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Don't return empty errcode.Errors slices

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If this slice ends up empty after parsing the HTTP response body, it
means the body is not well-formed. We've probably encountered an error
message produced by something that uses a different JSON schema, or
an error that just happens to validate as JSON.

An empty errcode.Errors slice is not a very useful thing to return,
since its Error() output is just `<nil>`. Detect this case, and instend
return an UnexpectedHTTPResponseError.

Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>
This commit is contained in:
Aaron Lehmann 2016-03-14 10:06:30 -07:00
parent 1d5d54978a
commit c94c2a47a3
2 changed files with 34 additions and 4 deletions
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19
docs/client/errors_test.go
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@ -59,6 +59,21 @@ func TestHandleErrorResponseExpectedStatusCode400ValidBody(t *testing.T) {
}
}
func TestHandleErrorResponseExpectedStatusCode404EmptyErrorSlice(t *testing.T) {
json := `{"randomkey": "randomvalue"}`
response := &http.Response{
Status: "404 Not Found",
StatusCode: 404,
Body: nopCloser{bytes.NewBufferString(json)},
}
err := HandleErrorResponse(response)
expectedMsg := `error parsing HTTP response: no error details found in HTTP response body: "{\"randomkey\": \"randomvalue\"}"`
if !strings.Contains(err.Error(), expectedMsg) {
t.Errorf("Expected \"%s\", got: \"%s\"", expectedMsg, err.Error())
}
}
func TestHandleErrorResponseExpectedStatusCode404InvalidBody(t *testing.T) {
json := "{invalid json}"
response := &http.Response{
@ -68,7 +83,7 @@ func TestHandleErrorResponseExpectedStatusCode404InvalidBody(t *testing.T) {
}
err := HandleErrorResponse(response)
expectedMsg := "Error parsing HTTP response: invalid character 'i' looking for beginning of object key string: \"{invalid json}\""
expectedMsg := "error parsing HTTP response: invalid character 'i' looking for beginning of object key string: \"{invalid json}\""
if !strings.Contains(err.Error(), expectedMsg) {
t.Errorf("Expected \"%s\", got: \"%s\"", expectedMsg, err.Error())
}
@ -82,7 +97,7 @@ func TestHandleErrorResponseUnexpectedStatusCode501(t *testing.T) {
}
err := HandleErrorResponse(response)
expectedMsg := "Received unexpected HTTP status: 501 Not Implemented"
expectedMsg := "received unexpected HTTP status: 501 Not Implemented"
if !strings.Contains(err.Error(), expectedMsg) {
t.Errorf("Expected \"%s\", got: \"%s\"", expectedMsg, err.Error())
}