Refactor into package structure

internal/pkg/registry/client.go

@@ -0,0 +1,60 @@
+package registry
+
+import (
+	"fmt"
+
+	l "hulthe.net/lookbuilding/internal/pkg/logging"
+	"hulthe.net/lookbuilding/internal/pkg/semver"
+
+	"github.com/heroku/docker-registry-client/registry"
+	"github.com/opencontainers/go-digest"
+)
+
+type Tag struct {
+	Name   string
+	SemVer *semver.Tag
+	repository string
+	cache  cache
+}
+
+type Client struct {
+	cache cache
+}
+
+func (tag Tag) GetDigest() (digest.Digest, error) {
+	responseCh := make(chan digestResp)
+	tag.cache.DigestReq <- digestReq{ tag.repository, tag.Name, responseCh	}
+	resp := <-responseCh
+	return resp.Data, resp.Error
+}
+
+func (client Client) GetRepoTags(maybeOwner *string, repository string) ([]Tag, error) {
+	if maybeOwner != nil {
+		repository = fmt.Sprintf("%s/%s", *maybeOwner, repository)
+	}
+
+	responseCh := make(chan tagListResp)
+	client.cache.TagListReq <- tagListReq { repository, responseCh }
+	resp := <-responseCh
+
+	return resp.Data, resp.Error
+}
+
+func AnonymousClient() (*Client, error) {
+	url := "https://registry-1.docker.io/"
+	username := "" // anonymous
+	password := "" // anonymous
+
+	registry, err := registry.New(url, username, password)
+	if err != nil {
+		return nil, err
+	}
+
+	registry.Logf = l.Logger.Infof
+
+	client := Client{
+		cache: newCache(*registry),
+	}
+
+	return &client, nil
+}