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moby--moby/client/service_create.go
Nishant Totla 5efcec7717
Ensure service images get default tag and print familiar strings
Signed-off-by: Nishant Totla <nishanttotla@gmail.com>
2017-05-19 10:35:34 -07:00

110 lines
4 KiB
Go

package client
import (
"encoding/json"
"fmt"
"github.com/docker/distribution/reference"
"github.com/docker/docker/api/types"
registrytypes "github.com/docker/docker/api/types/registry"
"github.com/docker/docker/api/types/swarm"
"github.com/opencontainers/go-digest"
"golang.org/x/net/context"
)
// ServiceCreate creates a new Service.
func (cli *Client) ServiceCreate(ctx context.Context, service swarm.ServiceSpec, options types.ServiceCreateOptions) (types.ServiceCreateResponse, error) {
var distErr error
headers := map[string][]string{
"version": {cli.version},
}
if options.EncodedRegistryAuth != "" {
headers["X-Registry-Auth"] = []string{options.EncodedRegistryAuth}
}
// ensure that the image is tagged
if taggedImg := imageWithTagString(service.TaskTemplate.ContainerSpec.Image); taggedImg != "" {
service.TaskTemplate.ContainerSpec.Image = taggedImg
}
// Contact the registry to retrieve digest and platform information
if options.QueryRegistry {
distributionInspect, err := cli.DistributionInspect(ctx, service.TaskTemplate.ContainerSpec.Image, options.EncodedRegistryAuth)
distErr = err
if err == nil {
// now pin by digest if the image doesn't already contain a digest
if img := imageWithDigestString(service.TaskTemplate.ContainerSpec.Image, distributionInspect.Descriptor.Digest); img != "" {
service.TaskTemplate.ContainerSpec.Image = img
}
// add platforms that are compatible with the service
service.TaskTemplate.Placement = updateServicePlatforms(service.TaskTemplate.Placement, distributionInspect)
}
}
var response types.ServiceCreateResponse
resp, err := cli.post(ctx, "/services/create", nil, service, headers)
if err != nil {
return response, err
}
err = json.NewDecoder(resp.body).Decode(&response)
if distErr != nil {
response.Warnings = append(response.Warnings, digestWarning(service.TaskTemplate.ContainerSpec.Image))
}
ensureReaderClosed(resp)
return response, err
}
// imageWithDigestString takes an image string and a digest, and updates
// the image string if it didn't originally contain a digest. It returns
// an empty string if there are no updates.
func imageWithDigestString(image string, dgst digest.Digest) string {
namedRef, err := reference.ParseNormalizedNamed(image)
if err == nil {
if _, isCanonical := namedRef.(reference.Canonical); !isCanonical {
// ensure that image gets a default tag if none is provided
img, err := reference.WithDigest(namedRef, dgst)
if err == nil {
return reference.FamiliarString(img)
}
}
}
return ""
}
// imageWithTagString takes an image string, and returns a tagged image
// string, adding a 'latest' tag if one was not provided. It returns an
// emptry string if a canonical reference was provided
func imageWithTagString(image string) string {
namedRef, err := reference.ParseNormalizedNamed(image)
if err == nil {
return reference.FamiliarString(reference.TagNameOnly(namedRef))
}
return ""
}
// updateServicePlatforms updates the Platforms in swarm.Placement to list
// all compatible platforms for the service, as found in distributionInspect
// and returns a pointer to the new or updated swarm.Placement struct
func updateServicePlatforms(placement *swarm.Placement, distributionInspect registrytypes.DistributionInspect) *swarm.Placement {
if placement == nil {
placement = &swarm.Placement{}
}
for _, p := range distributionInspect.Platforms {
placement.Platforms = append(placement.Platforms, swarm.Platform{
Architecture: p.Architecture,
OS: p.OS,
})
}
return placement
}
// digestWarning constructs a formatted warning string using the
// image name that could not be pinned by digest. The formatting
// is hardcoded, but could me made smarter in the future
func digestWarning(image string) string {
return fmt.Sprintf("image %s could not be accessed on a registry to record\nits digest. Each node will access %s independently,\npossibly leading to different nodes running different\nversions of the image.\n", image, image)
}