|
| 1 | +package main |
| 2 | + |
| 3 | +import ( |
| 4 | + "bufio" |
| 5 | + "io" |
| 6 | + "log" |
| 7 | + "strings" |
| 8 | + "sync" |
| 9 | + |
| 10 | + "github.com/fsouza/go-dockerclient" |
| 11 | +) |
| 12 | + |
| 13 | +type AttachManager struct { |
| 14 | + sync.Mutex |
| 15 | + attached map[string]*LogPump |
| 16 | + channels map[chan *AttachEvent]struct{} |
| 17 | + client *docker.Client |
| 18 | +} |
| 19 | + |
| 20 | +func NewAttachManager(client *docker.Client) *AttachManager { |
| 21 | + m := &AttachManager{ |
| 22 | + attached: make(map[string]*LogPump), |
| 23 | + channels: make(map[chan *AttachEvent]struct{}), |
| 24 | + client: client, |
| 25 | + } |
| 26 | + containers, err := client.ListContainers(docker.ListContainersOptions{}) |
| 27 | + assert(err, "attacher") |
| 28 | + for _, listing := range containers { |
| 29 | + m.attach(listing.ID[:12]) |
| 30 | + } |
| 31 | + go func() { |
| 32 | + events := make(chan *docker.APIEvents) |
| 33 | + assert(client.AddEventListener(events), "attacher") |
| 34 | + for msg := range events { |
| 35 | + debug("event:", msg.ID[:12], msg.Status) |
| 36 | + if msg.Status == "create" { |
| 37 | + go m.attach(msg.ID[:12]) |
| 38 | + } |
| 39 | + } |
| 40 | + log.Fatal("ruh roh") // todo: loop? |
| 41 | + }() |
| 42 | + return m |
| 43 | +} |
| 44 | + |
| 45 | +func (m *AttachManager) attach(id string) { |
| 46 | + container, err := m.client.InspectContainer(id) |
| 47 | + assert(err, "attacher") |
| 48 | + name := container.Name[1:] |
| 49 | + success := make(chan struct{}) |
| 50 | + failure := make(chan error) |
| 51 | + outrd, outwr := io.Pipe() |
| 52 | + errrd, errwr := io.Pipe() |
| 53 | + go func() { |
| 54 | + err := m.client.AttachToContainer(docker.AttachToContainerOptions{ |
| 55 | + Container: id, |
| 56 | + OutputStream: outwr, |
| 57 | + ErrorStream: errwr, |
| 58 | + Stdin: false, |
| 59 | + Stdout: true, |
| 60 | + Stderr: true, |
| 61 | + Stream: true, |
| 62 | + Success: success, |
| 63 | + }) |
| 64 | + outwr.Close() |
| 65 | + errwr.Close() |
| 66 | + debug("attach:", id, "finished") |
| 67 | + if err != nil { |
| 68 | + close(success) |
| 69 | + failure <- err |
| 70 | + } |
| 71 | + m.send(&AttachEvent{Type: "detach", ID: id, Name: name}) |
| 72 | + m.Lock() |
| 73 | + delete(m.attached, id) |
| 74 | + m.Unlock() |
| 75 | + }() |
| 76 | + _, ok := <-success |
| 77 | + if ok { |
| 78 | + m.Lock() |
| 79 | + m.attached[id] = NewLogPump(outrd, errrd, id, name) |
| 80 | + m.Unlock() |
| 81 | + success <- struct{}{} |
| 82 | + m.send(&AttachEvent{ID: id, Name: name, Type: "attach"}) |
| 83 | + debug("attach:", id, "success") |
| 84 | + return |
| 85 | + } |
| 86 | + debug("attach:", id, "failure:", <-failure) |
| 87 | +} |
| 88 | + |
| 89 | +func (m *AttachManager) send(event *AttachEvent) { |
| 90 | + m.Lock() |
| 91 | + defer m.Unlock() |
| 92 | + for ch, _ := range m.channels { |
| 93 | + // TODO: log err after timeout and continue |
| 94 | + ch <- event |
| 95 | + } |
| 96 | +} |
| 97 | + |
| 98 | +func (m *AttachManager) addListener(ch chan *AttachEvent) { |
| 99 | + m.Lock() |
| 100 | + defer m.Unlock() |
| 101 | + m.channels[ch] = struct{}{} |
| 102 | + go func() { |
| 103 | + for id, pump := range m.attached { |
| 104 | + ch <- &AttachEvent{ID: id, Name: pump.Name, Type: "attach"} |
| 105 | + } |
| 106 | + }() |
| 107 | +} |
| 108 | + |
| 109 | +func (m *AttachManager) removeListener(ch chan *AttachEvent) { |
| 110 | + m.Lock() |
| 111 | + defer m.Unlock() |
| 112 | + delete(m.channels, ch) |
| 113 | +} |
| 114 | + |
| 115 | +func (m *AttachManager) Get(id string) *LogPump { |
| 116 | + m.Lock() |
| 117 | + defer m.Unlock() |
| 118 | + return m.attached[id] |
| 119 | +} |
| 120 | + |
| 121 | +func (m *AttachManager) Listen(source *Source, logstream chan *Log, closer <-chan bool) { |
| 122 | + if source == nil { |
| 123 | + source = new(Source) |
| 124 | + } |
| 125 | + events := make(chan *AttachEvent) |
| 126 | + m.addListener(events) |
| 127 | + defer m.removeListener(events) |
| 128 | + for { |
| 129 | + select { |
| 130 | + case event := <-events: |
| 131 | + if event.Type == "attach" && (source.All() || |
| 132 | + (source.ID != "" && strings.HasPrefix(event.ID, source.ID)) || |
| 133 | + (source.Name != "" && event.Name == source.Name) || |
| 134 | + (source.Filter != "" && strings.Contains(event.Name, source.Filter))) { |
| 135 | + pump := m.Get(event.ID) |
| 136 | + pump.AddListener(logstream) |
| 137 | + defer func() { |
| 138 | + if pump != nil { |
| 139 | + pump.RemoveListener(logstream) |
| 140 | + } |
| 141 | + }() |
| 142 | + } else if source.ID != "" && event.Type == "detach" && |
| 143 | + strings.HasPrefix(event.ID, source.ID) { |
| 144 | + return |
| 145 | + } |
| 146 | + case <-closer: |
| 147 | + return |
| 148 | + } |
| 149 | + } |
| 150 | +} |
| 151 | + |
| 152 | +type LogPump struct { |
| 153 | + sync.Mutex |
| 154 | + ID string |
| 155 | + Name string |
| 156 | + channels map[chan *Log]struct{} |
| 157 | +} |
| 158 | + |
| 159 | +func NewLogPump(stdout, stderr io.Reader, id, name string) *LogPump { |
| 160 | + obj := &LogPump{ |
| 161 | + ID: id, |
| 162 | + Name: name, |
| 163 | + channels: make(map[chan *Log]struct{}), |
| 164 | + } |
| 165 | + pump := func(typ string, source io.Reader) { |
| 166 | + buf := bufio.NewReader(source) |
| 167 | + for { |
| 168 | + data, err := buf.ReadBytes('\n') |
| 169 | + if err != nil { |
| 170 | + if err != io.EOF { |
| 171 | + debug("pump:", id, typ+":", err) |
| 172 | + } |
| 173 | + return |
| 174 | + } |
| 175 | + obj.send(&Log{ |
| 176 | + Data: strings.TrimSuffix(string(data), "\n"), |
| 177 | + ID: id, |
| 178 | + Name: name, |
| 179 | + Type: typ, |
| 180 | + }) |
| 181 | + } |
| 182 | + } |
| 183 | + go pump("stdout", stdout) |
| 184 | + go pump("stderr", stderr) |
| 185 | + return obj |
| 186 | +} |
| 187 | + |
| 188 | +func (o *LogPump) send(log *Log) { |
| 189 | + o.Lock() |
| 190 | + defer o.Unlock() |
| 191 | + for ch, _ := range o.channels { |
| 192 | + // TODO: log err after timeout and continue |
| 193 | + ch <- log |
| 194 | + } |
| 195 | +} |
| 196 | + |
| 197 | +func (o *LogPump) AddListener(ch chan *Log) { |
| 198 | + o.Lock() |
| 199 | + defer o.Unlock() |
| 200 | + o.channels[ch] = struct{}{} |
| 201 | +} |
| 202 | + |
| 203 | +func (o *LogPump) RemoveListener(ch chan *Log) { |
| 204 | + o.Lock() |
| 205 | + defer o.Unlock() |
| 206 | + delete(o.channels, ch) |
| 207 | +} |
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