github.com/m3db/m3@v1.5.0/src/query/test/handler.go (about)

     1  // Copyright (c) 2018 Uber Technologies, Inc.
     2  //
     3  // Permission is hereby granted, free of charge, to any person obtaining a copy
     4  // of this software and associated documentation files (the "Software"), to deal
     5  // in the Software without restriction, including without limitation the rights
     6  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     7  // copies of the Software, and to permit persons to whom the Software is
     8  // furnished to do so, subject to the following conditions:
     9  //
    10  // The above copyright notice and this permission notice shall be included in
    11  // all copies or substantial portions of the Software.
    12  //
    13  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    14  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    15  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    16  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    17  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    18  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    19  // THE SOFTWARE.
    20  
    21  package test
    22  
    23  import (
    24  	"bytes"
    25  	"io"
    26  	"net/http"
    27  	"testing"
    28  	"time"
    29  
    30  	"github.com/m3db/m3/src/query/generated/proto/prompb"
    31  
    32  	"github.com/golang/protobuf/proto"
    33  	"github.com/golang/snappy"
    34  )
    35  
    36  // SlowHandler slows down a request by delay
    37  type SlowHandler struct {
    38  	handler http.Handler
    39  	delay   time.Duration
    40  }
    41  
    42  // NewSlowHandler creates a new slow handler
    43  func NewSlowHandler(handler http.Handler, delay time.Duration) *SlowHandler {
    44  	return &SlowHandler{handler: handler, delay: delay}
    45  }
    46  
    47  // ServeHTTP implements http.handler
    48  func (h *SlowHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
    49  	time.Sleep(h.delay)
    50  	h.handler.ServeHTTP(w, r)
    51  }
    52  
    53  // GeneratePromReadRequest generates a sample prometheus remote read request
    54  func GeneratePromReadRequest() *prompb.ReadRequest {
    55  	req := &prompb.ReadRequest{
    56  		Queries: []*prompb.Query{{
    57  			Matchers: []*prompb.LabelMatcher{
    58  				{Type: prompb.LabelMatcher_EQ, Name: []byte("eq"), Value: []byte("a")},
    59  			},
    60  			StartTimestampMs: time.Now().Add(-1*time.Hour*24).UnixNano() / int64(time.Millisecond),
    61  			EndTimestampMs:   time.Now().UnixNano() / int64(time.Millisecond),
    62  		}},
    63  	}
    64  	return req
    65  }
    66  
    67  // GeneratePromReadBody generates a sample snappy encoded prometheus remote read request body
    68  func GeneratePromReadBody(t *testing.T) io.Reader {
    69  	req := GeneratePromReadRequest()
    70  	data, err := proto.Marshal(req)
    71  	if err != nil {
    72  		t.Fatal("couldn't marshal prometheus request")
    73  	}
    74  
    75  	compressed := snappy.Encode(nil, data)
    76  	// Uncomment the line below to write the data into a file useful for integration testing
    77  	//ioutil.WriteFile("/tmp/dat1", compressed, 0644)
    78  	b := bytes.NewReader(compressed)
    79  	return b
    80  }