mirror of https://github.com/prometheus/prometheus
137 lines
3.8 KiB
Go
137 lines
3.8 KiB
Go
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package zk
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import (
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"fmt"
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"io"
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"os"
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"os/exec"
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"path/filepath"
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)
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type ErrMissingServerConfigField string
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func (e ErrMissingServerConfigField) Error() string {
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return fmt.Sprintf("zk: missing server config field '%s'", string(e))
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}
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const (
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DefaultServerTickTime = 2000
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DefaultServerInitLimit = 10
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DefaultServerSyncLimit = 5
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DefaultServerAutoPurgeSnapRetainCount = 3
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DefaultPeerPort = 2888
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DefaultLeaderElectionPort = 3888
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)
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type ServerConfigServer struct {
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ID int
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Host string
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PeerPort int
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LeaderElectionPort int
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}
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type ServerConfig struct {
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TickTime int // Number of milliseconds of each tick
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InitLimit int // Number of ticks that the initial synchronization phase can take
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SyncLimit int // Number of ticks that can pass between sending a request and getting an acknowledgement
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DataDir string // Direcrory where the snapshot is stored
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ClientPort int // Port at which clients will connect
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AutoPurgeSnapRetainCount int // Number of snapshots to retain in dataDir
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AutoPurgePurgeInterval int // Purge task internal in hours (0 to disable auto purge)
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Servers []ServerConfigServer
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}
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func (sc ServerConfig) Marshall(w io.Writer) error {
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if sc.DataDir == "" {
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return ErrMissingServerConfigField("dataDir")
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}
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fmt.Fprintf(w, "dataDir=%s\n", sc.DataDir)
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if sc.TickTime <= 0 {
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sc.TickTime = DefaultServerTickTime
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}
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fmt.Fprintf(w, "tickTime=%d\n", sc.TickTime)
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if sc.InitLimit <= 0 {
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sc.InitLimit = DefaultServerInitLimit
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}
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fmt.Fprintf(w, "initLimit=%d\n", sc.InitLimit)
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if sc.SyncLimit <= 0 {
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sc.SyncLimit = DefaultServerSyncLimit
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}
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fmt.Fprintf(w, "syncLimit=%d\n", sc.SyncLimit)
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if sc.ClientPort <= 0 {
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sc.ClientPort = DefaultPort
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}
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fmt.Fprintf(w, "clientPort=%d\n", sc.ClientPort)
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if sc.AutoPurgePurgeInterval > 0 {
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if sc.AutoPurgeSnapRetainCount <= 0 {
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sc.AutoPurgeSnapRetainCount = DefaultServerAutoPurgeSnapRetainCount
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}
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fmt.Fprintf(w, "autopurge.snapRetainCount=%d\n", sc.AutoPurgeSnapRetainCount)
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fmt.Fprintf(w, "autopurge.purgeInterval=%d\n", sc.AutoPurgePurgeInterval)
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}
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if len(sc.Servers) > 0 {
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for _, srv := range sc.Servers {
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if srv.PeerPort <= 0 {
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srv.PeerPort = DefaultPeerPort
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}
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if srv.LeaderElectionPort <= 0 {
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srv.LeaderElectionPort = DefaultLeaderElectionPort
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}
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fmt.Fprintf(w, "server.%d=%s:%d:%d\n", srv.ID, srv.Host, srv.PeerPort, srv.LeaderElectionPort)
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}
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}
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return nil
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}
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var jarSearchPaths = []string{
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"zookeeper-*/contrib/fatjar/zookeeper-*-fatjar.jar",
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"../zookeeper-*/contrib/fatjar/zookeeper-*-fatjar.jar",
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"/usr/share/java/zookeeper-*.jar",
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"/usr/local/zookeeper-*/contrib/fatjar/zookeeper-*-fatjar.jar",
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"/usr/local/Cellar/zookeeper/*/libexec/contrib/fatjar/zookeeper-*-fatjar.jar",
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}
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func findZookeeperFatJar() string {
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var paths []string
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zkPath := os.Getenv("ZOOKEEPER_PATH")
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if zkPath == "" {
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paths = jarSearchPaths
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} else {
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paths = []string{filepath.Join(zkPath, "contrib/fatjar/zookeeper-*-fatjar.jar")}
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}
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for _, path := range paths {
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matches, _ := filepath.Glob(path)
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// TODO: could sort by version and pick latest
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if len(matches) > 0 {
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return matches[0]
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}
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}
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return ""
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}
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type Server struct {
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JarPath string
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ConfigPath string
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Stdout, Stderr io.Writer
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cmd *exec.Cmd
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}
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func (srv *Server) Start() error {
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if srv.JarPath == "" {
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srv.JarPath = findZookeeperFatJar()
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if srv.JarPath == "" {
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return fmt.Errorf("zk: unable to find server jar")
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}
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}
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srv.cmd = exec.Command("java", "-jar", srv.JarPath, "server", srv.ConfigPath)
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srv.cmd.Stdout = srv.Stdout
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srv.cmd.Stderr = srv.Stderr
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return srv.cmd.Start()
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}
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func (srv *Server) Stop() error {
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srv.cmd.Process.Signal(os.Kill)
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return srv.cmd.Wait()
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}
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