package image import ( "context" "strconv" "strings" "sync" "github.com/containers/image/v5/docker" "github.com/containers/image/v5/types" sysreg "github.com/containers/libpod/pkg/registries" "github.com/pkg/errors" "github.com/sirupsen/logrus" "golang.org/x/sync/semaphore" ) const ( descriptionTruncLength = 44 maxQueries = 25 maxParallelSearches = int64(6) ) // SearchResult is holding image-search related data. type SearchResult struct { // Index is the image index (e.g., "docker.io" or "quay.io") Index string // Name is the canoncical name of the image (e.g., "docker.io/library/alpine"). Name string // Description of the image. Description string // Stars is the number of stars of the image. Stars int // Official indicates if it's an official image. Official string // Automated indicates if the image was created by an automated build. Automated string } // SearchOptions are used to control the behaviour of SearchImages. type SearchOptions struct { // Filter allows to filter the results. Filter SearchFilter // Limit limits the number of queries per index (default: 25). Must be // greater than 0 to overwrite the default value. Limit int // NoTrunc avoids the output to be truncated. NoTrunc bool // Authfile is the path to the authentication file. Authfile string // InsecureSkipTLSVerify allows to skip TLS verification. InsecureSkipTLSVerify types.OptionalBool } // SearchFilter allows filtering the results of SearchImages. type SearchFilter struct { // Stars describes the minimal amount of starts of an image. Stars int // IsAutomated decides if only images from automated builds are displayed. IsAutomated types.OptionalBool // IsOfficial decides if only official images are displayed. IsOfficial types.OptionalBool } // SearchImages searches images based on term and the specified SearchOptions // in all registries. func SearchImages(term string, options SearchOptions) ([]SearchResult, error) { // Check if search term has a registry in it registry, err := sysreg.GetRegistry(term) if err != nil { return nil, errors.Wrapf(err, "error getting registry from %q", term) } if registry != "" { term = term[len(registry)+1:] } registries, err := getRegistries(registry) if err != nil { return nil, err } // searchOutputData is used as a return value for searching in parallel. type searchOutputData struct { data []SearchResult err error } // Let's follow Firefox by limiting parallel downloads to 6. sem := semaphore.NewWeighted(maxParallelSearches) wg := sync.WaitGroup{} wg.Add(len(registries)) data := make([]searchOutputData, len(registries)) searchImageInRegistryHelper := func(index int, registry string) { defer sem.Release(1) defer wg.Done() searchOutput := searchImageInRegistry(term, registry, options) data[index] = searchOutputData{data: searchOutput} } ctx := context.Background() for i := range registries { if err := sem.Acquire(ctx, 1); err != nil { return nil, err } go searchImageInRegistryHelper(i, registries[i]) } wg.Wait() results := []SearchResult{} for _, d := range data { if d.err != nil { return nil, d.err } results = append(results, d.data...) } return results, nil } // getRegistries returns the list of registries to search, depending on an optional registry specification func getRegistries(registry string) ([]string, error) { var registries []string if registry != "" { registries = append(registries, registry) } else { var err error registries, err = sysreg.GetRegistries() if err != nil { return nil, errors.Wrapf(err, "error getting registries to search") } } return registries, nil } func searchImageInRegistry(term string, registry string, options SearchOptions) []SearchResult { // Max number of queries by default is 25 limit := maxQueries if options.Limit > 0 { limit = options.Limit } sc := GetSystemContext("", options.Authfile, false) sc.DockerInsecureSkipTLSVerify = options.InsecureSkipTLSVerify // FIXME: Set this more globally. Probably no reason not to have it in // every types.SystemContext, and to compute the value just once in one // place. sc.SystemRegistriesConfPath = sysreg.SystemRegistriesConfPath() results, err := docker.SearchRegistry(context.TODO(), sc, registry, term, limit) if err != nil { logrus.Errorf("error searching registry %q: %v", registry, err) return []SearchResult{} } index := registry arr := strings.Split(registry, ".") if len(arr) > 2 { index = strings.Join(arr[len(arr)-2:], ".") } // limit is the number of results to output // if the total number of results is less than the limit, output all // if the limit has been set by the user, output those number of queries limit = maxQueries if len(results) < limit { limit = len(results) } if options.Limit != 0 { limit = len(results) if options.Limit < len(results) { limit = options.Limit } } paramsArr := []SearchResult{} for i := 0; i < limit; i++ { // Check whether query matches filters if !(options.Filter.matchesAutomatedFilter(results[i]) && options.Filter.matchesOfficialFilter(results[i]) && options.Filter.matchesStarFilter(results[i])) { continue } official := "" if results[i].IsOfficial { official = "[OK]" } automated := "" if results[i].IsAutomated { automated = "[OK]" } description := strings.Replace(results[i].Description, "\n", " ", -1) if len(description) > 44 && !options.NoTrunc { description = description[:descriptionTruncLength] + "..." } name := registry + "/" + results[i].Name if index == "docker.io" && !strings.Contains(results[i].Name, "/") { name = index + "/library/" + results[i].Name } params := SearchResult{ Index: index, Name: name, Description: description, Official: official, Automated: automated, Stars: results[i].StarCount, } paramsArr = append(paramsArr, params) } return paramsArr } // ParseSearchFilter turns the filter into a SearchFilter that can be used for // searching images. func ParseSearchFilter(filter []string) (*SearchFilter, error) { sFilter := new(SearchFilter) for _, f := range filter { arr := strings.Split(f, "=") switch arr[0] { case "stars": if len(arr) < 2 { return nil, errors.Errorf("invalid `stars` filter %q, should be stars=", filter) } stars, err := strconv.Atoi(arr[1]) if err != nil { return nil, errors.Wrapf(err, "incorrect value type for stars filter") } sFilter.Stars = stars case "is-automated": if len(arr) == 2 && arr[1] == "false" { sFilter.IsAutomated = types.OptionalBoolFalse } else { sFilter.IsAutomated = types.OptionalBoolTrue } case "is-official": if len(arr) == 2 && arr[1] == "false" { sFilter.IsOfficial = types.OptionalBoolFalse } else { sFilter.IsOfficial = types.OptionalBoolTrue } default: return nil, errors.Errorf("invalid filter type %q", f) } } return sFilter, nil } func (f *SearchFilter) matchesStarFilter(result docker.SearchResult) bool { return result.StarCount >= f.Stars } func (f *SearchFilter) matchesAutomatedFilter(result docker.SearchResult) bool { if f.IsAutomated != types.OptionalBoolUndefined { return result.IsAutomated == (f.IsAutomated == types.OptionalBoolTrue) } return true } func (f *SearchFilter) matchesOfficialFilter(result docker.SearchResult) bool { if f.IsOfficial != types.OptionalBoolUndefined { return result.IsOfficial == (f.IsOfficial == types.OptionalBoolTrue) } return true }