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