Logging

2024-01-15 10:30:45 User 123 logged in from 192.168.1.1

{"time":"2024-01-15T10:30:45Z","level":"INFO","msg":"user logged in","user_id":123,"ip":"192.168.1.1"}

app := mizu.New()  // Logger middleware included

INFO request status=200 method=GET path=/users duration_ms=12 remote_ip=127.0.0.1

func getUser(c *mizu.Ctx) error {
    id := c.Param("id")

    c.Logger().Info("fetching user", "user_id", id)

    user, err := database.FindUser(id)
    if err != nil {
        c.Logger().Error("database error", "error", err, "user_id", id)
        return err
    }

    c.Logger().Debug("user found", "user_id", id, "name", user.Name)
    return c.JSON(200, user)
}

c.Logger().Debug("checking cache", "key", cacheKey)
c.Logger().Info("user logged in", "user_id", userID)
c.Logger().Warn("cache miss", "key", cacheKey)
c.Logger().Error("payment failed", "error", err, "order_id", orderID)

app.Use(mizu.Logger(mizu.LoggerOptions{
    Mode:            mizu.Dev,          // Output format
    Color:           true,              // Colored output
    Logger:          customLogger,      // Custom slog.Logger
    RequestIDHeader: "X-Request-Id",    // Header name for request ID
    UserAgent:       true,              // Include User-Agent in logs
    Output:          os.Stderr,         // Where to write logs
}))

// Development: colored text output
app.Use(mizu.Logger(mizu.LoggerOptions{
    Mode:  mizu.Dev,
    Color: true,
}))

// Production: JSON for log aggregators
app.Use(mizu.Logger(mizu.LoggerOptions{
    Mode: mizu.Prod,
}))

import "log/slog"

// Create a custom logger
logger := slog.New(slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{
    Level: slog.LevelDebug,
}))

// Set it on the app
app.SetLogger(logger)

app.Use(mizu.Logger(mizu.LoggerOptions{
    RequestIDHeader: "X-Request-Id",  // Use this header
}))

10:30:45 INFO request status=200 method=GET path=/users duration_ms=12 request_id=abc123
10:30:45 INFO fetching user user_id=42
10:30:45 INFO request status=200 method=GET path=/users/42 duration_ms=8 request_id=def456

{"time":"2024-01-15T10:30:45Z","level":"INFO","msg":"request","status":200,"method":"GET","path":"/users","duration_ms":12,"request_id":"abc123"}