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backendproxy.go
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backendproxy.go
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// Copyright 2019 Yunion
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package handler
import (
"context"
"fmt"
"net/http"
"net/url"
"strings"
"time"
"yunion.io/x/log"
"yunion.io/x/onecloud/pkg/appctx"
"yunion.io/x/onecloud/pkg/appsrv"
"yunion.io/x/onecloud/pkg/httperrors"
"yunion.io/x/onecloud/pkg/mcclient/auth"
"yunion.io/x/onecloud/pkg/proxy"
)
type SBackendServiceProxyHandler struct {
prefix string
}
func NewBackendServiceProxyHandler(prefix string) *SBackendServiceProxyHandler {
return &SBackendServiceProxyHandler{
prefix: prefix,
}
}
func removeLeadingSlash(p string) string {
for len(p) > 0 && p[0] == '/' {
p = p[1:]
}
return p
}
func (h *SBackendServiceProxyHandler) requestManipulator(ctx context.Context, r *http.Request) (*http.Request, error) {
// remove leading prefixes /api/s/<service>
path := r.URL.Path[len("/api/s/"):]
path = removeLeadingSlash(path)
slashPos := strings.Index(path, "/")
if slashPos <= 0 {
return r, httperrors.NewBadRequestError("invalid request URL %s", r.URL.Path)
}
path = path[slashPos:]
if strings.HasPrefix(path, "/r/") {
path = path[len("/r/"):]
path = removeLeadingSlash(path)
slashPos := strings.Index(path, "/")
if slashPos <= 0 {
return r, httperrors.NewBadRequestError("invalid request URL %s", r.URL.Path)
}
path = path[slashPos:]
if strings.HasPrefix(path, "/z/") {
path = path[len("/z/"):]
path = removeLeadingSlash(path)
slashPos := strings.Index(path, "/")
if slashPos <= 0 {
return r, httperrors.NewBadRequestError("invalid request URL %s", r.URL.Path)
}
path = path[slashPos:]
}
}
log.Debugf("Path: %s => %s", r.URL.Path, path)
r.URL = &url.URL{
Path: path,
RawQuery: r.URL.RawQuery,
Fragment: r.URL.Fragment,
}
return r, nil
}
func (h *SBackendServiceProxyHandler) Bind(app *appsrv.Application) {
app.AddReverseProxyHandlerWithCallbackConfig(
h.prefix, h.fetchReverseEndpoint(), h.requestManipulator,
func(method string, hi *appsrv.SHandlerInfo) *appsrv.SHandlerInfo {
if method == "OPTIONS" {
return nil
}
if method == "GET" || method == "PUT" || method == "POST" {
hi.SetProcessTimeout(6 * time.Hour)
}
var worker *appsrv.SWorkerManager
if method == "GET" || method == "HEAD" {
worker = appsrv.NewWorkerManager("apigateway-backend-api-read", 8, appsrv.DEFAULT_BACKLOG, false)
} else {
worker = appsrv.NewWorkerManager("apigateway-backend-api-write", 4, appsrv.DEFAULT_BACKLOG, false)
}
hi.SetWorkerManager(worker)
return hi
},
)
}
func (h *SBackendServiceProxyHandler) fetchReverseEndpoint() *proxy.SEndpointFactory {
f := func(ctx context.Context, r *http.Request) (string, error) {
params := appctx.AppContextParams(ctx)
serviceName := params["<service>"]
if len(serviceName) == 0 {
return "", httperrors.NewBadRequestError("no service")
}
path := r.URL.Path
serviceSeg := fmt.Sprintf("/api/s/%s/", serviceName)
pos := strings.Index(path, serviceSeg)
if pos < 0 {
return "", httperrors.NewBadRequestError("malformed URL, expect service")
}
path = path[pos+len(serviceSeg):]
path = removeLeadingSlash(path)
region := FetchRegion(r)
zone := ""
if strings.HasPrefix(path, "r/") {
path = path[len("r/"):]
path = removeLeadingSlash(path)
slashPos := strings.Index(path, "/")
if slashPos <= 0 {
return "", httperrors.NewBadRequestError("malformed URL, expect region")
}
region = path[:slashPos]
path = path[slashPos+1:]
if strings.HasPrefix(path, "z/") {
path = path[len("z/"):]
path = removeLeadingSlash(path)
slashPos := strings.Index(path, "/")
if slashPos <= 0 {
return "", httperrors.NewBadRequestError("malformed URL, expect zone")
}
zone = path[:slashPos]
}
}
endpointType := "internalURL"
session := auth.GetAdminSession(ctx, region)
if len(zone) > 0 {
session.SetZone(zone)
}
ep, err := session.GetServiceURL(serviceName, endpointType)
if err != nil {
return "", httperrors.NewBadRequestError("invalid service %s: %s", serviceName, err)
}
return getEndpointSchemeHost(ep)
}
return proxy.NewEndpointFactory(f, "backendService")
}