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moby--moby/registry/service.go
Yong Tang 92f10fe228 Add --limit option to docker search
This fix tries to address the issue raised in #23055.
Currently `docker search` result caps at 25 and there is
no way to allow getting more results (if exist).

This fix adds the flag `--limit` so that it is possible
to return more results from the `docker search`.

Related documentation has been updated.

Additional tests have been added to cover the changes.

This fix fixes #23055.

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
2016-06-02 19:12:20 -07:00

226 lines
7 KiB
Go

package registry
import (
"crypto/tls"
"fmt"
"net/http"
"net/url"
"strings"
"golang.org/x/net/context"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/reference"
"github.com/docker/engine-api/types"
registrytypes "github.com/docker/engine-api/types/registry"
)
const (
// DefaultSearchLimit is the default value for maximum number of returned search results.
DefaultSearchLimit = 25
)
// Service is the interface defining what a registry service should implement.
type Service interface {
Auth(ctx context.Context, authConfig *types.AuthConfig, userAgent string) (status, token string, err error)
LookupPullEndpoints(hostname string) (endpoints []APIEndpoint, err error)
LookupPushEndpoints(hostname string) (endpoints []APIEndpoint, err error)
ResolveRepository(name reference.Named) (*RepositoryInfo, error)
ResolveIndex(name string) (*registrytypes.IndexInfo, error)
Search(ctx context.Context, term string, limit int, authConfig *types.AuthConfig, userAgent string, headers map[string][]string) (*registrytypes.SearchResults, error)
ServiceConfig() *registrytypes.ServiceConfig
TLSConfig(hostname string) (*tls.Config, error)
}
// DefaultService is a registry service. It tracks configuration data such as a list
// of mirrors.
type DefaultService struct {
config *serviceConfig
}
// NewService returns a new instance of DefaultService ready to be
// installed into an engine.
func NewService(options ServiceOptions) *DefaultService {
return &DefaultService{
config: newServiceConfig(options),
}
}
// ServiceConfig returns the public registry service configuration.
func (s *DefaultService) ServiceConfig() *registrytypes.ServiceConfig {
return &s.config.ServiceConfig
}
// Auth contacts the public registry with the provided credentials,
// and returns OK if authentication was successful.
// It can be used to verify the validity of a client's credentials.
func (s *DefaultService) Auth(ctx context.Context, authConfig *types.AuthConfig, userAgent string) (status, token string, err error) {
// TODO Use ctx when searching for repositories
serverAddress := authConfig.ServerAddress
if serverAddress == "" {
serverAddress = IndexServer
}
if !strings.HasPrefix(serverAddress, "https://") && !strings.HasPrefix(serverAddress, "http://") {
serverAddress = "https://" + serverAddress
}
u, err := url.Parse(serverAddress)
if err != nil {
return "", "", fmt.Errorf("unable to parse server address: %v", err)
}
endpoints, err := s.LookupPushEndpoints(u.Host)
if err != nil {
return "", "", err
}
for _, endpoint := range endpoints {
login := loginV2
if endpoint.Version == APIVersion1 {
login = loginV1
}
status, token, err = login(authConfig, endpoint, userAgent)
if err == nil {
return
}
if fErr, ok := err.(fallbackError); ok {
err = fErr.err
logrus.Infof("Error logging in to %s endpoint, trying next endpoint: %v", endpoint.Version, err)
continue
}
return "", "", err
}
return "", "", err
}
// splitReposSearchTerm breaks a search term into an index name and remote name
func splitReposSearchTerm(reposName string) (string, string) {
nameParts := strings.SplitN(reposName, "/", 2)
var indexName, remoteName string
if len(nameParts) == 1 || (!strings.Contains(nameParts[0], ".") &&
!strings.Contains(nameParts[0], ":") && nameParts[0] != "localhost") {
// This is a Docker Index repos (ex: samalba/hipache or ubuntu)
// 'docker.io'
indexName = IndexName
remoteName = reposName
} else {
indexName = nameParts[0]
remoteName = nameParts[1]
}
return indexName, remoteName
}
// Search queries the public registry for images matching the specified
// search terms, and returns the results.
func (s *DefaultService) Search(ctx context.Context, term string, limit int, authConfig *types.AuthConfig, userAgent string, headers map[string][]string) (*registrytypes.SearchResults, error) {
// TODO Use ctx when searching for repositories
if err := validateNoScheme(term); err != nil {
return nil, err
}
indexName, remoteName := splitReposSearchTerm(term)
index, err := newIndexInfo(s.config, indexName)
if err != nil {
return nil, err
}
// *TODO: Search multiple indexes.
endpoint, err := NewV1Endpoint(index, userAgent, http.Header(headers))
if err != nil {
return nil, err
}
r, err := NewSession(endpoint.client, authConfig, endpoint)
if err != nil {
return nil, err
}
if index.Official {
localName := remoteName
if strings.HasPrefix(localName, "library/") {
// If pull "library/foo", it's stored locally under "foo"
localName = strings.SplitN(localName, "/", 2)[1]
}
return r.SearchRepositories(localName, limit)
}
return r.SearchRepositories(remoteName, limit)
}
// ResolveRepository splits a repository name into its components
// and configuration of the associated registry.
func (s *DefaultService) ResolveRepository(name reference.Named) (*RepositoryInfo, error) {
return newRepositoryInfo(s.config, name)
}
// ResolveIndex takes indexName and returns index info
func (s *DefaultService) ResolveIndex(name string) (*registrytypes.IndexInfo, error) {
return newIndexInfo(s.config, name)
}
// APIEndpoint represents a remote API endpoint
type APIEndpoint struct {
Mirror bool
URL *url.URL
Version APIVersion
Official bool
TrimHostname bool
TLSConfig *tls.Config
}
// ToV1Endpoint returns a V1 API endpoint based on the APIEndpoint
func (e APIEndpoint) ToV1Endpoint(userAgent string, metaHeaders http.Header) (*V1Endpoint, error) {
return newV1Endpoint(*e.URL, e.TLSConfig, userAgent, metaHeaders)
}
// TLSConfig constructs a client TLS configuration based on server defaults
func (s *DefaultService) TLSConfig(hostname string) (*tls.Config, error) {
return newTLSConfig(hostname, isSecureIndex(s.config, hostname))
}
func (s *DefaultService) tlsConfigForMirror(mirrorURL *url.URL) (*tls.Config, error) {
return s.TLSConfig(mirrorURL.Host)
}
// LookupPullEndpoints creates a list of endpoints to try to pull from, in order of preference.
// It gives preference to v2 endpoints over v1, mirrors over the actual
// registry, and HTTPS over plain HTTP.
func (s *DefaultService) LookupPullEndpoints(hostname string) (endpoints []APIEndpoint, err error) {
return s.lookupEndpoints(hostname)
}
// LookupPushEndpoints creates a list of endpoints to try to push to, in order of preference.
// It gives preference to v2 endpoints over v1, and HTTPS over plain HTTP.
// Mirrors are not included.
func (s *DefaultService) LookupPushEndpoints(hostname string) (endpoints []APIEndpoint, err error) {
allEndpoints, err := s.lookupEndpoints(hostname)
if err == nil {
for _, endpoint := range allEndpoints {
if !endpoint.Mirror {
endpoints = append(endpoints, endpoint)
}
}
}
return endpoints, err
}
func (s *DefaultService) lookupEndpoints(hostname string) (endpoints []APIEndpoint, err error) {
endpoints, err = s.lookupV2Endpoints(hostname)
if err != nil {
return nil, err
}
if s.config.V2Only {
return endpoints, nil
}
legacyEndpoints, err := s.lookupV1Endpoints(hostname)
if err != nil {
return nil, err
}
endpoints = append(endpoints, legacyEndpoints...)
return endpoints, nil
}