A NATS Handler for slog Go library.
See also:
- slog-multi:
slog.Handler
chaining, fanout, routing, failover, load balancing... - slog-formatter:
slog
attribute formatting - slog-sampling:
slog
sampling policy
HTTP middlewares:
- slog-gin: Gin middleware for
slog
logger - slog-echo: Echo middleware for
slog
logger - slog-fiber: Fiber middleware for
slog
logger - slog-chi: Chi middleware for
slog
logger - slog-http:
net/http
middleware forslog
logger
Loggers:
- slog-zap: A
slog
handler forZap
- slog-zerolog: A
slog
handler forZerolog
- slog-logrus: A
slog
handler forLogrus
Log sinks:
- slog-datadog: A
slog
handler forDatadog
- slog-betterstack: A
slog
handler forBetterstack
- slog-rollbar: A
slog
handler forRollbar
- slog-loki: A
slog
handler forLoki
- slog-sentry: A
slog
handler forSentry
- slog-syslog: A
slog
handler forSyslog
- slog-logstash: A
slog
handler forLogstash
- slog-fluentd: A
slog
handler forFluentd
- slog-graylog: A
slog
handler forGraylog
- slog-quickwit: A
slog
handler forQuickwit
- slog-slack: A
slog
handler forSlack
- slog-telegram: A
slog
handler forTelegram
- slog-mattermost: A
slog
handler forMattermost
- slog-microsoft-teams: A
slog
handler forMicrosoft Teams
- slog-webhook: A
slog
handler forWebhook
- slog-kafka: A
slog
handler forKafka
- slog-nats: A
slog
handler forNATS
- slog-parquet: A
slog
handler forParquet
+Object Storage
- slog-channel: A
slog
handler for Go channels
go get github.com/samber/slog-nats
Compatibility: go >= 1.21
No breaking changes will be made to exported APIs before v1.0.0.
GoDoc: https://pkg.go.dev/github.com/samber/slog-nats
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:
slognats.SourceKey = "source"
slognats.ContextKey = "extra"
slognats.RequestKey = "request"
slognats.ErrorKeys = []string{"error", "err"}
slognats.RequestIgnoreHeaders = false
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:
slog.Group("user",
slog.String("id", "user-123"),
slog.String("username", "samber"),
slog.Time("created_at", time.Now()),
)
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:
{
"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"
}
}
Import the samber/slog-otel library.
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")
}
- Ping me on twitter @samuelberthe (DMs, mentions, whatever :))
- Fork the project
- Fix open issues or request new features
Don't hesitate ;)
# Install some dev dependencies
make tools
# Run tests
make test
# or
make watch-test
Give a โญ๏ธ if this project helped you!
Copyright ยฉ 2023 Samuel Berthe.
This project is MIT licensed.