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12 commits

Author SHA1 Message Date
Zhang Wei
a0191a2341 Remove WaitRunning
Remove function `WaitRunning` because it's actually not necessary, also
remove wait channel for state "running" to avoid mixed use of the state
wait channel.

Signed-off-by: Zhang Wei <zhangwei555@huawei.com>
2016-04-27 11:36:47 +08:00
Tonis Tiigi
9c4570a958 Replace execdrivers with containerd implementation
Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
Signed-off-by: Kenfe-Mickael Laventure <mickael.laventure@gmail.com>
Signed-off-by: Anusha Ragunathan <anusha@docker.com>
2016-03-18 13:38:32 -07:00
Antonio Murdaca
bb05c18892 daemon: update: check len inside public function
Signed-off-by: Antonio Murdaca <runcom@redhat.com>
2016-03-15 17:24:25 +01:00
David Calavera
a793564b25 Remove static errors from errors package.
Moving all strings to the errors package wasn't a good idea after all.

Our custom implementation of Go errors predates everything that's nice
and good about working with errors in Go. Take as an example what we
have to do to get an error message:

```go
func GetErrorMessage(err error) string {
	switch err.(type) {
	case errcode.Error:
		e, _ := err.(errcode.Error)
		return e.Message

	case errcode.ErrorCode:
		ec, _ := err.(errcode.ErrorCode)
		return ec.Message()

	default:
		return err.Error()
	}
}
```

This goes against every good practice for Go development. The language already provides a simple, intuitive and standard way to get error messages, that is calling the `Error()` method from an error. Reinventing the error interface is a mistake.

Our custom implementation also makes very hard to reason about errors, another nice thing about Go. I found several (>10) error declarations that we don't use anywhere. This is a clear sign about how little we know about the errors we return. I also found several error usages where the number of arguments was different than the parameters declared in the error, another clear example of how difficult is to reason about errors.

Moreover, our custom implementation didn't really make easier for people to return custom HTTP status code depending on the errors. Again, it's hard to reason about when to set custom codes and how. Take an example what we have to do to extract the message and status code from an error before returning a response from the API:

```go
	switch err.(type) {
	case errcode.ErrorCode:
		daError, _ := err.(errcode.ErrorCode)
		statusCode = daError.Descriptor().HTTPStatusCode
		errMsg = daError.Message()

	case errcode.Error:
		// For reference, if you're looking for a particular error
		// then you can do something like :
		//   import ( derr "github.com/docker/docker/errors" )
		//   if daError.ErrorCode() == derr.ErrorCodeNoSuchContainer { ... }

		daError, _ := err.(errcode.Error)
		statusCode = daError.ErrorCode().Descriptor().HTTPStatusCode
		errMsg = daError.Message

	default:
		// This part of will be removed once we've
		// converted everything over to use the errcode package

		// FIXME: this is brittle and should not be necessary.
		// If we need to differentiate between different possible error types,
		// we should create appropriate error types with clearly defined meaning
		errStr := strings.ToLower(err.Error())
		for keyword, status := range map[string]int{
			"not found":             http.StatusNotFound,
			"no such":               http.StatusNotFound,
			"bad parameter":         http.StatusBadRequest,
			"conflict":              http.StatusConflict,
			"impossible":            http.StatusNotAcceptable,
			"wrong login/password":  http.StatusUnauthorized,
			"hasn't been activated": http.StatusForbidden,
		} {
			if strings.Contains(errStr, keyword) {
				statusCode = status
				break
			}
		}
	}
```

You can notice two things in that code:

1. We have to explain how errors work, because our implementation goes against how easy to use Go errors are.
2. At no moment we arrived to remove that `switch` statement that was the original reason to use our custom implementation.

This change removes all our status errors from the errors package and puts them back in their specific contexts.
IT puts the messages back with their contexts. That way, we know right away when errors used and how to generate their messages.
It uses custom interfaces to reason about errors. Errors that need to response with a custom status code MUST implementent this simple interface:

```go
type errorWithStatus interface {
	HTTPErrorStatusCode() int
}
```

This interface is very straightforward to implement. It also preserves Go errors real behavior, getting the message is as simple as using the `Error()` method.

I included helper functions to generate errors that use custom status code in `errors/errors.go`.

By doing this, we remove the hard dependency we have eeverywhere to our custom errors package. Yes, you can use it as a helper to generate error, but it's still very easy to generate errors without it.

Please, read this fantastic blog post about errors in Go: http://dave.cheney.net/2014/12/24/inspecting-errors

Signed-off-by: David Calavera <david.calavera@gmail.com>
2016-02-26 15:49:09 -05:00
Qiang Huang
fa3b197157 Restore container configs when update failed
Signed-off-by: Qiang Huang <h.huangqiang@huawei.com>
2016-02-24 14:23:48 +08:00
Qiang Huang
8ae6f6ac28 Support update swap memory only
We should support update swap memory without memory.

Signed-off-by: Qiang Huang <h.huangqiang@huawei.com>
2016-02-24 13:36:47 +08:00
Zhang Wei
ff3ea4c90f Update RestartPolicy of container
Add `--restart` flag for `update` command, so we can change restart
policy for a container no matter it's running or stopped.

Signed-off-by: Zhang Wei <zhangwei555@huawei.com>
2016-02-20 17:06:32 +08:00
Zhang Wei
894266c1bb Remove redundant error message
Currently some commands including `kill`, `pause`, `restart`, `rm`,
`rmi`, `stop`, `unpause`, `udpate`, `wait` will print a lot of error
message on client side, with a lot of redundant messages, this commit is
trying to remove the unuseful and redundant information for user.

Signed-off-by: Zhang Wei <zhangwei555@huawei.com>
2016-02-03 15:45:20 +08:00
Anusha Ragunathan
9c332b164f Remove package daemonbuilder.
Currently, daemonbuilder package (part of daemon) implemented the
builder backend. However, it was a very thin wrapper around daemon
methods and caused an implementation dependency for api/server build
endpoint. api/server buildrouter should only know about the backend
implementing the /build API endpoint.

Removing daemonbuilder involved moving build specific methods to
respective files in the daemon, where they fit naturally.

Signed-off-by: Anusha Ragunathan <anusha@docker.com>
2016-02-01 09:57:38 -08:00
David Calavera
907407d0b2 Modify import paths to point to the new engine-api package.
Signed-off-by: David Calavera <david.calavera@gmail.com>
2016-01-06 19:48:59 -05:00
David Calavera
72f1881df1 Add event types.
- Stop serializing JSONMessage in favor of events.Message.
- Keep backwards compatibility with JSONMessage for container events.

Signed-off-by: David Calavera <david.calavera@gmail.com>
2015-12-30 17:39:33 -05:00
Qiang Huang
8799c4fc0f Implemet docker update command
It's used for updating properties of one or more containers, we only
support resource configs for now. It can be extended in the future.

Signed-off-by: Qiang Huang <h.huangqiang@huawei.com>
2015-12-28 19:19:26 +08:00