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client: Client.ServiceLogs: close reader on context cancellation

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Use a cancelReadCloser to automatically close the reader when the context
is cancelled. Consumers are still recommended to manually close the reader,
but the cancelReadCloser makes the Close idempotent.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This commit is contained in:
Sebastiaan van Stijn
2025-10-30 10:08:51 +01:00
parent c5aedacb4f
commit cc9969bfed
3 changed files with 24 additions and 42 deletions
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27
client/service_logs.go
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@@ -29,8 +29,14 @@ type ServiceLogsResult interface {
io.ReadCloser
}
// ServiceLogs returns the logs generated by a service in an [ServiceLogsResult].
// ServiceLogs returns the logs generated by a service in a [ServiceLogsResult].
// as an [io.ReadCloser]. Callers should close the stream.
//
// The underlying [io.ReadCloser] is automatically closed if the context is canceled,
func (cli *Client) ServiceLogs(ctx context.Context, serviceID string, options ServiceLogsOptions) (ServiceLogsResult, error) {
// TODO(thaJeztah): this function needs documentation about the format of ths stream (similar to for container logs)
// TODO(thaJeztah): migrate CLI utilities to the client where suitable; https://github.com/docker/cli/blob/v29.0.0-rc.1/cli/command/service/logs.go#L73-L348
serviceID, err := trimID("service", serviceID)
if err != nil {
return nil, err
@@ -71,30 +77,15 @@ func (cli *Client) ServiceLogs(ctx context.Context, serviceID string, options Se
return nil, err
}
return &serviceLogsResult{
body: resp.Body,
ReadCloser: newCancelReadCloser(ctx, resp.Body),
}, nil
}
type serviceLogsResult struct {
// body must be closed to avoid a resource leak
body io.ReadCloser
io.ReadCloser
}
var (
_ io.ReadCloser = (*serviceLogsResult)(nil)
_ ServiceLogsResult = (*serviceLogsResult)(nil)
)
func (r *serviceLogsResult) Read(p []byte) (int, error) {
if r == nil || r.body == nil {
return 0, io.EOF
}
return r.body.Read(p)
}
func (r *serviceLogsResult) Close() error {
if r == nil || r.body == nil {
return nil
}
return r.body.Close()
}