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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,113 +1,113 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| dockerapi "github.com/fsouza/go-dockerclient" | ||
| "log" | ||
| "os" | ||
| "strings" | ||
| "sync" | ||
| dockerapi "github.com/fsouza/go-dockerclient" | ||
| "log" | ||
| "os" | ||
| "strings" | ||
| "sync" | ||
| ) | ||
|
|
||
| type HostEntry struct { | ||
| IPAddress string | ||
| CanonicalHostname string | ||
| Aliases []string | ||
| IPAddress string | ||
| CanonicalHostname string | ||
| Aliases []string | ||
| } | ||
|
|
||
| type Hosts struct { | ||
| sync.Mutex | ||
| docker *dockerapi.Client | ||
| path string | ||
| domain string | ||
| entries map[string]HostEntry | ||
| sync.Mutex | ||
| docker *dockerapi.Client | ||
| path string | ||
| domain string | ||
| entries map[string]HostEntry | ||
| } | ||
|
|
||
| func NewHosts(docker *dockerapi.Client, path, domain string) *Hosts { | ||
| hosts := &Hosts{ | ||
| docker: docker, | ||
| path: path, | ||
| domain: domain, | ||
| } | ||
|
|
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| hosts.entries = make(map[string]HostEntry) | ||
|
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| // combination of docker, centos | ||
| hosts.entries["__localhost4"] = HostEntry{ | ||
| IPAddress: "127.0.0.1", | ||
| CanonicalHostname: "localhost", | ||
| Aliases: []string{"localhost4"}, | ||
| } | ||
|
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||
| hosts.entries["__localhost6"] = HostEntry{ | ||
| IPAddress: "::1", | ||
| CanonicalHostname: "localhost", | ||
| Aliases: []string{"localhost6", "ip6-localhost", "ip6-loopback"}, | ||
| } | ||
|
|
||
| // docker puts these in | ||
| hosts.entries["fe00::0"] = HostEntry{"fe00::0", "ip6-localnet", nil} | ||
| hosts.entries["ff00::0"] = HostEntry{"ff00::0", "ip6-mcastprefix", nil} | ||
| hosts.entries["ff02::1"] = HostEntry{"ff02::1", "ip6-allnodes", nil} | ||
| hosts.entries["ff02::2"] = HostEntry{"ff02::2", "ip6-allrouters", nil} | ||
|
|
||
| return hosts | ||
| hosts := &Hosts{ | ||
| docker: docker, | ||
| path: path, | ||
| domain: domain, | ||
| } | ||
|
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| hosts.entries = make(map[string]HostEntry) | ||
|
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||
| // combination of docker, centos | ||
| hosts.entries["__localhost4"] = HostEntry{ | ||
| IPAddress: "127.0.0.1", | ||
| CanonicalHostname: "localhost", | ||
| Aliases: []string{"localhost4"}, | ||
| } | ||
|
|
||
| hosts.entries["__localhost6"] = HostEntry{ | ||
| IPAddress: "::1", | ||
| CanonicalHostname: "localhost", | ||
| Aliases: []string{"localhost6", "ip6-localhost", "ip6-loopback"}, | ||
| } | ||
|
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||
| // docker puts these in | ||
| hosts.entries["fe00::0"] = HostEntry{"fe00::0", "ip6-localnet", nil} | ||
| hosts.entries["ff00::0"] = HostEntry{"ff00::0", "ip6-mcastprefix", nil} | ||
| hosts.entries["ff02::1"] = HostEntry{"ff02::1", "ip6-allnodes", nil} | ||
| hosts.entries["ff02::2"] = HostEntry{"ff02::2", "ip6-allrouters", nil} | ||
|
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| return hosts | ||
| } | ||
|
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| func (h *Hosts) WriteFile() { | ||
| file, err := os.Create(h.path) | ||
|
|
||
| if err != nil { | ||
| log.Println("unable to write to", h.path, err) | ||
| return | ||
| } | ||
|
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||
| defer file.Close() | ||
|
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||
| for _, entry := range h.entries { | ||
| // <ip>\t<canonical>\t<alias1>\t…\t<aliasN>\n | ||
| file.WriteString(strings.Join( | ||
| append( | ||
| []string{entry.IPAddress, entry.CanonicalHostname}, | ||
| entry.Aliases..., | ||
| ), | ||
| "\t", | ||
| ) + "\n") | ||
| } | ||
| file, err := os.Create(h.path) | ||
|
|
||
| if err != nil { | ||
| log.Println("unable to write to", h.path, err) | ||
| return | ||
| } | ||
|
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||
| defer file.Close() | ||
|
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| for _, entry := range h.entries { | ||
| // <ip>\t<canonical>\t<alias1>\t…\t<aliasN>\n | ||
| file.WriteString(strings.Join( | ||
| append( | ||
| []string{entry.IPAddress, entry.CanonicalHostname}, | ||
| entry.Aliases..., | ||
| ), | ||
| "\t", | ||
| ) + "\n") | ||
| } | ||
| } | ||
|
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||
| func (h *Hosts) Add(containerId string) { | ||
| h.Lock() | ||
| defer h.Unlock() | ||
|
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||
| container, err := h.docker.InspectContainer(containerId) | ||
| if err != nil { | ||
| log.Println("unable to inspect container:", containerId, err) | ||
| return | ||
| } | ||
|
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||
| entry := HostEntry{ | ||
| IPAddress: container.NetworkSettings.IPAddress, | ||
| CanonicalHostname: container.Config.Hostname, | ||
| Aliases: []string{ | ||
| // container.Name[1:], // could contain "_" | ||
| }, | ||
| } | ||
|
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| if h.domain != "" { | ||
| entry.Aliases = | ||
| append(h.entries[containerId].Aliases, container.Config.Hostname+"."+h.domain) | ||
| } | ||
|
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| h.entries[containerId] = entry | ||
|
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| h.WriteFile() | ||
| h.Lock() | ||
| defer h.Unlock() | ||
|
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||
| container, err := h.docker.InspectContainer(containerId) | ||
| if err != nil { | ||
| log.Println("unable to inspect container:", containerId, err) | ||
| return | ||
| } | ||
|
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||
| entry := HostEntry{ | ||
| IPAddress: container.NetworkSettings.IPAddress, | ||
| CanonicalHostname: container.Config.Hostname, | ||
| Aliases: []string{ | ||
| // container.Name[1:], // could contain "_" | ||
| }, | ||
| } | ||
|
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||
| if h.domain != "" { | ||
| entry.Aliases = | ||
| append(h.entries[containerId].Aliases, container.Config.Hostname+"."+h.domain) | ||
| } | ||
|
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| h.entries[containerId] = entry | ||
|
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| h.WriteFile() | ||
| } | ||
|
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| func (h *Hosts) Remove(containerId string) { | ||
| h.Lock() | ||
| defer h.Unlock() | ||
| h.Lock() | ||
| defer h.Unlock() | ||
|
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| delete(h.entries, containerId) | ||
| delete(h.entries, containerId) | ||
|
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||
| h.WriteFile() | ||
| h.WriteFile() | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,61 +1,61 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "flag" | ||
| dockerapi "github.com/fsouza/go-dockerclient" | ||
| "log" | ||
| "os" | ||
| "flag" | ||
| dockerapi "github.com/fsouza/go-dockerclient" | ||
| "log" | ||
| "os" | ||
| ) | ||
|
|
||
| func getopt(name, def string) string { | ||
| if env := os.Getenv(name); env != "" { | ||
| return env | ||
| } | ||
| return def | ||
| if env := os.Getenv(name); env != "" { | ||
| return env | ||
| } | ||
| return def | ||
| } | ||
|
|
||
| func assert(err error) { | ||
| if err != nil { | ||
| log.Fatal("docker-hosts: ", err) | ||
| } | ||
| if err != nil { | ||
| log.Fatal("docker-hosts: ", err) | ||
| } | ||
| } | ||
|
|
||
| func main() { | ||
| domainName := flag.String("domain-name", "", "domain name to append") | ||
| flag.Parse() | ||
| domainName := flag.String("domain-name", "", "domain name to append") | ||
| flag.Parse() | ||
|
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||
| hostsFile := flag.Arg(0) | ||
| if hostsFile == "" { | ||
| log.Fatal("no hosts file provided") | ||
| } | ||
| hostsFile := flag.Arg(0) | ||
| if hostsFile == "" { | ||
| log.Fatal("no hosts file provided") | ||
| } | ||
|
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| docker, err := dockerapi.NewClient(getopt("DOCKER_HOST", "unix:///var/run/docker.sock")) | ||
| assert(err) | ||
| docker, err := dockerapi.NewClient(getopt("DOCKER_HOST", "unix:///var/run/docker.sock")) | ||
| assert(err) | ||
|
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| hosts := NewHosts(docker, hostsFile, *domainName) | ||
| hosts := NewHosts(docker, hostsFile, *domainName) | ||
|
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| // set up to handle events early, so we don't miss anything while doing the | ||
| // initial population | ||
| events := make(chan *dockerapi.APIEvents) | ||
| assert(docker.AddEventListener(events)) | ||
| // set up to handle events early, so we don't miss anything while doing the | ||
| // initial population | ||
| events := make(chan *dockerapi.APIEvents) | ||
| assert(docker.AddEventListener(events)) | ||
|
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| containers, err := docker.ListContainers(dockerapi.ListContainersOptions{}) | ||
| assert(err) | ||
| containers, err := docker.ListContainers(dockerapi.ListContainersOptions{}) | ||
| assert(err) | ||
|
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| for _, listing := range containers { | ||
| go hosts.Add(listing.ID) | ||
| } | ||
| for _, listing := range containers { | ||
| go hosts.Add(listing.ID) | ||
| } | ||
|
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| log.Println("docker-hosts: Listening for Docker events...") | ||
| for msg := range events { | ||
| switch msg.Status { | ||
| case "start": | ||
| go hosts.Add(msg.ID) | ||
| log.Println("docker-hosts: Listening for Docker events...") | ||
| for msg := range events { | ||
| switch msg.Status { | ||
| case "start": | ||
| go hosts.Add(msg.ID) | ||
|
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| case "die": | ||
| go hosts.Remove(msg.ID) | ||
| } | ||
| } | ||
| case "die": | ||
| go hosts.Remove(msg.ID) | ||
| } | ||
| } | ||
|
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||
| log.Fatal("docker-hosts: docker event loop closed") // todo: reconnect? | ||
| log.Fatal("docker-hosts: docker event loop closed") // todo: reconnect? | ||
| } |