func fromSystemError(err tchannel.SystemError) error {
switch err.Code() {
case tchannel.ErrCodeCancelled, tchannel.ErrCodeBusy, tchannel.ErrCodeBadRequest:
return errors.RemoteBadRequestError(err.Message())
case tchannel.ErrCodeTimeout:
return errors.RemoteTimeoutError(err.Message())
default:
return errors.RemoteUnexpectedError(err.Message())
}
}
func getErrFromResponse(response *http.Response) error {
// TODO Behavior for 300-range status codes is undefined
contents, err := ioutil.ReadAll(response.Body)
if err != nil {
return err
}
if err := response.Body.Close(); err != nil {
return err
}
// Trim the trailing newline from HTTP error messages
message := strings.TrimSuffix(string(contents), "\n")
if response.StatusCode >= 400 && response.StatusCode < 500 {
return errors.RemoteBadRequestError(message)
}
if response.StatusCode == http.StatusGatewayTimeout {
return errors.RemoteTimeoutError(message)
}
return errors.RemoteUnexpectedError(message)
}
func TestSimpleRoundTrip(t *testing.T) {
transports := []roundTripTransport{
httpTransport{t},
tchannelTransport{t},
}
tests := []struct {
requestHeaders transport.Headers
requestBody string
responseHeaders transport.Headers
responseBody string
responseError error
wantError func(error)
}{
{
requestHeaders: transport.NewHeaders().With("token", "1234"),
requestBody: "world",
responseHeaders: transport.NewHeaders().With("status", "ok"),
responseBody: "hello, world",
},
{
requestBody: "foo",
responseError: errors.HandlerUnexpectedError(fmt.Errorf("great sadness")),
wantError: func(err error) {
assert.True(t, transport.IsUnexpectedError(err), err)
assert.Equal(t, "UnexpectedError: great sadness", err.Error())
},
},
{
requestBody: "bar",
responseError: errors.HandlerBadRequestError(fmt.Errorf("missing service name")),
wantError: func(err error) {
assert.True(t, transport.IsBadRequestError(err))
assert.Equal(t, "BadRequest: missing service name", err.Error())
},
},
{
requestBody: "baz",
responseError: errors.RemoteUnexpectedError(
`UnexpectedError: error for procedure "foo" of service "bar": great sadness`,
),
wantError: func(err error) {
assert.True(t, transport.IsUnexpectedError(err))
assert.Equal(t,
`UnexpectedError: error for procedure "hello" of service "testService": `+
`UnexpectedError: error for procedure "foo" of service "bar": great sadness`,
err.Error())
},
},
{
requestBody: "qux",
responseError: errors.RemoteBadRequestError(
`BadRequest: unrecognized procedure "echo" for service "derp"`,
),
wantError: func(err error) {
assert.True(t, transport.IsUnexpectedError(err))
assert.Equal(t,
`UnexpectedError: error for procedure "hello" of service "testService": `+
`BadRequest: unrecognized procedure "echo" for service "derp"`,
err.Error())
},
},
}
rootCtx := context.Background()
for _, tt := range tests {
for _, trans := range transports {
requestMatcher := transporttest.NewRequestMatcher(t, &transport.Request{
Caller: testCaller,
Service: testService,
Procedure: testProcedure,
Encoding: raw.Encoding,
Headers: tt.requestHeaders,
Body: bytes.NewReader([]byte(tt.requestBody)),
})
handler := unaryHandlerFunc(func(_ context.Context, r *transport.Request, w transport.ResponseWriter) error {
assert.True(t, requestMatcher.Matches(r), "request mismatch: received %v", r)
if tt.responseError != nil {
return tt.responseError
}
if tt.responseHeaders.Len() > 0 {
w.AddHeaders(tt.responseHeaders)
}
_, err := w.Write([]byte(tt.responseBody))
assert.NoError(t, err, "failed to write response for %v", r)
return err
})
ctx, cancel := context.WithTimeout(rootCtx, 200*time.Millisecond)
defer cancel()
registry := staticRegistry{Handler: handler}
trans.WithRegistry(registry, func(o transport.UnaryOutbound) {
res, err := o.Call(ctx, &transport.Request{
Caller: testCaller,
Service: testService,
Procedure: testProcedure,
Encoding: raw.Encoding,
Headers: tt.requestHeaders,
Body: bytes.NewReader([]byte(tt.requestBody)),
})
if tt.wantError != nil {
if assert.Error(t, err, "%T: expected error, got %v", trans, res) {
tt.wantError(err)
// none of the errors returned by Call can be valid
// Handler errors.
_, ok := err.(errors.HandlerError)
assert.False(t, ok, "%T: %T must not be a HandlerError", trans, err)
}
} else {
responseMatcher := transporttest.NewResponseMatcher(t, &transport.Response{
Headers: tt.responseHeaders,
Body: ioutil.NopCloser(bytes.NewReader([]byte(tt.responseBody))),
})
if assert.NoError(t, err, "%T: call failed", trans) {
assert.True(t, responseMatcher.Matches(res), "%T: response mismatch", trans)
}
}
})
}
}
}