151 lines
3.4 KiB
Go
151 lines
3.4 KiB
Go
package aicra
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import (
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"log"
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"net/http"
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"os"
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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/config"
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"git.xdrm.io/go/aicra/internal/reqdata"
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checker "git.xdrm.io/go/aicra/typecheck"
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)
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// Server represents an AICRA instance featuring: type checkers, services
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type Server struct {
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services *config.Service
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checkers *checker.Set
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handlers []*api.Handler
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}
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// New creates a framework instance from a configuration file
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func New(configPath string) (*Server, error) {
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var err error
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// 1. init instance
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var i = &Server{
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services: nil,
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checkers: checker.New(),
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handlers: make([]*api.Handler, 0),
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}
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// 2. open config file
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configFile, err := os.Open(configPath)
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if err != nil {
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return nil, err
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}
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defer configFile.Close()
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// 3. load configuration
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i.services, err = config.Parse(configFile)
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if err != nil {
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return nil, err
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}
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/* 3. Load type registry */
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// TODO: add methods on the checker to set types programmatically
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/* 4. Load middleware registry */
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// TODO: add methods to set them manually
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return i, nil
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}
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// ServeHTTP implements http.Handler and has to be called on each request
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func (s *Server) ServeHTTP(res http.ResponseWriter, req *http.Request) {
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defer req.Body.Close()
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// 1. build API request from HTTP request
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apiRequest, err := api.NewRequest(req)
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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(apiRequest.URI)
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if serviceDef == nil {
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return
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}
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servicePath := strings.Join(apiRequest.URI[:pathIndex], "/")
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// 3. check if matching method exists in config */
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var method = serviceDef.Method(req.Method)
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if method == nil {
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httpError(res, api.ErrorUnknownMethod())
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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(req)
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/* (4) Check parameters
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---------------------------------------------------------*/
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parameters, paramError := s.extractParameters(store, method.Parameters)
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// Fail if argument check failed
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if paramError.Code != api.ErrorSuccess().Code {
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httpError(res, paramError)
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return
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}
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apiRequest.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() == req.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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httpError(res, api.ErrorUnknownMethod())
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return
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}
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httpError(res, api.ErrorUnknownService())
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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. execute
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apiResponse := api.NewResponse()
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serviceHandler.Handle(*apiRequest, apiResponse)
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// 2. apply headers
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for key, values := range apiResponse.Headers {
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for _, value := range values {
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res.Header().Add(key, value)
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}
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}
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// 3. build JSON apiResponse
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httpPrint(res, apiResponse)
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return
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}
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// HandleFunc sets a new handler for an HTTP method to a path
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func (s *Server) HandleFunc(httpMethod, path string, handlerFunc api.HandlerFunc) {
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handler := api.NewHandler(httpMethod, path, handlerFunc)
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s.handlers = append(s.handlers, handler)
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}
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// Handle sets a new handler
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func (s *Server) Handle(handler *api.Handler) {
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s.handlers = append(s.handlers, handler)
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}
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