MessagePack Request

Learn how to handle MessagePack requests in Iris.

Basic MessagePack Handling

package main

import "github.com/kataras/iris/v12"

type User struct {
    ID    int    `msgpack:"id"`
    Name  string `msgpack:"name"`
    Email string `msgpack:"email"`
}

func main() {
    app := iris.New()

    app.Post("/msgpack", func(ctx iris.Context) {
        var user User
        if err := ctx.ReadMsgPack(&user); err != nil {
            ctx.StopWithError(iris.StatusBadRequest, err)
            return
        }

        ctx.JSON(iris.Map{
            "received": user,
        })
    })

    app.Listen(":8080")
}

MessagePack Validation

type Product struct {
    ID    int     `msgpack:"id" validate:"required"`
    Name  string  `msgpack:"name" validate:"required"`
    Price float64 `msgpack:"price" validate:"required,gte=0"`
    Stock int     `msgpack:"stock" validate:"required,gte=0"`
}

app.Post("/validate", func(ctx iris.Context) {
    var product Product
    if err := ctx.ReadMsgPack(&product); err != nil {
        ctx.StopWithError(iris.StatusBadRequest, err)
        return
    }

    if err := validate.Struct(product); err != nil {
        ctx.StopWithProblem(iris.StatusBadRequest, iris.NewProblem().
            Title("Validation Error").
            DetailErr(err))
        return
    }

    ctx.JSON(iris.Map{
        "message": "MessagePack validated successfully",
        "product": product,
    })
})

Custom MessagePack Handling

app.Post("/custom", func(ctx iris.Context) {
    data := ctx.GetBody()
    var result interface{}

    if err := msgpack.Unmarshal(data, &result); err != nil {
        ctx.StopWithError(iris.StatusBadRequest, err)
        return
    }

    ctx.JSON(iris.Map{
        "data": result,
    })
})

Best Practices

1. Schema:

   • Use proper tags
   • Define clear types
   • Handle versioning
   • Document fields
   • Manage updates

2. Validation:

   • Validate required fields
   • Check types
   • Handle defaults
   • Set limits
   • Document requirements

3. Performance:

   • Use appropriate buffer
   • Handle large messages
   • Monitor memory
   • Implement timeouts
   • Clean resources

4. Error Handling:

   • Handle parsing errors
   • Validate messages
   • Log issues
   • Document errors
   • Test edge cases