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Published: Sep 9, 2022 License: Apache-2.0 Imports: 10 Imported by: 15



Host("localhost") && Method(http.MethodPost) && Path("/v1")
Host("localhost") && Method(http.MethodPost) && Path("/v1") && Header("Content-Type", "application/<string>")

HTTP request routing language and library.


  • Trie based matching
  • Regexp based matching
  • Matches hosts, headers, methods and paths
  • Flexible matching language




Package route provides http package-compatible routing library. It can route http requests by hostname, method, path and headers.

Route defines simple language for matching requests based on Go syntax. Route provides series of matchers that follow the syntax:

Matcher("value")          // matches value using trie
Matcher("<string>.value") // uses trie-based matching for a.value and b.value
MatcherRegexp(".*value")  // uses regexp-based matching

Host matcher:

Host("<subdomain>.localhost") // trie-based matcher for a.localhost, b.localhost, etc.
HostRegexp(".*localhost")     // regexp based matcher

Path matcher:

Path("/hello/<value>")   // trie-based matcher for raw request path
PathRegexp("/hello/.*")  // regexp-based matcher for raw request path

Method matcher:

Method("GET")            // trie-based matcher for request method
MethodRegexp("POST|PUT") // regexp based matcher for request method

Header matcher:

Header("Content-Type", "application/<subtype>") // trie-based matcher for headers
HeaderRegexp("Content-Type", "application/.*")  // regexp based matcher for headers

Matchers can be combined using && operator:

Host("localhost") && Method("POST") && Path("/v1")

Route library will join the trie-based matchers into one trie matcher when possible, for example:

Host("localhost") && Method("POST") && Path("/v1")
Host("localhost") && Method("GET") && Path("/v2")

Will be combined into one trie for performance. If you add a third route:

Host("localhost") && Method("GET") && PathRegexp("/v2/.*")

It wont be joined ito the trie, and would be matched separately instead.



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func IsValid

func IsValid(expr string) bool

IsValid checks whether expression is valid


type Mux

type Mux struct {
	// contains filtered or unexported fields

Mux implements router compatible with http.Handler

func NewMux

func NewMux() *Mux

NewMux returns new Mux router

func (*Mux) AddAlias

func (m *Mux) AddAlias(match, replace string)

AddAlias adds an alias for matchers in an expression. If the string in `match` matches any part of an expression added via `Mux.Handle()` then the match is replaced with the value of `alias`.

func (*Mux) GetNotFound

func (m *Mux) GetNotFound() http.Handler

func (*Mux) Handle

func (m *Mux) Handle(expr string, handler http.Handler) error

Handle adds http handler for route expression

func (*Mux) HandleFunc

func (m *Mux) HandleFunc(expr string, handler func(http.ResponseWriter, *http.Request)) error

HandleFunc adds http handler function for route expression

func (*Mux) InitHandlers

func (m *Mux) InitHandlers(handlers map[string]interface{}) error

InitHandlers This adds a map of handlers and expressions in a single call. This allows init to load many rules on first startup, thus reducing the time it takes to create the initial mux.

func (*Mux) IsValid

func (m *Mux) IsValid(expr string) bool

func (*Mux) Remove

func (m *Mux) Remove(expr string) error

func (*Mux) ServeHTTP

func (m *Mux) ServeHTTP(w http.ResponseWriter, r *http.Request)

ServeHTTP routes the request and passes it to handler

func (*Mux) SetNotFound

func (m *Mux) SetNotFound(n http.Handler) error

type Router

type Router interface {
	// GetRoute returns a route by a given expression, returns nil if expression is not found
	GetRoute(string) interface{}

	// AddRoute adds a route to match by expression,
	// returns error if the expression already defined, or route expression is incorrect
	AddRoute(string, interface{}) error

	// RemoveRoute removes a route for a given expression
	RemoveRoute(string) error

	// UpsertRoute updates an existing route or adds a new route by given expression
	UpsertRoute(string, interface{}) error

	// InitRoutes Initializes the routes,
	// this method clobbers all existing routes and should only be called during init
	InitRoutes(map[string]interface{}) error

	// Route takes a request and matches it against requests, returns matched route in case if found,
	// nil if there's no matching route or error in case of internal error.
	Route(*http.Request) (interface{}, error)

Router implements http request routing and operations. It is a generic router not conforming to http.Handler interface, to get a handler conforming to http.Handler interface, use Mux router instead.

func New

func New() Router

New creates a new Router instance

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