2016-11-22 12:51:57 +00:00
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package metric
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import (
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"bytes"
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"fmt"
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"hash/fnv"
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"sort"
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"strconv"
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"strings"
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"time"
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"github.com/influxdata/telegraf"
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// TODO remove
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"github.com/influxdata/influxdb/client/v2"
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)
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2016-11-28 18:19:35 +00:00
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const MaxInt = int(^uint(0) >> 1)
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2016-11-22 12:51:57 +00:00
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var (
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// escaper is for escaping:
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// - tag keys
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// - tag values
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// - field keys
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// see https://docs.influxdata.com/influxdb/v1.0/write_protocols/line_protocol_tutorial/#special-characters-and-keywords
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escaper = strings.NewReplacer(`,`, `\,`, `"`, `\"`, ` `, `\ `, `=`, `\=`)
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// nameEscaper is for escaping measurement names only.
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// see https://docs.influxdata.com/influxdb/v1.0/write_protocols/line_protocol_tutorial/#special-characters-and-keywords
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nameEscaper = strings.NewReplacer(`,`, `\,`, ` `, `\ `)
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// stringFieldEscaper is for escaping string field values only.
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// see https://docs.influxdata.com/influxdb/v1.0/write_protocols/line_protocol_tutorial/#special-characters-and-keywords
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stringFieldEscaper = strings.NewReplacer(`"`, `\"`)
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)
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func New(
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name string,
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tags map[string]string,
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fields map[string]interface{},
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t time.Time,
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mType ...telegraf.ValueType,
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) (telegraf.Metric, error) {
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if len(fields) == 0 {
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return nil, fmt.Errorf("Metric cannot be made without any fields")
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}
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var thisType telegraf.ValueType
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if len(mType) > 0 {
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thisType = mType[0]
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} else {
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thisType = telegraf.Untyped
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}
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m := &metric{
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name: []byte(nameEscaper.Replace(name)),
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t: []byte(fmt.Sprint(t.UnixNano())),
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nsec: t.UnixNano(),
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mType: thisType,
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}
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2016-11-29 18:06:14 +00:00
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// pre-allocate exact size of the tags slice
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taglen := 0
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2016-11-22 12:51:57 +00:00
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for k, v := range tags {
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2016-11-29 18:06:14 +00:00
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taglen += 2 + len(escaper.Replace(k)) + len(escaper.Replace(v))
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2016-11-22 12:51:57 +00:00
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}
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2016-11-29 18:06:14 +00:00
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m.tags = make([]byte, taglen)
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2016-11-22 12:51:57 +00:00
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i := 0
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2016-11-29 18:06:14 +00:00
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for k, v := range tags {
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m.tags[i] = ','
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i++
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i += copy(m.tags[i:], escaper.Replace(k))
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m.tags[i] = '='
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i++
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i += copy(m.tags[i:], escaper.Replace(v))
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}
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// pre-allocate capacity of the fields slice
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fieldlen := 0
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for k, _ := range fields {
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// 10 bytes is completely arbitrary, but will at least prevent some
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// amount of allocations. There's a small possibility this will create
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// slightly more allocations for a metric that has many short fields.
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fieldlen += len(k) + 10
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}
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m.fields = make([]byte, 0, fieldlen)
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i = 0
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2016-11-22 12:51:57 +00:00
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for k, v := range fields {
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if i != 0 {
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m.fields = append(m.fields, ',')
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}
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m.fields = appendField(m.fields, k, v)
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i++
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}
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return m, nil
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}
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// indexUnescapedByte finds the index of the first byte equal to b in buf that
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// is not escaped. Returns -1 if not found.
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func indexUnescapedByte(buf []byte, b byte) int {
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var keyi int
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for {
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i := bytes.IndexByte(buf[keyi:], b)
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if i == -1 {
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return -1
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} else if i == 0 {
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break
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}
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keyi += i
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if countBackslashes(buf, keyi-1)%2 == 0 {
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break
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} else {
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keyi++
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}
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}
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return keyi
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}
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// countBackslashes counts the number of preceding backslashes starting at
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// the 'start' index.
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func countBackslashes(buf []byte, index int) int {
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var count int
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for {
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2016-11-28 18:19:35 +00:00
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if index < 0 {
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return count
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}
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2016-11-22 12:51:57 +00:00
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if buf[index] == '\\' {
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count++
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index--
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} else {
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break
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}
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}
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return count
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}
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type metric struct {
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name []byte
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tags []byte
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fields []byte
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t []byte
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mType telegraf.ValueType
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aggregate bool
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// cached values for reuse in "get" functions
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hashID uint64
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nsec int64
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fieldMap map[string]interface{}
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tagMap map[string]string
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}
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func (m *metric) Point() *client.Point {
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2016-11-28 18:19:35 +00:00
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c, _ := client.NewPoint(m.Name(), m.Tags(), m.Fields(), m.Time())
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return c
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2016-11-22 12:51:57 +00:00
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}
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func (m *metric) String() string {
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2016-11-29 18:06:14 +00:00
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return string(m.name) + string(m.tags) + " " + string(m.fields) + " " + string(m.t) + "\n"
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2016-11-22 12:51:57 +00:00
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}
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func (m *metric) SetAggregate(b bool) {
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m.aggregate = b
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}
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func (m *metric) IsAggregate() bool {
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return m.aggregate
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}
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func (m *metric) Type() telegraf.ValueType {
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return m.mType
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}
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func (m *metric) Len() int {
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2016-11-29 18:06:14 +00:00
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// 3 is for 2 spaces surrounding the fields array + newline at the end.
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return len(m.name) + len(m.tags) + len(m.fields) + len(m.t) + 3
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2016-11-22 12:51:57 +00:00
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}
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func (m *metric) Serialize() []byte {
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tmp := make([]byte, m.Len())
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2016-11-28 18:19:35 +00:00
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i := 0
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2016-11-29 18:06:14 +00:00
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i += copy(tmp[i:], m.name)
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i += copy(tmp[i:], m.tags)
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2016-11-28 18:19:35 +00:00
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tmp[i] = ' '
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i++
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2016-11-29 18:06:14 +00:00
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i += copy(tmp[i:], m.fields)
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2016-11-28 18:19:35 +00:00
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tmp[i] = ' '
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i++
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2016-11-29 18:06:14 +00:00
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i += copy(tmp[i:], m.t)
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2016-11-28 18:19:35 +00:00
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tmp[i] = '\n'
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2016-11-22 12:51:57 +00:00
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return tmp
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}
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func (m *metric) Fields() map[string]interface{} {
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if m.fieldMap != nil {
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// TODO should we return a copy?
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return m.fieldMap
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}
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m.fieldMap = map[string]interface{}{}
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2016-11-28 18:19:35 +00:00
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i := 0
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2016-11-22 12:51:57 +00:00
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for {
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if i >= len(m.fields) {
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break
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}
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// end index of field key
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i1 := indexUnescapedByte(m.fields[i:], '=')
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if i1 == -1 {
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break
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}
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// start index of field value
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i2 := i1 + 1
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2016-11-28 18:19:35 +00:00
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2016-11-22 12:51:57 +00:00
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// end index of field value
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2016-11-28 18:19:35 +00:00
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var i3 int
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if m.fields[i:][i2] == '"' {
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i3 = indexUnescapedByte(m.fields[i:][i2+1:], '"')
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if i3 == -1 {
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i3 = len(m.fields[i:])
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}
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i3 += i2 + 2 // increment index to the comma
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} else {
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i3 = indexUnescapedByte(m.fields[i:], ',')
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if i3 == -1 {
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i3 = len(m.fields[i:])
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}
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2016-11-22 12:51:57 +00:00
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}
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switch m.fields[i:][i2] {
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case '"':
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// string field
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m.fieldMap[string(m.fields[i:][0:i1])] = string(m.fields[i:][i2+1 : i3-1])
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case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
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// number field
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switch m.fields[i:][i3-1] {
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case 'i':
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// integer field
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n, err := strconv.ParseInt(string(m.fields[i:][i2:i3-1]), 10, 64)
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if err == nil {
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m.fieldMap[string(m.fields[i:][0:i1])] = n
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} else {
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// TODO handle error or just ignore field silently?
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}
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default:
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// float field
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n, err := strconv.ParseFloat(string(m.fields[i:][i2:i3]), 64)
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if err == nil {
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m.fieldMap[string(m.fields[i:][0:i1])] = n
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} else {
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// TODO handle error or just ignore field silently?
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}
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}
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case 'T', 't':
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2016-11-28 18:19:35 +00:00
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m.fieldMap[string(m.fields[i:][0:i1])] = true
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2016-11-22 12:51:57 +00:00
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case 'F', 'f':
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2016-11-28 18:19:35 +00:00
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m.fieldMap[string(m.fields[i:][0:i1])] = false
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2016-11-22 12:51:57 +00:00
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default:
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// TODO handle unsupported field type
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}
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i += i3 + 1
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}
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return m.fieldMap
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}
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func (m *metric) Tags() map[string]string {
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if m.tagMap != nil {
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// TODO should we return a copy?
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return m.tagMap
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}
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m.tagMap = map[string]string{}
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if len(m.tags) == 0 {
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return m.tagMap
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}
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i := 0
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for {
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// start index of tag key
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i0 := indexUnescapedByte(m.tags[i:], ',') + 1
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if i0 == 0 {
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// didn't find a tag start
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break
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}
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// end index of tag key
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i1 := indexUnescapedByte(m.tags[i:], '=')
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// start index of tag value
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i2 := i1 + 1
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// end index of tag value (starting from i2)
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i3 := indexUnescapedByte(m.tags[i+i2:], ',')
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if i3 == -1 {
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m.tagMap[string(m.tags[i:][i0:i1])] = string(m.tags[i:][i2:])
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break
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}
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m.tagMap[string(m.tags[i:][i0:i1])] = string(m.tags[i:][i2 : i2+i3])
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// increment start index for the next tag
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i += i2 + i3
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}
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return m.tagMap
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}
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func (m *metric) Name() string {
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return string(m.name)
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}
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func (m *metric) Time() time.Time {
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// assume metric has been verified already and ignore error:
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if m.nsec == 0 {
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m.nsec, _ = strconv.ParseInt(string(m.t), 10, 64)
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}
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return time.Unix(0, m.nsec)
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}
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func (m *metric) UnixNano() int64 {
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// assume metric has been verified already and ignore error:
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if m.nsec == 0 {
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m.nsec, _ = strconv.ParseInt(string(m.t), 10, 64)
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}
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return m.nsec
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}
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func (m *metric) SetName(name string) {
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2016-11-29 18:06:14 +00:00
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m.hashID = 0
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2016-11-22 12:51:57 +00:00
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m.name = []byte(nameEscaper.Replace(name))
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}
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func (m *metric) SetPrefix(prefix string) {
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2016-11-29 18:06:14 +00:00
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m.hashID = 0
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2016-11-22 12:51:57 +00:00
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m.name = append([]byte(nameEscaper.Replace(prefix)), m.name...)
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}
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func (m *metric) SetSuffix(suffix string) {
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2016-11-29 18:06:14 +00:00
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m.hashID = 0
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2016-11-22 12:51:57 +00:00
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m.name = append(m.name, []byte(nameEscaper.Replace(suffix))...)
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}
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func (m *metric) AddTag(key, value string) {
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m.RemoveTag(key)
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m.tags = append(m.tags, []byte(","+escaper.Replace(key)+"="+escaper.Replace(value))...)
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}
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func (m *metric) HasTag(key string) bool {
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i := bytes.Index(m.tags, []byte(escaper.Replace(key)+"="))
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if i == -1 {
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return false
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}
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return true
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}
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func (m *metric) RemoveTag(key string) bool {
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m.tagMap = nil
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m.hashID = 0
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2016-11-28 18:19:35 +00:00
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2016-11-22 12:51:57 +00:00
|
|
|
i := bytes.Index(m.tags, []byte(escaper.Replace(key)+"="))
|
|
|
|
if i == -1 {
|
|
|
|
return false
|
|
|
|
}
|
|
|
|
|
|
|
|
tmp := m.tags[0 : i-1]
|
|
|
|
j := indexUnescapedByte(m.tags[i:], ',')
|
|
|
|
if j != -1 {
|
|
|
|
tmp = append(tmp, m.tags[i+j:]...)
|
|
|
|
}
|
|
|
|
m.tags = tmp
|
|
|
|
return true
|
|
|
|
}
|
|
|
|
|
|
|
|
func (m *metric) AddField(key string, value interface{}) {
|
|
|
|
m.fieldMap = nil
|
|
|
|
m.fields = append(m.fields, ',')
|
|
|
|
appendField(m.fields, key, value)
|
|
|
|
}
|
|
|
|
|
|
|
|
func (m *metric) HasField(key string) bool {
|
|
|
|
i := bytes.Index(m.fields, []byte(escaper.Replace(key)+"="))
|
|
|
|
if i == -1 {
|
|
|
|
return false
|
|
|
|
}
|
|
|
|
return true
|
|
|
|
}
|
|
|
|
|
|
|
|
func (m *metric) RemoveField(key string) bool {
|
|
|
|
m.fieldMap = nil
|
|
|
|
m.hashID = 0
|
|
|
|
i := bytes.Index(m.fields, []byte(escaper.Replace(key)+"="))
|
|
|
|
if i == -1 {
|
|
|
|
return false
|
|
|
|
}
|
|
|
|
|
|
|
|
tmp := m.fields[0 : i-1]
|
|
|
|
j := indexUnescapedByte(m.fields[i:], ',')
|
|
|
|
if j != -1 {
|
|
|
|
tmp = append(tmp, m.fields[i+j:]...)
|
|
|
|
}
|
|
|
|
m.fields = tmp
|
|
|
|
return true
|
|
|
|
}
|
|
|
|
|
|
|
|
func (m *metric) Copy() telegraf.Metric {
|
2016-11-28 18:19:35 +00:00
|
|
|
mOut := metric{
|
|
|
|
name: make([]byte, len(m.name)),
|
|
|
|
tags: make([]byte, len(m.tags)),
|
|
|
|
fields: make([]byte, len(m.fields)),
|
|
|
|
t: make([]byte, len(m.t)),
|
2016-11-22 12:51:57 +00:00
|
|
|
}
|
2016-11-28 18:19:35 +00:00
|
|
|
copy(mOut.name, m.name)
|
|
|
|
copy(mOut.tags, m.tags)
|
|
|
|
copy(mOut.fields, m.fields)
|
|
|
|
copy(mOut.t, m.t)
|
|
|
|
return &mOut
|
2016-11-22 12:51:57 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
func (m *metric) HashID() uint64 {
|
|
|
|
if m.hashID == 0 {
|
|
|
|
h := fnv.New64a()
|
|
|
|
h.Write(m.name)
|
|
|
|
|
|
|
|
tags := m.Tags()
|
|
|
|
tmp := make([]string, len(tags))
|
|
|
|
i := 0
|
|
|
|
for k, v := range tags {
|
|
|
|
tmp[i] = k + v
|
|
|
|
i++
|
|
|
|
}
|
|
|
|
sort.Strings(tmp)
|
|
|
|
|
|
|
|
for _, s := range tmp {
|
|
|
|
h.Write([]byte(s))
|
|
|
|
}
|
|
|
|
|
|
|
|
m.hashID = h.Sum64()
|
|
|
|
}
|
|
|
|
return m.hashID
|
|
|
|
}
|
|
|
|
|
|
|
|
func appendField(b []byte, k string, v interface{}) []byte {
|
|
|
|
b = append(b, []byte(escaper.Replace(k)+"=")...)
|
|
|
|
|
|
|
|
// check popular types first
|
|
|
|
switch v := v.(type) {
|
|
|
|
case float64:
|
|
|
|
b = strconv.AppendFloat(b, v, 'f', -1, 64)
|
|
|
|
case int64:
|
|
|
|
b = strconv.AppendInt(b, v, 10)
|
|
|
|
b = append(b, 'i')
|
|
|
|
case string:
|
|
|
|
b = append(b, '"')
|
|
|
|
b = append(b, []byte(stringFieldEscaper.Replace(v))...)
|
|
|
|
b = append(b, '"')
|
|
|
|
case bool:
|
|
|
|
b = strconv.AppendBool(b, v)
|
|
|
|
case int32:
|
|
|
|
b = strconv.AppendInt(b, int64(v), 10)
|
|
|
|
b = append(b, 'i')
|
|
|
|
case int16:
|
|
|
|
b = strconv.AppendInt(b, int64(v), 10)
|
|
|
|
b = append(b, 'i')
|
|
|
|
case int8:
|
|
|
|
b = strconv.AppendInt(b, int64(v), 10)
|
|
|
|
b = append(b, 'i')
|
|
|
|
case int:
|
|
|
|
b = strconv.AppendInt(b, int64(v), 10)
|
|
|
|
b = append(b, 'i')
|
2016-11-28 18:19:35 +00:00
|
|
|
case uint64:
|
|
|
|
// Cap uints above the maximum int value
|
|
|
|
var intv int64
|
|
|
|
if v <= uint64(MaxInt) {
|
|
|
|
intv = int64(v)
|
|
|
|
} else {
|
|
|
|
intv = int64(MaxInt)
|
|
|
|
}
|
|
|
|
b = strconv.AppendInt(b, intv, 10)
|
|
|
|
b = append(b, 'i')
|
2016-11-22 12:51:57 +00:00
|
|
|
case uint32:
|
|
|
|
b = strconv.AppendInt(b, int64(v), 10)
|
|
|
|
b = append(b, 'i')
|
|
|
|
case uint16:
|
|
|
|
b = strconv.AppendInt(b, int64(v), 10)
|
|
|
|
b = append(b, 'i')
|
|
|
|
case uint8:
|
|
|
|
b = strconv.AppendInt(b, int64(v), 10)
|
|
|
|
b = append(b, 'i')
|
|
|
|
case uint:
|
2016-11-28 18:19:35 +00:00
|
|
|
// Cap uints above the maximum int value
|
|
|
|
var intv int64
|
|
|
|
if v <= uint(MaxInt) {
|
|
|
|
intv = int64(v)
|
|
|
|
} else {
|
|
|
|
intv = int64(MaxInt)
|
|
|
|
}
|
|
|
|
b = strconv.AppendInt(b, intv, 10)
|
2016-11-22 12:51:57 +00:00
|
|
|
b = append(b, 'i')
|
|
|
|
case float32:
|
|
|
|
b = strconv.AppendFloat(b, float64(v), 'f', -1, 32)
|
|
|
|
case []byte:
|
|
|
|
b = append(b, v...)
|
|
|
|
case nil:
|
|
|
|
// skip
|
|
|
|
default:
|
|
|
|
// Can't determine the type, so convert to string
|
|
|
|
b = append(b, '"')
|
|
|
|
b = append(b, []byte(stringFieldEscaper.Replace(fmt.Sprintf("%v", v)))...)
|
|
|
|
b = append(b, '"')
|
|
|
|
}
|
|
|
|
|
|
|
|
return b
|
|
|
|
}
|