fix: close remaining secret leaks, timeout gaps and config blind spots

- Generated service names come only from a URL host, a key=value DSN's
  host=, or a MySQL tcp() address, so a password in a key=value DSN can no
  longer end up in the name printed on every log line.
- connect_timeout is added only to postgres:// and postgresql:// URLs
  (parsed, so it never lands after a fragment) or as a key=value token, never
  glued onto a key=value value containing "://".
- Driver parse errors that quote password fragments (mongo escape errors,
  lib/pq's missing "=" error) are replaced with generic hints.
- MongoDB keeps its client only after a successful connect, so a failed
  connect is not disconnected twice.
- Couchbase gets ready_timeout plus 1 minute to connect, so raising
  ready_timeout takes effect.
- Shutdown waits at most 7 seconds, inside Docker's 10-second grace period.
- Each adapter declares its config keys; unknown keys anywhere in the file,
  including under config, log a warning without blocking start.

adapter/adapter.go

@@ -75,6 +75,17 @@ type Factory func(Config) (Adapter, error)
 
 var Registry = map[string]Factory{}
 
+// ConfigKeys lists the config keys each adapter reads, so the config loader
+// can warn about misspelled or unsupported keys. counter_key is set by the
+// loader and is not listed.
+var ConfigKeys = map[string][]string{}
+
+// ConnectTimeouter is implemented by adapters whose Connect may legitimately
+// need longer than the runner's default connect timeout.
+type ConnectTimeouter interface {
+	ConnectTimeout() time.Duration
+}
+
 func New(adapterType string, cfg Config) (Adapter, error) {
 	f, ok := Registry[adapterType]
 	if !ok {

adapter/couchbase.go

@@ -8,6 +8,7 @@ import (
 )
 
 func init() {
+	ConfigKeys["couchbase"] = []string{"connection_string", "username", "password", "bucket_name", "scope_name", "collection_name", "ready_timeout", "bucket_ram_quota_mb"}
 	Registry["couchbase"] = func(cfg Config) (Adapter, error) {
 		conn, err := cfg.Required("connection_string")
 		if err != nil {
@@ -118,6 +119,12 @@ func (a *couchbaseAdapter) Increment(ctx context.Context) (int64, error) {
 	return int64(res.Content()), nil
 }
 
+// ConnectTimeout leaves room for ready_timeout, which bounds each of the
+// bucket, scope, collection and document setup steps, plus a margin.
+func (a *couchbaseAdapter) ConnectTimeout() time.Duration {
+	return a.readyTimeout + time.Minute
+}
+
 func (a *couchbaseAdapter) Close(_ context.Context) error {
 	if a.cluster == nil {
 		return nil

adapter/mongodb.go

@@ -9,6 +9,8 @@ import (
 )
 
 func init() {
+	ConfigKeys["mongodb"] = []string{"uri", "database", "collection"}
+	ConfigKeys["mongo"] = ConfigKeys["mongodb"]
 	Registry["mongodb"] = func(cfg Config) (Adapter, error) {
 		uri, err := cfg.Required("uri")
 		if err != nil {
@@ -46,7 +48,6 @@ func (a *mongoAdapter) Connect(ctx context.Context) error {
 	if err != nil {
 		return err
 	}
-	a.client = client
 	a.coll = client.Database(a.dbName).Collection(a.collName)
 	if err := client.Ping(ctx, nil); err != nil {
 		client.Disconnect(ctx)
@@ -56,6 +57,8 @@ func (a *mongoAdapter) Connect(ctx context.Context) error {
 		client.Disconnect(ctx)
 		return err
 	}
+	// Set only on success so Close does not disconnect a failed client again.
+	a.client = client
 	return nil
 }
 

adapter/mysql.go

@@ -9,6 +9,7 @@ import (
 )
 
 func init() {
+	ConfigKeys["mysql"] = []string{"dsn"}
 	Registry["mysql"] = func(cfg Config) (Adapter, error) {
 		dsn, err := cfg.Required("dsn")
 		if err != nil {

adapter/postgresql.go

@@ -3,12 +3,17 @@ package adapter
 import (
 	"context"
 	"database/sql"
+	"net/url"
 	"strings"
 
 	_ "github.com/lib/pq"
 )
 
+const defaultPostgresConnectTimeout = "30"
+
 func init() {
+	ConfigKeys["postgresql"] = []string{"url"}
+	ConfigKeys["postgres"] = ConfigKeys["postgresql"]
 	Registry["postgresql"] = func(cfg Config) (Adapter, error) {
 		url, err := cfg.Required("url")
 		if err != nil {
@@ -86,16 +91,27 @@ func (a *postgresAdapter) Close(_ context.Context) error {
 // withDefaultConnectTimeout adds connect_timeout when the DSN has none:
 // lib/pq honours the context only while dialing, so a server that accepts the
 // connection but never answers the startup handshake would hang forever.
+// Like lib/pq, it treats only postgres:// and postgresql:// strings as URLs
+// and everything else as a key=value DSN.
 func withDefaultConnectTimeout(dsn string) string {
-	if strings.Contains(dsn, "connect_timeout") {
-		return dsn
+	if strings.HasPrefix(dsn, "postgres://") || strings.HasPrefix(dsn, "postgresql://") {
+		u, err := url.Parse(dsn)
+		if err != nil {
+			// Connect reports the parse error.
+			return dsn
+		}
+		q := u.Query()
+		if q.Has("connect_timeout") {
+			return dsn
+		}
+		q.Set("connect_timeout", defaultPostgresConnectTimeout)
+		u.RawQuery = q.Encode()
+		return u.String()
 	}
-	switch {
-	case !strings.Contains(dsn, "://"):
-		return dsn + " connect_timeout=30"
-	case strings.Contains(dsn, "?"):
-		return dsn + "&connect_timeout=30"
-	default:
-		return dsn + "?connect_timeout=30"
+	for _, field := range strings.Fields(dsn) {
+		if strings.HasPrefix(field, "connect_timeout=") {
+			return dsn
+		}
 	}
+	return dsn + " connect_timeout=" + defaultPostgresConnectTimeout
 }

adapter/postgresql_test.go

@@ -5,12 +5,34 @@ import "testing"
 func TestWithDefaultConnectTimeout(t *testing.T) {
 	for _, tc := range []struct{ in, want string }{
 		{"postgres://u:p@db.example.com/k", "postgres://u:p@db.example.com/k?connect_timeout=30"},
-		{"postgres://u:p@db.example.com/k?sslmode=require", "postgres://u:p@db.example.com/k?sslmode=require&connect_timeout=30"},
+		{"postgresql://u:p@db.example.com/k?sslmode=require", "postgresql://u:p@db.example.com/k?connect_timeout=30&sslmode=require"},
 		{"postgres://db.example.com/k?connect_timeout=5", "postgres://db.example.com/k?connect_timeout=5"},
+		// The timeout belongs in the query, never after a fragment.
+		{"postgres://u:p@db.example.com/k#x", "postgres://u:p@db.example.com/k?connect_timeout=30#x"},
 		{"host=db.example.com dbname=k", "host=db.example.com dbname=k connect_timeout=30"},
+		{"host=db.example.com connect_timeout=5", "host=db.example.com connect_timeout=5"},
+		// "://" inside a key=value value does not make it a URL.
+		{"host=h user=u password=a://b dbname=k", "host=h user=u password=a://b dbname=k connect_timeout=30"},
+		// Unparseable URLs are left for Connect to report.
+		{"postgres://u:p%zz@db.example.com/k", "postgres://u:p%zz@db.example.com/k"},
 	} {
 		if got := withDefaultConnectTimeout(tc.in); got != tc.want {
-			t.Fatalf("withDefaultConnectTimeout(%q) = %q, want %q", tc.in, got, tc.want)
+			t.Errorf("withDefaultConnectTimeout(%q) = %q, want %q", tc.in, got, tc.want)
 		}
 	}
 }
+
+func TestConfigKeysCoverEveryAdapter(t *testing.T) {
+	for name := range Registry {
+		if _, ok := ConfigKeys[name]; !ok {
+			t.Errorf("adapter %q has no ConfigKeys entry", name)
+		}
+	}
+}
+
+func TestCouchbaseConnectTimeoutExceedsReadyTimeout(t *testing.T) {
+	a := &couchbaseAdapter{readyTimeout: 2 * 60 * 1e9}
+	if a.ConnectTimeout() <= a.readyTimeout {
+		t.Fatalf("ConnectTimeout %s does not exceed ready_timeout %s", a.ConnectTimeout(), a.readyTimeout)
+	}
+}

adapter/redis.go

@@ -16,6 +16,7 @@ func (discardRedisLogger) Printf(context.Context, string, ...interface{}) {}
 
 func init() {
 	redis.SetLogger(discardRedisLogger{})
+	ConfigKeys["redis"] = []string{"url", "namespace"}
 	Registry["redis"] = func(cfg Config) (Adapter, error) {
 		url, err := cfg.Required("url")
 		if err != nil {

config.go

@@ -6,7 +6,9 @@ import (
 	"fmt"
 	"io"
 	"log"
+	"maps"
 	"os"
+	"slices"
 	"strconv"
 	"strings"
 	"time"
@@ -58,22 +60,48 @@ func loadConfigFile(path string) ([]serviceConfig, error) {
 	if err := yaml.Unmarshal(data, &raw); err != nil {
 		return nil, fmt.Errorf("parse config: %w", err)
 	}
-	if err := checkUnknownFields(data); err != nil {
-		log.Printf("warning: %s: %v; unknown keys are ignored", path, err)
+	for _, warning := range schemaWarnings(data, raw) {
+		log.Printf("warning: %s: %s; ignoring it", path, warning)
 	}
 	return normalizeConfig(raw)
 }
 
-// checkUnknownFields reports keys that appConfig does not define, such as a
-// misspelled interval. Keys under a service's config map are not checked.
-func checkUnknownFields(data []byte) error {
+// schemaWarnings lists every key the config schema does not define: keys
+// appConfig and serviceFileConfig lack (such as a misspelled interval), and
+// keys under a service's config map that its adapter does not read (such as
+// a misspelled namespace). Unknown keys are ignored, not fatal.
+func schemaWarnings(data []byte, raw appConfig) []string {
+	var warnings []string
+
 	decoder := yaml.NewDecoder(bytes.NewReader(data))
 	decoder.KnownFields(true)
-	var raw appConfig
-	if err := decoder.Decode(&raw); err != nil && !errors.Is(err, io.EOF) {
-		return err
+	var strict appConfig
+	if err := decoder.Decode(&strict); err != nil && !errors.Is(err, io.EOF) {
+		var typeErr *yaml.TypeError
+		if errors.As(err, &typeErr) {
+			warnings = append(warnings, typeErr.Errors...)
+		} else {
+			warnings = append(warnings, err.Error())
+		}
 	}
-	return nil
+
+	for i, service := range raw.Services {
+		adapterType := strings.TrimSpace(service.Adapter)
+		known, ok := adapter.ConfigKeys[adapterType]
+		if !ok {
+			// normalizeConfig rejects the unknown adapter itself.
+			continue
+		}
+		for _, key := range slices.Sorted(maps.Keys(service.Config)) {
+			if key == "counter_key" || slices.Contains(known, key) {
+				// normalizeConfig rejects config.counter_key with its own error.
+				continue
+			}
+			warnings = append(warnings, fmt.Sprintf("services[%d].config: unknown key %q for adapter %s (known: %s)",
+				i, key, adapterType, strings.Join(known, ", ")))
+		}
+	}
+	return warnings
 }
 
 func defaultConfigFile() (string, error) {

config_test.go

@@ -6,6 +6,8 @@ import (
 	"strings"
 	"testing"
 	"time"
+
+	"gopkg.in/yaml.v3"
 )
 
 func TestNormalizeConfigGeneratesNamesFromAdapterAndHost(t *testing.T) {
@@ -265,13 +267,34 @@ func TestFirstExistingConfigFileRejectsDirectory(t *testing.T) {
 	}
 }
 
-func TestCheckUnknownFieldsReportsTypos(t *testing.T) {
-	err := checkUnknownFields([]byte("intervall: 1m\nservices:\n  - adapter: redis\n    couter_key: x\n    config:\n      url: redis://cache.example.com\n      anything: goes\n"))
-	if err == nil || !strings.Contains(err.Error(), "intervall") || !strings.Contains(err.Error(), "couter_key") {
-		t.Fatalf("err = %v, want both unknown keys reported", err)
+func TestSchemaWarningsReportsUnknownKeysEverywhere(t *testing.T) {
+	data := []byte("intervall: 1m\nservices:\n  - adapter: redis\n    couter_key: x\n    config:\n      url: redis://cache.example.com\n      namspace: keepalive\n  - adapter: postgres\n    config:\n      url: postgres://db.example.com/k\n")
+	var raw appConfig
+	if err := yaml.Unmarshal(data, &raw); err != nil {
+		t.Fatal(err)
 	}
-	if err := checkUnknownFields([]byte("interval: 1m\nservices:\n  - adapter: redis\n    config:\n      url: redis://cache.example.com\n")); err != nil {
-		t.Fatalf("valid config reported: %v", err)
+	got := strings.Join(schemaWarnings(data, raw), "\n")
+	for _, want := range []string{"intervall", "couter_key", `services[0].config: unknown key "namspace" for adapter redis`} {
+		if !strings.Contains(got, want) {
+			t.Fatalf("warnings %q do not mention %q", got, want)
+		}
+	}
+	if strings.Contains(got, "services[1]") {
+		t.Fatalf("valid service reported: %q", got)
+	}
+}
+
+func TestSchemaWarningsAcceptsValidConfig(t *testing.T) {
+	data, err := os.ReadFile("config.example.yml")
+	if err != nil {
+		t.Fatal(err)
+	}
+	var raw appConfig
+	if err := yaml.Unmarshal(data, &raw); err != nil {
+		t.Fatal(err)
+	}
+	if got := schemaWarnings(data, raw); len(got) != 0 {
+		t.Fatalf("config.example.yml warnings: %q", got)
 	}
 }
 

main.go

@@ -7,6 +7,7 @@ import (
 	"os/signal"
 	"sync"
 	"syscall"
+	"time"
 )
 
 func main() {
@@ -31,5 +32,25 @@ func main() {
 	<-sigCh
 
 	cancel()
-	wg.Wait()
+	waitShutdown(&wg, shutdownTimeout)
+}
+
+// shutdownTimeout stays under Docker's default 10s stop grace period. A
+// driver stuck in a handshake that ignores cancellation (lib/pq) would
+// otherwise hold the process until Docker sends SIGKILL.
+const shutdownTimeout = 7 * time.Second
+
+func waitShutdown(wg *sync.WaitGroup, timeout time.Duration) bool {
+	done := make(chan struct{})
+	go func() {
+		wg.Wait()
+		close(done)
+	}()
+	select {
+	case <-done:
+		return true
+	case <-time.After(timeout):
+		log.Printf("shutdown: services still stopping after %s; exiting", timeout)
+		return false
+	}
 }

runner.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"log"
 	"net/url"
+	"strings"
 	"sync"
 	"time"
 
@@ -37,7 +38,7 @@ func runService(ctx context.Context, wg *sync.WaitGroup, config serviceConfig) {
 				return
 			}
 
-			connectCtx, cancel := context.WithTimeout(ctx, connectTimeout)
+			connectCtx, cancel := context.WithTimeout(ctx, connectTimeoutFor(a))
 			err = a.Connect(connectCtx)
 			cancel()
 			if err != nil {
@@ -101,6 +102,13 @@ func incrementOnce(ctx context.Context, svc runningService) error {
 	return nil
 }
 
+func connectTimeoutFor(a adapter.Adapter) time.Duration {
+	if t, ok := a.(adapter.ConnectTimeouter); ok && t.ConnectTimeout() > connectTimeout {
+		return t.ConnectTimeout()
+	}
+	return connectTimeout
+}
+
 func closeService(_ context.Context, name string, a adapter.Adapter) {
 	if a == nil {
 		return
@@ -112,20 +120,23 @@ func closeService(_ context.Context, name string, a adapter.Adapter) {
 	}
 }
 
-// redactURLError drops the raw URL from a *url.Error. Drivers return one when
-// a connection URL fails to parse, and its message repeats the URL, password
-// included.
+// redactURLError hides connection-string parse errors that quote part of
+// the string, password included: *url.Error repeats the whole URL, an escape
+// error quotes the bad escape, and lib/pq quotes the token after a stray space
+// in a key=value DSN.
 func redactURLError(err error) error {
-	var urlErr *url.Error
-	if !errors.As(err, &urlErr) {
-		return err
-	}
 	var escapeErr url.EscapeError
-	if errors.As(urlErr.Err, &escapeErr) {
-		// The message quotes the bad escape, which may be part of a password.
+	if errors.As(err, &escapeErr) {
 		return errors.New("invalid connection URL: invalid percent-escape; percent-encode special characters in the user name and password")
 	}
-	return fmt.Errorf("invalid connection URL: %w", urlErr.Err)
+	if strings.Contains(err.Error(), `missing "=" after`) {
+		return errors.New("invalid key=value DSN: quote values that contain spaces, like password='a b'")
+	}
+	var urlErr *url.Error
+	if errors.As(err, &urlErr) {
+		return fmt.Errorf("invalid connection URL: %w", urlErr.Err)
+	}
+	return err
 }
 
 func waitContext(ctx context.Context, d time.Duration) bool {

runner_test.go

@@ -201,3 +201,73 @@ func TestRunServiceIncrementsRightAfterConnect(t *testing.T) {
 	cancel()
 	wg.Wait()
 }
+
+func TestRedactURLErrorHidesDriverParseErrors(t *testing.T) {
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second)
+	defer cancel()
+	for _, tc := range []struct{ adapterType, key, value string }{
+		{"mongodb", "uri", "mongodb://user:S3CR%zzpw@db.example.com"},
+		{"postgresql", "url", "host=db.example.com user=u password=abc S3CRETdef dbname=k"},
+	} {
+		cfg := adapter.Config{tc.key: tc.value, "database": "k", "collection": "c"}
+		a, err := adapter.New(tc.adapterType, cfg)
+		if err != nil {
+			t.Fatal(err)
+		}
+		err = a.Connect(ctx)
+		a.Close(ctx)
+		if err == nil {
+			t.Fatalf("%s: want connect error", tc.adapterType)
+		}
+		if got := redactURLError(err).Error(); strings.Contains(got, "S3CR") {
+			t.Fatalf("%s: redacted error leaks password: %s", tc.adapterType, got)
+		}
+	}
+}
+
+func TestWaitShutdownGivesUpAfterTimeout(t *testing.T) {
+	var wg sync.WaitGroup
+	wg.Add(1)
+	defer wg.Done()
+	if waitShutdown(&wg, 10*time.Millisecond) {
+		t.Fatal("waitShutdown reported a clean stop while a service was still running")
+	}
+}
+
+func TestWaitShutdownReturnsWhenServicesStop(t *testing.T) {
+	var wg sync.WaitGroup
+	if !waitShutdown(&wg, time.Second) {
+		t.Fatal("waitShutdown timed out with no running services")
+	}
+}
+
+type slowConnectAdapter struct{ timeout time.Duration }
+
+func (a slowConnectAdapter) Connect(context.Context) error            { return nil }
+func (a slowConnectAdapter) Increment(context.Context) (int64, error) { return 0, nil }
+func (a slowConnectAdapter) Close(context.Context) error              { return nil }
+func (a slowConnectAdapter) ConnectTimeout() time.Duration            { return a.timeout }
+
+func TestConnectTimeoutForUsesLongerAdapterTimeout(t *testing.T) {
+	if got := connectTimeoutFor(slowConnectAdapter{timeout: 3 * time.Minute}); got != 3*time.Minute {
+		t.Fatalf("connectTimeoutFor = %s, want 3m", got)
+	}
+	if got := connectTimeoutFor(slowConnectAdapter{timeout: time.Second}); got != connectTimeout {
+		t.Fatalf("connectTimeoutFor = %s, want default %s", got, connectTimeout)
+	}
+}
+
+func TestFailedMongoConnectLeavesNothingToClose(t *testing.T) {
+	a, err := adapter.New("mongodb", adapter.Config{"uri": "mongodb://127.0.0.1:1/?serverSelectionTimeoutMS=200", "database": "k", "collection": "c"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
+	defer cancel()
+	if err := a.Connect(ctx); err == nil {
+		t.Fatal("want connect error")
+	}
+	if err := a.Close(ctx); err != nil {
+		t.Fatalf("Close after failed Connect = %v, want nil", err)
+	}
+}

service_name.go

@@ -61,23 +61,43 @@ func hostFromEndpoint(endpoint string) string {
 		return ""
 	}
 
+	// Never fall back to splitting arbitrary text: a malformed URL or a
+	// key=value DSN can carry a password, and the name is logged on every line.
 	if strings.Contains(endpoint, "://") {
 		if u, err := url.Parse(endpoint); err == nil {
-			if host := u.Hostname(); host != "" {
-				return host
-			}
+			return u.Hostname()
 		}
+		return ""
 	}
 
 	if host := hostFromMySQLDSN(endpoint); host != "" {
 		return host
 	}
 
-	host, _, err := net.SplitHostPort(endpoint)
-	if err == nil && host != "" {
-		return host
+	if strings.Contains(endpoint, "=") {
+		return hostFromKeyValueDSN(endpoint)
 	}
 
+	if strings.ContainsAny(endpoint, " \t@/") {
+		return ""
+	}
+	host, _, err := net.SplitHostPort(endpoint)
+	if err == nil {
+		return host
+	}
+	return ""
+}
+
+// hostFromKeyValueDSN reads host= from a PostgreSQL key=value DSN.
+func hostFromKeyValueDSN(dsn string) string {
+	for _, field := range strings.Fields(dsn) {
+		if value, ok := strings.CutPrefix(field, "host="); ok {
+			host := strings.Trim(value, "'")
+			// host may list several hosts; the first names the service.
+			host, _, _ = strings.Cut(host, ",")
+			return host
+		}
+	}
 	return ""
 }
 

service_name_test.go

@@ -0,0 +1,23 @@
+package main
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestHostFromEndpointNeverLeaksDSNSecrets(t *testing.T) {
+	for _, tc := range []struct{ in, want string }{
+		{"postgres://u:p@db.example.com:5432/k", "db.example.com"},
+		{"host=db.example.com user=u password=SeCrEt:x dbname=k", "db.example.com"},
+		{"host='db.example.com,db2.example.com' password=SeCrEt:x", "db.example.com"},
+		{"user=u password=SeCrEt:x dbname=k", ""},
+		{"postgres://u:SeCrEt%zz@db.example.com:5432/k", ""},
+		{"u:SeCrEt@tcp(db.example.com:3306)/k", "db.example.com"},
+		{"cache.example.com:6379", "cache.example.com"},
+	} {
+		got := hostFromEndpoint(tc.in)
+		if got != tc.want || strings.Contains(strings.ToLower(got), "secret") {
+			t.Errorf("hostFromEndpoint(%q) = %q, want %q", tc.in, got, tc.want)
+		}
+	}
+}