Commit 5ca552fa authored by Nikita Chernyi's avatar Nikita Chernyi

Merge branch 'websocket' into 'master'

Added websocket support

See merge request !2
parents e7d9aee1 138efb84
Pipeline #67917739 passed with stage
in 1 minute and 38 seconds
config.json
# This file is autogenerated, do not edit; changes may be undone by the next 'dep ensure'.
[[projects]]
branch = "master"
digest = "1:7427036b6d926b3d1fa0773771820735b35554a98296f1074df440ee30a97296"
name = "golang.org/x/net"
packages = ["websocket"]
pruneopts = "UT"
revision = "3b0461eec859c4b73bb64fdc8285971fd33e3938"
[solve-meta]
analyzer-name = "dep"
analyzer-version = 1
input-imports = ["golang.org/x/net/websocket"]
solver-name = "gps-cdcl"
solver-version = 1
# Gopkg.toml example
#
# Refer to https://golang.github.io/dep/docs/Gopkg.toml.html
# for detailed Gopkg.toml documentation.
#
# required = ["github.com/user/thing/cmd/thing"]
# ignored = ["github.com/user/project/pkgX", "bitbucket.org/user/project/pkgA/pkgY"]
#
# [[constraint]]
# name = "github.com/user/project"
# version = "1.0.0"
#
# [[constraint]]
# name = "github.com/user/project2"
# branch = "dev"
# source = "github.com/myfork/project2"
#
# [[override]]
# name = "github.com/x/y"
# version = "2.4.0"
#
# [prune]
# non-go = false
# go-tests = true
# unused-packages = true
[[constraint]]
branch = "master"
name = "golang.org/x/net"
[prune]
go-tests = true
unused-packages = true
![](assets/title.png)
This program will constantly check for one or more http(-s) endpoints and notify you
This program will constantly check for one or more http(-s) or websocket endpoints and notify you
whenever something goes down and also when it goes up again!
It will additionally expose an api with the current statuses of every endpoint
configured.
......@@ -19,6 +19,10 @@ This health check needs a `config.json` file with this minimal structure
{
"name": "Google",
"url": "https://www.google.com"
},
{
"name": "WebSocket Echo",
"url": "wss://echo.websocket.org"
}
]
}
......
......@@ -2,8 +2,11 @@ package main
import (
"fmt"
"golang.org/x/net/websocket"
"log"
"net/http"
"net/url"
"strings"
"time"
"gitlab.com/rakshazi/healthcheck/config"
......@@ -96,11 +99,19 @@ func (c *Checker) checkAll() {
}
func fetchMonitorURL(client *http.Client, URLMonitor *URLMonitor) (int, error) {
resp, err := client.Get(URLMonitor.URL)
if strings.HasPrefix(URLMonitor.URL, "ws://") || strings.HasPrefix(URLMonitor.URL, "wss://") {
origin, _ := url.Parse(URLMonitor.URL)
ws, err := websocket.Dial(URLMonitor.URL, "", origin.Scheme+"://"+origin.Host)
defer ws.Close()
if err != nil {
return 0, fmt.Errorf("cannot fetch monitor %s: %v", URLMonitor.Name, err)
}
return 200, nil
}
resp, err := client.Get(URLMonitor.URL)
if err != nil {
return 0, fmt.Errorf("cannot fetch monitor %s: %v", URLMonitor.Name, err)
}
return resp.StatusCode, nil
}
{
"server": {
"port": 8080,
"endpoint": "/"
},
"checker": {
"interval": 30,
"timeout": 2
},
"urlMonitors": [
{
"name": "Google",
"url": "https://www.google.com"
}
],
"slack": {
"enabled": false,
"webhookUrl": "<your slack webhook url here>",
"messages": {
"healthy": "{{.Name}} is up!",
"unhealthy": "{{.Name}} is down!"
}
},
"twilio": {
"sms": {
"enabled": false,
"accountSid": "<your twilio accound sid>",
"authToken": "<your twilio auth token>",
"from": "<a twilio active number>",
"to": [
"<your full phone number>"
],
"body": {
"healthy": "{{.Name}} is up!",
"unhealthy": "{{.Name}} is down!"
},
"timeout": 2
}
}
"server": {
"port": 8080,
"endpoint": "/"
},
"checker": {
"interval": 30,
"timeout": 2
},
"urlMonitors": [
{
"name": "Google",
"url": "https://www.google.com"
}
],
"slack": {
"enabled": false,
"webhookUrl": "<your slack webhook url here>",
"messages": {
"healthy": "{{.Name}} is up!",
"unhealthy": "{{.Name}} is down!"
}
},
"twilio": {
"sms": {
"enabled": false,
"accountSid": "<your twilio accound sid>",
"authToken": "<your twilio auth token>",
"from": "<a twilio active number>",
"to": [
"<your full phone number>"
],
"body": {
"healthy": "{{.Name}} is up!",
"unhealthy": "{{.Name}} is down!"
},
"timeout": 2
}
}
}
# This source code refers to The Go Authors for copyright purposes.
# The master list of authors is in the main Go distribution,
# visible at http://tip.golang.org/AUTHORS.
# This source code was written by the Go contributors.
# The master list of contributors is in the main Go distribution,
# visible at http://tip.golang.org/CONTRIBUTORS.
Copyright (c) 2009 The Go Authors. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
* Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Additional IP Rights Grant (Patents)
"This implementation" means the copyrightable works distributed by
Google as part of the Go project.
Google hereby grants to You a perpetual, worldwide, non-exclusive,
no-charge, royalty-free, irrevocable (except as stated in this section)
patent license to make, have made, use, offer to sell, sell, import,
transfer and otherwise run, modify and propagate the contents of this
implementation of Go, where such license applies only to those patent
claims, both currently owned or controlled by Google and acquired in
the future, licensable by Google that are necessarily infringed by this
implementation of Go. This grant does not include claims that would be
infringed only as a consequence of further modification of this
implementation. If you or your agent or exclusive licensee institute or
order or agree to the institution of patent litigation against any
entity (including a cross-claim or counterclaim in a lawsuit) alleging
that this implementation of Go or any code incorporated within this
implementation of Go constitutes direct or contributory patent
infringement, or inducement of patent infringement, then any patent
rights granted to you under this License for this implementation of Go
shall terminate as of the date such litigation is filed.
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package websocket
import (
"bufio"
"io"
"net"
"net/http"
"net/url"
)
// DialError is an error that occurs while dialling a websocket server.
type DialError struct {
*Config
Err error
}
func (e *DialError) Error() string {
return "websocket.Dial " + e.Config.Location.String() + ": " + e.Err.Error()
}
// NewConfig creates a new WebSocket config for client connection.
func NewConfig(server, origin string) (config *Config, err error) {
config = new(Config)
config.Version = ProtocolVersionHybi13
config.Location, err = url.ParseRequestURI(server)
if err != nil {
return
}
config.Origin, err = url.ParseRequestURI(origin)
if err != nil {
return
}
config.Header = http.Header(make(map[string][]string))
return
}
// NewClient creates a new WebSocket client connection over rwc.
func NewClient(config *Config, rwc io.ReadWriteCloser) (ws *Conn, err error) {
br := bufio.NewReader(rwc)
bw := bufio.NewWriter(rwc)
err = hybiClientHandshake(config, br, bw)
if err != nil {
return
}
buf := bufio.NewReadWriter(br, bw)
ws = newHybiClientConn(config, buf, rwc)
return
}
// Dial opens a new client connection to a WebSocket.
func Dial(url_, protocol, origin string) (ws *Conn, err error) {
config, err := NewConfig(url_, origin)
if err != nil {
return nil, err
}
if protocol != "" {
config.Protocol = []string{protocol}
}
return DialConfig(config)
}
var portMap = map[string]string{
"ws": "80",
"wss": "443",
}
func parseAuthority(location *url.URL) string {
if _, ok := portMap[location.Scheme]; ok {
if _, _, err := net.SplitHostPort(location.Host); err != nil {
return net.JoinHostPort(location.Host, portMap[location.Scheme])
}
}
return location.Host
}
// DialConfig opens a new client connection to a WebSocket with a config.
func DialConfig(config *Config) (ws *Conn, err error) {
var client net.Conn
if config.Location == nil {
return nil, &DialError{config, ErrBadWebSocketLocation}
}
if config.Origin == nil {
return nil, &DialError{config, ErrBadWebSocketOrigin}
}
dialer := config.Dialer
if dialer == nil {
dialer = &net.Dialer{}
}
client, err = dialWithDialer(dialer, config)
if err != nil {
goto Error
}
ws, err = NewClient(config, client)
if err != nil {
client.Close()
goto Error
}
return
Error:
return nil, &DialError{config, err}
}
// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package websocket
import (
"crypto/tls"
"net"
)
func dialWithDialer(dialer *net.Dialer, config *Config) (conn net.Conn, err error) {
switch config.Location.Scheme {
case "ws":
conn, err = dialer.Dial("tcp", parseAuthority(config.Location))
case "wss":
conn, err = tls.DialWithDialer(dialer, "tcp", parseAuthority(config.Location), config.TlsConfig)
default:
err = ErrBadScheme
}
return
}
This diff is collapsed.
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package websocket
import (
"bufio"
"fmt"
"io"
"net/http"
)
func newServerConn(rwc io.ReadWriteCloser, buf *bufio.ReadWriter, req *http.Request, config *Config, handshake func(*Config, *http.Request) error) (conn *Conn, err error) {
var hs serverHandshaker = &hybiServerHandshaker{Config: config}
code, err := hs.ReadHandshake(buf.Reader, req)
if err == ErrBadWebSocketVersion {
fmt.Fprintf(buf, "HTTP/1.1 %03d %s\r\n", code, http.StatusText(code))
fmt.Fprintf(buf, "Sec-WebSocket-Version: %s\r\n", SupportedProtocolVersion)
buf.WriteString("\r\n")
buf.WriteString(err.Error())
buf.Flush()
return
}
if err != nil {
fmt.Fprintf(buf, "HTTP/1.1 %03d %s\r\n", code, http.StatusText(code))
buf.WriteString("\r\n")
buf.WriteString(err.Error())
buf.Flush()
return
}
if handshake != nil {
err = handshake(config, req)
if err != nil {
code = http.StatusForbidden
fmt.Fprintf(buf, "HTTP/1.1 %03d %s\r\n", code, http.StatusText(code))
buf.WriteString("\r\n")
buf.Flush()
return
}
}
err = hs.AcceptHandshake(buf.Writer)
if err != nil {
code = http.StatusBadRequest
fmt.Fprintf(buf, "HTTP/1.1 %03d %s\r\n", code, http.StatusText(code))
buf.WriteString("\r\n")
buf.Flush()
return
}
conn = hs.NewServerConn(buf, rwc, req)
return
}
// Server represents a server of a WebSocket.
type Server struct {
// Config is a WebSocket configuration for new WebSocket connection.
Config
// Handshake is an optional function in WebSocket handshake.
// For example, you can check, or don't check Origin header.
// Another example, you can select config.Protocol.
Handshake func(*Config, *http.Request) error
// Handler handles a WebSocket connection.
Handler
}
// ServeHTTP implements the http.Handler interface for a WebSocket
func (s Server) ServeHTTP(w http.ResponseWriter, req *http.Request) {
s.serveWebSocket(w, req)
}
func (s Server) serveWebSocket(w http.ResponseWriter, req *http.Request) {
rwc, buf, err := w.(http.Hijacker).Hijack()
if err != nil {
panic("Hijack failed: " + err.Error())
}
// The server should abort the WebSocket connection if it finds
// the client did not send a handshake that matches with protocol
// specification.
defer rwc.Close()
conn, err := newServerConn(rwc, buf, req, &s.Config, s.Handshake)
if err != nil {
return
}
if conn == nil {
panic("unexpected nil conn")
}
s.Handler(conn)
}
// Handler is a simple interface to a WebSocket browser client.
// It checks if Origin header is valid URL by default.
// You might want to verify websocket.Conn.Config().Origin in the func.
// If you use Server instead of Handler, you could call websocket.Origin and
// check the origin in your Handshake func. So, if you want to accept
// non-browser clients, which do not send an Origin header, set a
// Server.Handshake that does not check the origin.
type Handler func(*Conn)
func checkOrigin(config *Config, req *http.Request) (err error) {
config.Origin, err = Origin(config, req)
if err == nil && config.Origin == nil {
return fmt.Errorf("null origin")
}
return err
}
// ServeHTTP implements the http.Handler interface for a WebSocket
func (h Handler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
s := Server{Handler: h, Handshake: checkOrigin}
s.serveWebSocket(w, req)
}
This diff is collapsed.
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