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// Parse data from the collectd network plugin
// This is modeled after collectd's own network.c
package gollectd
import (
"bytes"
"encoding/binary"
"errors"
"fmt"
"io/ioutil"
"strings"
)
const (
TypeCounter = 0
TypeGauge = 1
TypeDerive = 2
TypeAbsolute = 3
)
const (
// Values taken from commit 633c3966f7 of
// https://github.com/collectd/collectd/commits/master/src/network.h
ParseHost = 0x0000
ParseTime = 0x0001
ParsePlugin = 0x0002
ParsePluginInstance = 0x0003
ParseType = 0x0004
ParseTypeInstance = 0x0005
ParseValues = 0x0006
ParseInterval = 0x0007
ParseTimeHR = 0x0008
ParseIntervalHR = 0x0009
// Notifications
ParseMessage = 0x0100
ParseSeverity = 0x0101
ParseSignature = 0x0200
ParseEncryption = 0x0210
)
var ErrorInvalid = errors.New("Invalid packet")
var ErrorUnsupported = errors.New("Unsupported packet")
var ErrorUnknownType = errors.New("Unknown value type")
var ErrorUnknownDataType = errors.New("Unknown data source type")
var ValueTypeNames = map[string]uint8{
"absolute": TypeAbsolute,
"counter": TypeCounter,
"derive": TypeDerive,
"gauge": TypeGauge,
}
var ValueTypeValues = map[uint8]string{
TypeAbsolute: "absolute",
TypeCounter: "counter",
TypeDerive: "derive",
TypeGauge: "gauge",
}
type Packet struct {
Hostname string
Interval uint64
IntervalHR uint64
Plugin string
PluginInstance string
Time uint64
TimeHR uint64
Type string
TypeInstance string
Values []Value
}
type Type struct {
Name string
Type uint8
Min string
Max string
}
type Types map[string][]*Type
type Value struct {
Name string
Type uint8
TypeName string
Value float64
}
func (p Packet) FormatName() string {
metricName := p.Hostname + "/" + p.Plugin
if len(p.PluginInstance) > 0 {
metricName += "-" + p.PluginInstance
}
metricName += "/" + p.Type
if len(p.TypeInstance) > 0 {
metricName += "-" + p.TypeInstance
}
return metricName
}
func Packets(b []byte, types Types) (*[]Packet, error) {
packets := make([]Packet, 0)
buf := bytes.NewBuffer(b)
var packetHeader struct {
PartType uint16
PartLength uint16
}
var err error
var packet Packet
var time uint64
var valueCount uint16
var valueTypes []uint8
for buf.Len() > 0 {
partType := buf.Next(2)
if len(partType) < 2 {
return nil, ErrorInvalid
}
packetHeader.PartType = binary.BigEndian.Uint16(partType)
partLength := buf.Next(2)
if len(partLength) < 2 {
return nil, ErrorInvalid
}
packetHeader.PartLength = binary.BigEndian.Uint16(partLength)
if packetHeader.PartLength < 5 {
return nil, ErrorInvalid
}
nextPos := int(packetHeader.PartLength) - 4
partBytes := buf.Next(nextPos)
if len(partBytes) < nextPos {
return nil, ErrorInvalid
}
partBuffer := bytes.NewBuffer(partBytes)
switch packetHeader.PartType {
case ParseEncryption:
return nil, ErrorUnsupported
case ParseHost:
str := partBuffer.String()
packet.Hostname = str[0 : len(str)-1]
case ParseInterval:
err = binary.Read(partBuffer, binary.BigEndian, &time)
if err != nil {
return nil, err
}
packet.Interval = time
case ParseIntervalHR:
err = binary.Read(partBuffer, binary.BigEndian, &time)
if err != nil {
return nil, err
}
packet.IntervalHR = time
case ParseMessage:
// ignore (notification)
case ParsePlugin:
str := partBuffer.String()
packet.Plugin = str[0 : len(str)-1]
case ParsePluginInstance:
str := partBuffer.String()
packet.PluginInstance = str[0 : len(str)-1]
case ParseSeverity:
// ignore (notification)
case ParseSignature:
return nil, ErrorUnsupported
case ParseTime:
err = binary.Read(partBuffer, binary.BigEndian, &time)
if err != nil {
return nil, err
}
packet.Time = time
case ParseTimeHR:
err = binary.Read(partBuffer, binary.BigEndian, &time)
if err != nil {
return nil, err
}
packet.TimeHR = time
case ParseType:
str := partBuffer.String()
packet.Type = str[0 : len(str)-1]
case ParseTypeInstance:
str := partBuffer.String()
packet.TypeInstance = str[0 : len(str)-1]
case ParseValues:
err = binary.Read(partBuffer, binary.BigEndian, &valueCount)
if err != nil {
return nil, err
}
valueTypes = make([]uint8, valueCount, valueCount)
packet.Values = make([]Value, valueCount, valueCount)
var packetValue Value
err = binary.Read(partBuffer, binary.BigEndian, &valueTypes)
if err != nil {
return nil, err
}
for i, t := range valueTypes {
packetValue.Type = t
if typeName, ok := ValueTypeValues[t]; ok {
packetValue.TypeName = typeName
}
if _, ok := types[packet.Type]; ok {
packetValue.Name = types[packet.Type][i].Name
}
switch t {
case TypeAbsolute:
var value uint64
err = binary.Read(partBuffer, binary.BigEndian, &value)
if err != nil {
return nil, err
}
packetValue.Value = float64(value)
case TypeCounter:
var value uint64
err = binary.Read(partBuffer, binary.BigEndian, &value)
if err != nil {
return nil, err
}
packetValue.Value = float64(value)
case TypeDerive:
var value int64
err = binary.Read(partBuffer, binary.BigEndian, &value)
if err != nil {
return nil, err
}
packetValue.Value = float64(value)
case TypeGauge:
var value float64
err = binary.Read(partBuffer, binary.LittleEndian, &value)
if err != nil {
return nil, err
}
packetValue.Value = float64(value)
default:
return nil, ErrorUnknownType
}
packet.Values[i] = packetValue
}
packets = append(packets, packet)
default:
// Ignore unknown fields
}
}
return &packets, nil
}
func TypesDBFile(path string) (Types, error) {
// See https://collectd.org/documentation/manpages/types.db.5.shtml
b, err := ioutil.ReadFile(path)
if err != nil {
return nil, err
}
return TypesDB(b)
}
func TypesDB(b []byte) (Types, error) {
types := make(Types)
content := string(b)
lines := strings.Split(content, "\n")
for i, line := range lines {
line = strings.TrimSpace(line)
// Skip empty & comment lines
if line == "" || line[0] == '#' {
continue
}
dataSetName, dataSetSources, err := ParseDataSet(line)
if err != nil {
return nil, fmt.Errorf("Line %d: %s", i+1, err.Error())
}
types[dataSetName] = dataSetSources
}
return types, nil
}
// ParseDataSet parses one line from a collectd types.db file and returns
// the data-set name & a Type struct
func ParseDataSet(s string) (string, []*Type, error) {
splitFn := func(c rune) bool {
return c == '\t' || c == ' ' || c == ','
}
fields := strings.FieldsFunc(s, splitFn)
if len(fields) < 2 {
return "", nil, fmt.Errorf("Minimum of 2 fields required \"%s\"", s)
}
dataSetName := fields[0]
dataSetSources := make([]*Type, len(fields[1:]))
// Parse each data source
for i, field := range fields[1:] {
// Split data source fields
dsFields := strings.Split(field, ":")
if len(dsFields) != 4 {
return "", nil, fmt.Errorf("Exactly 4 fields required \"%s\"", field)
}
// Parse data source type
dsTypeStr := strings.ToLower(dsFields[1])
dsType, ok := ValueTypeNames[dsTypeStr]
if !ok {
return "", nil, fmt.Errorf("Invalid data-source type \"%s\"", dsTypeStr)
}
dataSetSources[i] = &Type{
Name: dsFields[0],
Type: dsType,
Min: dsFields[2],
Max: dsFields[3],
}
}
return dataSetName, dataSetSources, nil
}
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