tool: Add client-api-proxy (#73)

This commit is contained in:
Kegsay 2017-04-20 14:00:34 +01:00 committed by GitHub
parent fad7e9541b
commit db428174d2

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@ -0,0 +1,122 @@
package main
import (
"flag"
"fmt"
log "github.com/Sirupsen/logrus"
"net/http"
"net/http/httputil"
"net/url"
"os"
"strings"
"time"
)
const usage = `Usage: %s
Create a single endpoint URL which clients can be pointed at.
The client-server API in Dendrite is split across multiple processes
which listen on multiple ports. You cannot point a Matrix client at
any of those ports, as there will be unimplemented functionality.
In addition, all client-server API processes start with the additional
path prefix '/api', which Matrix clients will be unaware of.
This tool will proxy requests for all client-server URLs and forward
them to their respective process. It will also add the '/api' path
prefix to incoming requests.
THIS TOOL IS FOR TESTING AND NOT INTENDED FOR PRODUCTION USE.
Arguments:
`
var (
syncServerURL = flag.String("sync-server-url", "", "The base URL of the listening 'dendrite-sync-server' process. E.g. 'http://localhost:4200'")
clientAPIURL = flag.String("client-api-url", "", "The base URL of the listening 'dendrite-client-api' process. E.g. 'http://localhost:4321'")
bindAddress = flag.String("bind-address", ":8008", "The listening port for the proxy.")
)
func makeProxy(targetURL string) (*httputil.ReverseProxy, error) {
if !strings.HasSuffix(targetURL, "/") {
targetURL += "/"
}
// Check that we can parse the URL.
_, err := url.Parse(targetURL)
if err != nil {
return nil, err
}
return &httputil.ReverseProxy{
Director: func(req *http.Request) {
// URL.Path() removes the % escaping from the path.
// The % encoding will be added back when the url is encoded
// when the request is forwarded.
// This means that we will lose any unessecary escaping from the URL.
// Pratically this means that any distinction between '%2F' and '/'
// in the URL will be lost by the time it reaches the target.
path := req.URL.Path
path = "api" + path
log.WithFields(log.Fields{
"path": path,
"url": targetURL,
"method": req.Method,
}).Print("proxying request")
newURL, err := url.Parse(targetURL + path)
if err != nil {
// We already checked that we can parse the URL
// So this shouldn't ever get hit.
panic(err)
}
// Copy the query parameters from the request.
newURL.RawQuery = req.URL.RawQuery
req.URL = newURL
},
}, nil
}
func main() {
flag.Usage = func() {
fmt.Fprintf(os.Stderr, usage, os.Args[0])
flag.PrintDefaults()
}
flag.Parse()
if *syncServerURL == "" {
flag.Usage()
fmt.Fprintln(os.Stderr, "no --sync-server-url specified.")
os.Exit(1)
}
if *clientAPIURL == "" {
flag.Usage()
fmt.Fprintln(os.Stderr, "no --client-api-url specified.")
os.Exit(1)
}
syncProxy, err := makeProxy(*syncServerURL)
if err != nil {
panic(err)
}
clientProxy, err := makeProxy(*clientAPIURL)
if err != nil {
panic(err)
}
http.Handle("/_matrix/client/r0/sync", syncProxy)
http.Handle("/", clientProxy)
srv := &http.Server{
Addr: *bindAddress,
ReadTimeout: 1 * time.Minute, // how long we wait for the client to send the entire request (after connection accept)
WriteTimeout: 5 * time.Minute, // how long the proxy has to write the full response
}
fmt.Println("Proxying requests to:")
fmt.Println(" /_matrix/client/r0/sync => ", *syncServerURL+"/api/_matrix/client/r0/sync")
fmt.Println(" /* => ", *clientAPIURL+"/api/*")
fmt.Println("Listening on ", *bindAddress)
srv.ListenAndServe()
}