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samber/slog-mock: 🚨 slog: mock handler

A mock Handler for slog Go library. Used for testing purpose.

See also:

slog-multi: slog.Handler chaining, fanout, routing, failover, load balancing...
slog-formatter: slog attribute formatting
slog-sampling: slog sampling policy
slog-mock: slog.Handler for test purposes

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 for slog logger

Loggers:

slog-zap: A slog handler for Zap
slog-zerolog: A slog handler for Zerolog
slog-logrus: A slog handler for Logrus

Log sinks:

slog-datadog: A slog handler for Datadog
slog-betterstack: A slog handler for Betterstack
slog-rollbar: A slog handler for Rollbar
slog-loki: A slog handler for Loki
slog-sentry: A slog handler for Sentry
slog-syslog: A slog handler for Syslog
slog-logstash: A slog handler for Logstash
slog-fluentd: A slog handler for Fluentd
slog-graylog: A slog handler for Graylog
slog-quickwit: A slog handler for Quickwit
slog-slack: A slog handler for Slack
slog-telegram: A slog handler for Telegram
slog-mattermost: A slog handler for Mattermost
slog-microsoft-teams: A slog handler for Microsoft Teams
slog-webhook: A slog handler for Webhook
slog-kafka: A slog handler for Kafka
slog-nats: A slog handler for NATS
slog-parquet: A slog handler for Parquet + Object Storage
slog-channel: A slog handler for Go channels

go get github.com/samber/slog-mock

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-mock

type Option struct {
	// optional
	Enabled func(ctx context.Context, level slog.Level) bool
	// optional
	Handle  func(ctx context.Context, record slog.Record) error
}

import (
	"fmt"
	"net/http"
	"time"

	slogmock "github.com/samber/slog-mock"

	"log/slog"
)

func main() {
	logger := slog.New(
		slogmock.Option{
			Handle: func(ctx context.Context, record slog.Record) error {
				// simulate slowdown then error from log sink
				time.Sleep(100*time.Millisecond)
				panic("could not connect to datadog")
			},
		}.NewMockHandler(),
	)
	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", slog.Int("count", 1))
}

Ping me on Twitter @samuelberthe (DMs, mentions, whatever :))
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# Install some dev dependencies
make tools

# Run tests
make test
# or
make watch-test

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This project is MIT licensed.

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