Use cache for github client

Signed-off-by: Gabriel Adrian Samfira <gsamfira@cloudbasesolutions.com>

cache/github_client.go

@@ -0,0 +1,47 @@
+package cache
+
+import (
+	"sync"
+
+	"github.com/cloudbase/garm/runner/common"
+)
+
+var ghClientCache *GithubClientCache
+
+type GithubClientCache struct {
+	mux sync.Mutex
+
+	cache map[string]common.GithubClient
+}
+
+func init() {
+	clientCache := &GithubClientCache{
+		cache: make(map[string]common.GithubClient),
+	}
+	ghClientCache = clientCache
+}
+
+func (g *GithubClientCache) SetClient(entityID string, client common.GithubClient) {
+	g.mux.Lock()
+	defer g.mux.Unlock()
+
+	g.cache[entityID] = client
+}
+
+func (g *GithubClientCache) GetClient(entityID string) (common.GithubClient, bool) {
+	g.mux.Lock()
+	defer g.mux.Unlock()
+
+	if client, ok := g.cache[entityID]; ok {
+		return client, true
+	}
+	return nil, false
+}
+
+func SetGithubClient(entityID string, client common.GithubClient) {
+	ghClientCache.SetClient(entityID, client)
+}
+
+func GetGithubClient(entityID string) (common.GithubClient, bool) {
+	return ghClientCache.GetClient(entityID)
+}