From 4b3fb925e00aba9f012800b22f119b70febfd6ac Mon Sep 17 00:00:00 2001 From: Daniel Garcia Date: Thu, 19 Mar 2026 16:44:21 -0500 Subject: [PATCH] Add k8ssecret hotload strategy for cross-namespace secret watching New separate Go module (k8ssecret/) that implements hotload.Strategy by watching Kubernetes Secrets via the K8s API. This enables cross-namespace secret watching for services that cannot mount secrets from other namespaces as volumes. DSN format: k8ssecret://pgx/?namespace=&dsn= The module has its own go.mod to keep client-go and its transitive dependencies out of the root hotload module. Also fixes pre-existing CI failure by bumping Dockerfile.test and Dockerfile.integrationtest from golang:1.23 to golang:1.24 (ginkgo v2.28.1 requires go >= 1.24.0). --- Dockerfile.integrationtest | 4 +- Dockerfile.test | 2 +- k8ssecret/README.md | 124 +++++++++++++++++ k8ssecret/go.mod | 59 ++++++++ k8ssecret/go.sum | 255 ++++++++++++++++++++++++++++++++++ k8ssecret/strategy.go | 272 +++++++++++++++++++++++++++++++++++++ k8ssecret/strategy_test.go | 205 ++++++++++++++++++++++++++++ 7 files changed, 918 insertions(+), 3 deletions(-) create mode 100644 k8ssecret/README.md create mode 100644 k8ssecret/go.mod create mode 100644 k8ssecret/go.sum create mode 100644 k8ssecret/strategy.go create mode 100644 k8ssecret/strategy_test.go diff --git a/Dockerfile.integrationtest b/Dockerfile.integrationtest index 0f74f05..54aa6d2 100644 --- a/Dockerfile.integrationtest +++ b/Dockerfile.integrationtest @@ -1,10 +1,10 @@ -FROM golang:1.23 AS builder +FROM golang:1.24 AS builder WORKDIR /go/src/github.com/infobloxopen/hotload/ COPY . . # build integration test binary RUN make build-test -FROM golang:1.23 AS runner +FROM golang:1.24 AS runner COPY --from=builder /go/src/github.com/infobloxopen/hotload/integrationtests.test . diff --git a/Dockerfile.test b/Dockerfile.test index 2e59fde..03e9ba5 100644 --- a/Dockerfile.test +++ b/Dockerfile.test @@ -1,4 +1,4 @@ -FROM golang:1.23 +FROM golang:1.24 WORKDIR /go/src/github.com/infobloxopen/hotload COPY . . RUN make ci-test diff --git a/k8ssecret/README.md b/k8ssecret/README.md new file mode 100644 index 0000000..96217ea --- /dev/null +++ b/k8ssecret/README.md @@ -0,0 +1,124 @@ +# hotload/k8ssecret + +A [hotload](https://github.com/infobloxopen/hotload) strategy that watches Kubernetes Secrets for connection string changes via the K8s API. + +Use this when the Secret containing your database credentials is in a **different namespace** than your application — where a volume mount isn't possible. + +## Installation + +```bash +go get github.com/infobloxopen/hotload/k8ssecret +``` + +This is a separate Go module. It pulls in `k8s.io/client-go` but does **not** add those dependencies to the root `hotload` module. + +## Usage + +```go +import ( + "database/sql" + + _ "github.com/infobloxopen/hotload" + _ "github.com/infobloxopen/hotload/k8ssecret" + _ "github.com/jackc/pgx/v5/stdlib" // or any sql driver +) + +func main() { + // The Secret "orders-db" in namespace "orders-ns" has a key "dsn.txt" + // containing: postgres://statexfer:s3cret@orders-pg:5432/orders?sslmode=require + db, err := sql.Open("hotload", "k8ssecret://pgx/orders-db?namespace=orders-ns&dsn=dsn.txt") + if err != nil { + log.Fatal(err) + } + db.Query("SELECT 1") +} +``` + +When the Secret is updated (e.g., credential rotation), hotload detects the change and transparently creates new connections with the updated DSN. + +## DSN Format + +``` +k8ssecret:///?namespace=&dsn= +``` + +| Component | Description | +|-----------|-------------| +| `` | The registered database driver name (e.g., `pgx`, `postgres`, `mysql`) | +| `` | Kubernetes Secret name | +| `namespace` | Namespace containing the Secret. Defaults to the pod's namespace (from service account mount) or `"default"`. | +| `dsn` | Data key within the Secret that holds the connection string. Defaults to `"dsn.txt"`. | + +## Kubernetes Secret + +The Secret holds connection strings as data keys. Each key is a file when volume-mounted, or a watchable field via this strategy: + +```yaml +apiVersion: v1 +kind: Secret +metadata: + name: orders-db + namespace: orders-ns +type: Opaque +stringData: + dsn.txt: "postgres://statexfer:s3cret@orders-pg:5432/orders?sslmode=require" +``` + +The `dsn` parameter selects which key to read: + +``` +k8ssecret://pgx/orders-db?namespace=orders-ns&dsn=dsn.txt +``` + +## When to Use This vs fsnotify + +| Scenario | Strategy | Why | +|----------|----------|-----| +| Secret in the **same** namespace | `fsnotify` | Mount the Secret as a volume. Cheaper — no API calls. | +| Secret in a **different** namespace | `k8ssecret` | Volume mounts can't cross namespaces. This strategy watches via the K8s API. | + +For same-namespace Secrets mounted as volumes: + +```go +// Secret mounted at /var/run/secrets/myapp/dsn.txt +db, err := sql.Open("hotload", "fsnotify://pgx/var/run/secrets/myapp/dsn.txt") +``` + +## RBAC + +The service account running your application needs `get` and `watch` permissions on the target Secret: + +```yaml +apiVersion: rbac.authorization.k8s.io/v1 +kind: Role +metadata: + name: secret-reader + namespace: orders-ns +rules: + - apiGroups: [""] + resources: ["secrets"] + resourceNames: ["orders-db"] + verbs: ["get", "watch"] +--- +apiVersion: rbac.authorization.k8s.io/v1 +kind: RoleBinding +metadata: + name: statexd-reads-orders-db + namespace: orders-ns +subjects: + - kind: ServiceAccount + name: statexd + namespace: statexfer-system +roleRef: + kind: Role + name: secret-reader + apiGroup: rbac.authorization.k8s.io +``` + +## How It Works + +1. On first `Watch()` call, the strategy fetches the Secret via `Secrets(namespace).Get()`. +2. It reads the value of the specified `key` and returns it as the initial connection string. +3. A background goroutine establishes a K8s watch on the Secret. +4. When the Secret is modified, the new value is pushed to hotload, which transparently rotates connections. +5. If the watch is interrupted (API server restart, network partition), it reconnects automatically with a 2-second backoff. diff --git a/k8ssecret/go.mod b/k8ssecret/go.mod new file mode 100644 index 0000000..2f35887 --- /dev/null +++ b/k8ssecret/go.mod @@ -0,0 +1,59 @@ +module github.com/infobloxopen/hotload/k8ssecret + +go 1.23.0 + +require ( + github.com/infobloxopen/hotload v1.7.4 + k8s.io/api v0.32.3 + k8s.io/apimachinery v0.32.3 + k8s.io/client-go v0.32.3 +) + +require ( + github.com/beorn7/perks v1.0.1 // indirect + github.com/cespare/xxhash/v2 v2.3.0 // indirect + github.com/colega/gaugefuncvec v0.1.0 // indirect + github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect + github.com/emicklei/go-restful/v3 v3.11.0 // indirect + github.com/fxamacker/cbor/v2 v2.7.0 // indirect + github.com/go-logr/logr v1.4.3 // indirect + github.com/go-openapi/jsonpointer v0.21.0 // indirect + github.com/go-openapi/jsonreference v0.20.2 // indirect + github.com/go-openapi/swag v0.23.0 // indirect + github.com/gogo/protobuf v1.3.2 // indirect + github.com/golang/protobuf v1.5.4 // indirect + github.com/google/gnostic-models v0.6.8 // indirect + github.com/google/go-cmp v0.7.0 // indirect + github.com/google/gofuzz v1.2.0 // indirect + github.com/google/uuid v1.6.0 // indirect + github.com/josharian/intern v1.0.0 // indirect + github.com/json-iterator/go v1.1.12 // indirect + github.com/kylelemons/godebug v1.1.0 // indirect + github.com/mailru/easyjson v0.7.7 // indirect + github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect + github.com/modern-go/reflect2 v1.0.2 // indirect + github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect + github.com/pkg/errors v0.9.1 // indirect + github.com/prometheus/client_golang v1.20.0 // 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 + github.com/teivah/onecontext v1.3.0 // indirect + github.com/x448/float16 v0.8.4 // indirect + golang.org/x/net v0.43.0 // indirect + golang.org/x/oauth2 v0.23.0 // indirect + golang.org/x/sys v0.35.0 // indirect + golang.org/x/term v0.34.0 // indirect + golang.org/x/text v0.28.0 // indirect + golang.org/x/time v0.7.0 // indirect + google.golang.org/protobuf v1.36.7 // indirect + gopkg.in/evanphx/json-patch.v4 v4.12.0 // indirect + gopkg.in/inf.v0 v0.9.1 // indirect + gopkg.in/yaml.v3 v3.0.1 // indirect + k8s.io/klog/v2 v2.130.1 // indirect + k8s.io/kube-openapi v0.0.0-20241105132330-32ad38e42d3f // indirect + k8s.io/utils v0.0.0-20241104100929-3ea5e8cea738 // indirect + sigs.k8s.io/json v0.0.0-20241010143419-9aa6b5e7a4b3 // indirect + sigs.k8s.io/structured-merge-diff/v4 v4.4.2 // indirect + sigs.k8s.io/yaml v1.4.0 // indirect +) diff --git a/k8ssecret/go.sum b/k8ssecret/go.sum new file mode 100644 index 0000000..4fe04d8 --- /dev/null +++ b/k8ssecret/go.sum @@ -0,0 +1,255 @@ 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+sigs.k8s.io/structured-merge-diff/v4 v4.4.2/go.mod h1:N8f93tFZh9U6vpxwRArLiikrE5/2tiu1w1AGfACIGE4= +sigs.k8s.io/yaml v1.4.0 h1:Mk1wCc2gy/F0THH0TAp1QYyJNzRm2KCLy3o5ASXVI5E= +sigs.k8s.io/yaml v1.4.0/go.mod h1:Ejl7/uTz7PSA4eKMyQCUTnhZYNmLIl+5c2lQPGR2BPY= diff --git a/k8ssecret/strategy.go b/k8ssecret/strategy.go new file mode 100644 index 0000000..fe045ae --- /dev/null +++ b/k8ssecret/strategy.go @@ -0,0 +1,272 @@ +// Package k8ssecret implements a hotload strategy that watches Kubernetes +// Secrets for database connection string changes. +// +// This package is a separate Go module (github.com/infobloxopen/hotload/k8ssecret) +// to avoid pulling client-go and its transitive dependencies into the root +// hotload module. +// +// # DSN Format +// +// k8ssecret://postgres/?namespace=&dsn= +// +// Parameters: +// - secret-name: the Kubernetes Secret name (the path component) +// - namespace: the namespace containing the Secret (default: pod's namespace via +// in-cluster config, or "default") +// - dsn: the data key within the Secret that holds the DSN (default: "dsn.txt") +// +// # Usage +// +// Import the package for its side effect of registering the strategy: +// +// import _ "github.com/infobloxopen/hotload/k8ssecret" +// +// db, err := sql.Open("hotload", "k8ssecret://pgx/myapp-db?namespace=prod&dsn=dsn.txt") +package k8ssecret + +import ( + "context" + "fmt" + "net/url" + "os" + "strings" + "sync" + "time" + + "github.com/infobloxopen/hotload" + "github.com/infobloxopen/hotload/logger" + corev1 "k8s.io/api/core/v1" + metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" + "k8s.io/apimachinery/pkg/watch" + "k8s.io/client-go/kubernetes" + "k8s.io/client-go/rest" +) + +func init() { + hotload.RegisterStrategy("k8ssecret", NewStrategy()) +} + +// ClientsetFunc constructs a Kubernetes clientset. Replaceable for testing. +var ClientsetFunc = defaultClientset + +func defaultClientset() (kubernetes.Interface, error) { + cfg, err := rest.InClusterConfig() + if err != nil { + return nil, fmt.Errorf("k8ssecret: in-cluster config: %w", err) + } + return kubernetes.NewForConfig(cfg) +} + +// Strategy implements hotload.Strategy by watching Kubernetes Secrets. +type Strategy struct { + mu sync.Mutex + clientset kubernetes.Interface + watches map[string]*secretWatch // key: "namespace/secret" +} + +// NewStrategy creates a new k8ssecret strategy. +func NewStrategy() *Strategy { + return &Strategy{ + watches: make(map[string]*secretWatch), + } +} + +type secretWatch struct { + cancel context.CancelFunc + value string + queries map[string]*queryWatch +} + +type queryWatch struct { + ch chan string +} + +// Watch implements hotload.Strategy. The pth is the Secret name. Query params: +// - namespace: Kubernetes namespace (default: from service account or "default") +// - dsn: Secret data key containing the connection string (default: "dsn.txt") +func (s *Strategy) Watch(ctx context.Context, pth string, pathQry string) (string, <-chan string, error) { + pth = strings.TrimSpace(pth) + pathQry = strings.TrimSpace(pathQry) + + params, err := url.ParseQuery(pathQry) + if err != nil { + return "", nil, fmt.Errorf("k8ssecret: parse query %q: %w", pathQry, err) + } + + namespace := params.Get("namespace") + if namespace == "" { + namespace = podNamespace() + } + key := params.Get("dsn") + if key == "" { + key = "dsn.txt" + } + + s.mu.Lock() + defer s.mu.Unlock() + + if s.clientset == nil { + cs, err := ClientsetFunc() + if err != nil { + return "", nil, err + } + s.clientset = cs + } + + watchKey := namespace + "/" + pth + + sw, exists := s.watches[watchKey] + if !exists { + // Fetch the initial value. + secret, err := s.clientset.CoreV1().Secrets(namespace).Get(ctx, pth, metav1.GetOptions{}) + if err != nil { + return "", nil, fmt.Errorf("k8ssecret: get secret %s/%s: %w", namespace, pth, err) + } + val, ok := secret.Data[key] + if !ok { + return "", nil, fmt.Errorf("k8ssecret: secret %s/%s has no key %q", namespace, pth, key) + } + + watchCtx, cancel := context.WithCancel(context.Background()) + sw = &secretWatch{ + cancel: cancel, + value: string(val), + queries: make(map[string]*queryWatch), + } + s.watches[watchKey] = sw + + go s.runWatch(watchCtx, namespace, pth, key, watchKey) + } + + qw, exists := sw.queries[pathQry] + if !exists { + qw = &queryWatch{ch: make(chan string, 1)} + sw.queries[pathQry] = qw + } + + return sw.value, qw.ch, nil +} + +// CloseWatch implements hotload.Strategy. +func (s *Strategy) CloseWatch(pth string, pathQry string) error { + pth = strings.TrimSpace(pth) + pathQry = strings.TrimSpace(pathQry) + + params, _ := url.ParseQuery(pathQry) + namespace := params.Get("namespace") + if namespace == "" { + namespace = podNamespace() + } + watchKey := namespace + "/" + pth + + s.mu.Lock() + defer s.mu.Unlock() + + sw, ok := s.watches[watchKey] + if !ok { + return nil + } + + qw, ok := sw.queries[pathQry] + if ok { + close(qw.ch) + delete(sw.queries, pathQry) + } + + if len(sw.queries) == 0 { + sw.cancel() + delete(s.watches, watchKey) + } + + return nil +} + +// Close implements hotload.Strategy. +func (s *Strategy) Close() { + s.mu.Lock() + defer s.mu.Unlock() + + for watchKey, sw := range s.watches { + sw.cancel() + for _, qw := range sw.queries { + close(qw.ch) + } + delete(s.watches, watchKey) + } +} + +// runWatch establishes a Kubernetes watch on the Secret and pushes updates. +func (s *Strategy) runWatch(ctx context.Context, namespace, name, key, watchKey string) { + for { + if ctx.Err() != nil { + return + } + + err := s.doWatch(ctx, namespace, name, key, watchKey) + if ctx.Err() != nil { + return + } + + logger.Logf("[k8ssecret]", "watch %s/%s interrupted: %v, reconnecting...", namespace, name, err) + select { + case <-ctx.Done(): + return + case <-time.After(2 * time.Second): + } + } +} + +func (s *Strategy) doWatch(ctx context.Context, namespace, name, key, watchKey string) error { + watcher, err := s.clientset.CoreV1().Secrets(namespace).Watch(ctx, metav1.ListOptions{ + FieldSelector: "metadata.name=" + name, + }) + if err != nil { + return fmt.Errorf("start watch: %w", err) + } + defer watcher.Stop() + + for { + select { + case <-ctx.Done(): + return ctx.Err() + case event, ok := <-watcher.ResultChan(): + if !ok { + return fmt.Errorf("watch channel closed") + } + if event.Type != watch.Modified { + continue + } + secret, ok := event.Object.(*corev1.Secret) + if !ok { + continue + } + val, ok := secret.Data[key] + if !ok { + continue + } + + s.mu.Lock() + sw, exists := s.watches[watchKey] + if exists && string(val) != sw.value { + sw.value = string(val) + for _, qw := range sw.queries { + select { + case qw.ch <- string(val): + default: + // Drop if consumer is slow — they'll get the next update. + } + } + } + s.mu.Unlock() + } + } +} + +// podNamespace returns the namespace of the current pod from the service account +// mount, or "default" if not running in-cluster. +func podNamespace() string { + if ns, err := os.ReadFile("/var/run/secrets/kubernetes.io/serviceaccount/namespace"); err == nil { + return strings.TrimSpace(string(ns)) + } + return "default" +} diff --git a/k8ssecret/strategy_test.go b/k8ssecret/strategy_test.go new file mode 100644 index 0000000..1f73d9f --- /dev/null +++ b/k8ssecret/strategy_test.go @@ -0,0 +1,205 @@ +package k8ssecret + +import ( + "context" + "testing" + "time" + + corev1 "k8s.io/api/core/v1" + metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" + "k8s.io/client-go/kubernetes" + "k8s.io/client-go/kubernetes/fake" +) + +func fakeClientset(secrets ...*corev1.Secret) kubernetes.Interface { + objs := make([]interface{}, len(secrets)) + for i, s := range secrets { + // Ensure runtime.Object interface satisfied + _ = s + objs[i] = s + } + cs := fake.NewSimpleClientset() + for _, s := range secrets { + cs.CoreV1().Secrets(s.Namespace).Create(context.Background(), s, metav1.CreateOptions{}) + } + return cs +} + +func makeSecret(namespace, name, key, value string) *corev1.Secret { + return &corev1.Secret{ + ObjectMeta: metav1.ObjectMeta{ + Name: name, + Namespace: namespace, + }, + Data: map[string][]byte{ + key: []byte(value), + }, + } +} + +func TestWatch_InitialValue(t *testing.T) { + cs := fakeClientset(makeSecret("prod", "mydb", "dsn", "postgres://host/db")) + + s := NewStrategy() + s.clientset = cs + defer s.Close() + + val, ch, err := s.Watch(context.Background(), "mydb", "namespace=prod&dsn=dsn") + if err != nil { + t.Fatalf("Watch: %v", err) + } + if val != "postgres://host/db" { + t.Errorf("initial value = %q, want %q", val, "postgres://host/db") + } + if ch == nil { + t.Fatal("expected non-nil channel") + } +} + +func TestWatch_SecretNotFound(t *testing.T) { + cs := fakeClientset() // no secrets + + s := NewStrategy() + s.clientset = cs + defer s.Close() + + _, _, err := s.Watch(context.Background(), "missing", "namespace=prod&dsn=dsn") + if err == nil { + t.Fatal("expected error for missing secret") + } +} + +func TestWatch_KeyNotFound(t *testing.T) { + cs := fakeClientset(makeSecret("prod", "mydb", "password", "secret123")) + + s := NewStrategy() + s.clientset = cs + defer s.Close() + + _, _, err := s.Watch(context.Background(), "mydb", "namespace=prod&dsn=dsn") + if err == nil { + t.Fatal("expected error for missing key") + } +} + +func TestWatch_DefaultKey(t *testing.T) { + cs := fakeClientset(makeSecret("default", "mydb", "dsn.txt", "postgres://host/db")) + + s := NewStrategy() + s.clientset = cs + defer s.Close() + + val, _, err := s.Watch(context.Background(), "mydb", "namespace=default") + if err != nil { + t.Fatalf("Watch: %v", err) + } + if val != "postgres://host/db" { + t.Errorf("value = %q, want %q", val, "postgres://host/db") + } +} + +func TestWatch_Update(t *testing.T) { + secret := makeSecret("prod", "mydb", "dsn", "postgres://old/db") + cs := fake.NewSimpleClientset(secret) + + s := NewStrategy() + s.clientset = cs + defer s.Close() + + val, ch, err := s.Watch(context.Background(), "mydb", "namespace=prod&dsn=dsn") + if err != nil { + t.Fatalf("Watch: %v", err) + } + if val != "postgres://old/db" { + t.Fatalf("initial = %q, want %q", val, "postgres://old/db") + } + + // Give the watch goroutine time to establish. + time.Sleep(500 * time.Millisecond) + + // Update the secret via the API — the fake clientset propagates to watchers. + updated := makeSecret("prod", "mydb", "dsn", "postgres://new/db") + _, err = cs.CoreV1().Secrets("prod").Update(context.Background(), updated, metav1.UpdateOptions{}) + if err != nil { + t.Fatalf("update secret: %v", err) + } + + select { + case newVal := <-ch: + if newVal != "postgres://new/db" { + t.Errorf("update = %q, want %q", newVal, "postgres://new/db") + } + case <-time.After(5 * time.Second): + t.Fatal("timed out waiting for update") + } +} + +func TestCloseWatch(t *testing.T) { + cs := fakeClientset(makeSecret("prod", "mydb", "dsn", "postgres://host/db")) + + s := NewStrategy() + s.clientset = cs + + _, _, err := s.Watch(context.Background(), "mydb", "namespace=prod&dsn=dsn") + if err != nil { + t.Fatalf("Watch: %v", err) + } + + err = s.CloseWatch("mydb", "namespace=prod&dsn=dsn") + if err != nil { + t.Fatalf("CloseWatch: %v", err) + } + + s.mu.Lock() + if len(s.watches) != 0 { + t.Errorf("expected 0 watches after CloseWatch, got %d", len(s.watches)) + } + s.mu.Unlock() + + s.Close() +} + +func TestClose(t *testing.T) { + cs := fakeClientset( + makeSecret("prod", "db1", "dsn", "postgres://host/db1"), + makeSecret("prod", "db2", "dsn", "postgres://host/db2"), + ) + + s := NewStrategy() + s.clientset = cs + + s.Watch(context.Background(), "db1", "namespace=prod&dsn=dsn") + s.Watch(context.Background(), "db2", "namespace=prod&dsn=dsn") + + s.Close() + + s.mu.Lock() + if len(s.watches) != 0 { + t.Errorf("expected 0 watches after Close, got %d", len(s.watches)) + } + s.mu.Unlock() +} + +func TestMultipleQueriesSamePath(t *testing.T) { + cs := fakeClientset(makeSecret("prod", "mydb", "dsn", "postgres://host/db")) + + s := NewStrategy() + s.clientset = cs + defer s.Close() + + val1, ch1, err := s.Watch(context.Background(), "mydb", "namespace=prod&dsn=dsn") + if err != nil { + t.Fatalf("Watch 1: %v", err) + } + val2, ch2, err := s.Watch(context.Background(), "mydb", "namespace=prod&dsn=dsn&extra=1") + if err != nil { + t.Fatalf("Watch 2: %v", err) + } + + if val1 != val2 { + t.Errorf("initial values differ: %q vs %q", val1, val2) + } + if ch1 == nil || ch2 == nil { + t.Fatal("expected non-nil channels") + } +}