Timing

import "github.com/go-mizu/mizu/middlewares/timing"

app := mizu.New()
app.Use(timing.New())

app.Use(timing.New())

app.Get("/", func(c *mizu.Ctx) error {
    // Total time is automatically tracked
    return c.JSON(200, data)
})
// Response header: Server-Timing: total;dur=12.34

app.Get("/users", func(c *mizu.Ctx) error {
    // Track database query time
    start := time.Now()
    users, err := db.GetUsers()
    timing.Add(c, "db", time.Since(start), "Database query")

    // Track serialization time
    start = time.Now()
    data := serialize(users)
    timing.Add(c, "serialize", time.Since(start), "JSON serialization")

    return c.JSON(200, data)
})
// Server-Timing: total;dur=45.67, db;dur=30.12;desc="Database query", serialize;dur=5.23;desc="JSON serialization"

app.Get("/data", func(c *mizu.Ctx) error {
    // Start a timing measurement
    stop := timing.Start(c, "external_api")

    resp, err := http.Get("https://api.example.com/data")
    if err != nil {
        return err
    }
    defer resp.Body.Close()

    // Stop and record with description
    stop("External API call")

    return c.JSON(200, resp.Body)
})

app.Get("/compute", func(c *mizu.Ctx) error {
    var result int

    // Track a function call
    timing.Track(c, "calculation", func() {
        result = expensiveCalculation()
    })

    return c.JSON(200, map[string]int{"result": result})
})

app.Get("/dashboard", func(c *mizu.Ctx) error {
    // Track multiple operations
    stopAuth := timing.Start(c, "auth")
    user := authenticateUser(c)
    stopAuth("Authentication")

    stopData := timing.Start(c, "data")
    dashboard := loadDashboard(user.ID)
    stopData("Load dashboard data")

    stopRender := timing.Start(c, "render")
    html := renderTemplate(dashboard)
    stopRender("Template rendering")

    return c.HTML(200, html)
})
// Server-Timing: total;dur=120.50, auth;dur=15.20;desc="Authentication", data;dur=80.30;desc="Load dashboard data", render;dur=25.00;desc="Template rendering"

func New() mizu.Middleware
func Add(c *mizu.Ctx, name string, duration time.Duration, description string)
func Start(c *mizu.Ctx, name string) func(description string)
func Track(c *mizu.Ctx, name string, fn func())

Server-Timing: <name>;dur=<milliseconds>;desc="<description>"

Server-Timing: total;dur=150.00, db;dur=45.20;desc="Query users", cache;dur=2.10;desc="Redis lookup"