Add caching for GitHub App tokens

Signed-off-by: Matheus Pimenta <[email protected]>

auth/github/client.go

@@ -18,14 +18,18 @@ package github
 
 import (
 	"context"
+	"crypto/sha256"
 	"fmt"
 	"net/http"
 	"net/url"
 	"strconv"
+	"strings"
 	"time"
 
 	"github.com/bradleyfalzon/ghinstallation/v2"
 	"golang.org/x/net/http/httpproxy"
+
+	"github.com/fluxcd/pkg/cache"
 )
 
 const (
@@ -43,6 +47,10 @@ type Client struct {
 	apiURL         string
 	proxyURL       *url.URL
 	ghTransport    *ghinstallation.Transport
+	cache          *cache.TokenCache
+	kind           string
+	name           string
+	namespace      string
 }
 
 // OptFunc enables specifying options for the provider.
@@ -158,16 +166,46 @@ func WithProxyURL(proxyURL *url.URL) OptFunc {
 	}
 }
 
+// WithCache sets the token cache and the object involved in the operation for
+// recording cache events.
+func WithCache(cache *cache.TokenCache, kind, name, namespace string) OptFunc {
+	return func(p *Client) {
+		p.cache = cache
+		p.kind = kind
+		p.name = name
+		p.namespace = namespace
+	}
+}
+
 // AppToken contains a GitHub App installation token and its expiry.
 type AppToken struct {
 	Token     string    `json:"token"`
 	ExpiresAt time.Time `json:"expires_at"`
 }
 
+// GetDuration returns the duration until the token expires.
+func (at *AppToken) GetDuration() time.Duration {
+	return time.Until(at.ExpiresAt)
+}
+
 // GetToken returns the token that can be used to authenticate
 // as a GitHub App installation.
 // Ref: https://docs.github.com/en/apps/creating-github-apps/authenticating-with-a-github-app/authenticating-as-a-github-app-installation
 func (p *Client) GetToken(ctx context.Context) (*AppToken, error) {
+	cacheKey := p.buildCacheKey()
+	if p.cache != nil {
+		hasInvolvedObject := p.kind != "" && p.name != "" && p.namespace != ""
+		if token := p.cache.Get(cacheKey); token != nil {
+			if hasInvolvedObject {
+				p.cache.RecordCacheEvent(cache.CacheEventTypeHit, p.kind, p.name, p.namespace)
+			}
+			return token.(*AppToken), nil
+		}
+		if hasInvolvedObject {
+			p.cache.RecordCacheEvent(cache.CacheEventTypeMiss, p.kind, p.name, p.namespace)
+		}
+	}
+
 	token, err := p.ghTransport.Token(ctx)
 	if err != nil {
 		return nil, err
@@ -178,8 +216,25 @@ func (p *Client) GetToken(ctx context.Context) (*AppToken, error) {
 		return nil, err
 	}
 
-	return &AppToken{
+	at := &AppToken{
 		Token:     token,
 		ExpiresAt: expiresAt,
-	}, nil
+	}
+
+	if p.cache != nil {
+		p.cache.Set(cacheKey, at)
+	}
+
+	return at, nil
+}
+
+func (p *Client) buildCacheKey() string {
+	privateKeyDigest := sha256.Sum256(p.privateKey)
+	keyParts := []string{
+		fmt.Sprintf("%s=%s", AppIDKey, p.appID),
+		fmt.Sprintf("%s=%s", AppInstallationIDKey, p.installationID),
+		fmt.Sprintf("%s=%s", AppBaseUrlKey, p.apiURL),
+		fmt.Sprintf("%sDigest=%x", AppPrivateKey, privateKeyDigest),
+	}
+	return strings.Join(keyParts, ",")
 }

auth/github/client_test.go

@@ -26,6 +26,7 @@ import (
 	"testing"
 	"time"
 
+	"github.com/fluxcd/pkg/cache"
 	"github.com/fluxcd/pkg/ssh"
 	. "github.com/onsi/gomega"
 )
@@ -158,6 +159,7 @@ func TestClient_GetToken(t *testing.T) {
 	expiresAt := time.Now().UTC().Add(time.Hour)
 	tests := []struct {
 		name         string
+		opts         []OptFunc
 		accessToken  *AppToken
 		statusCode   int
 		wantErr      bool
@@ -175,6 +177,22 @@ func TestClient_GetToken(t *testing.T) {
 				ExpiresAt: expiresAt,
 			},
 		},
+		{
+			name: "Get cached token",
+			opts: []OptFunc{func(c *Client) {
+				cache := cache.NewTokenCache(1)
+				cache.Set(c.buildCacheKey(), &AppToken{
+					Token:     "access-token",
+					ExpiresAt: expiresAt,
+				})
+				c.cache = cache
+			}},
+			statusCode: http.StatusInternalServerError, // error status code to make the test fail if the token is not cached
+			wantAppToken: &AppToken{
+				Token:     "access-token",
+				ExpiresAt: expiresAt,
+			},
+		},
 		{
 			name:       "Failure in getting token",
 			statusCode: http.StatusInternalServerError,
@@ -206,6 +224,7 @@ func TestClient_GetToken(t *testing.T) {
 			opts := []OptFunc{
 				WithAppBaseURL(srv.URL), WithInstllationID("123"), WithAppID("456"), WithPrivateKey(kp.PrivateKey),
 			}
+			opts = append(opts, tt.opts...)
 
 			provider, err := New(opts...)
 			g.Expect(err).ToNot(HaveOccurred())

auth/go.mod

@@ -2,32 +2,44 @@ module github.com/fluxcd/pkg/auth
 
 go 1.23.0
 
-replace github.com/fluxcd/pkg/ssh => ../ssh
+replace (
+	github.com/fluxcd/pkg/cache => ../cache
+	github.com/fluxcd/pkg/ssh => ../ssh
+)
 
 require (
 	github.com/Azure/azure-sdk-for-go/sdk/azcore v1.17.0
-	github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.8.1
-	github.com/bradleyfalzon/ghinstallation/v2 v2.13.0
-	github.com/fluxcd/pkg/ssh v0.16.0
+	github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.8.2
+	github.com/bradleyfalzon/ghinstallation/v2 v2.14.0
+	github.com/fluxcd/pkg/cache v0.0.0-00010101000000-000000000000
+	github.com/fluxcd/pkg/ssh v0.17.0
 	github.com/onsi/gomega v1.36.2
-	golang.org/x/net v0.34.0
+	golang.org/x/net v0.35.0
 )
 
 require (
 	github.com/Azure/azure-sdk-for-go/sdk/internal v1.10.0 // indirect
-	github.com/AzureAD/microsoft-authentication-library-for-go v1.3.2 // indirect
+	github.com/AzureAD/microsoft-authentication-library-for-go v1.4.0 // indirect
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
 	github.com/golang-jwt/jwt/v4 v4.5.1 // indirect
 	github.com/golang-jwt/jwt/v5 v5.2.1 // indirect
-	github.com/google/go-cmp v0.6.0 // indirect
-	github.com/google/go-github/v68 v68.0.0 // indirect
+	github.com/google/go-cmp v0.7.0 // indirect
+	github.com/google/go-github/v69 v69.2.0 // indirect
 	github.com/google/go-querystring v1.1.0 // indirect
 	github.com/google/uuid v1.6.0 // indirect
 	github.com/kylelemons/godebug v1.1.0 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c // indirect
 	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
-	golang.org/x/crypto v0.32.0 // indirect
-	golang.org/x/sys v0.29.0 // indirect
-	golang.org/x/text v0.21.0 // indirect
+	github.com/prometheus/client_golang v1.20.5 // indirect
+	github.com/prometheus/client_model v0.6.1 // indirect
+	github.com/prometheus/common v0.55.0 // indirect
+	github.com/prometheus/procfs v0.15.1 // indirect
+	golang.org/x/crypto v0.34.0 // indirect
+	golang.org/x/sys v0.30.0 // indirect
+	golang.org/x/text v0.22.0 // indirect
+	google.golang.org/protobuf v1.36.1 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

auth/go.sum

@@ -1,17 +1,19 @@
 github.com/Azure/azure-sdk-for-go/sdk/azcore v1.17.0 h1:g0EZJwz7xkXQiZAI5xi9f3WWFYBlX1CPTrR+NDToRkQ=
 github.com/Azure/azure-sdk-for-go/sdk/azcore v1.17.0/go.mod h1:XCW7KnZet0Opnr7HccfUw1PLc4CjHqpcaxW8DHklNkQ=
-github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.8.1 h1:1mvYtZfWQAnwNah/C+Z+Jb9rQH95LPE2vlmMuWAHJk8=
-github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.8.1/go.mod h1:75I/mXtme1JyWFtz8GocPHVFyH421IBoZErnO16dd0k=
-github.com/Azure/azure-sdk-for-go/sdk/azidentity/cache v0.3.1 h1:Bk5uOhSAenHyR5P61D/NzeQCv+4fEVV8mOkJ82NqpWw=
-github.com/Azure/azure-sdk-for-go/sdk/azidentity/cache v0.3.1/go.mod h1:QZ4pw3or1WPmRBxf0cHd1tknzrT54WPBOQoGutCPvSU=
+github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.8.2 h1:F0gBpfdPLGsw+nsgk6aqqkZS1jiixa5WwFe3fk/T3Ys=
+github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.8.2/go.mod h1:SqINnQ9lVVdRlyC8cd1lCI0SdX4n2paeABd2K8ggfnE=
+github.com/Azure/azure-sdk-for-go/sdk/azidentity/cache v0.3.2 h1:yz1bePFlP5Vws5+8ez6T3HWXPmwOK7Yvq8QxDBD3SKY=
+github.com/Azure/azure-sdk-for-go/sdk/azidentity/cache v0.3.2/go.mod h1:Pa9ZNPuoNu/GztvBSKk9J1cDJW6vk/n0zLtV4mgd8N8=
 github.com/Azure/azure-sdk-for-go/sdk/internal v1.10.0 h1:ywEEhmNahHBihViHepv3xPBn1663uRv2t2q/ESv9seY=
 github.com/Azure/azure-sdk-for-go/sdk/internal v1.10.0/go.mod h1:iZDifYGJTIgIIkYRNWPENUnqx6bJ2xnSDFI2tjwZNuY=
 github.com/AzureAD/microsoft-authentication-extensions-for-go/cache v0.1.1 h1:WJTmL004Abzc5wDB5VtZG2PJk5ndYDgVacGqfirKxjM=
 github.com/AzureAD/microsoft-authentication-extensions-for-go/cache v0.1.1/go.mod h1:tCcJZ0uHAmvjsVYzEFivsRTN00oz5BEsRgQHu5JZ9WE=
-github.com/AzureAD/microsoft-authentication-library-for-go v1.3.2 h1:kYRSnvJju5gYVyhkij+RTJ/VR6QIUaCfWeaFm2ycsjQ=
-github.com/AzureAD/microsoft-authentication-library-for-go v1.3.2/go.mod h1:wP83P5OoQ5p6ip3ScPr0BAq0BvuPAvacpEuSzyouqAI=
-github.com/bradleyfalzon/ghinstallation/v2 v2.13.0 h1:5FhjW93/YLQJDmPdeyMPw7IjAPzqsr+0jHPfrPz0sZI=
-github.com/bradleyfalzon/ghinstallation/v2 v2.13.0/go.mod h1:EJ6fgedVEHa2kUyBTTvslJCXJafS/mhJNNKEOCspZXQ=
+github.com/AzureAD/microsoft-authentication-library-for-go v1.4.0 h1:MUkXAnvvDHgvPItl0nBj0hgk0f7hnnQbGm0h0+YxbN4=
+github.com/AzureAD/microsoft-authentication-library-for-go v1.4.0/go.mod h1:wP83P5OoQ5p6ip3ScPr0BAq0BvuPAvacpEuSzyouqAI=
+github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
+github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
+github.com/bradleyfalzon/ghinstallation/v2 v2.14.0 h1:0D4vKCHOvYrDU8u61TnE2JfNT4VRrBLphmxtqazTO+M=
+github.com/bradleyfalzon/ghinstallation/v2 v2.14.0/go.mod h1:LOVmdZYVZ8jqdr4n9wWm1ocDiMz9IfMGfRkaYC1a52A=
 github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
 github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc h1:U9qPSI2PIWSS1VwoXQT9A3Wy9MM3WgvqSxFWenqJduM=
@@ -27,10 +29,10 @@ github.com/golang-jwt/jwt/v4 v4.5.1/go.mod h1:m21LjoU+eqJr34lmDMbreY2eSTRJ1cv77w
 github.com/golang-jwt/jwt/v5 v5.2.1 h1:OuVbFODueb089Lh128TAcimifWaLhJwVflnrgM17wHk=
 github.com/golang-jwt/jwt/v5 v5.2.1/go.mod h1:pqrtFR0X4osieyHYxtmOUWsAWrfe1Q5UVIyoH402zdk=
 github.com/google/go-cmp v0.5.2/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
-github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
-github.com/google/go-github/v68 v68.0.0 h1:ZW57zeNZiXTdQ16qrDiZ0k6XucrxZ2CGmoTvcCyQG6s=
-github.com/google/go-github/v68 v68.0.0/go.mod h1:K9HAUBovM2sLwM408A18h+wd9vqdLOEqTUCbnRIcx68=
+github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
+github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
+github.com/google/go-github/v69 v69.2.0 h1:wR+Wi/fN2zdUx9YxSmYE0ktiX9IAR/BeePzeaUUbEHE=
+github.com/google/go-github/v69 v69.2.0/go.mod h1:xne4jymxLR6Uj9b7J7PyTpkMYstEMMwGZa0Aehh1azM=
 github.com/google/go-querystring v1.1.0 h1:AnCroh3fv4ZBgVIf1Iwtovgjaw/GiKJo8M8yD/fhyJ8=
 github.com/google/go-querystring v1.1.0/go.mod h1:Kcdr2DB4koayq7X8pmAG4sNG59So17icRSOU623lUBU=
 github.com/google/pprof v0.0.0-20241210010833-40e02aabc2ad h1:a6HEuzUHeKH6hwfN/ZoQgRgVIWFJljSWa/zetS2WTvg=
@@ -39,12 +41,16 @@ github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/keybase/go-keychain v0.0.0-20231219164618-57a3676c3af6 h1:IsMZxCuZqKuao2vNdfD82fjjgPLfyHLpR41Z88viRWs=
 github.com/keybase/go-keychain v0.0.0-20231219164618-57a3676c3af6/go.mod h1:3VeWNIJaW+O5xpRQbPp0Ybqu1vJd/pm7s2F473HRrkw=
+github.com/klauspost/compress v1.17.9 h1:6KIumPrER1LHsvBVuDa0r5xaG0Es51mhhB9BQB2qeMA=
+github.com/klauspost/compress v1.17.9/go.mod h1:Di0epgTjJY877eYKx5yC51cX2A2Vl2ibi7bDH9ttBbw=
 github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
 github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
 github.com/kylelemons/godebug v1.1.0 h1:RPNrshWIDI6G2gRW9EHilWtl7Z6Sb1BR0xunSBf0SNc=
 github.com/kylelemons/godebug v1.1.0/go.mod h1:9/0rRGxNHcop5bhtWyNeEfOS8JIWk580+fNqagV/RAw=
+github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 h1:C3w9PqII01/Oq1c1nUAm88MOHcQC9l5mIlSMApZMrHA=
+github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822/go.mod h1:+n7T8mK8HuQTcFwEeznm/DIxMOiR9yIdICNftLE1DvQ=
 github.com/onsi/ginkgo/v2 v2.22.1 h1:QW7tbJAUDyVDVOM5dFa7qaybo+CRfR7bemlQUN6Z8aM=
 github.com/onsi/ginkgo/v2 v2.22.1/go.mod h1:S6aTpoRsSq2cZOd+pssHAlKW/Q/jZt6cPrPlnj4a1xM=
 github.com/onsi/gomega v1.36.2 h1:koNYke6TVk6ZmnyHrCXba/T/MoLBXFjeC1PtvYgw0A8=
@@ -53,26 +59,36 @@ github.com/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c h1:+mdjkGKdHQG3305AYmd
 github.com/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c/go.mod h1:7rwL4CYBLnjLxUqIJNnCWiEdr3bn6IUYi15bNlnbCCU=
 github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 h1:Jamvg5psRIccs7FGNTlIRMkT8wgtp5eCXdBlqhYGL6U=
 github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/prometheus/client_golang v1.20.5 h1:cxppBPuYhUnsO6yo/aoRol4L7q7UFfdm+bR9r+8l63Y=
+github.com/prometheus/client_golang v1.20.5/go.mod h1:PIEt8X02hGcP8JWbeHyeZ53Y/jReSnHgO035n//V5WE=
+github.com/prometheus/client_model v0.6.1 h1:ZKSh/rekM+n3CeS952MLRAdFwIKqeY8b62p8ais2e9E=
+github.com/prometheus/client_model v0.6.1/go.mod h1:OrxVMOVHjw3lKMa8+x6HeMGkHMQyHDk9E3jmP2AmGiY=
+github.com/prometheus/common v0.55.0 h1:KEi6DK7lXW/m7Ig5i47x0vRzuBsHuvJdi5ee6Y3G1dc=
+github.com/prometheus/common v0.55.0/go.mod h1:2SECS4xJG1kd8XF9IcM1gMX6510RAEL65zxzNImwdc8=
+github.com/prometheus/procfs v0.15.1 h1:YagwOFzUgYfKKHX6Dr+sHT7km/hxC76UB0learggepc=
+github.com/prometheus/procfs v0.15.1/go.mod h1:fB45yRUv8NstnjriLhBQLuOUt+WW4BsoGhij/e3PBqk=
 github.com/redis/go-redis/v9 v9.7.0 h1:HhLSs+B6O021gwzl+locl0zEDnyNkxMtf/Z3NNBMa9E=
 github.com/redis/go-redis/v9 v9.7.0/go.mod h1:f6zhXITC7JUJIlPEiBOTXxJgPLdZcA93GewI7inzyWw=
 github.com/rogpeppe/go-internal v1.12.0 h1:exVL4IDcn6na9z1rAb56Vxr+CgyK3nn3O+epU5NdKM8=
 github.com/rogpeppe/go-internal v1.12.0/go.mod h1:E+RYuTGaKKdloAfM02xzb0FW3Paa99yedzYV+kq4uf4=
 github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
 github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
-golang.org/x/crypto v0.32.0 h1:euUpcYgM8WcP71gNpTqQCn6rC2t6ULUPiOzfWaXVVfc=
-golang.org/x/crypto v0.32.0/go.mod h1:ZnnJkOaASj8g0AjIduWNlq2NRxL0PlBrbKVyZ6V/Ugc=
-golang.org/x/net v0.34.0 h1:Mb7Mrk043xzHgnRM88suvJFwzVrRfHEHJEl5/71CKw0=
-golang.org/x/net v0.34.0/go.mod h1:di0qlW3YNM5oh6GqDGQr92MyTozJPmybPK4Ev/Gm31k=
+golang.org/x/crypto v0.34.0 h1:+/C6tk6rf/+t5DhUketUbD1aNGqiSX3j15Z6xuIDlBA=
+golang.org/x/crypto v0.34.0/go.mod h1:dy7dXNW32cAb/6/PRuTNsix8T+vJAqvuIy5Bli/x0YQ=
+golang.org/x/net v0.35.0 h1:T5GQRQb2y08kTAByq9L4/bz8cipCdA8FbRTXewonqY8=
+golang.org/x/net v0.35.0/go.mod h1:EglIi67kWsHKlRzzVMUD93VMSWGFOMSZgxFjparz1Qk=
 golang.org/x/sys v0.1.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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