mirror of
https://github.com/caddyserver/caddy.git
synced 2024-12-18 11:13:36 +08:00
109 lines
3.7 KiB
Go
109 lines
3.7 KiB
Go
package caddyhttp
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import (
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"context"
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"fmt"
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"log"
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"net/http"
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"strconv"
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"bitbucket.org/lightcodelabs/caddy2"
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"bitbucket.org/lightcodelabs/caddy2/modules/caddytls"
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)
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// Server is an HTTP server.
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type Server struct {
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Listen []string `json:"listen,omitempty"`
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ReadTimeout caddy2.Duration `json:"read_timeout,omitempty"`
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ReadHeaderTimeout caddy2.Duration `json:"read_header_timeout,omitempty"`
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Routes RouteList `json:"routes,omitempty"`
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Errors *httpErrorConfig `json:"errors,omitempty"`
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TLSConnPolicies caddytls.ConnectionPolicies `json:"tls_connection_policies,omitempty"`
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DisableAutoHTTPS bool `json:"disable_auto_https,omitempty"`
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DisableAutoHTTPSRedir bool `json:"disable_auto_https_redir,omitempty"`
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MaxRehandles int `json:"max_rehandles,omitempty"`
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tlsApp *caddytls.TLS
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}
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// ServeHTTP is the entry point for all HTTP requests.
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func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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if s.tlsApp.HandleHTTPChallenge(w, r) {
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return
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}
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// set up the context for the request
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repl := caddy2.NewReplacer()
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ctx := context.WithValue(r.Context(), caddy2.ReplacerCtxKey, repl)
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ctx = context.WithValue(ctx, TableCtxKey, make(map[string]interface{})) // TODO: Implement this
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r = r.WithContext(ctx)
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// once the pointer to the request won't change
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// anymore, finish setting up the replacer
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addHTTPVarsToReplacer(repl, r, w)
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// build and execute the main handler chain
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stack, w := s.Routes.BuildCompositeRoute(w, r)
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err := s.executeCompositeRoute(w, r, stack)
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if err != nil {
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// add the raw error value to the request context
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// so it can be accessed by error handlers
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c := context.WithValue(r.Context(), ErrorCtxKey, err)
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r = r.WithContext(c)
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// add error values to the replacer
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repl.Set("http.error", err.Error())
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if handlerErr, ok := err.(HandlerError); ok {
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repl.Set("http.error.status_code", strconv.Itoa(handlerErr.StatusCode))
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repl.Set("http.error.status_text", http.StatusText(handlerErr.StatusCode))
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repl.Set("http.error.message", handlerErr.Message)
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repl.Set("http.error.trace", handlerErr.Trace)
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repl.Set("http.error.id", handlerErr.ID)
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}
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if len(s.Errors.Routes) == 0 {
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// TODO: polish the default error handling
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log.Printf("[ERROR] Handler: %s", err)
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if handlerErr, ok := err.(HandlerError); ok {
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w.WriteHeader(handlerErr.StatusCode)
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}
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} else {
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errStack, w := s.Errors.Routes.BuildCompositeRoute(w, r)
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err := s.executeCompositeRoute(w, r, errStack)
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if err != nil {
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// TODO: what should we do if the error handler has an error?
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log.Printf("[ERROR] handling error: %v", err)
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}
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}
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}
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}
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// executeCompositeRoute executes stack with w and r. This function handles
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// the special ErrRehandle error value, which reprocesses requests through
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// the stack again. Any error value returned from this function would be an
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// actual error that needs to be handled.
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func (s *Server) executeCompositeRoute(w http.ResponseWriter, r *http.Request, stack Handler) error {
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var err error
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for i := -1; i <= s.MaxRehandles; i++ {
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// we started the counter at -1 because we
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// always want to run this at least once
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err = stack.ServeHTTP(w, r)
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if err != ErrRehandle {
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break
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}
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if i >= s.MaxRehandles-1 {
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return fmt.Errorf("too many rehandles")
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}
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}
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return err
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}
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type httpErrorConfig struct {
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Routes RouteList `json:"routes,omitempty"`
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// TODO: some way to configure the logging of errors, probably? standardize
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// the logging configuration first.
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}
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// TableCtxKey is the context key for the request's variable table.
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const TableCtxKey caddy2.CtxKey = "table"
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