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a5c427bac4
Allocations are reduced by implementing custom json parser via fastjson
lib.
The change also re-uses `promInstant` object in attempt to reduce number
of
allocations when parsing big responses, as usually happens with heavy
recording rules.
```
name old allocs/op new allocs/op delta
ParsePrometheusResponse/Instant-10 9.65k ± 0% 5.60k ± 0% ~ (p=1.000 n=1+1)
```
Signed-off-by: hagen1778 <roman@victoriametrics.com>
---------
Signed-off-by: hagen1778 <roman@victoriametrics.com>
(cherry picked from commit 4f0525852f)
73 lines
2 KiB
Go
73 lines
2 KiB
Go
package datasource
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import (
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"reflect"
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"testing"
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)
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func TestPromInstant_UnmarshalPositive(t *testing.T) {
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f := func(data string, exp []Metric) {
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t.Helper()
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var pi promInstant
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err := pi.Unmarshal([]byte(data))
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if err != nil {
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t.Fatalf("unexpected unmarshal err %v; \n %v", err, string(data))
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}
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got, _ := pi.metrics()
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if !reflect.DeepEqual(got, exp) {
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t.Fatalf("expected to get:\n%v\ngot instead:\n%v", exp, got)
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}
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}
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f(`[{"metric":{"__name__":"up"},"value":[1583780000,"42"]}]`, []Metric{
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{
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Labels: []Label{{Name: "__name__", Value: "up"}},
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Timestamps: []int64{1583780000},
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Values: []float64{42},
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},
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})
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f(`[
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{"metric":{"__name__":"up"},"value":[1583780000,"42"]},
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{"metric":{"__name__":"foo"},"value":[1583780001,"7"]},
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{"metric":{"__name__":"baz", "instance":"bar"},"value":[1583780002,"8"]}]`, []Metric{
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{
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Labels: []Label{{Name: "__name__", Value: "up"}},
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Timestamps: []int64{1583780000},
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Values: []float64{42},
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},
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{
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Labels: []Label{{Name: "__name__", Value: "foo"}},
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Timestamps: []int64{1583780001},
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Values: []float64{7},
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},
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{
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Labels: []Label{{Name: "__name__", Value: "baz"}, {Name: "instance", Value: "bar"}},
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Timestamps: []int64{1583780002},
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Values: []float64{8},
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},
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})
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}
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func TestPromInstant_UnmarshalNegative(t *testing.T) {
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f := func(data string) {
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t.Helper()
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var pi promInstant
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err := pi.Unmarshal([]byte(data))
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if err == nil {
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t.Fatalf("expected to get an error; got nil instead")
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}
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}
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f(``)
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f(`foo`)
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f(`[{"metric":{"__name__":"up"},"value":[1583780000,"42"]},`)
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f(`[{"metric":{"__name__"},"value":[1583780000,"42"]},`)
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// no `metric` object
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f(`[{"value":[1583780000,"42"]}]`)
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// no `value` object
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f(`[{"metric":{"__name__":"up"}}]`)
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// less than 2 values in `value` object
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f(`[{"metric":{"__name__":"up"},"value":["42"]}]`)
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f(`[{"metric":{"__name__":"up"},"value":[1583780000]}]`)
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// non-numeric sample value
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f(`[{"metric":{"__name__":"up"},"value":[1583780000,"foo"]}]`)
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}
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