treemux/request.go at master · uptrace/treemux · GitHub

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package treemux

import (
	"context"
	"net/http"
	"strconv"
)

type Request struct {
	*http.Request
	ctx context.Context

	route  string
	params Params
}

func NewRequest(req *http.Request) Request {
	return Request{
		ctx:     req.Context(),
		Request: req,
	}
}

func (req Request) Context() context.Context {
	return req.ctx
}

func (req Request) WithContext(ctx context.Context) Request {
	req.ctx = ctx
	return req
}

func (req Request) WithParams(params Params) Request {
	req.params = params
	return req
}

func (req Request) Route() string {
	return req.route
}

func (req Request) Params() Params {
	return req.params
}

func (req Request) Param(key string) string {
	return req.params.Text(key)
}

//------------------------------------------------------------------------------

type Param struct {
	Name  string
	Value string
}

type Params []Param

func (ps Params) Get(name string) (string, bool) {
	for _, param := range ps {
		if param.Name == name {
			return param.Value, true
		}
	}
	return "", false
}

func (ps Params) Text(name string) string {
	s, _ := ps.Get(name)
	return s
}

func (ps Params) Uint32(name string) (uint32, error) {
	n, err := strconv.ParseUint(ps.Text(name), 10, 32)
	return uint32(n), err
}

func (ps Params) Uint64(name string) (uint64, error) {
	return strconv.ParseUint(ps.Text(name), 10, 64)
}

func (ps Params) Int32(name string) (int32, error) {
	n, err := strconv.ParseInt(ps.Text(name), 10, 32)
	return int32(n), err
}

func (ps Params) Int64(name string) (int64, error) {
	return strconv.ParseInt(ps.Text(name), 10, 64)
}

func (ps Params) Map() map[string]string {
	if len(ps) == 0 {
		return nil
	}
	m := make(map[string]string, len(ps))
	for _, param := range ps {
		m[param.Name] = param.Value
	}
	return m
}

//------------------------------------------------------------------------------

type routeCtxKey struct{}

func RouteFromContext(ctx context.Context) *RouteInfo {
	route, _ := ctx.Value(routeCtxKey{}).(*RouteInfo)
	return route
}

func contextWithRoute(ctx context.Context, route string, params Params) context.Context {
	return context.WithValue(ctx, routeCtxKey{}, &RouteInfo{
		name:   route,
		params: params,
	})
}

type RouteInfo struct {
	name   string
	params Params // exported so users can change params
}

func (r *RouteInfo) Name() string {
	return r.name
}

func (r *RouteInfo) Params() Params {
	return r.params
}

func (r *RouteInfo) Param(name string) string {
	return r.params.Text(name)
}