144 lines
3.8 KiB
Go
144 lines
3.8 KiB
Go
// Copyright 2011 Google Inc. All rights reserved.
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// Use of this source code is governed by the Apache 2.0
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// license that can be found in the LICENSE file.
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// Package internal provides support for package appengine.
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//
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// Programs should not use this package directly. Its API is not stable.
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// Use packages appengine and appengine/* instead.
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package internal
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import (
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"fmt"
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"io"
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"log"
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"net/http"
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"net/url"
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"os"
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"github.com/golang/protobuf/proto"
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remotepb "google.golang.org/appengine/internal/remote_api"
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)
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// errorCodeMaps is a map of service name to the error code map for the service.
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var errorCodeMaps = make(map[string]map[int32]string)
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// RegisterErrorCodeMap is called from API implementations to register their
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// error code map. This should only be called from init functions.
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func RegisterErrorCodeMap(service string, m map[int32]string) {
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errorCodeMaps[service] = m
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}
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type timeoutCodeKey struct {
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service string
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code int32
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}
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// timeoutCodes is the set of service+code pairs that represent timeouts.
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var timeoutCodes = make(map[timeoutCodeKey]bool)
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func RegisterTimeoutErrorCode(service string, code int32) {
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timeoutCodes[timeoutCodeKey{service, code}] = true
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}
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// APIError is the type returned by appengine.Context's Call method
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// when an API call fails in an API-specific way. This may be, for instance,
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// a taskqueue API call failing with TaskQueueServiceError::UNKNOWN_QUEUE.
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type APIError struct {
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Service string
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Detail string
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Code int32 // API-specific error code
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}
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func (e *APIError) Error() string {
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if e.Code == 0 {
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if e.Detail == "" {
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return "APIError <empty>"
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}
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return e.Detail
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}
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s := fmt.Sprintf("API error %d", e.Code)
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if m, ok := errorCodeMaps[e.Service]; ok {
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s += " (" + e.Service + ": " + m[e.Code] + ")"
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} else {
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// Shouldn't happen, but provide a bit more detail if it does.
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s = e.Service + " " + s
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}
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if e.Detail != "" {
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s += ": " + e.Detail
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}
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return s
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}
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func (e *APIError) IsTimeout() bool {
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return timeoutCodes[timeoutCodeKey{e.Service, e.Code}]
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}
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// CallError is the type returned by appengine.Context's Call method when an
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// API call fails in a generic way, such as RpcError::CAPABILITY_DISABLED.
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type CallError struct {
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Detail string
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Code int32
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// TODO: Remove this if we get a distinguishable error code.
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Timeout bool
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}
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func (e *CallError) Error() string {
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var msg string
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switch remotepb.RpcError_ErrorCode(e.Code) {
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case remotepb.RpcError_UNKNOWN:
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return e.Detail
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case remotepb.RpcError_OVER_QUOTA:
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msg = "Over quota"
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case remotepb.RpcError_CAPABILITY_DISABLED:
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msg = "Capability disabled"
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case remotepb.RpcError_CANCELLED:
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msg = "Canceled"
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default:
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msg = fmt.Sprintf("Call error %d", e.Code)
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}
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s := msg + ": " + e.Detail
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if e.Timeout {
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s += " (timeout)"
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}
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return s
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}
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func (e *CallError) IsTimeout() bool {
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return e.Timeout
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}
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func Main() {
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installHealthChecker(http.DefaultServeMux)
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port := "8080"
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if s := os.Getenv("PORT"); s != "" {
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port = s
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}
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if err := http.ListenAndServe(":"+port, http.HandlerFunc(handleHTTP)); err != nil {
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log.Fatalf("http.ListenAndServe: %v", err)
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}
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}
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func installHealthChecker(mux *http.ServeMux) {
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// If no health check handler has been installed by this point, add a trivial one.
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const healthPath = "/_ah/health"
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hreq := &http.Request{
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Method: "GET",
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URL: &url.URL{
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Path: healthPath,
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},
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}
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if _, pat := mux.Handler(hreq); pat != healthPath {
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mux.HandleFunc(healthPath, func(w http.ResponseWriter, r *http.Request) {
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io.WriteString(w, "ok")
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})
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}
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}
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// NamespaceMods is a map from API service to a function that will mutate an RPC request to attach a namespace.
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// The function should be prepared to be called on the same message more than once; it should only modify the
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// RPC request the first time.
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var NamespaceMods = make(map[string]func(m proto.Message, namespace string))
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