func()

in internal/sqlservermetrics/guestoscollector/linuxcollector.go [436:527]

• 86 lines of code
• 17 McCabe index (conditional complexity)

func (c *LinuxCollector) CollectGuestRules(ctx context.Context, timeout time.Duration) sqlserverutils.MetricDetails {
	details := sqlserverutils.MetricDetails{
		Name: "OS",
	}
	fields := map[string]string{}

	if !c.remote {
		ctxWithTimeout, cancel := context.WithTimeout(ctx, timeout)
		defer cancel()
		ch := make(chan bool, 1)
		go func() {
			DiskToDiskType(fields, c.disks)
			ch <- true
		}()
		select {
		case <-ctxWithTimeout.Done():
			log.Logger.Errorf("DiskToDiskType() for local linux disktype timeout")
		case <-ch:
		}

	} else {
		if c.remoteRunner == nil {
			fields[UseLocalSSD] = "unknown"
			details.Fields = append(details.Fields, fields)
			log.Logger.Debugw("Remoterunner is nil. Remote collection attempted when ssh keys aren't set up correctly. Check customer support documentation.")
			return details
		}
		defer func() {
			log.Logger.Debug("Closing the remote runner client")
			if err := c.remoteRunner.Close(); err != nil {
				log.Logger.Errorw("Failed to close the client in remote runner", "error", err)
			}
		}()
	}

	for _, rule := range CollectionOSFields() {
		exe := c.guestRuleCommandMap[rule]
		func() {
			ctxWithTimeout, cancel := context.WithTimeout(ctx, timeout)
			defer cancel()
			ch := make(chan bool, 1)
			go func() {
				if c.remote {
					res, err := exe.runRemoteCommand(ctx, exe.command, c.remoteRunner)
					if err != nil {
						if strings.Contains(err.Error(), "Check help docs") {
							log.Logger.Warnw("Failed to run remote command. Install command on linux vm to collect more data", "command", exe.command, "error", err)
						} else {
							log.Logger.Errorw("Failed to run remote command", "command", exe.command, "error", err)
						}
						fields[rule] = "unknown"
						ch <- false
						return
					} else if res == "null" {
						fields[rule] = "unknown"
						ch <- false
						return
					}
					fields[rule] = res
				} else if exe.isRule { // local calls are only made if isrule is true
					res, err := exe.runCommand(ctx, exe.command)
					if err != nil {
						if strings.Contains(err.Error(), "Check help docs") {
							log.Logger.Warnw("Failed to run remote command. Install command on linux vm to collect more data", "command", exe.command, "error", err)
						} else {
							log.Logger.Errorw("Failed to run command", "command", exe.command, "error", err)
						}
						fields[rule] = "unknown"
						ch <- false
						return
					} else if res == "null" {
						fields[rule] = "unknown"
						ch <- false
						return
					}
					fields[rule] = res
				}
				ch <- true
			}()

			select {
			case <-ctxWithTimeout.Done():
				log.Logger.Errorf("Running linux guest rule %s timeout", rule)
			case <-ch:
			}

		}()

	}
	details.Fields = append(details.Fields, fields)
	return details
}