golang フレームワークのログとトレースを使用したデバッグ

import (
    "log"
)

func ExampleLog() {
    log.Println("Starting the application")
    log.Fatal("Application failed to start")
}

import (
    "github.com/rs/zerolog"
)

func ExampleZerolog() {
    logger := zerolog.New(os.Stdout).With().Timestamp().Logger()
    logger.Info().Str("event", "started").Msg("Application started")
    logger.Error().Str("error", "timeout").Msg("Request timed out")
}

import (
    "context"
    "fmt"
    "github.com/google/uuid"
)

func ExampleTrace() {
    ctx := context.Background()
    tr := trace.Start(ctx, "my-trace-id")
    defer tr.Finish()

    tr.Log(trace.Event{
        Message: "Start processing request",
        Severity: trace.Info,
    })
}

log.Println("Starting database query")
err := db.Query("SELECT * FROM users")
if err != nil {
    log.Fatal(err)
}

tr := trace.Start(ctx, "database-query")
defer tr.Finish()

tr.Log(trace.Event{
    Message: "Start database query",
    Severity: trace.Info,
})

defer func() {
    finished := tr.Finished()
    finished.Status = trace.StatusTimeout
    finished.EndTime = message.Timestamp
}