Golang Logger.Tracef方法代碼示例

func prepareOrGetContainerInterfaceInfo(
	api APICalls,
	machineID string,
	bridgeDevice string,
	allocateOrMaintain bool,
	startingNetworkInfo []network.InterfaceInfo,
	log loggo.Logger,
) ([]network.InterfaceInfo, error) {
	maintain := !allocateOrMaintain

	if maintain {
		log.Debugf("not running maintenance for machine %q", machineID)
		return nil, nil
	}

	log.Debugf("using multi-bridge networking for container %q", machineID)

	containerTag := names.NewMachineTag(machineID)
	preparedInfo, err := api.PrepareContainerInterfaceInfo(containerTag)
	if err != nil {
		return nil, errors.Trace(err)
	}
	log.Tracef("PrepareContainerInterfaceInfo returned %+v", preparedInfo)

	return preparedInfo, nil
}

func logAllSeverities(logger loggo.Logger) {
	logger.Criticalf("something critical")
	logger.Errorf("an error")
	logger.Warningf("a warning message")
	logger.Infof("an info message")
	logger.Debugf("a debug message")
	logger.Tracef("a trace message")
}

// tracingRespondDecorator returns an autorest.RespondDecorator that
// logs responses at trace level.
func tracingRespondDecorator(logger loggo.Logger) autorest.RespondDecorator {
	return func(r autorest.Responder) autorest.Responder {
		return autorest.ResponderFunc(func(resp *http.Response) error {
			dump, err := httputil.DumpResponse(resp, true)
			if err != nil {
				logger.Tracef("failed to dump response: %v", err)
				logger.Tracef("%+v", resp)
			} else {
				logger.Tracef("%s", dump)
			}
			return r.Respond(resp)
		})
	}
}

// tracingPrepareDecorator returns an autorest.PrepareDecorator that
// logs requests at trace level.
func tracingPrepareDecorator(logger loggo.Logger) autorest.PrepareDecorator {
	return func(p autorest.Preparer) autorest.Preparer {
		return autorest.PreparerFunc(func(r *http.Request) (*http.Request, error) {
			dump, err := httputil.DumpRequest(r, true)
			if err != nil {
				logger.Tracef("failed to dump request: %v", err)
				logger.Tracef("%+v", r)
			} else {
				logger.Tracef("%s", dump)
			}
			return p.Prepare(r)
		})
	}
}

// Sends the specified request to URL and checks that the HTTP response status is as expected.
// reqReader: a reader returning the data to send.
// length: the number of bytes to send.
// headers: HTTP headers to include with the request.
// expectedStatus: a slice of allowed response status codes.
func (c *Client) sendRequest(method, URL string, reqReader io.Reader, length int, headers http.Header,
	expectedStatus []int, logger *loggo.Logger) (rc io.ReadCloser, respHeader *http.Header, err error) {
	reqData := make([]byte, length)
	if reqReader != nil {
		nrRead, err := io.ReadFull(reqReader, reqData)
		if err != nil {
			err = errors.Newf(err, "failed reading the request data, read %v of %v bytes", nrRead, length)
			return rc, respHeader, err
		}
	}
	rawResp, err := c.sendRateLimitedRequest(method, URL, headers, reqData, logger)
	if err != nil {
		return
	}

	if logger != nil && logger.IsTraceEnabled() {
		logger.Tracef("Request: %s %s\n", method, URL)
		logger.Tracef("Request header: %s\n", headers)
		logger.Tracef("Request body: %s\n", reqData)
		logger.Tracef("Response: %s\n", rawResp.Status)
		logger.Tracef("Response header: %s\n", rawResp.Header)
		logger.Tracef("Response body: %s\n", rawResp.Body)
		logger.Tracef("Response error: %s\n", err)
	}

	foundStatus := false
	if len(expectedStatus) == 0 {
		expectedStatus = []int{http.StatusOK}
	}
	for _, status := range expectedStatus {
		if rawResp.StatusCode == status {
			foundStatus = true
			break
		}
	}
	if !foundStatus && len(expectedStatus) > 0 {
		err = handleError(URL, rawResp)
		rawResp.Body.Close()
		return
	}
	return rawResp.Body, &rawResp.Header, err
}

func prepareOrGetContainerInterfaceInfo(
	api APICalls,
	machineID string,
	bridgeDevice string,
	allocateOrMaintain bool,
	enableNAT bool,
	startingNetworkInfo []network.InterfaceInfo,
	log loggo.Logger,
	providerType string,
) ([]network.InterfaceInfo, error) {
	maintain := !allocateOrMaintain

	if environs.AddressAllocationEnabled(providerType) {
		if maintain {
			log.Debugf("running maintenance for container %q", machineID)
		} else {
			log.Debugf("trying to allocate static IP for container %q", machineID)
		}

		allocatedInfo, err := configureContainerNetwork(
			machineID,
			bridgeDevice,
			api,
			startingNetworkInfo,
			allocateOrMaintain,
			enableNAT,
		)
		if err != nil && !maintain {
			log.Infof("not allocating static IP for container %q: %v", machineID, err)
		}
		return allocatedInfo, err
	}

	if maintain {
		log.Debugf("address allocation disabled: Not running maintenance for machine %q", machineID)
		return nil, nil
	}

	log.Debugf("address allocation feature flag not enabled; using multi-bridge networking for container %q", machineID)

	// In case we're running on MAAS 1.8+ with devices support, we'll still
	// call PrepareContainerInterfaceInfo(), but we'll ignore a NotSupported
	// error if we get it (which means we're not using MAAS 1.8+).
	containerTag := names.NewMachineTag(machineID)
	preparedInfo, err := api.PrepareContainerInterfaceInfo(containerTag)
	if err != nil && errors.IsNotSupported(err) {
		log.Warningf("new container %q not registered as device: not running on MAAS 1.8+", machineID)
		return nil, nil
	} else if err != nil {
		return nil, errors.Trace(err)
	}
	log.Tracef("PrepareContainerInterfaceInfo returned %+v", preparedInfo)

	dnsServersFound := false
	for _, info := range preparedInfo {
		if len(info.DNSServers) > 0 {
			dnsServersFound = true
			break
		}
	}
	if !dnsServersFound {
		logger.Warningf("no DNS settings found, discovering the host settings")
		dnsServers, searchDomain, err := localDNSServers()
		if err != nil {
			return nil, errors.Trace(err)
		}

		// Since the result is sorted, the first entry is the primary NIC.
		preparedInfo[0].DNSServers = dnsServers
		preparedInfo[0].DNSSearchDomains = []string{searchDomain}
		logger.Debugf(
			"setting DNS servers %+v and domains %+v on container interface %q",
			preparedInfo[0].DNSServers, preparedInfo[0].DNSSearchDomains, preparedInfo[0].InterfaceName,
		)
	}

	return preparedInfo, nil
}

func prepareOrGetContainerInterfaceInfo(
	api APICalls,
	machineID string,
	bridgeDevice string,
	allocateOrMaintain bool,
	enableNAT bool,
	startingNetworkInfo []network.InterfaceInfo,
	log loggo.Logger,
) ([]network.InterfaceInfo, error) {
	maintain := !allocateOrMaintain

	if environs.AddressAllocationEnabled() {
		if maintain {
			log.Debugf("running maintenance for container %q", machineID)
		} else {
			log.Debugf("trying to allocate static IP for container %q", machineID)
		}

		allocatedInfo, err := configureContainerNetwork(
			machineID,
			bridgeDevice,
			api,
			startingNetworkInfo,
			allocateOrMaintain,
			enableNAT,
		)
		if err != nil && !maintain {
			log.Infof("not allocating static IP for container %q: %v", machineID, err)
		}
		return allocatedInfo, err
	}

	if maintain {
		log.Debugf("address allocation disabled: Not running maintenance for machine %q", machineID)
		return nil, nil
	}

	log.Debugf("address allocation feature flag not enabled; using DHCP for container %q", machineID)

	// In case we're running on MAAS 1.8+ with devices support, we'll still
	// call PrepareContainerInterfaceInfo(), but we'll ignore a NotSupported
	// error if we get it (which means we're not using MAAS 1.8+).
	containerTag := names.NewMachineTag(machineID)
	preparedInfo, err := api.PrepareContainerInterfaceInfo(containerTag)
	if err != nil && errors.IsNotSupported(err) {
		log.Warningf("new container %q not registered as device: not running on MAAS 1.8+", machineID)
		return nil, nil
	} else if err != nil {
		return nil, errors.Trace(err)
	}

	dnsServers, searchDomain, dnsErr := localDNSServers()

	if dnsErr != nil {
		return nil, errors.Trace(dnsErr)
	}

	for i, _ := range preparedInfo {
		preparedInfo[i].DNSServers = dnsServers
		preparedInfo[i].DNSSearch = searchDomain
	}

	log.Tracef("PrepareContainerInterfaceInfo returned %#v", preparedInfo)
	// Most likely there will be only one item in the list, but check
	// all of them for forward compatibility.
	macAddresses := set.NewStrings()
	for _, prepInfo := range preparedInfo {
		macAddresses.Add(prepInfo.MACAddress)
	}
	log.Infof(
		"new container %q registered as a MAAS device with MAC address(es) %v",
		machineID, macAddresses.SortedValues(),
	)
	return preparedInfo, nil
}