This reverts the changes made in 2a9c987e5a, which
moved the GetHTTPErrorStatusCode() utility to the errdefs package.
While it seemed to make sense at the time to have the errdefs package provide
conversion both from HTTP status codes errdefs and the reverse, a side-effect
of the move was that the errdefs package now had a dependency on various external
modules, to handle conversio of errors coming from those sub-systems, such as;
- github.com/containerd/containerd
- github.com/docker/distribution
- google.golang.org/grpc
This patch moves the conversion from (errdef-) errors to HTTP status-codes to a
api/server/httpstatus package, which is only used by the API server, and should
not be needed by client-code using the errdefs package.
The MakeErrorHandler() utility was moved to the API server itself, as that's the
only place it's used. While the same applies to the GetHTTPErrorStatusCode func,
I opted for keeping that in its own package for a slightly cleaner interface.
Why not move it into the api/server/httputils package?
The api/server/httputils package is also imported in the client package, which
uses the httputils.ParseForm() and httputils.HijackConnection() functions as
part of the TestTLSCloseWriter() test. While this is only used in tests, I
wanted to avoid introducing the indirect depdencencies outside of the api/server
code.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
In situations where the containerd error is consumed directly
and not received over gRPC, errors were not translated.
This patch converts containerd errors to the correct HTTP
status code.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
The `statusCodeFromGRPCError` and `statusCodeFromDistributionError`
helpers are used by `GetHTTPErrorStatusCode`, which already recurses
if the error implements the `Causer` interface.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
The `ErrAlreadyExists` error is used for 304 statuses, which
is not an error-condition, so should probably not be defined
as part of the errdefs package.
This patch removes the `ErrAlreadyExists` interface, and related
helpers, as it was currently not used.
Note that a 304 status can fulfil certain use-cases, but (refering
to https://www.codetinkerer.com/2015/12/04/choosing-an-http-status-code.html)
could probably be handled by a 200 OK, unless we want to perform
caching in the client.
If we do want to use 304 statuses, perhaps we need a separate class
of "errors" for this (?).
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
The types defined in the errdefs package do not
satisfy the `error` interface, because they do not
implement `Error()`.
Instead of returning the matched interface, return
the original error.
When matching _multiple_ interfaces/types, Golang doesn't complain:
func getImplementer(err error) error {
switch e := err.(type) {
case
ErrNotFound,
ErrInvalidParameter:
return e
default:
return err
}
}
But matching a single interface/type:
func getImplementer(err error) error {
switch e := err.(type) {
case
ErrNotFound:
return e
default:
return err
}
}
Produces an error:
cannot use e (type ErrNotFound) as type error in return argument: ErrNotFound does not implement error (missing Error method)
Return the original `err` instead of the matched interface/type instead.
Also added some additional tests
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
