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fix: get namespace from file for Kubernetes storage client

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Signed-off-by: m.nabokikh <maksim.nabokikh@flant.com>
This commit is contained in:
m.nabokikh 2021-04-20 15:41:12 +04:00
parent baec4f79ce
commit 0754c30ac2
2 changed files with 163 additions and 34 deletions
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94
storage/kubernetes/client.go
View file

@ -307,10 +307,10 @@ func newClient(cluster k8sapi.Cluster, user k8sapi.AuthInfo, namespace string, l
var t http.RoundTripper
httpTransport := &http.Transport{
Proxy: http.ProxyFromEnvironment,
Dial: (&net.Dialer{
DialContext: (&net.Dialer{
Timeout: 30 * time.Second,
KeepAlive: 30 * time.Second,
}).Dial,
}).DialContext,
TLSClientConfig: tlsConfig,
TLSHandshakeTimeout: 10 * time.Second,
ExpectContinueTimeout: 1 * time.Second,
@ -423,34 +423,76 @@ func namespaceFromServiceAccountJWT(s string) (string, error) {
return data.Namespace, nil
}
func inClusterConfig() (cluster k8sapi.Cluster, user k8sapi.AuthInfo, namespace string, err error) {
host, port := os.Getenv("KUBERNETES_SERVICE_HOST"), os.Getenv("KUBERNETES_SERVICE_PORT")
func namespaceFromFile(path string) (string, error) {
data, err := ioutil.ReadFile(path)
if err != nil {
return "", err
}
return string(data), nil
}
func getInClusterConfigNamespace(token, namespaceENV, namespacePath string) (string, error) {
namespace := os.Getenv(namespaceENV)
if namespace != "" {
return namespace, nil
}
namespace, err := namespaceFromServiceAccountJWT(token)
if err == nil {
return namespace, nil
}
err = fmt.Errorf("inspect service account token: %v", err)
namespace, fileErr := namespaceFromFile(namespacePath)
if fileErr == nil {
return namespace, nil
}
return "", fmt.Errorf("%v: trying to get namespace from file: %v", err, fileErr)
}
func inClusterConfig() (k8sapi.Cluster, k8sapi.AuthInfo, string, error) {
const (
serviceAccountPath = "/var/run/secrets/kubernetes.io/serviceaccount/"
serviceAccountTokenPath = serviceAccountPath + "token"
serviceAccountCAPath = serviceAccountPath + "ca.crt"
serviceAccountNamespacePath = serviceAccountPath + "namespace"
kubernetesServiceHostENV = "KUBERNETES_SERVICE_HOST"
kubernetesServicePortENV = "KUBERNETES_SERVICE_PORT"
kubernetesPodNamespaceENV = "KUBERNETES_POD_NAMESPACE"
)
host, port := os.Getenv(kubernetesServiceHostENV), os.Getenv(kubernetesServicePortENV)
if len(host) == 0 || len(port) == 0 {
err = fmt.Errorf("unable to load in-cluster configuration, KUBERNETES_SERVICE_HOST and KUBERNETES_SERVICE_PORT must be defined")
return
return k8sapi.Cluster{}, k8sapi.AuthInfo{}, "", fmt.Errorf(
"unable to load in-cluster configuration, %s and %s must be defined",
kubernetesServiceHostENV,
kubernetesServicePortENV,
)
}
// we need to wrap IPv6 addresses in square brackets
// IPv4 also works with square brackets
host = "[" + host + "]"
cluster = k8sapi.Cluster{
cluster := k8sapi.Cluster{
Server: "https://" + host + ":" + port,
CertificateAuthority: "/var/run/secrets/kubernetes.io/serviceaccount/ca.crt",
CertificateAuthority: serviceAccountCAPath,
}
token, err := ioutil.ReadFile("/var/run/secrets/kubernetes.io/serviceaccount/token")
token, err := ioutil.ReadFile(serviceAccountTokenPath)
if err != nil {
return
}
user = k8sapi.AuthInfo{Token: string(token)}
if namespace = os.Getenv("KUBERNETES_POD_NAMESPACE"); namespace == "" {
namespace, err = namespaceFromServiceAccountJWT(user.Token)
if err != nil {
err = fmt.Errorf("failed to inspect service account token: %v", err)
return
}
return cluster, k8sapi.AuthInfo{}, "", err
}
return
user := k8sapi.AuthInfo{Token: string(token)}
namespace, err := getInClusterConfigNamespace(user.Token, kubernetesPodNamespaceENV, serviceAccountNamespacePath)
if err != nil {
return cluster, user, "", err
}
return cluster, user, namespace, nil
}
func currentContext(config *k8sapi.Config) (cluster k8sapi.Cluster, user k8sapi.AuthInfo, ns string, err error) {
@ -461,7 +503,7 @@ func currentContext(config *k8sapi.Config) (cluster k8sapi.Cluster, user k8sapi.
return cluster, user, "", errors.New("kubeconfig has no current context")
}
}
context, ok := func() (k8sapi.Context, bool) {
k8sContext, ok := func() (k8sapi.Context, bool) {
for _, namedContext := range config.Contexts {
if namedContext.Name == config.CurrentContext {
return namedContext.Context, true
@ -475,26 +517,26 @@ func currentContext(config *k8sapi.Config) (cluster k8sapi.Cluster, user k8sapi.
cluster, ok = func() (k8sapi.Cluster, bool) {
for _, namedCluster := range config.Clusters {
if namedCluster.Name == context.Cluster {
if namedCluster.Name == k8sContext.Cluster {
return namedCluster.Cluster, true
}
}
return k8sapi.Cluster{}, false
}()
if !ok {
return cluster, user, "", fmt.Errorf("no cluster named %q found", context.Cluster)
return cluster, user, "", fmt.Errorf("no cluster named %q found", k8sContext.Cluster)
}
user, ok = func() (k8sapi.AuthInfo, bool) {
for _, namedAuthInfo := range config.AuthInfos {
if namedAuthInfo.Name == context.AuthInfo {
if namedAuthInfo.Name == k8sContext.AuthInfo {
return namedAuthInfo.AuthInfo, true
}
}
return k8sapi.AuthInfo{}, false
}()
if !ok {
return cluster, user, "", fmt.Errorf("no user named %q found", context.AuthInfo)
return cluster, user, "", fmt.Errorf("no user named %q found", k8sContext.AuthInfo)
}
return cluster, user, context.Namespace, nil
return cluster, user, k8sContext.Namespace, nil
}

103
storage/kubernetes/client_test.go
View file

@ -3,8 +3,12 @@ package kubernetes
import (
"hash"
"hash/fnv"
"io/ioutil"
"os"
"sync"
"testing"
"github.com/stretchr/testify/require"
)
// This test does not have an explicit error condition but is used
@ -42,18 +46,101 @@ func TestOfflineTokenName(t *testing.T) {
}
}
func TestNamespaceFromServiceAccountJWT(t *testing.T) {
namespace, err := namespaceFromServiceAccountJWT(serviceAccountToken)
if err != nil {
t.Fatal(err)
func TestGetClusterConfigNamespace(t *testing.T) {
const namespaceENVVariableName = "TEST_GET_CLUSTER_CONFIG_NAMESPACE"
{
os.Setenv(namespaceENVVariableName, "namespace-from-env")
defer os.Unsetenv(namespaceENVVariableName)
}
wantNamespace := "dex-test-namespace"
if namespace != wantNamespace {
t.Errorf("expected namespace %q got %q", wantNamespace, namespace)
var namespaceFile string
{
tmpfile, err := ioutil.TempFile(os.TempDir(), "test-get-cluster-config-namespace")
require.NoError(t, err)
_, err = tmpfile.Write([]byte("namespace-from-file"))
require.NoError(t, err)
namespaceFile = tmpfile.Name()
defer os.Remove(namespaceFile)
}
tests := []struct {
name string
token string
fileName string
envVariable string
expectedError bool
expectedNamespace string
}{
{
name: "With env variable",
envVariable: "TEST_GET_CLUSTER_CONFIG_NAMESPACE",
expectedNamespace: "namespace-from-env",
},
{
name: "With token",
token: serviceAccountToken,
expectedNamespace: "dex-test-namespace",
},
{
name: "With namespace file",
fileName: namespaceFile,
expectedNamespace: "namespace-from-file",
},
{
name: "With file and token",
fileName: namespaceFile,
token: serviceAccountToken,
expectedNamespace: "dex-test-namespace",
},
{
name: "With file and env",
fileName: namespaceFile,
envVariable: "TEST_GET_CLUSTER_CONFIG_NAMESPACE",
expectedNamespace: "namespace-from-env",
},
{
name: "With token and env",
envVariable: "TEST_GET_CLUSTER_CONFIG_NAMESPACE",
token: serviceAccountToken,
expectedNamespace: "namespace-from-env",
},
{
name: "With file, token and env",
fileName: namespaceFile,
token: serviceAccountToken,
envVariable: "TEST_GET_CLUSTER_CONFIG_NAMESPACE",
expectedNamespace: "namespace-from-env",
},
{
name: "Without anything",
expectedError: true,
},
}
for _, tc := range tests {
t.Run(tc.name, func(t *testing.T) {
namespace, err := getInClusterConfigNamespace(tc.token, tc.envVariable, tc.fileName)
if tc.expectedError {
require.Error(t, err)
} else {
require.NoError(t, err)
}
require.Equal(t, namespace, tc.expectedNamespace)
})
}
}
var serviceAccountToken = "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.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.KViBpPwCiBwxDvAjYUUXoVvLVwqV011aLlYQpNtX12Bh8M-QAFch-3RWlo_SR00bcdFg_nZo9JKACYlF_jHMEsf__PaYms9r7vEaSg0jPfkqnL2WXZktzQRyLBr0n-bxeUrbwIWsKOAC0DfFB5nM8XoXljRmq8yAx8BAdmQp7MIFb4EOV9nYthhua6pjzYyaFSiDiYTjw7HtXOvoL8oepodJ3-37pUKS8vdBvnvUoqC4M1YAhkO5L36JF6KV_RfmG8GPEdNQfXotHcsR-3jKi1n8S5l7Xd-rhrGOhSGQizH3dORzo9GvBAhYeqbq1O-NLzm2EQUiMQayIUx7o4g3Kw"
const serviceAccountToken = "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.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.KViBpPwCiBwxDvAjYUUXoVvLVwqV011aLlYQpNtX12Bh8M-QAFch-3RWlo_SR00bcdFg_nZo9JKACYlF_jHMEsf__PaYms9r7vEaSg0jPfkqnL2WXZktzQRyLBr0n-bxeUrbwIWsKOAC0DfFB5nM8XoXljRmq8yAx8BAdmQp7MIFb4EOV9nYthhua6pjzYyaFSiDiYTjw7HtXOvoL8oepodJ3-37pUKS8vdBvnvUoqC4M1YAhkO5L36JF6KV_RfmG8GPEdNQfXotHcsR-3jKi1n8S5l7Xd-rhrGOhSGQizH3dORzo9GvBAhYeqbq1O-NLzm2EQUiMQayIUx7o4g3Kw"
// The following program was used to generate the example token. Since we don't want to
// import Kubernetes, just leave it as a comment.