diff options
Diffstat (limited to 'kube2msb/src/vendor/github.com/emicklei/go-restful/container.go')
| -rw-r--r-- | kube2msb/src/vendor/github.com/emicklei/go-restful/container.go | 361 |
1 files changed, 0 insertions, 361 deletions
diff --git a/kube2msb/src/vendor/github.com/emicklei/go-restful/container.go b/kube2msb/src/vendor/github.com/emicklei/go-restful/container.go deleted file mode 100644 index 62ded27..0000000 --- a/kube2msb/src/vendor/github.com/emicklei/go-restful/container.go +++ /dev/null @@ -1,361 +0,0 @@ -package restful - -// Copyright 2013 Ernest Micklei. All rights reserved. -// Use of this source code is governed by a license -// that can be found in the LICENSE file. - -import ( - "bytes" - "errors" - "fmt" - "net/http" - "os" - "runtime" - "strings" - "sync" - - "github.com/emicklei/go-restful/log" -) - -// 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 -type Container struct { - webServicesLock sync.RWMutex - webServices []*WebService - ServeMux *http.ServeMux - isRegisteredOnRoot bool - containerFilters []FilterFunction - doNotRecover bool // default is false - recoverHandleFunc RecoverHandleFunction - serviceErrorHandleFunc ServiceErrorHandleFunction - router RouteSelector // default is a RouterJSR311, CurlyRouter is the faster alternative - contentEncodingEnabled bool // default is false -} - -// NewContainer creates a new Container using a new ServeMux and default router (RouterJSR311) -func NewContainer() *Container { - return &Container{ - webServices: []*WebService{}, - ServeMux: http.NewServeMux(), - isRegisteredOnRoot: false, - containerFilters: []FilterFunction{}, - doNotRecover: false, - recoverHandleFunc: logStackOnRecover, - serviceErrorHandleFunc: writeServiceError, - router: RouterJSR311{}, - contentEncodingEnabled: false} -} - -// 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 RecoverHandleFunction func(interface{}, http.ResponseWriter) - -// RecoverHandler changes the default function (logStackOnRecover) to be called -// when a panic is detected. DoNotRecover must be have its default value (=false). -func (c *Container) RecoverHandler(handler RecoverHandleFunction) { - c.recoverHandleFunc = handler -} - -// 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 ServiceErrorHandleFunction func(ServiceError, *Request, *Response) - -// ServiceErrorHandler changes the default function (writeServiceError) to be called -// when a ServiceError is detected. -func (c *Container) ServiceErrorHandler(handler ServiceErrorHandleFunction) { - c.serviceErrorHandleFunc = handler -} - -// 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 false = recover from panics. This has performance implications. -func (c *Container) DoNotRecover(doNot bool) { - c.doNotRecover = doNot -} - -// Router changes the default Router (currently RouterJSR311) -func (c *Container) Router(aRouter RouteSelector) { - c.router = aRouter -} - -// EnableContentEncoding (default=false) allows for GZIP or DEFLATE encoding of responses. -func (c *Container) EnableContentEncoding(enabled bool) { - c.contentEncodingEnabled = enabled -} - -// Add a WebService to the Container. It will detect duplicate root paths and exit in that case. -func (c *Container) Add(service *WebService) *Container { - c.webServicesLock.Lock() - defer c.webServicesLock.Unlock() - - // if rootPath was not set then lazy initialize it - if len(service.rootPath) == 0 { - service.Path("/") - } - - // cannot have duplicate root paths - for _, each := range c.webServices { - if each.RootPath() == service.RootPath() { - log.Printf("[restful] WebService with duplicate root path detected:['%v']", each) - os.Exit(1) - } - } - - // If not registered on root then add specific mapping - if !c.isRegisteredOnRoot { - c.isRegisteredOnRoot = c.addHandler(service, c.ServeMux) - } - c.webServices = append(c.webServices, service) - return c -} - -// addHandler may set a new HandleFunc for the serveMux -// this function must run inside the critical region protected by the webServicesLock. -// returns true if the function was registered on root ("/") -func (c *Container) addHandler(service *WebService, serveMux *http.ServeMux) bool { - pattern := fixedPrefixPath(service.RootPath()) - // check if root path registration is needed - if "/" == pattern || "" == pattern { - serveMux.HandleFunc("/", c.dispatch) - return true - } - // detect if registration already exists - alreadyMapped := false - for _, each := range c.webServices { - if each.RootPath() == service.RootPath() { - alreadyMapped = true - break - } - } - if !alreadyMapped { - serveMux.HandleFunc(pattern, c.dispatch) - if !strings.HasSuffix(pattern, "/") { - serveMux.HandleFunc(pattern+"/", c.dispatch) - } - } - return false -} - -func (c *Container) Remove(ws *WebService) error { - if c.ServeMux == http.DefaultServeMux { - errMsg := fmt.Sprintf("[restful] cannot remove a WebService from a Container using the DefaultServeMux: ['%v']", ws) - log.Printf(errMsg) - return errors.New(errMsg) - } - c.webServicesLock.Lock() - defer c.webServicesLock.Unlock() - // build a new ServeMux and re-register all WebServices - newServeMux := http.NewServeMux() - newServices := []*WebService{} - newIsRegisteredOnRoot := false - for _, each := range c.webServices { - if each.rootPath != ws.rootPath { - // If not registered on root then add specific mapping - if !newIsRegisteredOnRoot { - newIsRegisteredOnRoot = c.addHandler(each, newServeMux) - } - newServices = append(newServices, each) - } - } - c.webServices, c.ServeMux, c.isRegisteredOnRoot = newServices, newServeMux, newIsRegisteredOnRoot - return nil -} - -// logStackOnRecover is the default RecoverHandleFunction and is called -// when DoNotRecover is false and the recoverHandleFunc is not set for the container. -// Default implementation logs the stacktrace and writes the stacktrace on the response. -// This may be a security issue as it exposes sourcecode information. -func logStackOnRecover(panicReason interface{}, httpWriter http.ResponseWriter) { - var buffer bytes.Buffer - buffer.WriteString(fmt.Sprintf("[restful] recover from panic situation: - %v\r\n", panicReason)) - for i := 2; ; i += 1 { - _, file, line, ok := runtime.Caller(i) - if !ok { - break - } - buffer.WriteString(fmt.Sprintf(" %s:%d\r\n", file, line)) - } - log.Print(buffer.String()) - httpWriter.WriteHeader(http.StatusInternalServerError) - httpWriter.Write(buffer.Bytes()) -} - -// writeServiceError is the default ServiceErrorHandleFunction and is called -// when a ServiceError is returned during route selection. Default implementation -// calls resp.WriteErrorString(err.Code, err.Message) -func writeServiceError(err ServiceError, req *Request, resp *Response) { - resp.WriteErrorString(err.Code, err.Message) -} - -// Dispatch the incoming Http Request to a matching WebService. -func (c *Container) dispatch(httpWriter http.ResponseWriter, httpRequest *http.Request) { - writer := httpWriter - - // CompressingResponseWriter should be closed after all operations are done - defer func() { - if compressWriter, ok := writer.(*CompressingResponseWriter); ok { - compressWriter.Close() - } - }() - - // Instal panic recovery unless told otherwise - if !c.doNotRecover { // catch all for 500 response - defer func() { - if r := recover(); r != nil { - c.recoverHandleFunc(r, writer) - return - } - }() - } - // Install closing the request body (if any) - defer func() { - if nil != httpRequest.Body { - httpRequest.Body.Close() - } - }() - - // Detect if compression is needed - // assume without compression, test for override - if c.contentEncodingEnabled { - doCompress, encoding := wantsCompressedResponse(httpRequest) - if doCompress { - var err error - writer, err = NewCompressingResponseWriter(httpWriter, encoding) - if err != nil { - log.Print("[restful] unable to install compressor: ", err) - httpWriter.WriteHeader(http.StatusInternalServerError) - return - } - } - } - // Find best match Route ; err is non nil if no match was found - var webService *WebService - var route *Route - var err error - func() { - c.webServicesLock.RLock() - defer c.webServicesLock.RUnlock() - webService, route, err = c.router.SelectRoute( - c.webServices, - httpRequest) - }() - if err != nil { - // a non-200 response has already been written - // run container filters anyway ; they should not touch the response... - chain := FilterChain{Filters: c.containerFilters, Target: func(req *Request, resp *Response) { - switch err.(type) { - case ServiceError: - ser := err.(ServiceError) - c.serviceErrorHandleFunc(ser, req, resp) - } - // TODO - }} - chain.ProcessFilter(NewRequest(httpRequest), NewResponse(writer)) - return - } - wrappedRequest, wrappedResponse := route.wrapRequestResponse(writer, httpRequest) - // pass through filters (if any) - if len(c.containerFilters)+len(webService.filters)+len(route.Filters) > 0 { - // compose filter chain - allFilters := []FilterFunction{} - allFilters = append(allFilters, c.containerFilters...) - allFilters = append(allFilters, webService.filters...) - allFilters = append(allFilters, route.Filters...) - chain := FilterChain{Filters: allFilters, Target: func(req *Request, resp *Response) { - // handle request by route after passing all filters - route.Function(wrappedRequest, wrappedResponse) - }} - chain.ProcessFilter(wrappedRequest, wrappedResponse) - } else { - // no filters, handle request by route - route.Function(wrappedRequest, wrappedResponse) - } -} - -// fixedPrefixPath returns the fixed part of the partspec ; it may include template vars {} -func fixedPrefixPath(pathspec string) string { - varBegin := strings.Index(pathspec, "{") - if -1 == varBegin { - return pathspec - } - return pathspec[:varBegin] -} - -// ServeHTTP implements net/http.Handler therefore a Container can be a Handler in a http.Server -func (c Container) ServeHTTP(httpwriter http.ResponseWriter, httpRequest *http.Request) { - c.ServeMux.ServeHTTP(httpwriter, httpRequest) -} - -// Handle registers the handler for the given pattern. If a handler already exists for pattern, Handle panics. -func (c Container) Handle(pattern string, handler http.Handler) { - c.ServeMux.Handle(pattern, 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 (c *Container) HandleWithFilter(pattern string, handler http.Handler) { - f := func(httpResponse http.ResponseWriter, httpRequest *http.Request) { - if len(c.containerFilters) == 0 { - handler.ServeHTTP(httpResponse, httpRequest) - return - } - - chain := FilterChain{Filters: c.containerFilters, Target: func(req *Request, resp *Response) { - handler.ServeHTTP(httpResponse, httpRequest) - }} - chain.ProcessFilter(NewRequest(httpRequest), NewResponse(httpResponse)) - } - - c.Handle(pattern, http.HandlerFunc(f)) -} - -// Filter appends a container FilterFunction. These are called before dispatching -// a http.Request to a WebService from the container -func (c *Container) Filter(filter FilterFunction) { - c.containerFilters = append(c.containerFilters, filter) -} - -// RegisteredWebServices returns the collections of added WebServices -func (c Container) RegisteredWebServices() []*WebService { - c.webServicesLock.RLock() - defer c.webServicesLock.RUnlock() - result := make([]*WebService, len(c.webServices)) - for ix := range c.webServices { - result[ix] = c.webServices[ix] - } - return result -} - -// computeAllowedMethods returns a list of HTTP methods that are valid for a Request -func (c Container) computeAllowedMethods(req *Request) []string { - // Go through all RegisteredWebServices() and all its Routes to collect the options - methods := []string{} - requestPath := req.Request.URL.Path - for _, ws := range c.RegisteredWebServices() { - matches := ws.pathExpr.Matcher.FindStringSubmatch(requestPath) - if matches != nil { - finalMatch := matches[len(matches)-1] - for _, rt := range ws.Routes() { - matches := rt.pathExpr.Matcher.FindStringSubmatch(finalMatch) - if matches != nil { - lastMatch := matches[len(matches)-1] - if lastMatch == "" || lastMatch == "/" { // do not include if value is neither empty nor ‘/’. - methods = append(methods, rt.Method) - } - } - } - } - } - // methods = append(methods, "OPTIONS") not sure about this - return methods -} - -// newBasicRequestResponse creates a pair of Request,Response from its http versions. -// It is basic because no parameter or (produces) content-type information is given. -func newBasicRequestResponse(httpWriter http.ResponseWriter, httpRequest *http.Request) (*Request, *Response) { - resp := NewResponse(httpWriter) - resp.requestAccept = httpRequest.Header.Get(HEADER_Accept) - return NewRequest(httpRequest), resp -} |