A golang package for http routing, inspired by labstack's Echo and Rust rocket
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package router
import (
// Context is passed to handlers and middlewares
type Context struct {
router *Router
Request *http.Request
Response http.ResponseWriter
Param func(string) string
store map[string]interface{}
// NewContext creates a new context, this function is only exported for use in tests
func NewContext(router *Router, res http.ResponseWriter, req *http.Request, param httprouter.Params) *Context {
return &Context{router, req, res, param.ByName, make(map[string]interface{})}
// QueryParam returns the specified parameter from the query string.
// Returns an empty string if it doesn't exist. Returns the first parameter if multiple instances exist
func (c *Context) QueryParam(param string) string {
params := c.Request.URL.Query()[param]
if params == nil {
return ``
return params[0]
// Redirect sends a redirect to the client
func (c *Context) Redirect(code int, url string) error {
http.Redirect(c.Response, c.Request, url, code)
return nil
// Bytes returns the given status code and writes the bytes to the body
func (c *Context) Bytes(code int, b []byte) error {
_, err := c.Response.Write(b)
return err
// String returns the given status code and writes the string to the body
func (c *Context) String(code int, s string) error {
c.Response.Header().Set(`Content-Type`, `text/plain`)
_, err := c.Response.Write([]byte(s))
return err
// StatusText returns the given status code with the matching status text
func (c *Context) StatusText(code int) error {
return c.String(code, http.StatusText(code))
// NoContent returns the given status code without writing anything to the body
func (c *Context) NoContent(code int) error {
return nil
// JSON returns the given status code and writes JSON to the body
func (c *Context) JSON(code int, data interface{}) error {
c.Response.Header().Set(`Content-Type`, `application/json`)
return json.NewEncoder(c.Response).Encode(data) // TODO: Encode to buffer first to prevent partial responses on error
// Render renders a templating using the Renderer set in router
func (c *Context) Render(code int, template string, data interface{}) error {
if c.router.Renderer == nil {
panic(`Cannot call render without a renderer set`)
var b bytes.Buffer
err := c.router.Renderer.Render(&b, template, data, c)
if err != nil {
return err
c.Response.Header().Set(`Content-Type`, `text/html`)
_, _ = io.Copy(c.Response, &b)
return nil
// Set sets a value in the context. Set is not safe to be used concurrently
func (c *Context) Set(key string, value interface{}) {
c.store[key] = value
// Get retrieves a value from the context.
func (c *Context) Get(key string) interface{} {
return c.store[key]
// RealIP uses proxy headers for the real ip, if none exist the IP of the current connection is returned
func (c *Context) RealIP() string {
if ip := c.Request.Header.Get(`X-Forwarded-For`); ip != `` {
return strings.Split(ip, `, `)[0]
if ip := c.Request.Header.Get(`X-Real-IP`); ip != `` {
return ip
ra, _, _ := net.SplitHostPort(c.Request.RemoteAddr)
return ra