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https://github.com/samber/slog-kafka
🚨 slog: Kafka handler
https://github.com/samber/slog-kafka
attribute broker error go golang handler kafka log log-level logger middleware slog structured-logging topic
Last synced: 3 months ago
JSON representation
🚨 slog: Kafka handler
- Host: GitHub
- URL: https://github.com/samber/slog-kafka
- Owner: samber
- License: mit
- Created: 2023-04-30T18:43:38.000Z (over 1 year ago)
- Default Branch: main
- Last Pushed: 2024-05-01T18:40:46.000Z (6 months ago)
- Last Synced: 2024-05-02T01:14:01.937Z (6 months ago)
- Topics: attribute, broker, error, go, golang, handler, kafka, log, log-level, logger, middleware, slog, structured-logging, topic
- Language: Go
- Homepage: https://pkg.go.dev/github.com/samber/slog-kafka/v2
- Size: 99.6 KB
- Stars: 5
- Watchers: 3
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- Funding: .github/FUNDING.yml
- License: LICENSE
Awesome Lists containing this project
- awesome-slog - slog-kafka
README
# slog: Kafka handler
[](https://github.com/samber/slog-kafka/releases)
[](https://pkg.go.dev/github.com/samber/slog-kafka)
[](https://goreportcard.com/report/github.com/samber/slog-kafka)
[](https://codecov.io/gh/samber/slog-kafka)
[](https://github.com/samber/slog-kafka/graphs/contributors)
[](./LICENSE)
A [Kafka](https://kafka.apache.org) 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
**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-kafka/v2
```
**Compatibility**: go >= 1.21
No breaking changes will be made to exported APIs before v3.0.0.
## 💡 Usage
GoDoc: [https://pkg.go.dev/github.com/samber/slog-kafka/v2](https://pkg.go.dev/github.com/samber/slog-kafka/v2)
### Handler options
```go
type Option struct {
// log level (default: debug)
Level slog.Leveler
// Kafka Writer
KafkaWriter *kafka.Writer
Timeout time.Duration // default: 60s
// optional: customize Kafka 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
slogkafka.SourceKey = "source"
slogkafka.ContextKey = "extra"
slogkafka.RequestKey = "request"
slogkafka.ErrorKeys = []string{"error", "err"}
slogkafka.RequestIgnoreHeaders = false
```
### Supported attributes
The following attributes are interpreted by `slogkafka.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"
slogkafka "github.com/samber/slog-kafka/v2"
"github.com/segmentio/kafka-go"
"log/slog"
)
func main() {
// docker-compose up -d
uri := "127.0.0.1:9092"
dialer := &kafka.Dialer{
Timeout: 10 * time.Second,
DualStack: true,
}
conn, err := dialer.DialContext(context.Background(), "tcp", uri)
if err != nil {
panic(err)
}
err = conn.CreateTopics(kafka.TopicConfig{
Topic: "logs",
NumPartitions: 12,
ReplicationFactor: 1,
})
if err != nil {
panic(err)
}
writer := kafka.NewWriter(kafka.WriterConfig{
Brokers: []string{uri},
Topic: "logs",
Dialer: dialer,
Async: true, // !
Balancer: &kafka.Hash{},
MaxAttempts: 3,
Logger: kafka.LoggerFunc(func(msg string, args ...interface{}) {
fmt.Printf(msg+"\n", args...)
}),
ErrorLogger: kafka.LoggerFunc(func(msg string, args ...interface{}) {
fmt.Printf(msg+"\n", args...)
}),
})
defer writer.Close()
defer conn.Close()
logger := slog.New(slogkafka.Option{Level: slog.LevelDebug, KafkaWriter: writer}.NewKafkaHandler())
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")
}
```
Kafka message:
```json
{
"level": "ERROR",
"logger": "samber/slog-kafka",
"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 (
slogkafka "github.com/samber/slog-kafka"
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(
slogkafka.Option{
// ...
AttrFromContext: []func(ctx context.Context) []slog.Attr{
slogotel.ExtractOtelAttrFromContext([]string{"tracing"}, "trace_id", "span_id"),
},
}.NewKafkaHandler(),
)
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-kafka)
- Fix [open issues](https://github.com/samber/slog-kafka/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.