Initial commit of the OpenSource version.

This corresponds to nextcloud-spreed-signaling 0.0.13
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Joachim Bauch 2020-05-12 09:46:20 +02:00
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Version 3, 19 November 2007
Copyright (C) 2007 Free Software Foundation, Inc. <>
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Makefile Normal file
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@ -0,0 +1,113 @@
all: build
GO := $(shell which go)
GOPATH := "$(CURDIR)/vendor:$(CURDIR)"
BINDIR := "$(CURDIR)/bin"
VERSION := $(shell "$(CURDIR)/scripts/")
TARVERSION := $(shell "$(CURDIR)/scripts/" --tar)
ifneq ($(VERSION),)
ifneq ($(RACE),)
BUILDARGS := -race
ifneq ($(CI),)
TESTARGS := -race
ifeq ($(TIMEOUT),)
TIMEOUT := 60s
ifneq ($(TEST),)
[ ! -d "$(CURDIR)/.git/hooks" ] || ln -sf "$(CURDIR)/scripts/pre-commit.hook" "$(CURDIR)/.git/hooks/pre-commit"
GOPATH=$(GOPATH) $(GO) get -d
GOPATH=$(GOPATH) $(GO) build -o ./vendor/bin/easyjson ./vendor/src/
dependencies: hook godeps easyjson src/signaling/continentmap.go
GOPATH=$(GOPATH) ./vendor/bin/godeps -u dependencies.tsv
dependencies.tsv: godeps
set -e ;\
TMP=$$(mktemp -d) ;\
echo Make sure to remove $$TMP on error ;\
cp -r "$(CURDIR)/vendor" $$TMP ;\
GOPATH=$$TMP/vendor:"$(CURDIR)" "$(CURDIR)/vendor/bin/godeps" ./src/... > "$(CURDIR)/dependencies.tsv" ;\
rm -rf $$TMP
$(CURDIR)/scripts/ $@
fmt: hook
$(GO) fmt ./src/...
vet: dependencies common
GOPATH=$(GOPATH) $(GO) vet ./src/...
test: dependencies vet common
GOPATH=$(GOPATH) $(GO) test -v -timeout $(TIMEOUT) $(TESTARGS) ./src/...
cover: dependencies vet common
rm -f cover.out && \
GOPATH=$(GOPATH) $(GO) test -v -timeout $(TIMEOUT) -coverprofile cover.out ./src/signaling/... && \
sed -i "/_easyjson/d" cover.out && \
GOPATH=$(GOPATH) $(GO) tool cover -func=cover.out
coverhtml: dependencies vet common
rm -f cover.out && \
GOPATH=$(GOPATH) $(GO) test -v -timeout $(TIMEOUT) -coverprofile cover.out ./src/signaling/... && \
sed -i "/_easyjson/d" cover.out && \
GOPATH=$(GOPATH) $(GO) tool cover -html=cover.out -o coverage.html
%_easyjson.go: %.go
PATH=$(shell dirname $(GO)):$(PATH) GOPATH=$(GOPATH) ./vendor/bin/easyjson -all $*.go
common: \
src/signaling/api_signaling_easyjson.go \
src/signaling/api_backend_easyjson.go \
src/signaling/natsclient_easyjson.go \
client: dependencies common
mkdir -p $(BINDIR)
GOPATH=$(GOPATH) $(GO) build $(BUILDARGS) -ldflags '$(INTERNALLDFLAGS)' -o $(BINDIR)/client ./src/client/...
server: dependencies common
mkdir -p $(BINDIR)
GOPATH=$(GOPATH) $(GO) build $(BUILDARGS) -ldflags '$(INTERNALLDFLAGS)' -o $(BINDIR)/signaling ./src/server/...
rm -f src/signaling/*_easyjson.go
rm -f src/signaling/continentmap.go
build: server
git archive \
--prefix=nextcloud-spreed-signaling-$(TARVERSION)/ \
-o nextcloud-spreed-signaling-$(TARVERSION).tar.gz \
dist: tarball
.PHONY: src/signaling/continentmap.go

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# Spreed standalone signaling server
This repository contains the standalone signaling server which can be used for
Nextcloud Talk (
See for further
information on the API of the signaling server.
## Building
You will need at least go 1.6 to build the signaling server. All other
dependencies are fetched automatically while building.
$ make build
Afterwards the binary is created as `bin/signaling`.
## Configuration
A default configuration file is included as ``. Copy this to
`server.conf` and adjust as necessary for the local setup. See the file for
comments about the different parameters that can be changed.
## Running
The signaling server connects to a NATS server ( to distribute
messages between different instances. See the NATS documentation on how to set
up a server and run it.
Once the NATS server is running (and the URL to it is configured for the
signaling server), you can start the signaling server.
$ ./bin/signaling
By default, the configuration is loaded from `server.conf` in the current
directory, but a different path can be passed through the `--config` option.
$ ./bin/signaling --config /etc/signaling/server.conf
## Setup of NATS server
There is a detailed description on how to install and run the NATS server
available at
You can use the `gnatsd.conf` file as base for the configuration of the NATS
## Setup of Janus
A Janus server (from can be used to
act as a WebRTC gateway. See the documentation of Janus on how to configure and
run the server. At least the `VideoRoom` plugin and the websocket transport of
Janus must be enabled.
The signaling server uses the `VideoRoom` plugin of Janus to manage sessions.
All gateway details are hidden from the clients, all messages are sent through
the signaling server. Only WebRTC media is exchanged directly between the
gateway and the clients.
Edit the `server.conf` and enter the URL to the websocket endpoint of Janus in
the section `[mcu]` and key `url`. During startup, the signaling server will
connect to Janus and log information of the gateway.
The maximum bandwidth per publishing stream can also be configured in the
section `[mcu]`, see properties `maxstreambitrate` and `maxscreenbitrate`.
## Setup of frontend webserver
Usually the standalone signaling server is running behind a webserver that does
the SSL protocol or acts as a load balancer for multiple signaling servers.
The configuration examples below assume a pre-configured webserver (nginx or
Apache) with a working HTTPS setup, that is listening on the external interface
of the server hosting the standalone signaling server.
After everything has been set up, the configuration can be tested using `curl`:
$ curl -i https://myserver.domain.invalid/standalone-signaling/api/v1/welcome
HTTP/1.1 200 OK
Date: Thu, 05 Jul 2018 09:28:08 GMT
Server: nextcloud-spreed-signaling/1.0.0
Content-Type: application/json; charset=utf-8
Content-Length: 59
### nginx
Nginx can be used as frontend for the standalone signaling server without any
additional requirements.
The backend should be configured separately so it can be changed in a single
location and also to allow using multiple backends from a single frontend
Assuming the standalone signaling server is running on the local interface on
port `8080` below, add the following block to the nginx server definition in
`/etc/nginx/sites-enabled` (just before the `server` definition):
upstream signaling {
To proxy all requests for the standalone signaling to the correct backend, the
following `location` block must be added inside the `server` definition of
the same file:
location /standalone-signaling/ {
proxy_pass http://signaling/;
proxy_http_version 1.1;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
location /standalone-signaling/spreed {
proxy_pass http://signaling/spreed;
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "Upgrade";
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
Example (e.g. `/etc/nginx/sites-enabled/default`):
upstream signaling {
server {
listen 443 ssl http2;
server_name myserver.domain.invalid;
# ... other existing configuration ...
location /standalone-signaling/ {
proxy_pass http://signaling/;
proxy_http_version 1.1;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
location /standalone-signaling/spreed {
proxy_pass http://signaling/spreed;
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "Upgrade";
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
### Apache
To configure the Apache webservice as frontend for the standalone signaling
server, the modules `mod_proxy_http` and `mod_proxy_wstunnel` must be enabled
so WebSocket and API backend requests can be proxied:
$ sudo a2enmod proxy
$ sudo a2enmod proxy_http
$ sudo a2enmod proxy_wstunnel
Now the Apache `VirtualHost` configuration can be extended to forward requests
to the standalone signaling server (assuming the server is running on the local
interface on port `8080` below):
<VirtualHost *:443>
# ... existing configuration ...
# Enable proxying Websocket requests to the standalone signaling server.
ProxyPass "/standalone-signaling/" "ws://"
RewriteEngine On
# Websocket connections from the clients.
RewriteRule ^/standalone-signaling/spreed$ - [L]
# Backend connections from Nextcloud.
RewriteRule ^/standalone-signaling/api/(.*)$1 [L,P]
# ... existing configuration ...
## Setup of Nextcloud Talk
Login to your Nextcloud as admin and open the additional settings page. Scroll
down to the "Talk" section and enter the base URL of your standalone signaling
server in the field "External signaling server".
Please note that you have to use `https` if your Nextcloud is also running on
`https`. Usually you should enter `https://myhostname/standalone-signaling` as
The value "Shared secret for external signaling server" must be the same as the
property `secret` in section `backend` of your `server.conf`.
If you are using a self-signed certificate for development, you need to uncheck
the box `Validate SSL certificate` so backend requests from Nextcloud to the
signaling server can be performed.
## Benchmarking the server
A simple client exists to benchmark the server. Please note that the features
that are benchmarked might not cover the whole functionality, check the
implementation in `src/client` for details on the client.
To authenticate new client connections to the signaling server, the client
starts a dummy authentication handler on a local interface and passes the URL
in the `hello` request. Therefore the signaling server should be configured to
allow all backend hosts (option `allowall` in section `backend`).
The client is not compiled by default, but can be using the `client` target:
$ make client
$ ./bin/client
Usage of ./bin/client:
-addr string
http service address (default "localhost:28080")
-config string
config file to use (default "server.conf")
-maxClients int
number of client connections (default 100)
## Running multiple signaling servers
IMPORTANT: This is considered experimental and might not work with all
functionality of the signaling server, especially when using the Janus
The signaling server uses the NATS server to send messages to peers that are
not connected locally. Therefore multiple signaling servers running on different
hosts can use the same NATS server to build a simple cluster, allowing more
simultaneous connections and distribute the load.
To set this up, make sure all signaling servers are using the same settings for
their `session` keys and the `secret` in the `backend` section. Also the URL to
the NATS server (option `url` in section `nats`) must point to the same NATS
If all this is setup correctly, clients can connect to either of the signaling
servers and exchange messages between them.

dependencies.tsv Normal file
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@ -0,0 +1,12 @@ git dcc070983490608a14480e3bf943bad464785df5 2012-02-28T08:26:10Z git 08b5f424b9271eedf6f9f0ce86cb9396ed337a42 2016-08-17T18:46:32Z git ac112f7d75a0714af1bd86ab17749b31f7809640 2017-07-04T07:43:45Z git e59506cc896acb7f7bf732d4fdf5e25f7ccd8983 2017-02-24T19:38:04Z git ea4d1f681babbce9545c9c5f3d5194a789c89f5b 2017-06-20T19:01:03Z git 2f5df55504ebc322e4d52d34df6a1f5b503bf26d 2017-06-24T19:09:25Z git d4ca4c8b588d5da9c2ac82d6e445ce4feaba18ba 2017-06-01T15:47:09Z git 3cf34f9fca4e88afa9da8eabd75e3326c9941b44 2017-03-03T15:02:24Z git 8e6e2c423c03884d938d84442d37d6f6f5294197 2017-06-11T06:05:37Z git 1960b16a5147df3a4c61ac83b2f31cd8f811d609 2019-05-23T23:57:38Z git f01ecb60fe3835d80d9a0b7b2bf24b228c89260e 2017-07-11T18:12:19Z git ac767d655b305d4e9612f5f6e33120b9176c4ad4 2018-07-15T08:55:29Z
1 git dcc070983490608a14480e3bf943bad464785df5 2012-02-28T08:26:10Z
2 git 08b5f424b9271eedf6f9f0ce86cb9396ed337a42 2016-08-17T18:46:32Z
3 git ac112f7d75a0714af1bd86ab17749b31f7809640 2017-07-04T07:43:45Z
4 git e59506cc896acb7f7bf732d4fdf5e25f7ccd8983 2017-02-24T19:38:04Z
5 git ea4d1f681babbce9545c9c5f3d5194a789c89f5b 2017-06-20T19:01:03Z
6 git 2f5df55504ebc322e4d52d34df6a1f5b503bf26d 2017-06-24T19:09:25Z
7 git d4ca4c8b588d5da9c2ac82d6e445ce4feaba18ba 2017-06-01T15:47:09Z
8 git 3cf34f9fca4e88afa9da8eabd75e3326c9941b44 2017-03-03T15:02:24Z
9 git 8e6e2c423c03884d938d84442d37d6f6f5294197 2017-06-11T06:05:37Z
10 git 1960b16a5147df3a4c61ac83b2f31cd8f811d609 2019-05-23T23:57:38Z
11 git f01ecb60fe3835d80d9a0b7b2bf24b228c89260e 2017-07-11T18:12:19Z
12 git ac767d655b305d4e9612f5f6e33120b9176c4ad4 2018-07-15T08:55:29Z

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cluster {
port: 4244 # port for inbound route connections
routes = [
# You can add other servers here to build up a cluster.

scripts/ Executable file
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set -e
ROOT="$(cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd)"
if [ -s "$ROOT/../version.txt" ]; then
VERSION=$(cat "$ROOT/../version.txt" | tr -d '[:space:]')
if [ -z $VERSION ] && [ -d "$ROOT/../.git" ]; then
if [ "$1" == "--tar" ]; then
VERSION=$(git describe --dirty --tags --always | sed 's/debian\///g')
VERSION=$(git log -1 --pretty=%H)
if [ -z $VERSION ]; then

scripts/ Executable file
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# Standalone signaling server for the Nextcloud Spreed app.
# Copyright (C) 2019 struktur AG
# @author Joachim Bauch <>
# @license GNU AGPL version 3 or any later version
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# GNU Affero General Public License for more details.
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <>.
# Fallback for Python2
from cStringIO import StringIO
except ImportError:
from io import StringIO
import json
import subprocess
import sys
URL = ''
def tostr(s):
if isinstance(s, bytes) and not isinstance(s, str):
s = s.decode('utf-8')
return s
except NameError:
# Python 3 files are returning bytes by default.
def opentextfile(filename, mode):
if 'b' in mode:
mode = mode.replace('b', '')
return open(filename, mode, encoding='utf-8')
def opentextfile(filename, mode):
return open(filename, mode)
def generate_map(filename):
data = subprocess.check_output([
data = json.loads(tostr(data))
continents = {}
for entry in data:
country = entry['Two_Letter_Country_Code']
continent = entry['Continent_Code']
continents.setdefault(country, []).append(continent)
out = StringIO()
out.write('package signaling\n')
out.write('// This file has been automatically generated, do not modify.\n')
out.write('var (\n')
out.write('\tContinentMap map[string][]string = map[string][]string{\n')
for country, continents in sorted(continents.items()):
value = []
for continent in continents:
value.append('"%s"' % (continent))
out.write('\t\t"%s": []string{%s},\n' % (country, ', '.join(value)))
with opentextfile(filename, 'wb') as fp:
def main():
if len(sys.argv) != 2:
sys.stderr.write('USAGE: %s <filename>\n' % (sys.argv[0]))
filename = sys.argv[1]
if __name__ == '__main__':

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# Check that Go files have been formatted
for file in `git diff-index --cached --name-only HEAD --diff-filter=ACMR| grep "\.go$"` ; do
echo "Checking ${file} ..."
# nf is the temporary checkout. This makes sure we check against the
# revision in the index (and not the checked out version).
nf=`git checkout-index --temp "${file}" | cut -f 1`
newfile=`mktemp "/tmp/${nf}.XXXXXX"` || exit 1
gofmt ${nf} > "${newfile}" 2>> /dev/null
diff -u -p "${nf}" "${newfile}"
rm "${newfile}"
rm "${nf}"
if [ $r != 0 ] ; then
echo "================================================================================================="
echo " Code format error in: $file "
echo " "
echo " Please fix before committing. Don't forget to run git add before trying to commit again. "
echo " If the whole file is to be committed, this should work (run from the top-level directory): "
echo " "
echo " go fmt $file; git add $file; git commit"
echo " "
echo "================================================================================================="
exit 1

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# IP and port to listen on for HTTP requests.
# Comment line to disable the listener.
#listen =
# HTTP socket read timeout in seconds.
#readtimeout = 15
# HTTP socket write timeout in seconds.
#writetimeout = 15
# IP and port to listen on for HTTPS requests.
# Comment line to disable the listener.
#listen =
# HTTPS socket read timeout in seconds.
#readtimeout = 15
# HTTPS socket write timeout in seconds.
#writetimeout = 15
# Certificate / private key to use for the HTTPS server.
certificate = /etc/nginx/ssl/server.crt
key = /etc/nginx/ssl/server.key
# Set to "true" to install pprof debug handlers.
# See "" for further information.
debug = false
# Secret value used to generate checksums of sessions. This should be a random
# string of 32 or 64 bytes.
hashkey = the-secret-for-session-checksums
# Optional key for encrypting data in the sessions. Must be either 16, 24 or
# 32 bytes.
# If no key is specified, data will not be encrypted (not recommended).
blockkey = -encryption-key-
# Shared secret for connections from internal clients. This must be the same
# value as configured in the respective internal services.
internalsecret = the-shared-secret-for-internal-clients
# Comma-separated list of hostnames that are allowed to be used as backend
# endpoints.
allowed = nextcloud.domain.invalid
# Allow any hostname as backend endpoint. This is extremely insecure and should
# only be used while running the benchmark client against the server.
allowall = false
# Shared secret for requests from and to the backend servers. This must be the
# same value as configured in the Nextcloud admin ui.
secret = the-shared-secret
# Timeout in seconds for requests to the backend.
timeout = 10
# Maximum number of concurrent backend connections per host.
connectionsperhost = 8
# If set to "true", certificate validation of backend endpoints will be skipped.
# This should only be enabled during development, e.g. to work with self-signed
# certificates.
#skipverify = false
# Url of NATS backend to use. This can also be a list of URLs to connect to
# multiple backends. For local development, this can be set to ":loopback:"
# to process NATS messages internally instead of sending them through an
# external NATS backend.
#url = nats://localhost:4222
# The type of the MCU to use. Currently only "janus" is supported.
type = janus
# The URL to the websocket endpoint of the MCU server. Leave empty to disable
# MCU functionality.
url =
# The maximum bitrate per publishing stream (in bits per second).
# Defaults to 1 mbit/sec.
#maxstreambitrate = 1048576
# The maximum bitrate per screensharing stream (in bits per second).
# Default is 2 mbit/sec.
#maxscreenbitrate = 2097152
# API key that the MCU will need to send when requesting TURN credentials.
#apikey = the-api-key-for-the-rest-service
# The shared secret to use for generating TURN credentials. This must be the
# same as on the TURN server.
#secret = 6d1c17a7-c736-4e22-b02c-e2955b7ecc64
# A comma-separated list of TURN servers to use. Leave empty to disable the
#servers = turn:,turn:
# License key to use when downloading the MaxMind GeoIP database. You can
# register an account at "" for
# free. See """ for further
# information.
# Leave empty to disable GeoIP lookups.
#license =

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* Standalone signaling server for the Nextcloud Spreed app.
* Copyright (C) 2017 struktur AG
* @author Joachim Bauch <>
* @license GNU AGPL version 3 or any later version
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU Affero General Public License for more details.
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <>.
package main
import (
pseudorand "math/rand"
var (
addr = flag.String("addr", "localhost:28080", "http service address")
config = flag.String("config", "server.conf", "config file to use")
maxClients = flag.Int("maxClients", 100, "number of client connections")
backendSecret []byte
// Report messages that took more than 1 second.
messageReportDuration = 1000 * time.Millisecond
const (
// Time allowed to write a message to the peer.
writeWait = 10 * time.Second
// Time allowed to read the next pong message from the peer.
pongWait = 60 * time.Second
// Send pings to peer with this period. Must be less than pongWait.
pingPeriod = (pongWait * 9) / 10
// Maximum message size allowed from peer.
maxMessageSize = 64 * 1024
privateSessionName = "private-session"
publicSessionName = "public-session"
type Stats struct {
numRecvMessages uint64
numSentMessages uint64
resetRecvMessages uint64
resetSentMessages uint64
start time.Time
func (s *Stats) reset(start time.Time) {
s.resetRecvMessages = atomic.AddUint64(&s.numRecvMessages, 0)
s.resetSentMessages = atomic.AddUint64(&s.numSentMessages, 0)
s.start = start
func (s *Stats) Log() {
now := time.Now()
duration := now.Sub(s.start)
perSec := uint64(duration / time.Second)
if perSec == 0 {
totalSentMessages := atomic.AddUint64(&s.numSentMessages, 0)
sentMessages := totalSentMessages - s.resetSentMessages
totalRecvMessages := atomic.AddUint64(&s.numRecvMessages, 0)
recvMessages := totalRecvMessages - s.resetRecvMessages
log.Printf("Stats: sent=%d (%d/sec), recv=%d (%d/sec), delta=%d\n",
totalSentMessages, sentMessages/perSec,
totalRecvMessages, recvMessages/perSec,
type MessagePayload struct {
Now time.Time `json:"now"`
type SignalingClient struct {
ready_wg *sync.WaitGroup
cookie *securecookie.SecureCookie
conn *websocket.Conn
stats *Stats
closed uint32
stopChan chan bool
lock sync.Mutex
privateSessionId string
publicSessionId string
userId string
func NewSignalingClient(cookie *securecookie.SecureCookie, url string, stats *Stats, ready_wg *sync.WaitGroup, done_wg *sync.WaitGroup) (*SignalingClient, error) {
conn, _, err := websocket.DefaultDialer.Dial(url, nil)
if err != nil {
return nil, err
client := &SignalingClient{
ready_wg: ready_wg,
cookie: cookie,
conn: conn,
stats: stats,
stopChan: make(chan bool),
go func() {
defer done_wg.Done()
go func() {
defer done_wg.Done()
return client, nil
func (c *SignalingClient) Close() {
if !atomic.CompareAndSwapUint32(&c.closed, 0, 1) {
// Signal writepump to terminate
select {
case c.stopChan <- true:
c.publicSessionId = ""
c.privateSessionId = ""
c.conn.WriteMessage(websocket.CloseMessage, websocket.FormatCloseMessage(websocket.CloseNormalClosure, ""))
c.conn = nil
func (c *SignalingClient) Send(message *signaling.ClientMessage) {
if c.conn == nil {
if !c.writeInternal(message) {
func (c *SignalingClient) processMessage(message *signaling.ServerMessage) {
atomic.AddUint64(&c.stats.numRecvMessages, 1)
switch message.Type {
case "hello":
case "message":
case "bye":
log.Printf("Received bye: %+v\n", message.Bye)
log.Printf("Unsupported message type: %+v\n", *message)
func (c *SignalingClient) privateToPublicSessionId(privateId string) string {
var data signaling.SessionIdData
if err := c.cookie.Decode(privateSessionName, privateId, &data); err != nil {
panic(fmt.Sprintf("could not decode private session id: %s", err))
encoded, err := c.cookie.Encode(publicSessionName, data)
if err != nil {
panic(fmt.Sprintf("could not encode public id: %s", err))
reversed, err := reverseSessionId(encoded)
if err != nil {
panic(fmt.Sprintf("could not reverse session id: %s", err))
return reversed
func (c *SignalingClient) processHelloMessage(message *signaling.ServerMessage) {
defer c.lock.Unlock()
c.privateSessionId = message.Hello.ResumeId
c.publicSessionId = c.privateToPublicSessionId(c.privateSessionId)
c.userId = message.Hello.UserId
log.Printf("Registered as %s (userid %s)\n", c.privateSessionId, c.userId)
func (c *SignalingClient) PublicSessionId() string {
defer c.lock.Unlock()
return c.publicSessionId
func (c *SignalingClient) processMessageMessage(message *signaling.ServerMessage) {
var msg MessagePayload
if err := json.Unmarshal(*message.Message.Data, &msg); err != nil {
log.Println("Error in unmarshal", err)
now := time.Now()
duration := now.Sub(msg.Now)
if duration > messageReportDuration {
log.Printf("Message took %s\n", duration)
func (c *SignalingClient) readPump() {
conn := c.conn
defer func() {
conn.SetPongHandler(func(string) error {
return nil
var decodeBuffer bytes.Buffer
for {
messageType, reader, err := conn.NextReader()
if err != nil {
if websocket.IsUnexpectedCloseError(err,
websocket.CloseNoStatusReceived) {
log.Printf("Error: %v\n", err)
if messageType != websocket.TextMessage {
log.Println("Unsupported message type", messageType)
if _, err := decodeBuffer.ReadFrom(reader); err != nil {
if c.conn != nil {
log.Println("Error reading message", err)
var message signaling.ServerMessage
if err := message.UnmarshalJSON(decodeBuffer.Bytes()); err != nil {
log.Printf("Error: %v\n", err)
func (c *SignalingClient) writeInternal(message *signaling.ClientMessage) bool {
var closeData []byte
writer, err := c.conn.NextWriter(websocket.TextMessage)
if err == nil {
_, err = easyjson.MarshalToWriter(message, writer)
if err != nil {
if err == websocket.ErrCloseSent {
// Already sent a "close", won't be able to send anything else.
return false