083ef6617b
Signed-off-by: Stefan Gehrig <stefan.gehrig.hn@googlemail.com>
Co-authored-by: Cory Snider <corhere@gmail.com>
(cherry picked from commit 0d27579fc7)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
108 lines
3.3 KiB
Go
108 lines
3.3 KiB
Go
package client // import "github.com/docker/docker/client"
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import (
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"bytes"
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"context"
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"encoding/json"
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"errors"
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"io"
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"net/url"
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"github.com/docker/docker/api/types/container"
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"github.com/docker/docker/api/types/versions"
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)
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const containerWaitErrorMsgLimit = 2 * 1024 /* Max: 2KiB */
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// ContainerWait waits until the specified container is in a certain state
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// indicated by the given condition, either "not-running" (default),
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// "next-exit", or "removed".
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//
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// If this client's API version is before 1.30, condition is ignored and
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// ContainerWait will return immediately with the two channels, as the server
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// will wait as if the condition were "not-running".
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//
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// If this client's API version is at least 1.30, ContainerWait blocks until
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// the request has been acknowledged by the server (with a response header),
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// then returns two channels on which the caller can wait for the exit status
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// of the container or an error if there was a problem either beginning the
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// wait request or in getting the response. This allows the caller to
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// synchronize ContainerWait with other calls, such as specifying a
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// "next-exit" condition before issuing a ContainerStart request.
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func (cli *Client) ContainerWait(ctx context.Context, containerID string, condition container.WaitCondition) (<-chan container.WaitResponse, <-chan error) {
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if versions.LessThan(cli.ClientVersion(), "1.30") {
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return cli.legacyContainerWait(ctx, containerID)
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}
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resultC := make(chan container.WaitResponse)
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errC := make(chan error, 1)
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query := url.Values{}
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if condition != "" {
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query.Set("condition", string(condition))
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}
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resp, err := cli.post(ctx, "/containers/"+containerID+"/wait", query, nil, nil)
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if err != nil {
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defer ensureReaderClosed(resp)
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errC <- err
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return resultC, errC
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}
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go func() {
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defer ensureReaderClosed(resp)
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body := resp.body
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responseText := bytes.NewBuffer(nil)
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stream := io.TeeReader(body, responseText)
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var res container.WaitResponse
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if err := json.NewDecoder(stream).Decode(&res); err != nil {
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// NOTE(nicks): The /wait API does not work well with HTTP proxies.
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// At any time, the proxy could cut off the response stream.
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//
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// But because the HTTP status has already been written, the proxy's
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// only option is to write a plaintext error message.
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//
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// If there's a JSON parsing error, read the real error message
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// off the body and send it to the client.
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if errors.As(err, new(*json.SyntaxError)) {
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_, _ = io.ReadAll(io.LimitReader(stream, containerWaitErrorMsgLimit))
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errC <- errors.New(responseText.String())
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} else {
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errC <- err
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}
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return
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}
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resultC <- res
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}()
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return resultC, errC
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}
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// legacyContainerWait returns immediately and doesn't have an option to wait
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// until the container is removed.
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func (cli *Client) legacyContainerWait(ctx context.Context, containerID string) (<-chan container.WaitResponse, <-chan error) {
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resultC := make(chan container.WaitResponse)
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errC := make(chan error)
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go func() {
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resp, err := cli.post(ctx, "/containers/"+containerID+"/wait", nil, nil, nil)
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if err != nil {
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errC <- err
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return
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}
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defer ensureReaderClosed(resp)
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var res container.WaitResponse
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if err := json.NewDecoder(resp.body).Decode(&res); err != nil {
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errC <- err
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return
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}
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resultC <- res
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}()
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return resultC, errC
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}
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