func attemptGetHostState(h *host.Host, stateQueryChan chan<- HostListItem) {
url := ""
hostError := ""
dockerVersion := "Unknown"
currentState, err := h.Driver.GetState()
if err == nil {
url, err = h.URL()
}
if err == nil {
dockerVersion, err = h.DockerVersion()
if err != nil {
dockerVersion = "Unknown"
} else {
dockerVersion = fmt.Sprintf("v%s", dockerVersion)
}
}
if err != nil {
hostError = err.Error()
}
if hostError == drivers.ErrHostIsNotRunning.Error() {
hostError = ""
}
var swarmOptions *swarm.Options
var engineOptions *engine.Options
if h.HostOptions != nil {
swarmOptions = h.HostOptions.SwarmOptions
engineOptions = h.HostOptions.EngineOptions
}
stateQueryChan <- HostListItem{
Name: h.Name,
Active: isActive(currentState, url),
DriverName: h.Driver.DriverName(),
State: currentState,
URL: url,
SwarmOptions: swarmOptions,
EngineOptions: engineOptions,
DockerVersion: dockerVersion,
Error: hostError,
}
}
// PERFORMANCE: The code of this function is complicated because we try
// to call the underlying drivers as less as possible to get the information
// we need.
func attemptGetHostItem(h *host.Host, stateQueryChan chan<- commands.HostListItem) {
url := ""
currentState := state.None
dockerVersion := "Unknown"
hostError := ""
url, err := h.URL()
// PERFORMANCE: if we have the url, it's ok to assume the host is running
// This reduces the number of calls to the drivers
if err == nil {
if url != "" {
currentState = state.Running
} else {
currentState, err = h.Driver.GetState()
}
} else {
currentState, _ = h.Driver.GetState()
}
if err == nil && url != "" {
// PERFORMANCE: Reuse the url instead of asking the host again.
// This reduces the number of calls to the drivers
dockerHost := &mcndockerclient.RemoteDocker{
HostURL: url,
AuthOption: h.AuthOptions(),
}
dockerVersion, err = mcndockerclient.DockerVersion(dockerHost)
if err != nil {
dockerVersion = "Unknown"
} else {
dockerVersion = fmt.Sprintf("v%s", dockerVersion)
}
}
if err != nil {
hostError = err.Error()
}
if hostError == drivers.ErrHostIsNotRunning.Error() {
hostError = ""
}
var swarmOptions *swarm.Options
var engineOptions *engine.Options
if h.HostOptions != nil {
swarmOptions = h.HostOptions.SwarmOptions
engineOptions = h.HostOptions.EngineOptions
}
isMaster := false
swarmHost := ""
if swarmOptions != nil {
isMaster = swarmOptions.Master
swarmHost = swarmOptions.Host
}
activeHost := isActive(currentState, url)
activeSwarm := isSwarmActive(currentState, url, isMaster, swarmHost)
active := "-"
if activeHost {
active = "*"
}
if activeSwarm {
active = "* (swarm)"
}
stateQueryChan <- commands.HostListItem{
Name: h.Name,
Active: active,
ActiveHost: activeHost,
ActiveSwarm: activeSwarm,
DriverName: h.Driver.DriverName(),
State: currentState,
URL: url,
SwarmOptions: swarmOptions,
EngineOptions: engineOptions,
DockerVersion: dockerVersion,
Error: hostError,
}
}