github.com/waldiirawan/apm-agent-go/v2@v2.2.2/internal/apmcloudutil/provider_test.go (about)

     1  // Licensed to Elasticsearch B.V. under one or more contributor
     2  // license agreements. See the NOTICE file distributed with
     3  // this work for additional information regarding copyright
     4  // ownership. Elasticsearch B.V. licenses this file to you under
     5  // the Apache License, Version 2.0 (the "License"); you may
     6  // not use this file except in compliance with the License.
     7  // You may obtain a copy of the License at
     8  //
     9  //     http://www.apache.org/licenses/LICENSE-2.0
    10  //
    11  // Unless required by applicable law or agreed to in writing,
    12  // software distributed under the License is distributed on an
    13  // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    14  // KIND, either express or implied.  See the License for the
    15  // specific language governing permissions and limitations
    16  // under the License.
    17  
    18  package apmcloudutil
    19  
    20  import (
    21  	"bytes"
    22  	"context"
    23  	"errors"
    24  	"fmt"
    25  	"net"
    26  	"net/http"
    27  	"strconv"
    28  	"testing"
    29  
    30  	"github.com/stretchr/testify/assert"
    31  
    32  	"github.com/waldiirawan/apm-agent-go/v2/model"
    33  )
    34  
    35  func TestAutoProviderAllFail(t *testing.T) {
    36  	var out model.Cloud
    37  	var logger testLogger
    38  	client := &http.Client{Transport: newTargetedRoundTripper("", "testing.invalid")}
    39  	assert.False(t, Auto.getCloudMetadata(context.Background(), client, &logger, &out))
    40  	assert.Zero(t, logger)
    41  }
    42  
    43  func TestNone(t *testing.T) {
    44  	type wrappedRoundTripper struct {
    45  		http.RoundTripper
    46  	}
    47  	var out model.Cloud
    48  	var logger testLogger
    49  	client := &http.Client{Transport: &wrappedRoundTripper{nil /*panics if called*/}}
    50  	assert.False(t, None.getCloudMetadata(context.Background(), client, &logger, &out))
    51  	assert.Zero(t, logger)
    52  }
    53  
    54  // newTargetedRoundTripper returns a net/http.RoundTripper which wraps net/http.DefaultTransport,
    55  // rewriting requests for host to be sent to target, and causing all other requests to fail.
    56  func newTargetedRoundTripper(host, target string) http.RoundTripper {
    57  	return &targetedRoundTripper{
    58  		Transport: http.DefaultTransport.(*http.Transport),
    59  		host:      host,
    60  		target:    target,
    61  	}
    62  }
    63  
    64  type targetedRoundTripper struct {
    65  	*http.Transport
    66  	host   string
    67  	target string
    68  }
    69  
    70  func (rt *targetedRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
    71  	if req.URL.Host != rt.host {
    72  		port, err := strconv.Atoi(req.URL.Port())
    73  		if err != nil {
    74  			port = 80
    75  		}
    76  		return nil, &net.OpError{
    77  			Op:   "dial",
    78  			Net:  "tcp",
    79  			Addr: &net.TCPAddr{IP: net.ParseIP(req.URL.Hostname()), Port: port},
    80  			Err:  errors.New("connect: no route to host"),
    81  		}
    82  	}
    83  	req.URL.Host = rt.target
    84  	return rt.Transport.RoundTrip(req)
    85  }
    86  
    87  type testLogger struct {
    88  	Logger // panic on unexpected method calls
    89  	buf    bytes.Buffer
    90  }
    91  
    92  func (tl *testLogger) Warningf(format string, args ...interface{}) {
    93  	fmt.Fprintf(&tl.buf, "[warning] "+format, args...)
    94  }