echo

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Published: Dec 2, 2016 License: MIT Imports: 26 Imported by: 0

README

[Echo] (https://echo.labstack.com) GoDoc License Build Status Coverage Status Twitter

Feature Overview

  • Optimized HTTP router which smartly prioritize routes
  • Build robust and scalable RESTful APIs
  • Group APIs
  • Extensible middleware framework
  • Define middleware at root, group or route level
  • Data binding for JSON, XML and form payload
  • Handy functions to send variety of HTTP responses
  • Centralized HTTP error handling
  • Template rendering with any template engine
  • Define your format for the logger
  • Highly customizable
  • Automatic TLS via Let’s Encrypt
  • HTTP/2 support
  • Built-in graceful shutdown

Performance

Performance

Get Started

Support Us

Contribute

Use issues for everything

  • Report issues
  • Discuss on chat before sending a pull request
  • Suggest new features or enhancements
  • Improve/fix documentation

Credits

License

MIT

Documentation

Overview

Package echo implements high performance, minimalist Go web framework.

Example:

package main

import (
  "net/http"

  "github.com/labstack/echo"
  "github.com/labstack/echo/middleware"
)

// Handler
func hello(c echo.Context) error {
  return c.String(http.StatusOK, "Hello, World!")
}

func main() {
  // Echo instance
  e := echo.New()

  // Middleware
  e.Use(middleware.Logger())
  e.Use(middleware.Recover())

  // Routes
  e.GET("/", hello)

  // Start server
  e.Logger.Fatal(e.Start(":1323"))
}

Learn more at https://echo.labstack.com

Index

Constants

View Source
const (
	CONNECT = "CONNECT"
	DELETE  = "DELETE"
	GET     = "GET"
	HEAD    = "HEAD"
	OPTIONS = "OPTIONS"
	PATCH   = "PATCH"
	POST    = "POST"
	PUT     = "PUT"
	TRACE   = "TRACE"
)

HTTP methods

View Source
const (
	MIMEApplicationJSON                  = "application/json"
	MIMEApplicationJSONCharsetUTF8       = MIMEApplicationJSON + "; " + charsetUTF8
	MIMEApplicationJavaScript            = "application/javascript"
	MIMEApplicationJavaScriptCharsetUTF8 = MIMEApplicationJavaScript + "; " + charsetUTF8
	MIMEApplicationXML                   = "application/xml"
	MIMEApplicationXMLCharsetUTF8        = MIMEApplicationXML + "; " + charsetUTF8
	MIMEApplicationForm                  = "application/x-www-form-urlencoded"
	MIMEApplicationProtobuf              = "application/protobuf"
	MIMEApplicationMsgpack               = "application/msgpack"
	MIMETextHTML                         = "text/html"
	MIMETextHTMLCharsetUTF8              = MIMETextHTML + "; " + charsetUTF8
	MIMETextPlain                        = "text/plain"
	MIMETextPlainCharsetUTF8             = MIMETextPlain + "; " + charsetUTF8
	MIMEMultipartForm                    = "multipart/form-data"
	MIMEOctetStream                      = "application/octet-stream"
)

MIME types

View Source
const (
	HeaderAcceptEncoding                = "Accept-Encoding"
	HeaderAllow                         = "Allow"
	HeaderAuthorization                 = "Authorization"
	HeaderContentDisposition            = "Content-Disposition"
	HeaderContentEncoding               = "Content-Encoding"
	HeaderContentLength                 = "Content-Length"
	HeaderContentType                   = "Content-Type"
	HeaderCookie                        = "Cookie"
	HeaderSetCookie                     = "Set-Cookie"
	HeaderIfModifiedSince               = "If-Modified-Since"
	HeaderLastModified                  = "Last-Modified"
	HeaderLocation                      = "Location"
	HeaderUpgrade                       = "Upgrade"
	HeaderVary                          = "Vary"
	HeaderWWWAuthenticate               = "WWW-Authenticate"
	HeaderXForwardedProto               = "X-Forwarded-Proto"
	HeaderXHTTPMethodOverride           = "X-HTTP-Method-Override"
	HeaderXForwardedFor                 = "X-Forwarded-For"
	HeaderXRealIP                       = "X-Real-IP"
	HeaderServer                        = "Server"
	HeaderOrigin                        = "Origin"
	HeaderAccessControlRequestMethod    = "Access-Control-Request-Method"
	HeaderAccessControlRequestHeaders   = "Access-Control-Request-Headers"
	HeaderAccessControlAllowOrigin      = "Access-Control-Allow-Origin"
	HeaderAccessControlAllowMethods     = "Access-Control-Allow-Methods"
	HeaderAccessControlAllowHeaders     = "Access-Control-Allow-Headers"
	HeaderAccessControlAllowCredentials = "Access-Control-Allow-Credentials"
	HeaderAccessControlExposeHeaders    = "Access-Control-Expose-Headers"
	HeaderAccessControlMaxAge           = "Access-Control-Max-Age"

	// Security
	HeaderStrictTransportSecurity = "Strict-Transport-Security"
	HeaderXContentTypeOptions     = "X-Content-Type-Options"
	HeaderXXSSProtection          = "X-XSS-Protection"
	HeaderXFrameOptions           = "X-Frame-Options"
	HeaderContentSecurityPolicy   = "Content-Security-Policy"
	HeaderXCSRFToken              = "X-CSRF-Token"
)

Headers

Variables

View Source
var (
	ErrUnsupportedMediaType        = NewHTTPError(http.StatusUnsupportedMediaType)
	ErrNotFound                    = NewHTTPError(http.StatusNotFound)
	ErrUnauthorized                = NewHTTPError(http.StatusUnauthorized)
	ErrMethodNotAllowed            = NewHTTPError(http.StatusMethodNotAllowed)
	ErrStatusRequestEntityTooLarge = NewHTTPError(http.StatusRequestEntityTooLarge)
	ErrRendererNotRegistered       = errors.New("renderer not registered")
	ErrInvalidRedirectCode         = errors.New("invalid redirect status code")
	ErrCookieNotFound              = errors.New("cookie not found")
)

Errors

View Source
var (
	NotFoundHandler = func(c Context) error {
		return ErrNotFound
	}

	MethodNotAllowedHandler = func(c Context) error {
		return ErrMethodNotAllowed
	}
)

Error handlers

Functions

This section is empty.

Types

type Binder added in v1.2.0

type Binder interface {
	Bind(interface{}, Context) error
}

Binder is the interface that wraps the Bind method.

type Context

type Context interface {
	// Request returns `*http.Request`.
	Request() *http.Request

	// SetRequest sets `*http.Request`.
	SetRequest(*http.Request)

	// Request returns `*Response`.
	Response() *Response

	// IsTLS returns true if HTTP connection is TLS otherwise false.
	IsTLS() bool

	// Scheme returns the HTTP protocol scheme, `http` or `https`.
	Scheme() string

	// RealIP returns the client's network address based on `X-Forwarded-For`
	// or `X-Real-IP` request header.
	RealIP() string

	// Path returns the registered path for the handler.
	Path() string

	// SetPath sets the registered path for the handler.
	SetPath(string)

	// Param returns path parameter by name.
	Param(string) string

	// ParamNames returns path parameter names.
	ParamNames() []string

	// SetParamNames sets path parameter names.
	SetParamNames(...string)

	// ParamValues returns path parameter values.
	ParamValues() []string

	// SetParamValues sets path parameter values.
	SetParamValues(...string)

	// QueryParam returns the query param for the provided name.
	QueryParam(string) string

	// QueryParams returns the query parameters as `url.Values`.
	QueryParams() url.Values

	// QueryString returns the URL query string.
	QueryString() string

	// FormValue returns the form field value for the provided name.
	FormValue(string) string

	// FormParams returns the form parameters as `url.Values`.
	FormParams() (url.Values, error)

	// FormFile returns the multipart form file for the provided name.
	FormFile(string) (*multipart.FileHeader, error)

	// MultipartForm returns the multipart form.
	MultipartForm() (*multipart.Form, error)

	// Cookie returns the named cookie provided in the request.
	Cookie(string) (*http.Cookie, error)

	// SetCookie adds a `Set-Cookie` header in HTTP response.
	SetCookie(*http.Cookie)

	// Cookies returns the HTTP cookies sent with the request.
	Cookies() []*http.Cookie

	// Get retrieves data from the context.
	Get(string) interface{}

	// Set saves data in the context.
	Set(string, interface{})

	// Bind binds the request body into provided type `i`. The default binder
	// does it based on Content-Type header.
	Bind(interface{}) error

	// Render renders a template with data and sends a text/html response with status
	// code. Templates can be registered using `Echo.Renderer`.
	Render(int, string, interface{}) error

	// HTML sends an HTTP response with status code.
	HTML(int, string) error

	// String sends a string response with status code.
	String(int, string) error

	// JSON sends a JSON response with status code.
	JSON(int, interface{}) error

	// JSONBlob sends a JSON blob response with status code.
	JSONBlob(int, []byte) error

	// JSONP sends a JSONP response with status code. It uses `callback` to construct
	// the JSONP payload.
	JSONP(int, string, interface{}) error

	// JSONPBlob sends a JSONP blob response with status code. It uses `callback`
	// to construct the JSONP payload.
	JSONPBlob(int, string, []byte) error

	// XML sends an XML response with status code.
	XML(int, interface{}) error

	// XMLBlob sends a XML blob response with status code.
	XMLBlob(int, []byte) error

	// Blob sends a blob response with status code and content type.
	Blob(int, string, []byte) error

	// Stream sends a streaming response with status code and content type.
	Stream(int, string, io.Reader) error

	// File sends a response with the content of the file.
	File(string) error

	// Attachment sends a response as attachment, prompting client to save the
	// file.
	Attachment(string, string) error

	// Inline sends a response as inline, opening the file in the browser.
	Inline(string, string) error

	// NoContent sends a response with no body and a status code.
	NoContent(int) error

	// Redirect redirects the request with status code.
	Redirect(int, string) error

	// Error invokes the registered HTTP error handler. Generally used by middleware.
	Error(err error)

	// Handler returns the matched handler by router.
	Handler() HandlerFunc

	// SetHandler sets the matched handler by router.
	SetHandler(HandlerFunc)

	// Logger returns the `Logger` instance.
	Logger() Logger

	// Echo returns the `Echo` instance.
	Echo() *Echo

	// Reset resets the context after request completes. It must be called along
	// with `Echo#AcquireContext()` and `Echo#ReleaseContext()`.
	// See `Echo#ServeHTTP()`
	Reset(*http.Request, http.ResponseWriter)
}

Context represents the context of the current HTTP request. It holds request and response objects, path, path parameters, data and registered handler.

type Echo

type Echo struct {
	DisableHTTP2 bool
	Debug        bool
	HTTPErrorHandler
	Binder          Binder
	Renderer        Renderer
	AutoTLSManager  autocert.Manager
	ShutdownTimeout time.Duration
	Color           *color.Color
	Logger          Logger
	// contains filtered or unexported fields
}

Echo is the top-level framework instance.

func New

func New() (e *Echo)

New creates an instance of Echo.

func (*Echo) AcquireContext

func (e *Echo) AcquireContext() Context

AcquireContext returns an empty `Context` instance from the pool. You must return the context by calling `ReleaseContext()`.

func (*Echo) Any added in v1.2.0

func (e *Echo) Any(path string, handler HandlerFunc, middleware ...MiddlewareFunc)

Any registers a new route for all HTTP methods and path with matching handler in the router with optional route-level middleware.

func (*Echo) CONNECT

func (e *Echo) CONNECT(path string, h HandlerFunc, m ...MiddlewareFunc)

CONNECT registers a new CONNECT route for a path with matching handler in the router with optional route-level middleware.

func (*Echo) DELETE

func (e *Echo) DELETE(path string, h HandlerFunc, m ...MiddlewareFunc)

DELETE registers a new DELETE route for a path with matching handler in the router with optional route-level middleware.

func (*Echo) DefaultHTTPErrorHandler added in v1.0.0

func (e *Echo) DefaultHTTPErrorHandler(err error, c Context)

DefaultHTTPErrorHandler invokes the default HTTP error handler.

func (*Echo) File

func (e *Echo) File(path, file string)

File registers a new route with path to serve a static file.

func (*Echo) GET

func (e *Echo) GET(path string, h HandlerFunc, m ...MiddlewareFunc)

GET registers a new GET route for a path with matching handler in the router with optional route-level middleware.

func (*Echo) Group added in v0.0.4

func (e *Echo) Group(prefix string, m ...MiddlewareFunc) (g *Group)

Group creates a new router group with prefix and optional group-level middleware.

func (*Echo) HEAD

func (e *Echo) HEAD(path string, h HandlerFunc, m ...MiddlewareFunc)

HEAD registers a new HEAD route for a path with matching handler in the router with optional route-level middleware.

func (*Echo) Match added in v1.2.0

func (e *Echo) Match(methods []string, path string, handler HandlerFunc, middleware ...MiddlewareFunc)

Match registers a new route for multiple HTTP methods and path with matching handler in the router with optional route-level middleware.

func (*Echo) NewContext

func (e *Echo) NewContext(r *http.Request, w http.ResponseWriter) Context

NewContext returns a Context instance.

func (*Echo) OPTIONS

func (e *Echo) OPTIONS(path string, h HandlerFunc, m ...MiddlewareFunc)

OPTIONS registers a new OPTIONS route for a path with matching handler in the router with optional route-level middleware.

func (*Echo) PATCH

func (e *Echo) PATCH(path string, h HandlerFunc, m ...MiddlewareFunc)

PATCH registers a new PATCH route for a path with matching handler in the router with optional route-level middleware.

func (*Echo) POST

func (e *Echo) POST(path string, h HandlerFunc, m ...MiddlewareFunc)

POST registers a new POST route for a path with matching handler in the router with optional route-level middleware.

func (*Echo) PUT

func (e *Echo) PUT(path string, h HandlerFunc, m ...MiddlewareFunc)

PUT registers a new PUT route for a path with matching handler in the router with optional route-level middleware.

func (*Echo) Pre

func (e *Echo) Pre(middleware ...MiddlewareFunc)

Pre adds middleware to the chain which is run before router.

func (*Echo) ReleaseContext

func (e *Echo) ReleaseContext(c Context)

ReleaseContext returns the `Context` instance back to the pool. You must call it after `AcquireContext()`.

func (*Echo) Router

func (e *Echo) Router() *Router

Router returns router.

func (*Echo) Routes added in v1.0.0

func (e *Echo) Routes() []Route

Routes returns the registered routes.

func (*Echo) ServeHTTP

func (e *Echo) ServeHTTP(w http.ResponseWriter, r *http.Request)

ServeHTTP implements `http.Handler` interface, which serves HTTP requests.

func (*Echo) Shutdown

func (e *Echo) Shutdown(timeout time.Duration)

Shutdown gracefully shutdown the HTTP server with timeout.

func (*Echo) ShutdownTLS

func (e *Echo) ShutdownTLS(timeout time.Duration)

ShutdownTLS gracefully shutdown the TLS server with timeout.

func (*Echo) Start

func (e *Echo) Start(address string) error

Start starts the HTTP server.

func (*Echo) StartAutoTLS

func (e *Echo) StartAutoTLS(address string) error

StartAutoTLS starts the HTTPS server using certificates automatically from https://letsencrypt.org.

func (*Echo) StartServer

func (e *Echo) StartServer(s *http.Server) error

StartServer runs a custom HTTP server.

func (*Echo) StartTLS

func (e *Echo) StartTLS(address string, certFile, keyFile string) (err error)

StartTLS starts the HTTPS server.

func (*Echo) Static

func (e *Echo) Static(prefix, root string)

Static registers a new route with path prefix to serve static files from the provided root directory.

func (*Echo) TRACE

func (e *Echo) TRACE(path string, h HandlerFunc, m ...MiddlewareFunc)

TRACE registers a new TRACE route for a path with matching handler in the router with optional route-level middleware.

func (*Echo) URI added in v0.0.11

func (e *Echo) URI(handler HandlerFunc, params ...interface{}) string

URI generates a URI from handler.

func (*Echo) URL added in v0.0.11

func (e *Echo) URL(h HandlerFunc, params ...interface{}) string

URL is an alias for `URI` function.

func (*Echo) Use

func (e *Echo) Use(middleware ...MiddlewareFunc)

Use adds middleware to the chain which is run after router.

type Group added in v0.0.16

type Group struct {
	// contains filtered or unexported fields
}

Group is a set of sub-routes for a specified route. It can be used for inner routes that share a common middlware or functionality that should be separate from the parent echo instance while still inheriting from it.

func (*Group) Any added in v1.4.1

func (g *Group) Any(path string, handler HandlerFunc, middleware ...MiddlewareFunc)

Any implements `Echo#Any()` for sub-routes within the Group.

func (*Group) CONNECT

func (g *Group) CONNECT(path string, h HandlerFunc, m ...MiddlewareFunc)

CONNECT implements `Echo#CONNECT()` for sub-routes within the Group.

func (*Group) DELETE

func (g *Group) DELETE(path string, h HandlerFunc, m ...MiddlewareFunc)

DELETE implements `Echo#DELETE()` for sub-routes within the Group.

func (*Group) File

func (g *Group) File(path, file string)

File implements `Echo#File()` for sub-routes within the Group.

func (*Group) GET

func (g *Group) GET(path string, h HandlerFunc, m ...MiddlewareFunc)

GET implements `Echo#GET()` for sub-routes within the Group.

func (*Group) Group added in v0.0.16

func (g *Group) Group(prefix string, middleware ...MiddlewareFunc) *Group

Group creates a new sub-group with prefix and optional sub-group-level middleware.

func (*Group) HEAD

func (g *Group) HEAD(path string, h HandlerFunc, m ...MiddlewareFunc)

HEAD implements `Echo#HEAD()` for sub-routes within the Group.

func (*Group) Match added in v1.4.1

func (g *Group) Match(methods []string, path string, handler HandlerFunc, middleware ...MiddlewareFunc)

Match implements `Echo#Match()` for sub-routes within the Group.

func (*Group) OPTIONS

func (g *Group) OPTIONS(path string, h HandlerFunc, m ...MiddlewareFunc)

OPTIONS implements `Echo#OPTIONS()` for sub-routes within the Group.

func (*Group) PATCH

func (g *Group) PATCH(path string, h HandlerFunc, m ...MiddlewareFunc)

PATCH implements `Echo#PATCH()` for sub-routes within the Group.

func (*Group) POST

func (g *Group) POST(path string, h HandlerFunc, m ...MiddlewareFunc)

POST implements `Echo#POST()` for sub-routes within the Group.

func (*Group) PUT

func (g *Group) PUT(path string, h HandlerFunc, m ...MiddlewareFunc)

PUT implements `Echo#PUT()` for sub-routes within the Group.

func (*Group) Static added in v1.0.0

func (g *Group) Static(prefix, root string)

Static implements `Echo#Static()` for sub-routes within the Group.

func (*Group) TRACE

func (g *Group) TRACE(path string, h HandlerFunc, m ...MiddlewareFunc)

TRACE implements `Echo#TRACE()` for sub-routes within the Group.

func (*Group) Use added in v0.0.16

func (g *Group) Use(middleware ...MiddlewareFunc)

Use implements `Echo#Use()` for sub-routes within the Group.

type HTTPError added in v0.0.12

type HTTPError struct {
	Code    int
	Message string
}

HTTPError represents an error that occurred while handling a request.

func NewHTTPError added in v0.0.14

func NewHTTPError(code int, msg ...interface{}) *HTTPError

NewHTTPError creates a new HTTPError instance.

func (*HTTPError) Error added in v0.0.12

func (e *HTTPError) Error() string

Error makes it compatible with `error` interface.

type HTTPErrorHandler added in v0.0.10

type HTTPErrorHandler func(error, Context)

HTTPErrorHandler is a centralized HTTP error handler.

type HandlerFunc

type HandlerFunc func(Context) error

HandlerFunc defines a function to server HTTP requests.

func WrapHandler

func WrapHandler(h http.Handler) HandlerFunc

WrapHandler wraps `http.Handler` into `echo.HandlerFunc`.

type Logger added in v0.0.10

type Logger interface {
	Output() io.Writer
	SetOutput(io.Writer)
	Level() log.Lvl
	SetLevel(log.Lvl)
	Prefix() string
	SetPrefix(string)
	Print(...interface{})
	Printf(string, ...interface{})
	Printj(log.JSON)
	Debug(...interface{})
	Debugf(string, ...interface{})
	Debugj(log.JSON)
	Info(...interface{})
	Infof(string, ...interface{})
	Infoj(log.JSON)
	Warn(...interface{})
	Warnf(string, ...interface{})
	Warnj(log.JSON)
	Error(...interface{})
	Errorf(string, ...interface{})
	Errorj(log.JSON)
	Fatal(...interface{})
	Fatalj(log.JSON)
	Fatalf(string, ...interface{})
	Panic(...interface{})
	Panicj(log.JSON)
	Panicf(string, ...interface{})
}

Logger defines the logging interface.

type Map

type Map map[string]interface{}

Map defines a generic map of type `map[string]interface{}`.

type MiddlewareFunc

type MiddlewareFunc func(HandlerFunc) HandlerFunc

MiddlewareFunc defines a function to process middleware.

func WrapMiddleware

func WrapMiddleware(m func(http.Handler) http.Handler) MiddlewareFunc

WrapMiddleware wraps `func(http.Handler) http.Handler` into `echo.MiddlewareFunc`

type Renderer added in v0.0.7

type Renderer interface {
	Render(io.Writer, string, interface{}, Context) error
}

Renderer is the interface that wraps the Render function.

type Response added in v0.0.13

type Response struct {
	Status    int
	Size      int64
	Committed bool
	// contains filtered or unexported fields
}

Response wraps an http.ResponseWriter and implements its interface to be used by an HTTP handler to construct an HTTP response. See: https://golang.org/pkg/net/http/#ResponseWriter

func NewResponse added in v0.0.14

func NewResponse(w http.ResponseWriter, e *Echo) (r *Response)

NewResponse creates a new instance of Response.

func (*Response) CloseNotify added in v0.0.13

func (r *Response) CloseNotify() <-chan bool

CloseNotify implements the http.CloseNotifier interface to allow detecting when the underlying connection has gone away. This mechanism can be used to cancel long operations on the server if the client has disconnected before the response is ready. See [http.CloseNotifier](https://golang.org/pkg/net/http/#CloseNotifier)

func (*Response) Flush added in v0.0.13

func (r *Response) Flush()

Flush implements the http.Flusher interface to allow an HTTP handler to flush buffered data to the client. See [http.Flusher](https://golang.org/pkg/net/http/#Flusher)

func (*Response) Header added in v0.0.13

func (r *Response) Header() http.Header

Header returns the header map for the writer that will be sent by WriteHeader. Changing the header after a call to WriteHeader (or Write) has no effect unless the modified headers were declared as trailers by setting the "Trailer" header before the call to WriteHeader (see example) To suppress implicit response headers, set their value to nil. Example: https://golang.org/pkg/net/http/#example_ResponseWriter_trailers

func (*Response) Hijack added in v0.0.13

func (r *Response) Hijack() (net.Conn, *bufio.ReadWriter, error)

Hijack implements the http.Hijacker interface to allow an HTTP handler to take over the connection. See [http.Hijacker](https://golang.org/pkg/net/http/#Hijacker)

func (*Response) SetWriter added in v0.0.15

func (r *Response) SetWriter(w http.ResponseWriter)

SetWriter sets the http.ResponseWriter instance for this Response.

func (*Response) Write added in v0.0.13

func (r *Response) Write(b []byte) (n int, err error)

Write writes the data to the connection as part of an HTTP reply.

func (*Response) WriteHeader added in v0.0.13

func (r *Response) WriteHeader(code int)

WriteHeader sends an HTTP response header with status code. If WriteHeader is not called explicitly, the first call to Write will trigger an implicit WriteHeader(http.StatusOK). Thus explicit calls to WriteHeader are mainly used to send error codes.

func (*Response) Writer added in v0.0.13

func (r *Response) Writer() http.ResponseWriter

Writer returns the http.ResponseWriter instance for this Response.

type Route added in v1.0.0

type Route struct {
	Method  string
	Path    string
	Handler string
}

Route contains a handler and information for matching against requests.

type Router added in v0.0.16

type Router struct {
	// contains filtered or unexported fields
}

Router is the registry of all registered routes for an `Echo` instance for request matching and URL path parameter parsing.

func NewRouter

func NewRouter(e *Echo) *Router

NewRouter returns a new Router instance.

func (*Router) Add added in v0.0.16

func (r *Router) Add(method, path string, h HandlerFunc)

Add registers a new route for method and path with matching handler.

func (*Router) Find added in v0.0.16

func (r *Router) Find(method, path string, context Context)

Find lookup a handler registed for method and path. It also parses URL for path parameters and load them into context.

For performance:

- Get context from `Echo#AcquireContext()` - Reset it `Context#Reset()` - Return it `Echo#ReleaseContext()`.

type Validator added in v1.2.0

type Validator interface {
	Validate() error
}

Validator is the interface that wraps the Validate function.

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