restful

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README

go-restful

package for building REST-style Web Services using Google Go

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REST asks developers to use HTTP methods explicitly and in a way that's consistent with the protocol definition. This basic REST design principle establishes a one-to-one mapping between create, read, update, and delete (CRUD) operations and HTTP methods. According to this mapping:

  • GET = Retrieve a representation of a resource
  • POST = Create if you are sending content to the server to create a subordinate of the specified resource collection, using some server-side algorithm.
  • PUT = Create if you are sending the full content of the specified resource (URI).
  • PUT = Update if you are updating the full content of the specified resource.
  • DELETE = Delete if you are requesting the server to delete the resource
  • PATCH = Update partial content of a resource
  • OPTIONS = Get information about the communication options for the request URI
Example
ws := new(restful.WebService)
ws.
	Path("/users").
	Consumes(restful.MIME_XML, restful.MIME_JSON).
	Produces(restful.MIME_JSON, restful.MIME_XML)

ws.Route(ws.GET("/{user-id}").To(u.findUser).
	Doc("get a user").
	Param(ws.PathParameter("user-id", "identifier of the user").DataType("string")).
	Writes(User{}))		
...
	
func (u UserResource) findUser(request *restful.Request, response *restful.Response) {
	id := request.PathParameter("user-id")
	...
}

Full API of a UserResource

Features
  • Routes for request → function mapping with path parameter (e.g. {id}) support
  • Configurable router:
    • (default) Fast routing algorithm that allows static elements, regular expressions and dynamic parameters in the URL path (e.g. /meetings/{id} or /static/{subpath:*}
    • Routing algorithm after JSR311 that is implemented using (but does not accept) regular expressions
  • Request API for reading structs from JSON/XML and accesing parameters (path,query,header)
  • Response API for writing structs to JSON/XML and setting headers
  • Customizable encoding using EntityReaderWriter registration
  • Filters for intercepting the request → response flow on Service or Route level
  • Request-scoped variables using attributes
  • Containers for WebServices on different HTTP endpoints
  • Content encoding (gzip,deflate) of request and response payloads
  • Automatic responses on OPTIONS (using a filter)
  • Automatic CORS request handling (using a filter)
  • API declaration for Swagger UI (go-restful-openapi, see go-restful-swagger12)
  • Panic recovery to produce HTTP 500, customizable using RecoverHandler(...)
  • Route errors produce HTTP 404/405/406/415 errors, customizable using ServiceErrorHandler(...)
  • Configurable (trace) logging
  • Customizable gzip/deflate readers and writers using CompressorProvider registration
Resources

Type git shortlog -s for a full list of contributors.

© 2012 - 2017, http://ernestmicklei.com. MIT License. Contributions are welcome.

Documentation

Overview

Package restful , a lean package for creating REST-style WebServices without magic.

WebServices and Routes

A WebService has a collection of Route objects that dispatch incoming Http Requests to a function calls. Typically, a WebService has a root path (e.g. /users) and defines common MIME types for its routes. WebServices must be added to a container (see below) in order to handler Http requests from a server.

A Route is defined by a HTTP method, an URL path and (optionally) the MIME types it consumes (Content-Type) and produces (Accept). This package has the logic to find the best matching Route and if found, call its Function. 

ws := new(restful.WebService)
ws.
	Path("/users").
	Consumes(restful.MIME_JSON, restful.MIME_XML).
	Produces(restful.MIME_JSON, restful.MIME_XML)

ws.Route(ws.GET("/{user-id}").To(u.findUser))  // u is a UserResource

...

// GET http://localhost:8080/users/1
func (u UserResource) findUser(request *restful.Request, response *restful.Response) {
	id := request.PathParameter("user-id")
	...
}

The (*Request, *Response) arguments provide functions for reading information from the request and writing information back to the response.

See the example https://github.com/emicklei/go-restful/blob/master/examples/restful-user-resource.go with a full implementation.

Regular expression matching Routes

A Route parameter can be specified using the format "uri/{var[:regexp]}" or the special version "uri/{var:*}" for matching the tail of the path. For example, /persons/{name:[A-Z][A-Z]} can be used to restrict values for the parameter "name" to only contain capital alphabetic characters. Regular expressions must use the standard Go syntax as described in the regexp package. (https://code.google.com/p/re2/wiki/Syntax) This feature requires the use of a CurlyRouter.

Containers

A Container holds a collection of WebServices, Filters and a http.ServeMux for multiplexing http requests. Using the statements "restful.Add(...) and restful.Filter(...)" will register WebServices and Filters to the Default Container. The Default container of go-restful uses the http.DefaultServeMux. You can create your own Container and create a new http.Server for that particular container. 

container := restful.NewContainer()
server := &http.Server{Addr: ":8081", Handler: container}

Filters

A filter dynamically intercepts requests and responses to transform or use the information contained in the requests or responses. You can use filters to perform generic logging, measurement, authentication, redirect, set response headers etc. In the restful package there are three hooks into the request,response flow where filters can be added. Each filter must define a FilterFunction: 

func (req *restful.Request, resp *restful.Response, chain *restful.FilterChain)

Use the following statement to pass the request,response pair to the next filter or RouteFunction 

chain.ProcessFilter(req, resp)

Container Filters

These are processed before any registered WebService. 

// install a (global) filter for the default container (processed before any webservice)
restful.Filter(globalLogging)

WebService Filters

These are processed before any Route of a WebService. 

// install a webservice filter (processed before any route)
ws.Filter(webserviceLogging).Filter(measureTime)

Route Filters

These are processed before calling the function associated with the Route. 

// install 2 chained route filters (processed before calling findUser)
ws.Route(ws.GET("/{user-id}").Filter(routeLogging).Filter(NewCountFilter().routeCounter).To(findUser))

See the example https://github.com/emicklei/go-restful/blob/master/examples/restful-filters.go with full implementations.

Response Encoding

Two encodings are supported: gzip and deflate. To enable this for all responses: 

restful.DefaultContainer.EnableContentEncoding(true)

If a Http request includes the Accept-Encoding header then the response content will be compressed using the specified encoding. Alternatively, you can create a Filter that performs the encoding and install it per WebService or Route.

See the example https://github.com/emicklei/go-restful/blob/master/examples/restful-encoding-filter.go

OPTIONS support

By installing a pre-defined container filter, your Webservice(s) can respond to the OPTIONS Http request. 

Filter(OPTIONSFilter())

CORS

By installing the filter of a CrossOriginResourceSharing (CORS), your WebService(s) can handle CORS requests. 

cors := CrossOriginResourceSharing{ExposeHeaders: []string{"X-My-Header"}, CookiesAllowed: false, Container: DefaultContainer}
Filter(cors.Filter)

Error Handling

Unexpected things happen. If a request cannot be processed because of a failure, your service needs to tell via the response what happened and why. For this reason HTTP status codes exist and it is important to use the correct code in every exceptional situation. 

400: Bad Request

If path or query parameters are not valid (content or type) then use http.StatusBadRequest. 

404: Not Found

Despite a valid URI, the resource requested may not be available 

500: Internal Server Error

If the application logic could not process the request (or write the response) then use http.StatusInternalServerError. 

405: Method Not Allowed

The request has a valid URL but the method (GET,PUT,POST,...) is not allowed. 

406: Not Acceptable

The request does not have or has an unknown Accept Header set for this operation. 

415: Unsupported Media Type

The request does not have or has an unknown Content-Type Header set for this operation.

ServiceError

In addition to setting the correct (error) Http status code, you can choose to write a ServiceError message on the response.

Performance options

This package has several options that affect the performance of your service. It is important to understand them and how you can change it. 

restful.DefaultContainer.DoNotRecover(false)

DoNotRecover controls whether panics will be caught to return HTTP 500. If set to false, the container will recover from panics. Default value is true 

restful.SetCompressorProvider(NewBoundedCachedCompressors(20, 20))

If content encoding is enabled then the default strategy for getting new gzip/zlib writers and readers is to use a sync.Pool. Because writers are expensive structures, performance is even more improved when using a preloaded cache. You can also inject your own implementation.

Trouble shooting

This package has the means to produce detail logging of the complete Http request matching process and filter invocation. Enabling this feature requires you to set an implementation of restful.StdLogger (e.g. log.Logger) instance such as: 

restful.TraceLogger(log.New(os.Stdout, "[restful] ", log.LstdFlags|log.Lshortfile))

Logging

The restful.SetLogger() method allows you to override the logger used by the package. By default restful uses the standard library `log` package and logs to stdout. Different logging packages are supported as long as they conform to `StdLogger` interface defined in the `log` sub-package, writing an adapter for your preferred package is simple.

Resources

(c) 2012-2015, http://ernestmicklei.com. MIT License

Index

Examples

Constants

View Source 
const (
	MIME_XML   = "application/xml"          // Accept or Content-Type used in Consumes() and/or Produces()
	MIME_JSON  = "application/json"         // Accept or Content-Type used in Consumes() and/or Produces()
	MIME_OCTET = "application/octet-stream" // If Content-Type is not present in request, use the default

	HEADER_Allow                         = "Allow"
	HEADER_Accept                        = "Accept"
	HEADER_Origin                        = "Origin"
	HEADER_ContentType                   = "Content-Type"
	HEADER_LastModified                  = "Last-Modified"
	HEADER_AcceptEncoding                = "Accept-Encoding"
	HEADER_ContentEncoding               = "Content-Encoding"
	HEADER_AccessControlExposeHeaders    = "Access-Control-Expose-Headers"
	HEADER_AccessControlRequestMethod    = "Access-Control-Request-Method"
	HEADER_AccessControlRequestHeaders   = "Access-Control-Request-Headers"
	HEADER_AccessControlAllowMethods     = "Access-Control-Allow-Methods"
	HEADER_AccessControlAllowOrigin      = "Access-Control-Allow-Origin"
	HEADER_AccessControlAllowCredentials = "Access-Control-Allow-Credentials"
	HEADER_AccessControlAllowHeaders     = "Access-Control-Allow-Headers"
	HEADER_AccessControlMaxAge           = "Access-Control-Max-Age"

	ENCODING_GZIP    = "gzip"
	ENCODING_DEFLATE = "deflate"
)
View Source 
const (
	// PathParameterKind = indicator of Request parameter type "path"
	PathParameterKind = iota

	// QueryParameterKind = indicator of Request parameter type "query"
	QueryParameterKind

	// BodyParameterKind = indicator of Request parameter type "body"
	BodyParameterKind

	// HeaderParameterKind = indicator of Request parameter type "header"
	HeaderParameterKind

	// FormParameterKind = indicator of Request parameter type "form"
	FormParameterKind
)

Variables

View Source 
var DefaultResponseMimeType string

DefaultResponseMimeType is DEPRECATED, use DefaultResponseContentType(mime)

View Source 
var DoNotRecover = false

If set the true then panics will not be caught to return HTTP 500. In that case, Route functions are responsible for handling any error situation. Default value is false = recover from panics. This has performance implications. OBSOLETE ; use restful.DefaultContainer.DoNotRecover(true)

View Source 
var EnableContentEncoding = false

OBSOLETE : use restful.DefaultContainer.EnableContentEncoding(true) to change this setting.

View Source 
var PrettyPrintResponses = true

PrettyPrintResponses controls the indentation feature of XML and JSON serialization

Functions

func Add 

func Add(service *WebService)

Add registers a new WebService add it to the DefaultContainer.

func DefaultRequestContentType added in v1.1.2 

func DefaultRequestContentType(mime string)

If ContentType is missing or */* is given then fall back to this type, otherwise a "Unable to unmarshal content of type:" response is returned. Valid values are restful.MIME_JSON and restful.MIME_XML Example: 

restful.DefaultRequestContentType(restful.MIME_JSON)

func DefaultResponseContentType added in v1.1.2 

func DefaultResponseContentType(mime string)

DefaultResponseContentType set a default. If Accept header matching fails, fall back to this type. Valid values are restful.MIME_JSON and restful.MIME_XML Example: 

restful.DefaultResponseContentType(restful.MIME_JSON)

func EnableTracing 

func EnableTracing(enabled bool)

EnableTracing can be used to Trace logging on and off.

func Filter 

func Filter(filter FilterFunction)

Filter appends a container FilterFunction from the DefaultContainer. These are called before dispatching a http.Request to a WebService.

func NoBrowserCacheFilter 

func NoBrowserCacheFilter(req *Request, resp *Response, chain *FilterChain)

NoBrowserCacheFilter is a filter function to set HTTP headers that disable browser caching See examples/restful-no-cache-filter.go for usage

func RegisterEntityAccessor 

func RegisterEntityAccessor(mime string, erw EntityReaderWriter)

RegisterEntityAccessor add/overrides the ReaderWriter for encoding content with this MIME type.

func SetCompressorProvider 

func SetCompressorProvider(p CompressorProvider)

SetCompressorProvider sets the actual provider of compressors (zlib or gzip).

func SetLogger 

func SetLogger(customLogger log.StdLogger)

SetLogger exposes the setter for the global logger on the top-level package

func TraceLogger added in v1.1.3 

func TraceLogger(logger log.StdLogger)

TraceLogger enables detailed logging of Http request matching and filter invocation. Default no logger is set. You may call EnableTracing() directly to enable trace logging to the package-wide logger.

Types

type BoundedCachedCompressors 

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

BoundedCachedCompressors is a CompressorProvider that uses a cache with a fixed amount of writers and readers (resources). If a new resource is acquired and all are in use, it will return a new unmanaged resource.

Example 
// Register a compressor provider (gzip/deflate read/write) that uses
// a bounded cache with a maximum of 20 writers and 20 readers.
SetCompressorProvider(NewBoundedCachedCompressors(20, 20))

Output:

func NewBoundedCachedCompressors 

func NewBoundedCachedCompressors(writersCapacity, readersCapacity int) *BoundedCachedCompressors

NewBoundedCachedCompressors returns a new, with filled cache, BoundedCachedCompressors.

func (*BoundedCachedCompressors) AcquireGzipReader 

func (b *BoundedCachedCompressors) AcquireGzipReader() *gzip.Reader

AcquireGzipReader returns a *gzip.Reader. Needs to be released.

func (*BoundedCachedCompressors) AcquireGzipWriter 

func (b *BoundedCachedCompressors) AcquireGzipWriter() *gzip.Writer

AcquireGzipWriter returns an resettable *gzip.Writer. Needs to be released.

func (*BoundedCachedCompressors) AcquireZlibWriter 

func (b *BoundedCachedCompressors) AcquireZlibWriter() *zlib.Writer

AcquireZlibWriter returns an resettable *zlib.Writer. Needs to be released.

func (*BoundedCachedCompressors) ReleaseGzipReader 

func (b *BoundedCachedCompressors) ReleaseGzipReader(r *gzip.Reader)

ReleaseGzipReader accepts a reader (does not have to be one that was cached) only when the cache has room for it. It will ignore it otherwise.

func (*BoundedCachedCompressors) ReleaseGzipWriter 

func (b *BoundedCachedCompressors) ReleaseGzipWriter(w *gzip.Writer)

ReleaseGzipWriter accepts a writer (does not have to be one that was cached) only when the cache has room for it. It will ignore it otherwise.

func (*BoundedCachedCompressors) ReleaseZlibWriter 

func (b *BoundedCachedCompressors) ReleaseZlibWriter(w *zlib.Writer)

ReleaseZlibWriter accepts a writer (does not have to be one that was cached) only when the cache has room for it. It will ignore it otherwise.

type CompressingResponseWriter 

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

CompressingResponseWriter is a http.ResponseWriter that can perform content encoding (gzip and zlib)

func NewCompressingResponseWriter 

func NewCompressingResponseWriter(httpWriter http.ResponseWriter, encoding string) (*CompressingResponseWriter, error)

NewCompressingResponseWriter create a CompressingResponseWriter for a known encoding = {gzip,deflate}

func (*CompressingResponseWriter) Close 

func (c *CompressingResponseWriter) Close() error

Close the underlying compressor

func (*CompressingResponseWriter) CloseNotify 

func (c *CompressingResponseWriter) CloseNotify() <-chan bool

CloseNotify is part of http.CloseNotifier interface

func (*CompressingResponseWriter) Header 

func (c *CompressingResponseWriter) Header() http.Header

Header is part of http.ResponseWriter interface

func (*CompressingResponseWriter) Hijack 

func (c *CompressingResponseWriter) Hijack() (net.Conn, *bufio.ReadWriter, error)

Hijack implements the Hijacker interface This is especially useful when combining Container.EnabledContentEncoding in combination with websockets (for instance gorilla/websocket)

func (*CompressingResponseWriter) Write 

func (c *CompressingResponseWriter) Write(bytes []byte) (int, error)

Write is part of http.ResponseWriter interface It is passed through the compressor

func (*CompressingResponseWriter) WriteHeader 

func (c *CompressingResponseWriter) WriteHeader(status int)

WriteHeader is part of http.ResponseWriter interface

type CompressorProvider 

type CompressorProvider interface {
	// Returns a *gzip.Writer which needs to be released later.
	// Before using it, call Reset().
	AcquireGzipWriter() *gzip.Writer

	// Releases an acquired *gzip.Writer.
	ReleaseGzipWriter(w *gzip.Writer)

	// Returns a *gzip.Reader which needs to be released later.
	AcquireGzipReader() *gzip.Reader

	// Releases an acquired *gzip.Reader.
	ReleaseGzipReader(w *gzip.Reader)

	// Returns a *zlib.Writer which needs to be released later.
	// Before using it, call Reset().
	AcquireZlibWriter() *zlib.Writer

	// Releases an acquired *zlib.Writer.
	ReleaseZlibWriter(w *zlib.Writer)
}

CompressorProvider describes a component that can provider compressors for the std methods.

func CurrentCompressorProvider 

func CurrentCompressorProvider() CompressorProvider

CurrentCompressorProvider returns the current CompressorProvider. It is initialized using a SyncPoolCompessors.

type Container 

type Container struct {
	ServeMux *http.ServeMux
	// contains filtered or unexported fields
}

Container holds a collection of WebServices and a http.ServeMux to dispatch http requests. The requests are further dispatched to routes of WebServices using a RouteSelector

Example 
// The Default container of go-restful uses the http.DefaultServeMux.
// You can create your own Container using restful.NewContainer() and create a new http.Server for that particular container

ws := new(WebService)
wsContainer := NewContainer()
wsContainer.Add(ws)
server := &http.Server{Addr: ":8080", Handler: wsContainer}
server.ListenAndServe()

Output:


var DefaultContainer *Container

DefaultContainer is a restful.Container that uses http.DefaultServeMux

func NewContainer 

func NewContainer() *Container

NewContainer creates a new Container using a new ServeMux and default router (CurlyRouter)

func (*Container) Add 

func (c *Container) Add(service *WebService) *Container

Add a WebService to the Container. It will detect duplicate root paths and exit in that case.

func (*Container) Dispatch 

func (c *Container) Dispatch(httpWriter http.ResponseWriter, httpRequest *http.Request)

Dispatch the incoming Http Request to a matching WebService.

func (*Container) DoNotRecover 

func (c *Container) DoNotRecover(doNot bool)

DoNotRecover controls whether panics will be caught to return HTTP 500. If set to true, Route functions are responsible for handling any error situation. Default value is true.

func (*Container) EnableContentEncoding 

func (c *Container) EnableContentEncoding(enabled bool)

EnableContentEncoding (default=false) allows for GZIP or DEFLATE encoding of responses.

func (*Container) Filter 

func (c *Container) Filter(filter FilterFunction)

Filter appends a container FilterFunction. These are called before dispatching a http.Request to a WebService from the container

func (*Container) Handle 

func (c *Container) Handle(pattern string, handler http.Handler)

Handle registers the handler for the given pattern. If a handler already exists for pattern, Handle panics.

func (*Container) HandleWithFilter added in v1.1.3 

func (c *Container) HandleWithFilter(pattern string, handler http.Handler)

HandleWithFilter registers the handler for the given pattern. Container's filter chain is applied for handler. If a handler already exists for pattern, HandleWithFilter panics.

func (*Container) OPTIONSFilter 

func (c *Container) OPTIONSFilter(req *Request, resp *Response, chain *FilterChain)

OPTIONSFilter is a filter function that inspects the Http Request for the OPTIONS method and provides the response with a set of allowed methods for the request URL Path. As for any filter, you can also install it for a particular WebService within a Container. Note: this filter is not needed when using CrossOriginResourceSharing (for CORS).

Example 
// Install the OPTIONS filter on a Container
myContainer := new(Container)
myContainer.Filter(myContainer.OPTIONSFilter)

Output:

func (*Container) RecoverHandler 

func (c *Container) RecoverHandler(handler RecoverHandleFunction)

RecoverHandler changes the default function (logStackOnRecover) to be called when a panic is detected. DoNotRecover must be have its default value (=false).

func (*Container) RegisteredWebServices 

func (c *Container) RegisteredWebServices() []*WebService

RegisteredWebServices returns the collections of added WebServices

func (*Container) Remove 

func (c *Container) Remove(ws *WebService) error

func (*Container) Router 

func (c *Container) Router(aRouter RouteSelector)

Router changes the default Router (currently CurlyRouter)

func (*Container) ServeHTTP 

func (c *Container) ServeHTTP(httpwriter http.ResponseWriter, httpRequest *http.Request)

ServeHTTP implements net/http.Handler therefore a Container can be a Handler in a http.Server

func (*Container) ServiceErrorHandler 

func (c *Container) ServiceErrorHandler(handler ServiceErrorHandleFunction)

ServiceErrorHandler changes the default function (writeServiceError) to be called when a ServiceError is detected.

type CrossOriginResourceSharing 

type CrossOriginResourceSharing struct {
	ExposeHeaders  []string // list of Header names
	AllowedHeaders []string // list of Header names
	AllowedDomains []string // list of allowed values for Http Origin. An allowed value can be a regular expression to support subdomain matching. If empty all are allowed.
	AllowedMethods []string
	MaxAge         int // number of seconds before requiring new Options request
	CookiesAllowed bool
	Container      *Container
	// contains filtered or unexported fields
}

CrossOriginResourceSharing is used to create a Container Filter that implements CORS. Cross-origin resource sharing (CORS) is a mechanism that allows JavaScript on a web page to make XMLHttpRequests to another domain, not the domain the JavaScript originated from.

http://en.wikipedia.org/wiki/Cross-origin_resource_sharing http://enable-cors.org/server.html http://www.html5rocks.com/en/tutorials/cors/#toc-handling-a-not-so-simple-request

Example 
// To install this filter on the Default Container use:
cors := CrossOriginResourceSharing{ExposeHeaders: []string{"X-My-Header"}, CookiesAllowed: false, Container: DefaultContainer}
Filter(cors.Filter)

Output:

func (CrossOriginResourceSharing) Filter 

func (c CrossOriginResourceSharing) Filter(req *Request, resp *Response, chain *FilterChain)

Filter is a filter function that implements the CORS flow as documented on http://enable-cors.org/server.html and http://www.html5rocks.com/static/images/cors_server_flowchart.png

type CurlyRouter 

type CurlyRouter struct{}

CurlyRouter expects Routes with paths that contain zero or more parameters in curly brackets.

func (CurlyRouter) SelectRoute 

func (c CurlyRouter) SelectRoute(
	webServices []*WebService,
	httpRequest *http.Request) (selectedService *WebService, selected *Route, err error)

SelectRoute is part of the Router interface and returns the best match for the WebService and its Route for the given Request.

type EntityReaderWriter 

type EntityReaderWriter interface {
	// Read a serialized version of the value from the request.
	// The Request may have a decompressing reader. Depends on Content-Encoding.
	Read(req *Request, v interface{}) error

	// Write a serialized version of the value on the response.
	// The Response may have a compressing writer. Depends on Accept-Encoding.
	// status should be a valid Http Status code
	Write(resp *Response, status int, v interface{}) error
}

EntityReaderWriter can read and write values using an encoding such as JSON,XML.

func NewEntityAccessorJSON 

func NewEntityAccessorJSON(contentType string) EntityReaderWriter

NewEntityAccessorJSON returns a new EntityReaderWriter for accessing JSON content. This package is already initialized with such an accessor using the MIME_JSON contentType.

func NewEntityAccessorXML 

func NewEntityAccessorXML(contentType string) EntityReaderWriter

NewEntityAccessorXML returns a new EntityReaderWriter for accessing XML content. This package is already initialized with such an accessor using the MIME_XML contentType.

type FilterChain 

type FilterChain struct {
	Filters []FilterFunction // ordered list of FilterFunction
	Index   int              // index into filters that is currently in progress
	Target  RouteFunction    // function to call after passing all filters
}

FilterChain is a request scoped object to process one or more filters before calling the target RouteFunction.

func (*FilterChain) ProcessFilter 

func (f *FilterChain) ProcessFilter(request *Request, response *Response)

ProcessFilter passes the request,response pair through the next of Filters. Each filter can decide to proceed to the next Filter or handle the Response itself.

type FilterFunction 

type FilterFunction func(*Request, *Response, *FilterChain)

FilterFunction definitions must call ProcessFilter on the FilterChain to pass on the control and eventually call the RouteFunction

func OPTIONSFilter 

func OPTIONSFilter() FilterFunction

OPTIONSFilter is a filter function that inspects the Http Request for the OPTIONS method and provides the response with a set of allowed methods for the request URL Path. Note: this filter is not needed when using CrossOriginResourceSharing (for CORS).

Example 
// Install the OPTIONS filter on the default Container
Filter(OPTIONSFilter())

Output:

type Parameter 

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

Parameter is for documententing the parameter used in a Http Request ParameterData kinds are Path,Query and Body

func BodyParameter 

func BodyParameter(name, description string) *Parameter

BodyParameter creates a new Parameter of kind Body for documentation purposes. It is initialized as required without a DataType.

func FormParameter 

func FormParameter(name, description string) *Parameter

FormParameter creates a new Parameter of kind Form (using application/x-www-form-urlencoded) for documentation purposes. It is initialized as required with string as its DataType.

func HeaderParameter 

func HeaderParameter(name, description string) *Parameter

HeaderParameter creates a new Parameter of kind (Http) Header for documentation purposes. It is initialized as not required with string as its DataType.

func PathParameter 

func PathParameter(name, description string) *Parameter

PathParameter creates a new Parameter of kind Path for documentation purposes. It is initialized as required with string as its DataType.

func QueryParameter 

func QueryParameter(name, description string) *Parameter

QueryParameter creates a new Parameter of kind Query for documentation purposes. It is initialized as not required with string as its DataType.

func (*Parameter) AllowMultiple 

func (p *Parameter) AllowMultiple(multiple bool) *Parameter

AllowMultiple sets the allowMultiple field and returns the receiver

func (*Parameter) AllowableValues 

func (p *Parameter) AllowableValues(values map[string]string) *Parameter

AllowableValues sets the allowableValues field and returns the receiver

func (*Parameter) Data 

func (p *Parameter) Data() ParameterData

Data returns the state of the Parameter

func (*Parameter) DataFormat 

func (p *Parameter) DataFormat(formatName string) *Parameter

DataFormat sets the dataFormat field for Swagger UI

func (*Parameter) DataType 

func (p *Parameter) DataType(typeName string) *Parameter

DataType sets the dataType field and returns the receiver

func (*Parameter) DefaultValue 

func (p *Parameter) DefaultValue(stringRepresentation string) *Parameter

DefaultValue sets the default value field and returns the receiver

func (*Parameter) Description 

func (p *Parameter) Description(doc string) *Parameter

Description sets the description value field and returns the receiver

func (*Parameter) Kind 

func (p *Parameter) Kind() int

Kind returns the parameter type indicator (see const for valid values)

func (*Parameter) Required 

func (p *Parameter) Required(required bool) *Parameter

Required sets the required field and returns the receiver

type ParameterData 

type ParameterData struct {
	Name, Description, DataType, DataFormat string
	Kind                                    int
	Required                                bool
	AllowableValues                         map[string]string
	AllowMultiple                           bool
	DefaultValue                            string
}

ParameterData represents the state of a Parameter. It is made public to make it accessible to e.g. the Swagger package.

type RecoverHandleFunction 

type RecoverHandleFunction func(interface{}, http.ResponseWriter)

RecoverHandleFunction declares functions that can be used to handle a panic situation. The first argument is what recover() returns. The second must be used to communicate an error response.

type Request 

type Request struct {
	Request *http.Request
	// contains filtered or unexported fields
}

Request is a wrapper for a http Request that provides convenience methods

func NewRequest added in v1.1.0 

func NewRequest(httpRequest *http.Request) *Request

func (Request) Attribute 

func (r Request) Attribute(name string) interface{}

Attribute returns the value associated to the given name. Returns nil if absent.

func (*Request) BodyParameter 

func (r *Request) BodyParameter(name string) (string, error)

BodyParameter parses the body of the request (once for typically a POST or a PUT) and returns the value of the given name or an error.

func (*Request) HeaderParameter 

func (r *Request) HeaderParameter(name string) string

HeaderParameter returns the HTTP Header value of a Header name or empty if missing

func (*Request) PathParameter 

func (r *Request) PathParameter(name string) string

PathParameter accesses the Path parameter value by its name

func (*Request) PathParameters 

func (r *Request) PathParameters() map[string]string

PathParameters accesses the Path parameter values

func (*Request) QueryParameter 

func (r *Request) QueryParameter(name string) string

QueryParameter returns the (first) Query parameter value by its name

func (*Request) ReadEntity 

func (r *Request) ReadEntity(entityPointer interface{}) (err error)

ReadEntity checks the Accept header and reads the content into the entityPointer.

func (Request) SelectedRoutePath 

func (r Request) SelectedRoutePath() string

SelectedRoutePath root path + route path that matched the request, e.g. /meetings/{id}/attendees

func (*Request) SetAttribute 

func (r *Request) SetAttribute(name string, value interface{})

SetAttribute adds or replaces the attribute with the given value.

type Response 

type Response struct {
	http.ResponseWriter
	// contains filtered or unexported fields
}

Response is a wrapper on the actual http ResponseWriter It provides several convenience methods to prepare and write response content.

func NewResponse 

func NewResponse(httpWriter http.ResponseWriter) *Response

NewResponse creates a new response based on a http ResponseWriter.

func (Response) AddHeader 

func (r Response) AddHeader(header string, value string) Response

AddHeader is a shortcut for .Header().Add(header,value)

func (Response) CloseNotify 

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

CloseNotify is part of http.CloseNotifier interface

func (Response) ContentLength 

func (r Response) ContentLength() int

ContentLength returns the number of bytes written for the response content. Note that this value is only correct if all data is written through the Response using its Write* methods. Data written directly using the underlying http.ResponseWriter is not accounted for.

func (*Response) EntityWriter 

func (r *Response) EntityWriter() (EntityReaderWriter, bool)

EntityWriter returns the registered EntityWriter that the entity (requested resource) can write according to what the request wants (Accept) and what the Route can produce or what the restful defaults say. If called before WriteEntity and WriteHeader then a false return value can be used to write a 406: Not Acceptable.

func (Response) Error 

func (r Response) Error() error

Error returns the err created by WriteError

func (*Response) Flush 

func (r *Response) Flush()

Flush implements http.Flusher interface, which sends any buffered data to the client.

func (*Response) Hijack 

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

Hijack implements the http.Hijacker interface. This expands the Response to fulfill http.Hijacker if the underlying http.ResponseWriter supports it.

func (Response) InternalServerError 

func (r Response) InternalServerError() Response

InternalServerError writes the StatusInternalServerError header. DEPRECATED, use WriteErrorString(http.StatusInternalServerError,reason)

func (*Response) PrettyPrint added in v1.1.3 

func (r *Response) PrettyPrint(bePretty bool)

PrettyPrint changes whether this response must produce pretty (line-by-line, indented) JSON or XML output.

func (*Response) SetRequestAccepts added in v1.1.3 

func (r *Response) SetRequestAccepts(mime string)

SetRequestAccepts tells the response what Mime-type(s) the HTTP request said it wants to accept. Exposed for testing.

func (Response) StatusCode 

func (r Response) StatusCode() int

StatusCode returns the code that has been written using WriteHeader.

func (*Response) Write 

func (r *Response) Write(bytes []byte) (int, error)

Write writes the data to the connection as part of an HTTP reply. Write is part of http.ResponseWriter interface.

func (*Response) WriteAsJson 

func (r *Response) WriteAsJson(value interface{}) error

WriteAsJson is a convenience method for writing a value in json. It uses the standard encoding/json package for marshalling the value ; not using a registered EntityReaderWriter.

func (*Response) WriteAsXml 

func (r *Response) WriteAsXml(value interface{}) error

WriteAsXml is a convenience method for writing a value in xml (requires Xml tags on the value) It uses the standard encoding/xml package for marshalling the value ; not using a registered EntityReaderWriter.

func (*Response) WriteEntity 

func (r *Response) WriteEntity(value interface{}) error

WriteEntity calls WriteHeaderAndEntity with Http Status OK (200)

func (*Response) WriteError 

func (r *Response) WriteError(httpStatus int, err error) error

WriteError write the http status and the error string on the response.

func (*Response) WriteErrorString 

func (r *Response) WriteErrorString(httpStatus int, errorReason string) error

WriteErrorString is a convenience method for an error status with the actual error

func (*Response) WriteHeader 

func (r *Response) WriteHeader(httpStatus int)

WriteHeader is overridden to remember the Status Code that has been written. Changes to the Header of the response have no effect after this.

func (*Response) WriteHeaderAndEntity 

func (r *Response) WriteHeaderAndEntity(status int, value interface{}) error

WriteHeaderAndEntity marshals the value using the representation denoted by the Accept Header and the registered EntityWriters. If no Accept header is specified (or */*) then respond with the Content-Type as specified by the first in the Route.Produces. If an Accept header is specified then respond with the Content-Type as specified by the first in the Route.Produces that is matched with the Accept header. If the value is nil then no response is send except for the Http status. You may want to call WriteHeader(http.StatusNotFound) instead. If there is no writer available that can represent the value in the requested MIME type then Http Status NotAcceptable is written. Current implementation ignores any q-parameters in the Accept Header. Returns an error if the value could not be written on the response.

func (*Response) WriteHeaderAndJson 

func (r *Response) WriteHeaderAndJson(status int, value interface{}, contentType string) error

WriteHeaderAndJson is a convenience method for writing the status and a value in Json with a given Content-Type. It uses the standard encoding/json package for marshalling the value ; not using a registered EntityReaderWriter.

func (*Response) WriteHeaderAndXml 

func (r *Response) WriteHeaderAndXml(status int, value interface{}) error

WriteHeaderAndXml is a convenience method for writing a status and value in xml (requires Xml tags on the value) It uses the standard encoding/xml package for marshalling the value ; not using a registered EntityReaderWriter.

func (*Response) WriteJson 

func (r *Response) WriteJson(value interface{}, contentType string) error

WriteJson is a convenience method for writing a value in Json with a given Content-Type. It uses the standard encoding/json package for marshalling the value ; not using a registered EntityReaderWriter.

func (*Response) WriteServiceError 

func (r *Response) WriteServiceError(httpStatus int, err ServiceError) error

WriteServiceError is a convenience method for a responding with a status and a ServiceError

type ResponseError added in v1.1.3 

type ResponseError struct {
	Code      int
	Message   string
	Model     interface{}
	IsDefault bool
}

ResponseError represents a response; not necessarily an error.

type Route 

type Route struct {
	Method   string
	Produces []string
	Consumes []string
	Path     string // webservice root path + described path
	Function RouteFunction
	Filters  []FilterFunction
	If       []RouteSelectionConditionFunction

	// documentation
	Doc                     string
	Notes                   string
	Operation               string
	ParameterDocs           []*Parameter
	ResponseErrors          map[int]ResponseError
	ReadSample, WriteSample interface{} // structs that model an example request or response payload

	// Extra information used to store custom information about the route.
	Metadata map[string]interface{}
	// contains filtered or unexported fields
}

Route binds a HTTP Method,Path,Consumes combination to a RouteFunction.

func (Route) String 

func (r Route) String() string

for debugging

type RouteBuilder 

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

RouteBuilder is a helper to construct Routes.

func (*RouteBuilder) Build 

func (b *RouteBuilder) Build() Route

Build creates a new Route using the specification details collected by the RouteBuilder

func (*RouteBuilder) Consumes 

func (b *RouteBuilder) Consumes(mimeTypes ...string) *RouteBuilder

Consumes specifies what MIME types can be consumes ; the Accept Http header must matched any of these

func (*RouteBuilder) DefaultReturns 

func (b *RouteBuilder) DefaultReturns(message string, model interface{}) *RouteBuilder

DefaultReturns is a special Returns call that sets the default of the response ; the code is zero.

func (*RouteBuilder) Do added in v1.1.3 

func (b *RouteBuilder) Do(oneArgBlocks ...func(*RouteBuilder)) *RouteBuilder

Do evaluates each argument with the RouteBuilder itself. This allows you to follow DRY principles without breaking the fluent programming style. Example: 

ws.Route(ws.DELETE("/{name}").To(t.deletePerson).Do(Returns200, Returns500))

func Returns500(b *RouteBuilder) {
	b.Returns(500, "Internal Server Error", restful.ServiceError{})
}

func (*RouteBuilder) Doc 

func (b *RouteBuilder) Doc(documentation string) *RouteBuilder

Doc tells what this route is all about. Optional.

func (*RouteBuilder) Filter 

func (b *RouteBuilder) Filter(filter FilterFunction) *RouteBuilder

Filter appends a FilterFunction to the end of filters for this Route to build.

func (*RouteBuilder) If 

func (b *RouteBuilder) If(condition RouteSelectionConditionFunction) *RouteBuilder

If sets a condition function that controls matching the Route based on custom logic. The condition function is provided the HTTP request and should return true if the route should be considered.

Efficiency note: the condition function is called before checking the method, produces, and consumes criteria, so that the correct HTTP status code can be returned.

Lifecycle note: no filter functions have been called prior to calling the condition function, so the condition function should not depend on any context that might be set up by container or route filters.

func (*RouteBuilder) Metadata 

func (b *RouteBuilder) Metadata(key string, value interface{}) *RouteBuilder

Metadata adds or updates a key=value pair to the metadata map.

func (*RouteBuilder) Method 

func (b *RouteBuilder) Method(method string) *RouteBuilder

Method specifies what HTTP method to match. Required.

func (*RouteBuilder) Notes added in v1.1.3 

func (b *RouteBuilder) Notes(notes string) *RouteBuilder

Notes is a verbose explanation of the operation behavior. Optional.

func (*RouteBuilder) Operation 

func (b *RouteBuilder) Operation(name string) *RouteBuilder

Operation allows you to document what the actual method/function call is of the Route. Unless called, the operation name is derived from the RouteFunction set using To(..).

func (*RouteBuilder) Param 

func (b *RouteBuilder) Param(parameter *Parameter) *RouteBuilder

Param allows you to document the parameters of the Route. It adds a new Parameter (does not check for duplicates).

func (RouteBuilder) ParameterNamed added in v1.1.2 

func (b RouteBuilder) ParameterNamed(name string) (p *Parameter)

ParameterNamed returns a Parameter already known to the RouteBuilder. Returns nil if not. Use this to modify or extend information for the Parameter (through its Data()).

func (*RouteBuilder) Path 

func (b *RouteBuilder) Path(subPath string) *RouteBuilder

Path specifies the relative (w.r.t WebService root path) URL path to match. Default is "/".

func (*RouteBuilder) Produces 

func (b *RouteBuilder) Produces(mimeTypes ...string) *RouteBuilder

Produces specifies what MIME types can be produced ; the matched one will appear in the Content-Type Http header.

func (*RouteBuilder) Reads 

func (b *RouteBuilder) Reads(sample interface{}) *RouteBuilder

Reads tells what resource type will be read from the request payload. Optional. A parameter of type "body" is added ,required is set to true and the dataType is set to the qualified name of the sample's type.

func (*RouteBuilder) Returns added in v1.1.3 

func (b *RouteBuilder) Returns(code int, message string, model interface{}) *RouteBuilder

Returns allows you to document what responses (errors or regular) can be expected. The model parameter is optional ; either pass a struct instance or use nil if not applicable.

func (*RouteBuilder) ReturnsError added in v1.1.3 

func (b *RouteBuilder) ReturnsError(code int, message string, model interface{}) *RouteBuilder

ReturnsError is deprecated, use Returns instead.

func (*RouteBuilder) To 

func (b *RouteBuilder) To(function RouteFunction) *RouteBuilder

To bind the route to a function. If this route is matched with the incoming Http Request then call this function with the *Request,*Response pair. Required.

func (*RouteBuilder) Writes 

func (b *RouteBuilder) Writes(sample interface{}) *RouteBuilder

Writes tells what resource type will be written as the response payload. Optional.

type RouteFunction 

type RouteFunction func(*Request, *Response)

RouteFunction declares the signature of a function that can be bound to a Route.

type RouteSelectionConditionFunction 

type RouteSelectionConditionFunction func(httpRequest *http.Request) bool

RouteSelectionConditionFunction declares the signature of a function that can be used to add extra conditional logic when selecting whether the route matches the HTTP request.

type RouteSelector 

type RouteSelector interface {

	// SelectRoute finds a Route given the input HTTP Request and a list of WebServices.
	// It returns a selected Route and its containing WebService or an error indicating
	// a problem.
	SelectRoute(
		webServices []*WebService,
		httpRequest *http.Request) (selectedService *WebService, selected *Route, err error)
}

A RouteSelector finds the best matching Route given the input HTTP Request

type RouterJSR311 

type RouterJSR311 struct{}

RouterJSR311 implements the flow for matching Requests to Routes (and consequently Resource Functions) as specified by the JSR311 http://jsr311.java.net/nonav/releases/1.1/spec/spec.html. RouterJSR311 implements the Router interface. Concept of locators is not implemented.

func (RouterJSR311) SelectRoute 

func (r RouterJSR311) SelectRoute(
	webServices []*WebService,
	httpRequest *http.Request) (selectedService *WebService, selectedRoute *Route, err error)

SelectRoute is part of the Router interface and returns the best match for the WebService and its Route for the given Request.

type ServiceError 

type ServiceError struct {
	Code    int
	Message string
}

ServiceError is a transport object to pass information about a non-Http error occurred in a WebService while processing a request.

Example 
resp := new(Response)
resp.WriteEntity(NewError(http.StatusBadRequest, "Non-integer {id} path parameter"))

Output:

func NewError 

func NewError(code int, message string) ServiceError

NewError returns a ServiceError using the code and reason

func (ServiceError) Error 

func (s ServiceError) Error() string

Error returns a text representation of the service error

type ServiceErrorHandleFunction 

type ServiceErrorHandleFunction func(ServiceError, *Request, *Response)

ServiceErrorHandleFunction declares functions that can be used to handle a service error situation. The first argument is the service error, the second is the request that resulted in the error and the third must be used to communicate an error response.

type SyncPoolCompessors 

type SyncPoolCompessors struct {
	GzipWriterPool *sync.Pool
	GzipReaderPool *sync.Pool
	ZlibWriterPool *sync.Pool
}

SyncPoolCompessors is a CompressorProvider that use the standard sync.Pool.

func NewSyncPoolCompessors 

func NewSyncPoolCompessors() *SyncPoolCompessors

NewSyncPoolCompessors returns a new ("empty") SyncPoolCompessors.

func (*SyncPoolCompessors) AcquireGzipReader 

func (s *SyncPoolCompessors) AcquireGzipReader() *gzip.Reader

func (*SyncPoolCompessors) AcquireGzipWriter 

func (s *SyncPoolCompessors) AcquireGzipWriter() *gzip.Writer

func (*SyncPoolCompessors) AcquireZlibWriter 

func (s *SyncPoolCompessors) AcquireZlibWriter() *zlib.Writer

func (*SyncPoolCompessors) ReleaseGzipReader 

func (s *SyncPoolCompessors) ReleaseGzipReader(r *gzip.Reader)

func (*SyncPoolCompessors) ReleaseGzipWriter 

func (s *SyncPoolCompessors) ReleaseGzipWriter(w *gzip.Writer)

func (*SyncPoolCompessors) ReleaseZlibWriter 

func (s *SyncPoolCompessors) ReleaseZlibWriter(w *zlib.Writer)

type TypeNameHandleFunction 

type TypeNameHandleFunction func(sample interface{}) string

TypeNameHandleFunction declares functions that can handle translating the name of a sample object into the restful documentation for the service.

type WebService 

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

WebService holds a collection of Route values that bind a Http Method + URL Path to a function.

func RegisteredWebServices 

func RegisteredWebServices() []*WebService

RegisteredWebServices returns the collections of WebServices from the DefaultContainer

func (*WebService) ApiVersion added in v1.1.3 

func (w *WebService) ApiVersion(apiVersion string) *WebService

ApiVersion sets the API version for documentation purposes.

func (*WebService) BodyParameter 

func (w *WebService) BodyParameter(name, description string) *Parameter

BodyParameter creates a new Parameter of kind Body for documentation purposes. It is initialized as required without a DataType.

func (*WebService) Consumes 

func (w *WebService) Consumes(accepts ...string) *WebService

Consumes specifies that this WebService can consume one or more MIME types. Http requests must have one of these values set for the Content-Type header.

func (*WebService) DELETE 

func (w *WebService) DELETE(subPath string) *RouteBuilder

DELETE is a shortcut for .Method("DELETE").Path(subPath)

func (*WebService) Doc 

func (w *WebService) Doc(plainText string) *WebService

Doc is used to set the documentation of this service.

func (*WebService) Documentation 

func (w *WebService) Documentation() string

Documentation returns it.

func (*WebService) Filter 

func (w *WebService) Filter(filter FilterFunction) *WebService

Filter adds a filter function to the chain of filters applicable to all its Routes

func (*WebService) FormParameter 

func (w *WebService) FormParameter(name, description string) *Parameter

FormParameter creates a new Parameter of kind Form (using application/x-www-form-urlencoded) for documentation purposes. It is initialized as required with string as its DataType.

func (*WebService) GET 

func (w *WebService) GET(subPath string) *RouteBuilder

GET is a shortcut for .Method("GET").Path(subPath)

func (*WebService) HEAD 

func (w *WebService) HEAD(subPath string) *RouteBuilder

HEAD is a shortcut for .Method("HEAD").Path(subPath)

func (*WebService) HeaderParameter 

func (w *WebService) HeaderParameter(name, description string) *Parameter

HeaderParameter creates a new Parameter of kind (Http) Header for documentation purposes. It is initialized as not required with string as its DataType.

func (*WebService) Method 

func (w *WebService) Method(httpMethod string) *RouteBuilder

Method creates a new RouteBuilder and initialize its http method

func (*WebService) PATCH 

func (w *WebService) PATCH(subPath string) *RouteBuilder

PATCH is a shortcut for .Method("PATCH").Path(subPath)

func (*WebService) POST 

func (w *WebService) POST(subPath string) *RouteBuilder

POST is a shortcut for .Method("POST").Path(subPath)

func (*WebService) PUT 

func (w *WebService) PUT(subPath string) *RouteBuilder

PUT is a shortcut for .Method("PUT").Path(subPath)

func (*WebService) Param 

func (w *WebService) Param(parameter *Parameter) *WebService

Param adds a PathParameter to document parameters used in the root path.

func (*WebService) Path 

func (w *WebService) Path(root string) *WebService

Path specifies the root URL template path of the WebService. All Routes will be relative to this path.

func (*WebService) PathParameter 

func (w *WebService) PathParameter(name, description string) *Parameter

PathParameter creates a new Parameter of kind Path for documentation purposes. It is initialized as required with string as its DataType.

func (*WebService) PathParameters 

func (w *WebService) PathParameters() []*Parameter

PathParameters return the path parameter names for (shared among its Routes)

func (*WebService) Produces 

func (w *WebService) Produces(contentTypes ...string) *WebService

Produces specifies that this WebService can produce one or more MIME types. Http requests must have one of these values set for the Accept header.

func (*WebService) QueryParameter 

func (w *WebService) QueryParameter(name, description string) *Parameter

QueryParameter creates a new Parameter of kind Query for documentation purposes. It is initialized as not required with string as its DataType.

func (*WebService) RemoveRoute 

func (w *WebService) RemoveRoute(path, method string) error

RemoveRoute removes the specified route, looks for something that matches 'path' and 'method'

func (*WebService) RootPath 

func (w *WebService) RootPath() string

RootPath returns the RootPath associated with this WebService. Default "/"

func (*WebService) Route 

func (w *WebService) Route(builder *RouteBuilder) *WebService

Route creates a new Route using the RouteBuilder and add to the ordered list of Routes.

func (*WebService) Routes 

func (w *WebService) Routes() []Route

Routes returns the Routes associated with this WebService

func (*WebService) SetDynamicRoutes 

func (w *WebService) SetDynamicRoutes(enable bool)

func (*WebService) TypeNameHandler 

func (w *WebService) TypeNameHandler(handler TypeNameHandleFunction) *WebService

TypeNameHandler sets the function that will convert types to strings in the parameter and model definitions. If not set, the web service will invoke reflect.TypeOf(object).String().

func (*WebService) Version added in v1.1.3 

func (w *WebService) Version() string

Version returns the API version for documentation purposes.

Source Files

View all Source files

Directories

Path Synopsis
google_app_engine
google_app_engine/datastore
msgpack

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