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logs_command.go
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logs_command.go
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package v7
import (
"context"
"fmt"
"os"
"os/signal"
"time"
"code.cloudfoundry.org/cli/actor/sharedaction"
"code.cloudfoundry.org/cli/actor/v7action"
"code.cloudfoundry.org/cli/api/cloudcontroller/ccv3"
"code.cloudfoundry.org/cli/command"
"code.cloudfoundry.org/cli/command/flag"
"code.cloudfoundry.org/cli/command/v7/shared"
"code.cloudfoundry.org/clock"
)
//go:generate counterfeiter . LogsActor
type LogsActor interface {
GetRecentLogsForApplicationByNameAndSpace(appName string, spaceGUID string, client sharedaction.LogCacheClient) ([]sharedaction.LogMessage, v7action.Warnings, error)
GetStreamingLogsForApplicationByNameAndSpace(appName string, spaceGUID string, client sharedaction.LogCacheClient) (<-chan sharedaction.LogMessage, <-chan error, context.CancelFunc, v7action.Warnings, error)
ScheduleTokenRefresh(func(time.Duration) <-chan time.Time, chan struct{}, chan struct{}) (<-chan error, error)
}
type LogsCommand struct {
RequiredArgs flag.AppName `positional-args:"yes"`
Recent bool `long:"recent" description:"Dump recent logs instead of tailing"`
usage interface{} `usage:"CF_NAME logs APP_NAME"`
relatedCommands interface{} `related_commands:"app, apps, ssh"`
UI command.UI
Config command.Config
CC_Client *ccv3.Client
SharedActor command.SharedActor
Actor LogsActor
LogCacheClient sharedaction.LogCacheClient
}
func (cmd *LogsCommand) Setup(config command.Config, ui command.UI) error {
cmd.UI = ui
cmd.Config = config
cmd.SharedActor = sharedaction.NewActor(config)
ccClient, uaaClient, err := shared.GetNewClientsAndConnectToCF(config, ui, "")
if err != nil {
return err
}
cmd.CC_Client = ccClient
cmd.Actor = v7action.NewActor(ccClient, config, nil, uaaClient, clock.NewClock())
cmd.LogCacheClient = command.NewLogCacheClient(ccClient.Info.LogCache(), config, ui)
return nil
}
func (cmd LogsCommand) Execute(args []string) error {
err := cmd.SharedActor.CheckTarget(true, true)
if err != nil {
return err
}
user, err := cmd.Config.CurrentUser()
if err != nil {
return err
}
cmd.UI.DisplayTextWithFlavor("Retrieving logs for app {{.AppName}} in org {{.OrgName}} / space {{.SpaceName}} as {{.Username}}...",
map[string]interface{}{
"AppName": cmd.RequiredArgs.AppName,
"OrgName": cmd.Config.TargetedOrganization().Name,
"SpaceName": cmd.Config.TargetedSpace().Name,
"Username": user.Name,
})
cmd.UI.DisplayNewline()
if cmd.Recent {
return cmd.displayRecentLogs()
}
stop := make(chan struct{})
stoppedRefreshing := make(chan struct{})
stoppedOutputtingRefreshErrors := make(chan struct{})
err = cmd.refreshTokenPeriodically(stop, stoppedRefreshing, stoppedOutputtingRefreshErrors)
if err != nil {
return err
}
err = cmd.streamLogs()
close(stop)
<-stoppedRefreshing
<-stoppedOutputtingRefreshErrors
return err
}
func (cmd LogsCommand) displayRecentLogs() error {
messages, warnings, err := cmd.Actor.GetRecentLogsForApplicationByNameAndSpace(
cmd.RequiredArgs.AppName,
cmd.Config.TargetedSpace().GUID,
cmd.LogCacheClient,
)
for _, message := range messages {
cmd.UI.DisplayLogMessage(message, true)
}
cmd.UI.DisplayWarnings(warnings)
return err
}
func (cmd LogsCommand) refreshTokenPeriodically(
stop chan struct{},
stoppedRefreshing chan struct{},
stoppedOutputtingRefreshErrors chan struct{}) error {
tokenRefreshErrors, err := cmd.Actor.ScheduleTokenRefresh(time.After, stop, stoppedRefreshing)
if err != nil {
return err
}
go func() {
defer close(stoppedOutputtingRefreshErrors)
for {
select {
case err := <-tokenRefreshErrors:
cmd.UI.DisplayError(err)
case <-stop:
return
}
}
}()
return nil
}
func (cmd LogsCommand) streamLogs() error {
messages, logErrs, stopStreaming, warnings, err := cmd.Actor.GetStreamingLogsForApplicationByNameAndSpace(
cmd.RequiredArgs.AppName,
cmd.Config.TargetedSpace().GUID,
cmd.LogCacheClient,
)
cmd.UI.DisplayWarnings(warnings)
if err != nil {
return err
}
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt)
var messagesClosed, errLogsClosed bool
for {
select {
case message, ok := <-messages:
if !ok {
messagesClosed = true
break
}
cmd.UI.DisplayLogMessage(message, true)
case logErr, ok := <-logErrs:
if !ok {
errLogsClosed = true
break
}
stopStreaming()
return fmt.Errorf("Failed to retrieve logs from Log Cache: %s", logErr)
case <-c:
stopStreaming()
return nil
}
if messagesClosed && errLogsClosed {
break
}
}
return nil
}