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// Copyright 2018 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package expfmt
import (
"bytes"
"github.com/golang/protobuf/proto"
dto "github.com/prometheus/client_model/go"
"net/http"
"testing"
)
func TestNegotiate(t *testing.T) {
acceptValuePrefix := "application/vnd.google.protobuf;proto=io.prometheus.client.MetricFamily"
tests := []struct {
name string
acceptHeaderValue string
expectedFmt string
}{
{
name: "delimited format",
acceptHeaderValue: acceptValuePrefix + ";encoding=delimited",
expectedFmt: string(FmtProtoDelim),
},
{
name: "text format",
acceptHeaderValue: acceptValuePrefix + ";encoding=text",
expectedFmt: string(FmtProtoText),
},
{
name: "compact text format",
acceptHeaderValue: acceptValuePrefix + ";encoding=compact-text",
expectedFmt: string(FmtProtoCompact),
},
{
name: "plain text format",
acceptHeaderValue: "text/plain;version=0.0.4",
expectedFmt: string(FmtText),
},
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
h := http.Header{}
h.Add(hdrAccept, test.acceptHeaderValue)
actualFmt := string(Negotiate(h))
if actualFmt != test.expectedFmt {
t.Errorf("expected Negotiate to return format %s, but got %s instead", test.expectedFmt, actualFmt)
}
})
}
}
func TestEncode(t *testing.T) {
var buff bytes.Buffer
delimEncoder := NewEncoder(&buff, FmtProtoDelim)
metric := &dto.MetricFamily{
Name: proto.String("foo_metric"),
Type: dto.MetricType_UNTYPED.Enum(),
Metric: []*dto.Metric{
{
Untyped: &dto.Untyped{
Value: proto.Float64(1.234),
},
},
},
}
err := delimEncoder.Encode(metric)
if err != nil {
t.Errorf("unexpected error during encode: %s", err.Error())
}
out := buff.Bytes()
if len(out) == 0 {
t.Errorf("expected the output bytes buffer to be non-empty")
}
buff.Reset()
compactEncoder := NewEncoder(&buff, FmtProtoCompact)
err = compactEncoder.Encode(metric)
if err != nil {
t.Errorf("unexpected error during encode: %s", err.Error())
}
out = buff.Bytes()
if len(out) == 0 {
t.Errorf("expected the output bytes buffer to be non-empty")
}
buff.Reset()
protoTextEncoder := NewEncoder(&buff, FmtProtoText)
err = protoTextEncoder.Encode(metric)
if err != nil {
t.Errorf("unexpected error during encode: %s", err.Error())
}
out = buff.Bytes()
if len(out) == 0 {
t.Errorf("expected the output bytes buffer to be non-empty")
}
buff.Reset()
textEncoder := NewEncoder(&buff, FmtText)
err = textEncoder.Encode(metric)
if err != nil {
t.Errorf("unexpected error during encode: %s", err.Error())
}
out = buff.Bytes()
if len(out) == 0 {
t.Errorf("expected the output bytes buffer to be non-empty")
}
expected := "# TYPE foo_metric untyped\n" +
"foo_metric 1.234\n"
if string(out) != expected {
t.Errorf("expected TextEncoder to return %s, but got %s instead", expected, string(out))
}
}
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