forked from vladaionescu/leveros
/
proxyextout.go
158 lines (143 loc) · 4.49 KB
/
proxyextout.go
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package host
import (
"fmt"
"strconv"
"github.com/leveros/leveros/core"
"github.com/leveros/leveros/http2stream"
"github.com/leveros/leveros/leverutil"
)
func (proxy *LeverProxy) serveExt() (err error) {
listenAddr := ":" + EnvExtListenPortFlag.Get()
proxy.extLogger.WithFields("listenAddr", listenAddr).Info("Listening")
proxy.extListener, _, err = proxy.inServer.Serve(
"tcp", listenAddr, func(stream *http2stream.HTTP2Stream) {
proxy.handleExtOutStream("", stream, true)
})
if err != nil {
proxy.extLogger.WithFields("err", err, "listenAddr", listenAddr).Error(
"Error trying to listen")
}
return
}
func (proxy *LeverProxy) serveOut(env string, networkIP string) (err error) {
proxy.lock.Lock()
defer proxy.lock.Unlock()
_, ok := proxy.outListeners[env]
if ok {
// Already listening.
return nil
}
listenAddr := networkIP + ":" + EnvOutListenPortFlag.Get()
proxy.outLogger.WithFields("listenAddr", listenAddr).Info("Listening")
outListener, _, err := proxy.outServer.Serve(
"tcp", listenAddr,
func(stream *http2stream.HTTP2Stream) {
proxy.handleExtOutStream(env, stream, false)
})
if err != nil {
return err
}
proxy.outListeners[env] = outListener
return nil
}
// TODO: This is not yet used.
func (proxy *LeverProxy) stopServeOut(env string) (err error) {
proxy.lock.Lock()
defer proxy.lock.Unlock()
outListener, ok := proxy.outListeners[env]
if !ok {
return nil
}
err = outListener.Close()
if err != nil {
return err
}
delete(proxy.outListeners, env)
return nil
}
func (proxy *LeverProxy) handleExtOutStream(
srcEnv string, stream *http2stream.HTTP2Stream, isExtStream bool) {
streamLogger := proxy.outLogger
if isExtStream {
streamLogger = proxy.extLogger
}
headers := stream.GetHeaders()
err := expectHeaders(headers, "lever-url")
if err != nil {
streamLogger.WithFields("err", err).Error("")
stream.Write(&http2stream.MsgError{Err: err})
return
}
leverURL, err := core.ParseLeverURL(headers["lever-url"][0])
if err != nil {
proxy.inLogger.WithFields(
"err", err, "leverURL", headers["lever-url"][0]).Error(
"Unable to parse Lever URL")
}
if !core.IsInternalEnvironment(leverURL.Environment) {
err = fmt.Errorf("Cannot route to dest env")
streamLogger.WithFields(
"err", err,
"leverEnv", leverURL.Environment,
).Error("")
stream.Write(&http2stream.MsgError{Err: err})
return
}
streamID := leverutil.RandomID()
streamLogger.WithFields(
"leverURL", leverURL.String(),
"srcEnv", srcEnv,
"streamID", streamID,
).Debug("Receiving stream")
streamLogger = streamLogger.WithFields("streamID", streamID)
isFromExt := core.IsInternalEnvironment(srcEnv)
hostInfo, err := proxy.finder.GetHost(
leverURL.Environment, leverURL.Service, leverURL.Resource, isFromExt)
if err != nil {
streamLogger.WithFields(
"err", err,
"leverURL", leverURL.String(),
).Error("Error trying to find / allocate host for request")
stream.Write(&http2stream.MsgError{Err: err})
return
}
streamLogger.WithFields(
"leverInstanceID", hostInfo.InstanceID,
"containerID", hostInfo.ContainerID,
"servingID", hostInfo.ServingID,
"hostProxyAddr", hostInfo.HostAddr,
"isNewInstance", hostInfo.IsNewInstance,
).Debug("Routing to host proxy")
destStream, err := proxy.client.NewStream(hostInfo.HostAddr)
if err != nil {
streamLogger.WithFields(
"err", err,
"hostProxyAddr", hostInfo.HostAddr,
).Error("Error trying to create client stream to dest")
stream.Write(&http2stream.MsgError{Err: err})
return
}
addHeaders := make(map[string][]string)
addHeaders["x-lever-src-env"] = []string{srcEnv}
addHeaders["x-lever-dest-instance-id"] = []string{hostInfo.InstanceID}
addHeaders["x-lever-dest-container-id"] = []string{hostInfo.ContainerID}
addHeaders["x-lever-serving-id"] = []string{hostInfo.ServingID}
addHeaders["x-lever-code-version"] = []string{
strconv.Itoa(int(hostInfo.CodeVersion))}
addHeaders["x-lever-inst-resource-id"] = []string{
hostInfo.LevInstResourceID}
addHeaders["x-lever-inst-session-id"] = []string{hostInfo.LevInstSessionID}
addHeaders["x-lever-res-resource-id"] = []string{hostInfo.LevResResourceID}
addHeaders["x-lever-res-session-id"] = []string{hostInfo.LevResSessionID}
firstHeaders := true
stream.ProxyTo(
destStream,
func(msg http2stream.MsgItem) []http2stream.MsgItem {
proxy.client.KeepAlive(hostInfo.HostAddr)
return proxy.filterTo(&firstHeaders, addHeaders, msg)
},
func(msg http2stream.MsgItem) []http2stream.MsgItem {
proxy.client.KeepAlive(hostInfo.HostAddr)
return noFilter(msg)
})
}