// 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
}
// 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
}