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The containerd client is very chatty at the best of times. Because the libcontained API is stateless and references containers and processes by string ID for every method call, the implementation is essentially forced to use the containerd client in a way which amplifies the number of redundant RPCs invoked to perform any operation. The libcontainerd remote implementation has to reload the containerd container, task and/or process metadata for nearly every operation. This in turn amplifies the number of context switches between dockerd and containerd to perform any container operation or handle a containerd event, increasing the load on the system which could otherwise be allocated to workloads. Overhaul the libcontainerd interface to reduce the impedance mismatch with the containerd client so that the containerd client can be used more efficiently. Split the API out into container, task and process interfaces which the consumer is expected to retain so that libcontainerd can retain state---especially the analogous containerd client objects---without having to manage any state-store inside the libcontainerd client. Signed-off-by: Cory Snider <csnider@mirantis.com>
131 lines
3.1 KiB
Go
131 lines
3.1 KiB
Go
package container // import "github.com/docker/docker/container"
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import (
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"runtime"
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"sync"
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"github.com/containerd/containerd/cio"
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"github.com/docker/docker/container/stream"
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"github.com/docker/docker/libcontainerd/types"
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"github.com/docker/docker/pkg/stringid"
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"github.com/sirupsen/logrus"
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)
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// ExecConfig holds the configurations for execs. The Daemon keeps
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// track of both running and finished execs so that they can be
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// examined both during and after completion.
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type ExecConfig struct {
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sync.Mutex
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Started chan struct{}
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StreamConfig *stream.Config
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ID string
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Running bool
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ExitCode *int
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OpenStdin bool
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OpenStderr bool
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OpenStdout bool
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CanRemove bool
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Container *Container
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DetachKeys []byte
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Entrypoint string
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Args []string
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Tty bool
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Privileged bool
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User string
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WorkingDir string
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Env []string
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Process types.Process
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ConsoleSize *[2]uint
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}
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// NewExecConfig initializes the a new exec configuration
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func NewExecConfig(c *Container) *ExecConfig {
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return &ExecConfig{
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ID: stringid.GenerateRandomID(),
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Container: c,
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StreamConfig: stream.NewConfig(),
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Started: make(chan struct{}),
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}
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}
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// InitializeStdio is called by libcontainerd to connect the stdio.
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func (c *ExecConfig) InitializeStdio(iop *cio.DirectIO) (cio.IO, error) {
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c.StreamConfig.CopyToPipe(iop)
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if c.StreamConfig.Stdin() == nil && !c.Tty && runtime.GOOS == "windows" {
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if iop.Stdin != nil {
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if err := iop.Stdin.Close(); err != nil {
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logrus.Errorf("error closing exec stdin: %+v", err)
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}
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}
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}
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return &rio{IO: iop, sc: c.StreamConfig}, nil
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}
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// CloseStreams closes the stdio streams for the exec
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func (c *ExecConfig) CloseStreams() error {
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return c.StreamConfig.CloseStreams()
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}
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// SetExitCode sets the exec config's exit code
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func (c *ExecConfig) SetExitCode(code int) {
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c.ExitCode = &code
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}
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// ExecStore keeps track of the exec configurations.
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type ExecStore struct {
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byID map[string]*ExecConfig
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mu sync.RWMutex
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}
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// NewExecStore initializes a new exec store.
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func NewExecStore() *ExecStore {
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return &ExecStore{
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byID: make(map[string]*ExecConfig),
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}
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}
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// Commands returns the exec configurations in the store.
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func (e *ExecStore) Commands() map[string]*ExecConfig {
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e.mu.RLock()
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byID := make(map[string]*ExecConfig, len(e.byID))
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for id, config := range e.byID {
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byID[id] = config
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}
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e.mu.RUnlock()
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return byID
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}
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// Add adds a new exec configuration to the store.
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func (e *ExecStore) Add(id string, Config *ExecConfig) {
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e.mu.Lock()
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e.byID[id] = Config
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e.mu.Unlock()
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}
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// Get returns an exec configuration by its id.
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func (e *ExecStore) Get(id string) *ExecConfig {
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e.mu.RLock()
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res := e.byID[id]
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e.mu.RUnlock()
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return res
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}
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// Delete removes an exec configuration from the store.
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func (e *ExecStore) Delete(id string) {
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e.mu.Lock()
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delete(e.byID, id)
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e.mu.Unlock()
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}
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// List returns the list of exec ids in the store.
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func (e *ExecStore) List() []string {
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var IDs []string
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e.mu.RLock()
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for id := range e.byID {
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IDs = append(IDs, id)
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}
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e.mu.RUnlock()
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return IDs
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}
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