Golang log.Error函數代碼示例

// Resolve dependencies in a dependency list
// Resolves dependencies in order they occured originally
func (d *DependencyList) Resolve() error {
	if d == nil {
		log.Debug("No dependencies to resolve")
		return nil
	}

	log.Debug("Resolving dependencies")

	errs := make([]string, 0)

	for _, dep := range d.Dependencies {
		log.Debug("Resolving module dependency: %s", dep)
		if err := dep.Resolve(d.Parent); err != nil {
			log.Error("Error resolving module dependencies [%s]: %s", dep, err)
			errs = append(errs, dep.String())
			break
		}
	}

	if len(errs) > 0 {
		log.Error("Failed to find dependencies:")
		for _, err := range errs {
			log.Error("=> %s", err)
		}
		return errors.New("Failed to find dependencies")
	}

	return nil
}

func ParseCPANLines(lines []string) (*CPANFile, error) {
	cpanfile := &CPANFile{}

	for _, l := range lines {
		if len(l) == 0 {
			continue
		}

		log.Trace("Parsing line: %s", l)
		dep, err := ParseCPANLine(l)

		if err != nil {
			log.Error("=> Error parsing line: %s", err)
			continue
		}

		if dep != nil {
			log.Info("=> Found dependency: %s", dep)
			cpanfile.AddDependency(dep)
			continue
		}

		log.Trace("=> No error and no dependency found")
	}

	log.Info("Found %d dependencies in cpanfile", len(cpanfile.Dependencies))

	return cpanfile, nil
}

func SaveIndex(index string, indexes map[string]*Source) {
	// TODO append, but needs to know which stuff is new
	//out, err := os.OpenFile(".gopancache/index", os.O_RDWR|os.O_APPEND, 0660)
	out, err := os.Create(index)
	if err != nil {
		log.Error("Error creating index: %s", err.Error())
	}
	for _, source := range indexes {
		out.Write([]byte(source.Name + " [" + source.URL + "]\n"))
		log.Trace(source.Name)
		for _, author := range source.Authors {
			out.Write([]byte(" " + author.Name + " [" + author.URL + "]\n"))
			log.Trace("    %s", author.Name)
			for _, pkg := range author.Packages {
				out.Write([]byte("  " + pkg.Name + " => " + pkg.URL + "\n"))
				log.Trace("        %s => %s", pkg.Name, pkg.URL)
				for p, pk := range pkg.Provides {
					out.Write([]byte("   " + p + " (" + pk.Version + "): " + pk.File + "\n"))
					log.Trace("          %s (%s): %s", p, pk.Version, pk.File)
				}
			}
		}
	}
	out.Close()
}

func WatchConfig(configWrapper iConfigWrapper, configPath string) {
	watcherForConfigFile, err := fsnotify.NewWatcher()
	CheckError(err)

	go func() {
		for {
			select {
			case e := <-watcherForConfigFile.Event:
				if lastConfigModifiedTime.Add(1 * time.Second).After(time.Now()) {
					continue
				}
				lastConfigModifiedTime = time.Now()

				// log.Warn("Config '%s' modified, but NOT RELOADING YET.", e.Name)
				log.Warn("Config '%s' modified, now reloading (most of the) config settings.", e.Name)
				configWrapper.SetConfig(loadFile(configPath))
				configWrapper.ConfigReloaded()
				break
			case err := <-watcherForConfigFile.Error:
				log.Error("Error: %+v", err)
				break
			}
		}
	}()

	err = watcherForConfigFile.Watch(configPath)
	CheckError(err)
}

// NetworkName returns the SSID of the wifi network.
func NetworkName(nif string) string {
	if nif == "" {
		nif = C.GoString(C.guessWifiInterfaceName())
	}

	if nif == "" {
		log.Debug("Could not find Wi-Fi network interface")
		return ""
	}

	active := C.getWifiActive(C.CString(nif))
	powerOn := C.getWifiPowerOn(C.CString(nif))

	if !active {
		log.Debug("Wi-Fi network interface is not active")
		return ""
	}

	if !powerOn {
		log.Debug("Wi-Fi network interface is not powered on")
		return ""
	}

	ssid := C.GoString(C.getWifiSSID(C.CString(nif)))

	if ssid == "" {
		log.Error("Wi-Fi network interface ssid empty")
	}

	return ssid
}

func (session *Session) render(asset string) error {
	asset = "assets/templates/" + asset

	var t *template.Template

	c, ok := session.Config.Cache["template:"+asset]
	if !ok {
		log.Trace("Loading asset: %s", asset)
		a, err := session.Config.AssetLoader(asset)
		log.Trace("Creating template: %s", asset)
		t = template.New(asset)
		t.Delims(session.Config.LeftDelim, session.Config.RightDelim)
		if err != nil || a == nil {
			log.Error("Failed loading template %s: %s", asset, err)
			return err
		}
		log.Trace("Parsing template: %s", asset)
		_, err = t.Parse(string(a))
		if err != nil {
			log.Error("Failed parsing template %s: %s", asset, err)
			return err
		}
		log.Trace("Template parsed successfully: %s", asset)
		session.Config.Cache["template:"+asset] = t
	} else {
		t = c.(*template.Template)
		log.Trace("Template loaded from cache: %s", asset)
	}

	var b bytes.Buffer
	err := t.Execute(&b, session.Stash)
	if err != nil {
		log.Error("Failed executing template %s: %s", asset, err)
		return err
	}

	_, err = session.Response.Write(b.Bytes())

	if err != nil {
		log.Error("Error writing output for template %s: %s", asset, err)
		return err
	}

	return nil
}

func (session *Session) RenderException(status int, err error) {
	key := uuid.NewUUID().String()
	session.Response.Status = status
	session.Stash["Gotcha"].(map[string]interface{})["Error"] = err.Error()
	session.Stash["Gotcha"].(map[string]interface{})["ErrorId"] = key

	buf := make([]byte, 1<<16)
	n := runtime.Stack(buf, true)
	session.Stash["Gotcha"].(map[string]interface{})["Stack"] = fmt.Sprintf("%s", buf[:n])

	log.Error("Exception %s: %s\n%s", key, err.Error(), session.Stash["Gotcha"].(map[string]interface{})["Stack"])

	e := session.render("error.html")
	if e != nil {
		log.Error("Error rendering error page: %s", e)
		session.Response.Write([]byte("[" + key + "] Internal Server Error: " + err.Error() + "\n"))
	}
}

func (session *Session) RenderNotFound() {
	session.Stash["Gotcha"].(map[string]interface{})["Error"] = "Not found"
	session.Response.Status = 404

	e := session.render("notfound.html")
	if e != nil {
		log.Error("Error rendering not found page: %s", e)
	}
}

func RemoveModule(index string, source *Source, author *Author, pkg *Package) {
	out, err := os.OpenFile(index, os.O_RDWR|os.O_APPEND|os.O_CREATE, 0660)
	if err != nil {
		log.Error("Error opening index: %s", err.Error())
		return
	}

	out.Write([]byte(source.Name + " [" + source.URL + "]\n"))
	out.Write([]byte(" " + author.Name + " [" + author.URL + "]\n"))
	out.Write([]byte("  -" + pkg.Name + " => " + pkg.URL + "\n"))

	out.Close()
}

func LoadConfig(global string, workspaces []string) {
	// Load global environment
	log.Info("Loading global environment file: %s", global)
	cfg, err := LoadConfigFile(global)
	if err != nil {
		log.Error("Error loading global configuration: %s", err.Error())
	}
	if cfg != nil {
		GlobalConfigWorkspace = cfg
	}

	// Load workspaces
	for _, conf := range workspaces {
		log.Info("Loading workspace file: %s", conf)
		cfg, err := LoadConfigFile(conf)
		if err != nil {
			log.Error("Error loading workspace: %s", err.Error())
		}
		if cfg != nil {
			ConfigWorkspaces[cfg.Name] = cfg
		}
	}
}

func AppendToIndex(index string, source *Source, author *Author, pkg *Package) {
	out, err := os.OpenFile(index, os.O_RDWR|os.O_APPEND|os.O_CREATE, 0660)
	if err != nil {
		log.Error("Error opening index: %s", err.Error())
		return
	}

	out.Write([]byte(source.Name + " [" + source.URL + "]\n"))
	out.Write([]byte(" " + author.Name + " [" + author.URL + "]\n"))
	out.Write([]byte("  " + pkg.Name + " => " + pkg.URL + "\n"))
	for p, pk := range pkg.Provides {
		out.Write([]byte("   " + p + " (" + pk.Version + "): " + pk.File + "\n"))
	}

	out.Close()
}

func HasJSONXS() bool {
	cmd := exec.Command("perl", "-MJSON::XS", "-e", "")

	_, err := cmd.Output()
	if err != nil {
		log.Error("Error executing command: %s", err)
		return false
	}

	ps := cmd.ProcessState
	sy := ps.Sys().(syscall.WaitStatus)
	exit := sy.ExitStatus()

	if exit != 0 {
		return false
	}

	return true
}

func ParseCPANLine(line string) (*Dependency, error) {
	if len(line) == 0 {
		return nil, nil
	}

	matches := re.FindStringSubmatch(line)
	if len(matches) == 0 {
		log.Trace("Unable to parse line: %s", line)
		return nil, nil
	}

	module := matches[2]
	version := strings.Replace(matches[4], " ", "", -1)
	comment := matches[5]

	dependency, err := DependencyFromString(module, version)

	if strings.HasPrefix(strings.Trim(comment, " "), "# REQS: ") {
		comment = strings.TrimPrefix(strings.Trim(comment, " "), "# REQS: ")
		log.Trace("Found additional dependencies: %s", comment)
		for _, req := range strings.Split(comment, ";") {
			req = strings.Trim(req, " ")
			bits := strings.Split(req, "-")
			new_dep, err := DependencyFromString(bits[0], bits[1])
			if err != nil {
				log.Error("Error parsing REQS dependency: %s", req)
				continue
			}
			log.Trace("Added dependency: %s", new_dep)
			dependency.Additional = append(dependency.Additional, new_dep)
		}
	}

	if err != nil {
		return nil, err
	}

	log.Info("%s (%s %s)", module, dependency.Modifier, dependency.Version)

	return dependency, err
}

func (s *Source) Load() error {
	log.Debug("Loading source: %s", s)

	switch s.Type {
	case "CPAN":
		log.Debug("=> Got CPAN source")
		return s.loadCPANSource()
	case "BackPAN":
		log.Debug("=> Got BackPAN source")
		return s.loadBackPANSource()
	case "SmartPAN":
		log.Debug("=> Got SmartPAN source")
		return nil
	case "MetaCPAN":
		log.Debug("=> Got MetaCPAN source")
		return nil
	default:
		log.Error("Unrecognised source type: %s", s.Type)
		return errors.New(fmt.Sprintf("Unrecognised source: %s", s))
	}
}

func HasPerl() (bool, string) {
	cmd := exec.Command("perl", "-V::version:")

	out, err := cmd.Output()
	if err != nil {
		log.Error("Error executing command: %s", err)
		return false, ""
	}

	ps := cmd.ProcessState
	sy := ps.Sys().(syscall.WaitStatus)
	exit := sy.ExitStatus()

	if exit != 0 {
		return false, ""
	}

	s := string(out)
	s = strings.TrimSpace(s)
	l := strings.Split(s, "\n")
	v := l[0]

	return true, v
}