Golang Compile Examples

Example #1

File: filter.go Project: Wikia/telegraf

// Compile all Filter lists into filter.Filter objects.
func (f *Filter) Compile() error {
	if len(f.NameDrop) == 0 &&
		len(f.NamePass) == 0 &&
		len(f.FieldDrop) == 0 &&
		len(f.FieldPass) == 0 &&
		len(f.TagInclude) == 0 &&
		len(f.TagExclude) == 0 &&
		len(f.TagPass) == 0 &&
		len(f.TagDrop) == 0 {
		return nil
	}

	f.isActive = true
	var err error
	f.nameDrop, err = filter.Compile(f.NameDrop)
	if err != nil {
		return fmt.Errorf("Error compiling 'namedrop', %s", err)
	}
	f.namePass, err = filter.Compile(f.NamePass)
	if err != nil {
		return fmt.Errorf("Error compiling 'namepass', %s", err)
	}

	f.fieldDrop, err = filter.Compile(f.FieldDrop)
	if err != nil {
		return fmt.Errorf("Error compiling 'fielddrop', %s", err)
	}
	f.fieldPass, err = filter.Compile(f.FieldPass)
	if err != nil {
		return fmt.Errorf("Error compiling 'fieldpass', %s", err)
	}

	f.tagExclude, err = filter.Compile(f.TagExclude)
	if err != nil {
		return fmt.Errorf("Error compiling 'tagexclude', %s", err)
	}
	f.tagInclude, err = filter.Compile(f.TagInclude)
	if err != nil {
		return fmt.Errorf("Error compiling 'taginclude', %s", err)
	}

	for i, _ := range f.TagDrop {
		f.TagDrop[i].filter, err = filter.Compile(f.TagDrop[i].Filter)
		if err != nil {
			return fmt.Errorf("Error compiling 'tagdrop', %s", err)
		}
	}
	for i, _ := range f.TagPass {
		f.TagPass[i].filter, err = filter.Compile(f.TagPass[i].Filter)
		if err != nil {
			return fmt.Errorf("Error compiling 'tagpass', %s", err)
		}
	}
	return nil
}

Example #2

File: varnish.go Project: Wikia/telegraf

// Gather collects the configured stats from varnish_stat and adds them to the
// Accumulator
//
// The prefix of each stat (eg MAIN, MEMPOOL, LCK, etc) will be used as a
// 'section' tag and all stats that share that prefix will be reported as fields
// with that tag
func (s *Varnish) Gather(acc telegraf.Accumulator) error {
	if s.filter == nil {
		var err error
		if len(s.Stats) == 0 {
			s.filter, err = filter.Compile(defaultStats)
		} else {
			// legacy support, change "all" -> "*":
			if s.Stats[0] == "all" {
				s.Stats[0] = "*"
			}
			s.filter, err = filter.Compile(s.Stats)
		}
		if err != nil {
			return err
		}
	}

	out, err := s.run(s.Binary)
	if err != nil {
		return fmt.Errorf("error gathering metrics: %s", err)
	}

	sectionMap := make(map[string]map[string]interface{})
	scanner := bufio.NewScanner(out)
	for scanner.Scan() {
		cols := strings.Fields(scanner.Text())
		if len(cols) < 2 {
			continue
		}
		if !strings.Contains(cols[0], ".") {
			continue
		}

		stat := cols[0]
		value := cols[1]

		if s.filter != nil && !s.filter.Match(stat) {
			continue
		}

		parts := strings.SplitN(stat, ".", 2)
		section := parts[0]
		field := parts[1]

		// Init the section if necessary
		if _, ok := sectionMap[section]; !ok {
			sectionMap[section] = make(map[string]interface{})
		}

		sectionMap[section][field], err = strconv.ParseUint(value, 10, 64)
		if err != nil {
			fmt.Fprintf(os.Stderr, "Expected a numeric value for %s = %v\n",
				stat, value)
		}
	}

	for section, fields := range sectionMap {
		tags := map[string]string{
			"section": section,
		}
		if len(fields) == 0 {
			continue
		}

		acc.AddFields("varnish", fields, tags)
	}

	return nil
}