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| 1 | +package main |
| 2 | + |
| 3 | +import ( |
| 4 | + "bufio" |
| 5 | + "bytes" |
| 6 | + "net" |
| 7 | + "os" |
| 8 | + "os/exec" |
| 9 | + "os/signal" |
| 10 | + "syscall" |
| 11 | + "time" |
| 12 | + |
| 13 | + "github.com/ActiveState/tail" |
| 14 | + "github.com/Sirupsen/logrus" |
| 15 | + "github.com/coreos/go-etcd/etcd" |
| 16 | +) |
| 17 | + |
| 18 | +var log = logrus.New() |
| 19 | + |
| 20 | +const ( |
| 21 | + timeout time.Duration = 10 * time.Second |
| 22 | + ttl time.Duration = timeout * 2 |
| 23 | + gitLogFile string = "/opt/nginx/logs/git.log" |
| 24 | + nginxAccessLog string = "/opt/nginx/logs/access.log" |
| 25 | + nginxErrorLog string = "/opt/nginx/logs/error.log" |
| 26 | +) |
| 27 | + |
| 28 | +func main() { |
| 29 | + logLevel := getopt("LOG", "info") |
| 30 | + if level, err := logrus.ParseLevel(logLevel); err == nil { |
| 31 | + log.Level = level |
| 32 | + } |
| 33 | + |
| 34 | + log.Debug("reading environment variables...") |
| 35 | + host := getopt("HOST", "127.0.0.1") |
| 36 | + |
| 37 | + etcdPort := getopt("ETCD_PORT", "4001") |
| 38 | + |
| 39 | + etcdPath := getopt("ETCD_PATH", "/deis/router") |
| 40 | + |
| 41 | + hostEtcdPath := getopt("HOST_ETCD_PATH", "/deis/router/hosts/"+host) |
| 42 | + |
| 43 | + externalPort := getopt("EXTERNAL_PORT", "80") |
| 44 | + |
| 45 | + client := etcd.NewClient([]string{"http://" + host + ":" + etcdPort}) |
| 46 | + |
| 47 | + // wait until etcd has discarded potentially stale values |
| 48 | + time.Sleep(timeout + 1) |
| 49 | + |
| 50 | + log.Debug("creating required defaults in etcd...") |
| 51 | + mkdirEtcd(client, "/deis/controller") |
| 52 | + mkdirEtcd(client, "/deis/services") |
| 53 | + mkdirEtcd(client, "/deis/domains") |
| 54 | + mkdirEtcd(client, "/deis/builder") |
| 55 | + mkdirEtcd(client, "/deis/router/hosts") |
| 56 | + |
| 57 | + setDefaultEtcd(client, etcdPath+"/gzip", "on") |
| 58 | + |
| 59 | + log.Info("Starting Nginx...") |
| 60 | + // tail the logs |
| 61 | + go tailFile(nginxAccessLog) |
| 62 | + go tailFile(nginxErrorLog) |
| 63 | + go tailFile(gitLogFile) |
| 64 | + |
| 65 | + nginxChan := make(chan bool) |
| 66 | + go launchNginx(nginxChan) |
| 67 | + <-nginxChan |
| 68 | + |
| 69 | + waitForInitialConfd(host+":"+etcdPort, timeout) |
| 70 | + |
| 71 | + go launchConfd(host + ":" + etcdPort) |
| 72 | + |
| 73 | + go publishService(client, hostEtcdPath, host, externalPort, uint64(ttl.Seconds())) |
| 74 | + |
| 75 | + log.Info("deis-router running...") |
| 76 | + |
| 77 | + exitChan := make(chan os.Signal, 2) |
| 78 | + signal.Notify(exitChan, syscall.SIGTERM, syscall.SIGINT) |
| 79 | + go cleanOnExit(exitChan) |
| 80 | + <-exitChan |
| 81 | +} |
| 82 | + |
| 83 | +func cleanOnExit(exitChan chan os.Signal) { |
| 84 | + for _ = range exitChan { |
| 85 | + tail.Cleanup() |
| 86 | + } |
| 87 | +} |
| 88 | + |
| 89 | +// Wait until the compilation of the templates |
| 90 | +func waitForInitialConfd(etcd string, timeout time.Duration) { |
| 91 | + for { |
| 92 | + var buffer bytes.Buffer |
| 93 | + output := bufio.NewWriter(&buffer) |
| 94 | + log.Debugf("Connecting to etcd server %s", etcd) |
| 95 | + cmd := exec.Command("confd", "-onetime", "-node", etcd, "-config-file", "/app/confd.toml", "-debug", "-verbose") |
| 96 | + cmd.Stdout = output |
| 97 | + cmd.Stderr = output |
| 98 | + |
| 99 | + err := cmd.Run() |
| 100 | + output.Flush() |
| 101 | + if err == nil { |
| 102 | + break |
| 103 | + } |
| 104 | + |
| 105 | + log.Info("waiting for confd to write initial templates...") |
| 106 | + log.Debugf("\n%s", buffer.String()) |
| 107 | + time.Sleep(timeout) |
| 108 | + } |
| 109 | +} |
| 110 | + |
| 111 | +func launchConfd(etcd string) { |
| 112 | + cmd := exec.Command("confd", "-node", etcd, "-config-file", "/app/confd.toml") |
| 113 | + cmd.Stdout = os.Stdout |
| 114 | + cmd.Stderr = os.Stderr |
| 115 | + |
| 116 | + if err := cmd.Start(); err != nil { |
| 117 | + log.Warn("confd terminated by error: %v", err) |
| 118 | + } |
| 119 | +} |
| 120 | + |
| 121 | +func launchNginx(nginxChan chan bool) { |
| 122 | + cmd := exec.Command("/opt/nginx/sbin/nginx", "-c", "/opt/nginx/conf/nginx.conf") |
| 123 | + cmd.Stdout = os.Stdout |
| 124 | + cmd.Stderr = os.Stderr |
| 125 | + |
| 126 | + if err := cmd.Start(); err != nil { |
| 127 | + log.Warn("Nginx terminated by error: %v", err) |
| 128 | + } |
| 129 | + |
| 130 | + // Wait until the nginx is available |
| 131 | + for { |
| 132 | + _, err := net.DialTimeout("tcp", "127.0.0.1:80", timeout) |
| 133 | + if err == nil { |
| 134 | + nginxChan <- true |
| 135 | + break |
| 136 | + } |
| 137 | + } |
| 138 | + |
| 139 | + if err := cmd.Wait(); err != nil { |
| 140 | + log.Warnf("Nginx terminated by error: %v", err) |
| 141 | + } else { |
| 142 | + log.Info("Reloading nginx (change in configuration)...") |
| 143 | + } |
| 144 | +} |
| 145 | + |
| 146 | +func tailFile(path string) { |
| 147 | + mkfifo(path) |
| 148 | + t, _ := tail.TailFile(path, tail.Config{Follow: true}) |
| 149 | + |
| 150 | + for line := range t.Lines { |
| 151 | + log.Info(line.Text) |
| 152 | + } |
| 153 | +} |
| 154 | + |
| 155 | +func mkfifo(path string) { |
| 156 | + os.Remove(path) |
| 157 | + if err := syscall.Mkfifo(path, syscall.S_IFIFO|0666); err != nil { |
| 158 | + log.Fatalf("%v", err) |
| 159 | + } |
| 160 | +} |
| 161 | + |
| 162 | +func publishService( |
| 163 | + client *etcd.Client, |
| 164 | + etcdPath string, |
| 165 | + host string, |
| 166 | + externalPort string, |
| 167 | + ttl uint64) { |
| 168 | + |
| 169 | + for { |
| 170 | + setEtcd(client, etcdPath, host+":"+externalPort, ttl) |
| 171 | + time.Sleep(timeout) |
| 172 | + } |
| 173 | +} |
| 174 | + |
| 175 | +func setEtcd(client *etcd.Client, key, value string, ttl uint64) { |
| 176 | + _, err := client.Set(key, value, ttl) |
| 177 | + if err != nil { |
| 178 | + log.Warn(err) |
| 179 | + } |
| 180 | +} |
| 181 | + |
| 182 | +func setDefaultEtcd(client *etcd.Client, key, value string) { |
| 183 | + _, err := client.Set(key, value, 0) |
| 184 | + if err != nil { |
| 185 | + log.Warn(err) |
| 186 | + } |
| 187 | +} |
| 188 | + |
| 189 | +func mkdirEtcd(client *etcd.Client, path string) { |
| 190 | + _, err := client.CreateDir(path, 0) |
| 191 | + if err != nil { |
| 192 | + log.Warn(err) |
| 193 | + } |
| 194 | +} |
| 195 | + |
| 196 | +func getopt(name, dfault string) string { |
| 197 | + value := os.Getenv(name) |
| 198 | + if value == "" { |
| 199 | + value = dfault |
| 200 | + } |
| 201 | + return value |
| 202 | +} |
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