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handler.go
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handler.go
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//nolint
package influx
import (
"bytes"
"errors"
"strconv"
"time"
"github.com/circonus-labs/circonus-unified-agent/cua"
"github.com/circonus-labs/circonus-unified-agent/metric"
)
// MetricHandler implements the Handler interface and produces cua.Metric.
type MetricHandler struct {
// err error
timePrecision time.Duration
timeFunc TimeFunc
metric cua.Metric
}
func NewMetricHandler() *MetricHandler {
return &MetricHandler{
timePrecision: time.Nanosecond,
timeFunc: time.Now,
}
}
func (h *MetricHandler) SetTimePrecision(p time.Duration) {
h.timePrecision = p
// When the timestamp is omitted from the metric, the timestamp
// comes from the server clock, truncated to the nearest unit of
// measurement provided in precision.
//
// When a timestamp is provided in the metric, precision is
// overloaded to hold the unit of measurement of the timestamp.
}
func (h *MetricHandler) SetTimeFunc(f TimeFunc) {
h.timeFunc = f
}
func (h *MetricHandler) Metric() (cua.Metric, error) {
if h.metric.Time().IsZero() {
h.metric.SetTime(h.timeFunc().Truncate(h.timePrecision))
}
return h.metric, nil
}
func (h *MetricHandler) SetMeasurement(name []byte) error {
var err error
h.metric, err = metric.New(nameUnescape(name),
nil, nil, time.Time{})
return err
}
func (h *MetricHandler) AddTag(key []byte, value []byte) error {
tk := unescape(key)
tv := unescape(value)
h.metric.AddTag(tk, tv)
return nil
}
func (h *MetricHandler) AddInt(key []byte, value []byte) error {
fk := unescape(key)
fv, err := parseIntBytes(bytes.TrimSuffix(value, []byte("i")), 10, 64)
if err != nil {
var numErr *strconv.NumError
if errors.As(err, &numErr) {
return numErr.Err
}
return err
}
h.metric.AddField(fk, fv)
return nil
}
func (h *MetricHandler) AddUint(key []byte, value []byte) error {
fk := unescape(key)
fv, err := parseUintBytes(bytes.TrimSuffix(value, []byte("u")), 10, 64)
if err != nil {
var numErr *strconv.NumError
if errors.As(err, &numErr) {
return numErr.Err
}
return err
}
h.metric.AddField(fk, fv)
return nil
}
func (h *MetricHandler) AddFloat(key []byte, value []byte) error {
fk := unescape(key)
fv, err := parseFloatBytes(value, 64)
if err != nil {
var numErr *strconv.NumError
if errors.As(err, &numErr) {
return numErr.Err
}
return err
}
h.metric.AddField(fk, fv)
return nil
}
func (h *MetricHandler) AddString(key []byte, value []byte) error {
fk := unescape(key)
fv := stringFieldUnescape(value)
h.metric.AddField(fk, fv)
return nil
}
func (h *MetricHandler) AddBool(key []byte, value []byte) error {
fk := unescape(key)
fv, err := parseBoolBytes(value)
if err != nil {
return errors.New("unparseable bool")
}
h.metric.AddField(fk, fv)
return nil
}
func (h *MetricHandler) SetTimestamp(tm []byte) error {
v, err := parseIntBytes(tm, 10, 64)
if err != nil {
var numErr *strconv.NumError
if errors.As(err, &numErr) {
return numErr.Err
}
return err
}
//time precision is overloaded to mean time unit here
ns := v * int64(h.timePrecision)
h.metric.SetTime(time.Unix(0, ns))
return nil
}