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refactor: Redo env search logic and add support for CloudNativePG
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,109 @@ | ||
| package kubernetes | ||
|
|
||
| import ( | ||
| "context" | ||
| "errors" | ||
| "fmt" | ||
| "strings" | ||
|
|
||
| corev1 "k8s.io/api/core/v1" | ||
| v1meta "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| ) | ||
|
|
||
| var ( | ||
| ErrEnvVarNotFound = errors.New("env var not found") | ||
| ErrNoDiscoveryEnvs = errors.New("failed to find config") | ||
| ) | ||
|
|
||
| type ConfigFinder interface { | ||
| GetValue(context.Context, KubeClient, corev1.Pod) (string, error) | ||
| } | ||
|
|
||
| type ConfigFinders []ConfigFinder | ||
|
|
||
| func (c ConfigFinders) Search(ctx context.Context, client KubeClient, pod corev1.Pod) (string, error) { | ||
| for _, search := range c { | ||
| found, err := search.GetValue(ctx, client, pod) | ||
| if err == nil { | ||
| return found, nil | ||
| } | ||
| } | ||
| return "", ErrNoDiscoveryEnvs | ||
| } | ||
|
|
||
| type ConfigFromEnv []string | ||
|
|
||
| func (e ConfigFromEnv) GetValue(ctx context.Context, client KubeClient, pod corev1.Pod) (string, error) { | ||
| if len(e) == 0 { | ||
| return "", ErrNoEnvNames | ||
| } | ||
|
|
||
| var err error | ||
| var envVar *corev1.EnvVar | ||
| for _, envName := range e { | ||
| envVar, err = FindEnvVar(pod, envName) | ||
| if err == nil { | ||
| break | ||
| } | ||
| } | ||
| if err != nil { | ||
| if errors.Is(err, ErrEnvVarNotFound) { | ||
| return "", fmt.Errorf("%w: %s", ErrNoDiscoveryEnvs, strings.Join(e, ", ")) | ||
| } | ||
| return "", err | ||
| } | ||
|
|
||
| if envVar.ValueFrom != nil { | ||
| switch { | ||
| case envVar.ValueFrom.SecretKeyRef != nil: | ||
| secretKeyRef := envVar.ValueFrom.SecretKeyRef | ||
| secret, err := client.Secrets().Get(ctx, secretKeyRef.Name, v1meta.GetOptions{}) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| data, ok := secret.Data[secretKeyRef.Key] | ||
| if !ok { | ||
| return "", fmt.Errorf("%w: %v", ErrSecretDoesNotHaveKey, secretKeyRef) | ||
| } | ||
| return string(data), nil | ||
| case envVar.ValueFrom.ConfigMapKeyRef != nil: | ||
| configMapRef := envVar.ValueFrom.ConfigMapKeyRef | ||
| configMap, err := client.ConfigMaps().Get(ctx, configMapRef.Name, v1meta.GetOptions{}) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| data, ok := configMap.Data[configMapRef.Key] | ||
| if !ok { | ||
| return "", fmt.Errorf("%w: %v", ErrConfigMapDoesNotHaveKey, configMapRef) | ||
| } | ||
| return data, nil | ||
| } | ||
| } | ||
| return envVar.Value, nil | ||
| } | ||
|
|
||
| type ConfigFromVolumeSecret struct { | ||
| Name string | ||
| Key string | ||
| } | ||
|
|
||
| func (f ConfigFromVolumeSecret) GetValue(ctx context.Context, client KubeClient, pod corev1.Pod) (string, error) { | ||
| if f.Name == "" || f.Key == "" { | ||
| return "", ErrNoEnvNames | ||
| } | ||
|
|
||
| for _, volume := range pod.Spec.Volumes { | ||
| if volume.Name == f.Name && volume.Secret != nil { | ||
| secret, err := client.Secrets().Get(ctx, volume.Secret.SecretName, v1meta.GetOptions{}) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
|
|
||
| if value, ok := secret.Data[f.Key]; ok { | ||
| return string(value), nil | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return "", ErrNoDiscoveryEnvs | ||
| } |
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