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package correlation
import (
"context"
"errors"
"net/http"
"testing"
"github.com/stretchr/testify/require"
)
var httpCorrelationTests = []struct {
name string
ctx context.Context
correlationID string
clientName string
hasHeader bool
}{
{
name: "context with value",
ctx: context.Background(),
correlationID: "CORRELATION_ID",
clientName: "test_client",
hasHeader: true,
},
{
name: "context without value",
ctx: context.Background(),
correlationID: "",
clientName: "",
hasHeader: false,
},
}
func Test_injectRequest(t *testing.T) {
for _, tt := range httpCorrelationTests {
t.Run(tt.name, func(t *testing.T) {
require := require.New(t)
ctx := context.WithValue(tt.ctx, keyCorrelationID, tt.correlationID)
req, err := http.NewRequest("GET", "http://example.com", nil)
require.NoError(err)
req = req.WithContext(ctx)
mockTransport := roundTripperFunc(func(req *http.Request) (*http.Response, error) {
return &http.Response{}, nil
})
roundTripper := NewInstrumentedRoundTripper(mockTransport, WithClientName(tt.clientName))
roundTripper.(*instrumentedRoundTripper).injectRequest(req)
value := req.Header.Get(propagationHeader)
clientName := req.Header.Get(clientNameHeader)
require.True(tt.hasHeader == (value != ""), "Expected header existence %v. Instead got header %v", tt.hasHeader, value)
require.Equal(tt.clientName, clientName, "Expected client name value %v, got %v", tt.clientName, clientName)
if tt.hasHeader {
require.Equal(tt.correlationID, value, "Expected header value %v, got %v", tt.correlationID, value)
}
})
}
}
type delegatedRoundTripper struct {
delegate func(req *http.Request) (*http.Response, error)
}
func (c delegatedRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
return c.delegate(req)
}
func roundTripperFunc(delegate func(req *http.Request) (*http.Response, error)) http.RoundTripper {
return &delegatedRoundTripper{delegate}
}
func TestInstrumentedRoundTripper(t *testing.T) {
for _, tt := range httpCorrelationTests {
t.Run(tt.name, func(t *testing.T) {
require := require.New(t)
response := &http.Response{}
mockTransport := roundTripperFunc(func(req *http.Request) (*http.Response, error) {
value := req.Header.Get(propagationHeader)
require.True(tt.hasHeader == (value != ""), "Expected header existence %v. Instead got header %v", tt.hasHeader, value)
if tt.hasHeader {
require.Equal(tt.correlationID, value, "Expected header value %v, got %v", tt.correlationID, value)
}
return response, nil
})
client := &http.Client{
Transport: NewInstrumentedRoundTripper(mockTransport),
}
ctx := context.WithValue(tt.ctx, keyCorrelationID, tt.correlationID)
req, err := http.NewRequest("GET", "http://example.com", nil)
require.NoError(err)
req = req.WithContext(ctx)
res, err := client.Do(req)
require.NoError(err)
require.Equal(response, res)
})
}
}
func TestInstrumentedRoundTripperFailures(t *testing.T) {
for _, tt := range httpCorrelationTests {
t.Run(tt.name+" - with errors", func(t *testing.T) {
require := require.New(t)
testErr := errors.New("test")
mockTransport := roundTripperFunc(func(req *http.Request) (*http.Response, error) {
value := req.Header.Get(propagationHeader)
require.True(tt.hasHeader == (value != ""), "Expected header existence %v. Instead got header %v", tt.hasHeader, value)
if tt.hasHeader {
require.Equal(tt.correlationID, value, "Expected header value %v, got %v", tt.correlationID, value)
}
return nil, testErr
})
client := &http.Client{
Transport: NewInstrumentedRoundTripper(mockTransport),
}
ctx := context.WithValue(tt.ctx, keyCorrelationID, tt.correlationID)
req, err := http.NewRequest("GET", "http://example.com", nil)
require.NoError(err)
req = req.WithContext(ctx)
res, err := client.Do(req)
require.Error(err)
require.Nil(res)
})
}
}
func TestInstrumentedRoundTripperWithoutContext(t *testing.T) {
require := require.New(t)
response := &http.Response{}
mockTransport := roundTripperFunc(func(req *http.Request) (*http.Response, error) {
return response, nil
})
client := &http.Client{
Transport: NewInstrumentedRoundTripper(mockTransport),
}
req, err := http.NewRequest("GET", "http://example.com", nil)
require.NoError(err)
res, err := client.Do(req)
require.NoError(err)
require.Equal(response, res)
}
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