93 lines
3.3 KiB
Go
93 lines
3.3 KiB
Go
package updater
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import (
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"context"
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"fmt"
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"io"
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"github.com/docker/docker/api/types/swarm"
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"github.com/docker/docker/api/types/system"
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"github.com/shcizo/package-updater/internal/imageref"
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)
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// SwarmClient is the subset of the Docker SDK SwarmExecutor depends on.
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// Defined as an interface so tests can supply a fake.
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type SwarmClient interface {
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Info(ctx context.Context) (system.Info, error)
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ServiceInspectWithRaw(ctx context.Context, serviceID string, opts swarm.ServiceInspectOptions) (swarm.Service, []byte, error)
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ServiceUpdate(ctx context.Context, serviceID string, version swarm.Version, service swarm.ServiceSpec, opts swarm.ServiceUpdateOptions) (swarm.ServiceUpdateResponse, error)
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}
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// SwarmExecutor updates a Swarm service's image via the Docker API,
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// equivalent to `docker service update --image`.
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type SwarmExecutor struct {
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cli SwarmClient
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resolve *Resolver
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auth *RegistryAuth
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}
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// NewSwarmExecutor returns an executor that drives Swarm service updates
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// through the Docker API. auth may be nil (anonymous registry access).
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func NewSwarmExecutor(cli SwarmClient, resolve *Resolver, auth *RegistryAuth) *SwarmExecutor {
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return &SwarmExecutor{cli: cli, resolve: resolve, auth: auth}
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}
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// Execute checks that the local daemon is a manager of the job's cluster,
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// pins job.Ref to its current digest (a ref that has one is used as is) and
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// updates the service to it. The update is addressed by the ID and version of
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// the service that was inspected, so it changes exactly that object. Success
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// means the daemon accepted the new spec, not that the tasks have converged.
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// It returns the pinned ref.
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func (e *SwarmExecutor) Execute(ctx context.Context, job Job, out io.Writer) (string, error) {
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info, err := e.cli.Info(ctx)
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if err != nil {
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return "", fmt.Errorf("docker info: %w", err)
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}
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if !info.Swarm.ControlAvailable {
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return "", fmt.Errorf("refused: this agent's daemon is not a swarm manager")
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}
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actual := ""
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if info.Swarm.Cluster != nil {
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actual = info.Swarm.Cluster.ID
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}
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if actual != job.SwarmClusterID {
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return "", fmt.Errorf("refused: job is for swarm cluster %s, this daemon is in %s", job.SwarmClusterID, actual)
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}
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svc, _, err := e.cli.ServiceInspectWithRaw(ctx, job.SwarmService, swarm.ServiceInspectOptions{})
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if err != nil {
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return "", fmt.Errorf("inspect service %s: %w", job.SwarmService, err)
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}
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if svc.Spec.Name != job.SwarmService {
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return "", fmt.Errorf("inspect service %s: daemon returned service %q", job.SwarmService, svc.Spec.Name)
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}
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if svc.Spec.TaskTemplate.ContainerSpec == nil {
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return "", fmt.Errorf("service %s has no container spec", job.SwarmService)
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}
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pinned, err := e.resolve.Resolve(ctx, job.Ref)
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if err != nil {
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return "", err
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}
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fmt.Fprintln(out, resolveNote(job.Ref, pinned))
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spec := svc.Spec
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spec.TaskTemplate.ContainerSpec.Image = pinned
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opts := swarm.ServiceUpdateOptions{QueryRegistry: true}
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if enc := e.auth.For(imageref.Parse(job.Ref).Repo); enc != "" {
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opts.EncodedRegistryAuth = enc
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} else {
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opts.RegistryAuthFrom = swarm.RegistryAuthFromSpec
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}
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resp, err := e.cli.ServiceUpdate(ctx, svc.ID, svc.Version, spec, opts)
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if err != nil {
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return "", fmt.Errorf("update service %s: %w", job.SwarmService, err)
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}
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for _, w := range resp.Warnings {
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fmt.Fprintf(out, "warning: %s\n", w)
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}
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fmt.Fprintf(out, "service %s updated\n", job.SwarmService)
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return pinned, nil
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}
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