | |
| "error" | any | `error` |
| "request" | any | `*http.Request` |
| other attributes | * | |
Other attributes will be injected in `extra` field.
Users must be of type `slog.Group`. Eg:
```go
slog.Group("user",
slog.String("id", "user-123"),
slog.String("username", "samber"),
slog.Time("created_at", time.Now()),
)
```
### Example
```go
import (
"context"
"fmt"
"time"
slognats "github.com/samber/slog-nats"
"github.com/nats-io/nats.go"
"log/slog"
)
func main() {
// docker-compose up -d
// brew tap nats-io/nats-tools
// brew install nats-io/nats-tools/nats
// nats subscribe test
uri := "nats://127.0.0.1:4222"
nc, err := nats.Connect(uri)
if err != nil {
panic(err)
}
ec, err := nats.NewEncodedConn(nc, nats.JSON_ENCODER)
if err != nil {
panic(err)
}
defer nc.Flush()
defer nc.Close()
logger := slog.New(slognats.Option{Level: slog.LevelDebug, EncodedConnection: ec, Subject: "test"}.NewNATSHandler())
logger = logger.With("release", "v1.0.0")
logger.
With(
slog.Group("user",
slog.String("id", "user-123"),
slog.Time("created_at", time.Now()),
),
).
With("error", fmt.Errorf("an error")).
Error("a message")
}
```
NATS message:
```json
{
"level": "ERROR",
"logger.name": "samber/slog-nats",
"logger.version": "1.0.0",
"message": "a message",
"timestamp": "2023-04-30T01:33:21.676768Z",
"error": {
"error": "an error",
"kind": "*errors.errorString",
"stack": null
},
"extra": {
"release": "v1.0.0"
},
"user": {
"created_at": "2023-04-30T01:33:21.676704Z",
"id": "user-123"
}
}
```
### Tracing
Import the samber/slog-otel library.
```go
import (
slognats "github.com/samber/slog-nats"
slogotel "github.com/samber/slog-otel"
"go.opentelemetry.io/otel/sdk/trace"
)
func main() {
tp := trace.NewTracerProvider(
trace.WithSampler(trace.AlwaysSample()),
)
tracer := tp.Tracer("hello/world")
ctx, span := tracer.Start(context.Background(), "foo")
defer span.End()
span.AddEvent("bar")
logger := slog.New(
slognats.Option{
// ...
AttrFromContext: []func(ctx context.Context) []slog.Attr{
slogotel.ExtractOtelAttrFromContext([]string{"tracing"}, "trace_id", "span_id"),
},
}.NewNATSHandler(),
)
logger.ErrorContext(ctx, "a message")
}
```
## 🤝 Contributing
- Ping me on twitter [@samuelberthe](https://twitter.com/samuelberthe) (DMs, mentions, whatever :))
- Fork the [project](https://github.com/samber/slog-nats)
- Fix [open issues](https://github.com/samber/slog-nats/issues) or request new features
Don't hesitate ;)
```bash
# Install some dev dependencies
make tools
# Run tests
make test
# or
make watch-test
```
## 👤 Contributors
## 💫 Show your support
Give a ⭐️ if this project helped you!
[](https://github.com/sponsors/samber)
## 📝 License
Copyright © 2023 [Samuel Berthe](https://github.com/samber).
This project is [MIT](./LICENSE) licensed.