113 lines
2.7 KiB
Go
113 lines
2.7 KiB
Go
package aicra
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import (
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"log"
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"net/http"
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"strings"
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"git.xdrm.io/go/aicra/api"
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"git.xdrm.io/go/aicra/internal/reqdata"
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)
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// httpServer wraps the aicra server to allow handling http requests
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type httpServer Server
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// ServeHTTP implements http.Handler and has to be called on each request
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func (s httpServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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defer r.Body.Close()
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// 1. build API request from HTTP request
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request, err := api.NewRequest(r)
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if err != nil {
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log.Fatal(err)
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}
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// 2. find a matching service for this path in the config
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serviceDef, pathIndex := s.services.Browse(request.URI)
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if serviceDef == nil {
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return
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}
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servicePath := strings.Join(request.URI[:pathIndex], "/")
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if !strings.HasPrefix(servicePath, "/") {
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servicePath = "/" + servicePath
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}
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// 3. check if matching methodDef exists in config */
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var methodDef = serviceDef.Method(r.Method)
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if methodDef == nil {
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response := api.NewResponse(api.ErrorUnknownMethod())
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response.ServeHTTP(w, r)
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logError(response)
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return
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}
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// 4. parse every input data from the request
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store := reqdata.New(request.URI[pathIndex:], r)
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/* (4) Check parameters
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---------------------------------------------------------*/
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parameters, paramError := s.extractParameters(store, methodDef.Parameters)
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// Fail if argument check failed
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if paramError.Code != api.ErrorSuccess().Code {
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response := api.NewResponse(paramError)
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response.ServeHTTP(w, r)
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logError(response)
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return
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}
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request.Param = parameters
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/* (5) Search a matching handler
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---------------------------------------------------------*/
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var serviceHandler *api.Handler
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var serviceFound bool
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for _, handler := range s.handlers {
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if handler.GetPath() == servicePath {
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serviceFound = true
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if handler.GetMethod() == r.Method {
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serviceHandler = handler
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}
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}
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}
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// fail if found no handler
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if serviceHandler == nil {
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if serviceFound {
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response := api.NewResponse()
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response.SetError(api.ErrorUncallableMethod(), servicePath, r.Method)
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response.ServeHTTP(w, r)
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logError(response)
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return
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}
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response := api.NewResponse()
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response.SetError(api.ErrorUncallableService(), servicePath)
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response.ServeHTTP(w, r)
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logError(response)
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return
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}
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/* (6) Execute handler and return response
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---------------------------------------------------------*/
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// 1. feed request with configuration scope
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request.Scope = methodDef.Scope
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// 1. execute
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response := api.NewResponse()
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serviceHandler.Handle(*request, response)
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// 2. apply headers
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for key, values := range response.Headers {
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for _, value := range values {
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w.Header().Add(key, value)
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}
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}
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// 3. write to response
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response.ServeHTTP(w, r)
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return
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}
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