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client_test.go
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client_test.go
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package promwrite_test
import (
"context"
"errors"
"io"
"net/http"
"net/http/httptest"
"testing"
"time"
"github.com/gogo/protobuf/proto"
"github.com/golang/snappy"
"github.com/stretchr/testify/require"
"github.com/prometheus/prometheus/prompb"
"github.com/eryajf/promwrite"
)
func TestClient(t *testing.T) {
t.Run("write with default options", func(t *testing.T) {
r := require.New(t)
receivedWriteRequest := make(chan *prompb.WriteRequest, 1)
srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
b, _ := io.ReadAll(req.Body)
parsed, err := parseWriteRequest(b)
r.NoError(err)
receivedWriteRequest <- parsed
w.WriteHeader(http.StatusOK)
}))
defer srv.Close()
client := promwrite.NewClient(srv.URL)
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
now := time.Now().UTC()
req := &promwrite.WriteRequest{
TimeSeries: []promwrite.TimeSeries{
{
Labels: []promwrite.Label{
{
Name: "__name__",
Value: "metric_a",
},
{
Name: "custom_label_a",
Value: "custom_value_a",
},
},
Sample: promwrite.Sample{
Time: now,
Value: 123,
},
},
{
Labels: []promwrite.Label{
{
Name: "__name__",
Value: "metric_b",
},
},
Sample: promwrite.Sample{
Time: now,
Value: 456,
},
},
},
}
_, err := client.Write(ctx, req)
r.NoError(err)
res := <-receivedWriteRequest
r.Len(res.Timeseries, 2)
r.Equal(prompb.TimeSeries{
Labels: []prompb.Label{
{
Name: "__name__",
Value: "metric_a",
},
{
Name: "custom_label_a",
Value: "custom_value_a",
},
},
Samples: []prompb.Sample{
{
Timestamp: now.UnixNano() / int64(time.Millisecond),
Value: 123,
},
},
}, res.Timeseries[0])
r.Equal(prompb.TimeSeries{
Labels: []prompb.Label{
{
Name: "__name__",
Value: "metric_b",
},
},
Samples: []prompb.Sample{
{
Timestamp: now.UnixNano() / int64(time.Millisecond),
Value: 456,
},
},
}, res.Timeseries[1])
})
t.Run("write with custom options", func(t *testing.T) {
r := require.New(t)
receivedWriteRequest := make(chan *prompb.WriteRequest, 1)
receivedHeaders := make(chan http.Header, 1)
srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
b, _ := io.ReadAll(req.Body)
parsed, err := parseWriteRequest(b)
r.NoError(err)
receivedWriteRequest <- parsed
receivedHeaders <- req.Header
w.WriteHeader(http.StatusAccepted)
}))
defer srv.Close()
sentRequest := make(chan *http.Request, 1)
client := promwrite.NewClient(
srv.URL,
promwrite.HttpClient(&http.Client{
Timeout: 5 * time.Second,
Transport: &customTestHttpClientTransport{
reqChan: sentRequest,
next: http.DefaultTransport,
},
}),
)
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
now := time.Now().UTC()
req := &promwrite.WriteRequest{
TimeSeries: []promwrite.TimeSeries{
{
Labels: []promwrite.Label{
{
Name: "__name__",
Value: "metric_a",
},
},
Sample: promwrite.Sample{
Time: now,
Value: 123,
},
},
},
}
_, err := client.Write(ctx, req, promwrite.WriteHeaders(map[string]string{"X-Scope-OrgID": "tenant1"}))
r.NoError(err)
res := <-receivedWriteRequest
r.Len(res.Timeseries, 1)
r.Equal(prompb.TimeSeries{
Labels: []prompb.Label{
{
Name: "__name__",
Value: "metric_a",
},
},
Samples: []prompb.Sample{
{
Timestamp: now.UnixNano() / int64(time.Millisecond),
Value: 123,
},
},
}, res.Timeseries[0])
sentReq := <-sentRequest
reqHeaders := sentReq.Header
recvHeaders := <-receivedHeaders
r.Equal("tenant1", reqHeaders.Get("X-Scope-OrgID"))
r.Equal("tenant1", recvHeaders.Get("X-Scope-OrgID"))
})
t.Run("write error", func(t *testing.T) {
r := require.New(t)
srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
w.WriteHeader(http.StatusBadRequest)
w.Write([]byte("ups"))
}))
defer srv.Close()
client := promwrite.NewClient(srv.URL)
_, err := client.Write(context.Background(), &promwrite.WriteRequest{})
r.EqualError(err, "promwrite: expected status 200, got 400: ups")
var writeErr *promwrite.WriteError
r.True(errors.As(err, &writeErr))
r.Equal(http.StatusBadRequest, writeErr.StatusCode())
})
}
func parseWriteRequest(src []byte) (*prompb.WriteRequest, error) {
decompressed, err := snappy.Decode(nil, src)
if err != nil {
return nil, err
}
var res prompb.WriteRequest
if err := proto.Unmarshal(decompressed, &res); err != nil {
return nil, err
}
return &res, nil
}
type customTestHttpClientTransport struct {
reqChan chan *http.Request
next http.RoundTripper
}
func (t *customTestHttpClientTransport) RoundTrip(req *http.Request) (*http.Response, error) {
t.reqChan <- req
return t.next.RoundTrip(req)
}