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Promql: Add clarifying note to Point.MarshalJSON

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Signed-off-by: beorn7 <beorn@grafana.com>
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beorn7 2021-11-25 13:32:37 +01:00
parent 2a3d62ac84
commit 9672ade191
1 changed files with 8 additions and 0 deletions
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8
promql/value.go
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@ -88,6 +88,14 @@ func (p Point) String() string {
} }
// MarshalJSON implements json.Marshaler. // MarshalJSON implements json.Marshaler.
//
// JSON marshaling is only needed for the HTTP API. Since Point is such a
// frequently marshaled type, it gets an optimized treatment directly in
// web/api/v1/api.go. Therefore, this method is unused within Prometheus. It is
// still provided here as convenience for debugging and for other users of this
// code. Also note that the different marshaling implementations might lead to
// slightly different results in terms of formatting and rounding of the
// timestamp.
func (p Point) MarshalJSON() ([]byte, error) { func (p Point) MarshalJSON() ([]byte, error) {
v := strconv.FormatFloat(p.V, 'f', -1, 64) v := strconv.FormatFloat(p.V, 'f', -1, 64)
return json.Marshal([...]interface{}{float64(p.T) / 1000, v}) return json.Marshal([...]interface{}{float64(p.T) / 1000, v})