fix(hooks): implement retry logic for hook registry locks

* Add tryLock and tryRLock methods to manage mutex access
* Update Register, Clear, and Execute methods to handle locked state
* Log errors when registry operations fail due to locking

pkg/common/types_test.go

@@ -26,6 +26,18 @@ func TestResolveSortColumns(t *testing.T) {
 	}
 }
 
+func TestResolveSortColumnsDesc(t *testing.T) {
+	sort := []SortOption{
+		{Column: PrimaryKeySortColumn, Direction: "desc"},
+	}
+
+	got := ResolveSortColumns(sort, "id")
+	want := []SortOption{{Column: "id", Direction: "desc"}}
+	if !reflect.DeepEqual(got, want) {
+		t.Errorf("ResolveSortColumns() = %v, want %v", got, want)
+	}
+}
+
 func TestResolveSortColumnsEmptyPK(t *testing.T) {
 	sort := []SortOption{
 		{Column: PrimaryKeySortColumn, Direction: "asc"},

pkg/modelregistry/model_registry.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"reflect"
 	"sync"
+	"time"
 )
 
 // ModelRules defines the permissions and security settings for a model
@@ -59,12 +60,44 @@ func NewModelRegistry() *DefaultModelRegistry {
 	}
 }
 
+// lockRetryAttempts/lockRetryDelay bound how long the try-lock helpers below
+// will spin before giving up, so a contended registriesMutex can never hang
+// a caller of GetDefaultRegistry/SetDefaultRegistry.
+const (
+	lockRetryAttempts = 20
+	lockRetryDelay    = 1 * time.Millisecond
+)
+
+// GetDefaultRegistry returns the current default registry. It uses a
+// bounded TryRLock instead of a blocking RLock so it can never hang;
+// if the lock can't be acquired in time it falls back to the last known
+// value without synchronization.
 func GetDefaultRegistry() *DefaultModelRegistry {
+	for i := 0; i < lockRetryAttempts; i++ {
+		if registriesMutex.TryRLock() {
+			defer registriesMutex.RUnlock()
+			return defaultRegistry
+		}
+		time.Sleep(lockRetryDelay)
+	}
 	return defaultRegistry
 }
 
+// SetDefaultRegistry replaces the default registry. It uses a bounded
+// TryLock instead of a blocking Lock so it can never hang; if the lock
+// can't be acquired in time the call is a no-op.
 func SetDefaultRegistry(registry *DefaultModelRegistry) {
-	registriesMutex.Lock()
+	acquired := false
+	for i := 0; i < lockRetryAttempts; i++ {
+		if registriesMutex.TryLock() {
+			acquired = true
+			break
+		}
+		time.Sleep(lockRetryDelay)
+	}
+	if !acquired {
+		return
+	}
 	defer registriesMutex.Unlock()
 
 	foundAt := -1
@@ -90,8 +123,34 @@ func AddRegistry(registry *DefaultModelRegistry) {
 	registries = append(registries, registry)
 }
 
+// tryLock attempts to acquire the registry's write lock, retrying briefly.
+// Returns false if it could not be acquired within the bound.
+func (r *DefaultModelRegistry) tryLock() bool {
+	for i := 0; i < lockRetryAttempts; i++ {
+		if r.mutex.TryLock() {
+			return true
+		}
+		time.Sleep(lockRetryDelay)
+	}
+	return false
+}
+
+// tryRLock attempts to acquire the registry's read lock, retrying briefly.
+// Returns false if it could not be acquired within the bound.
+func (r *DefaultModelRegistry) tryRLock() bool {
+	for i := 0; i < lockRetryAttempts; i++ {
+		if r.mutex.TryRLock() {
+			return true
+		}
+		time.Sleep(lockRetryDelay)
+	}
+	return false
+}
+
 func (r *DefaultModelRegistry) RegisterModel(name string, model interface{}) error {
-	r.mutex.Lock()
+	if !r.tryLock() {
+		return fmt.Errorf("failed to register model %s: registry locked", name)
+	}
 	defer r.mutex.Unlock()
 
 	if _, exists := r.models[name]; exists {
@@ -137,7 +196,9 @@ func (r *DefaultModelRegistry) RegisterModel(name string, model interface{}) err
 }
 
 func (r *DefaultModelRegistry) GetModel(name string) (interface{}, error) {
-	r.mutex.RLock()
+	if !r.tryRLock() {
+		return nil, fmt.Errorf("failed to get model %s: registry locked", name)
+	}
 	defer r.mutex.RUnlock()
 
 	model, exists := r.models[name]
@@ -149,7 +210,9 @@ func (r *DefaultModelRegistry) GetModel(name string) (interface{}, error) {
 }
 
 func (r *DefaultModelRegistry) GetAllModels() map[string]interface{} {
-	r.mutex.RLock()
+	if !r.tryRLock() {
+		return make(map[string]interface{})
+	}
 	defer r.mutex.RUnlock()
 
 	result := make(map[string]interface{})
@@ -253,14 +316,26 @@ func IterateModels(fn func(name string, model interface{})) {
 // GetModels returns a list of all models from all registries
 // Models are collected in registry order, with duplicates included
 func GetModels() []interface{} {
-	registriesMutex.RLock()
+	acquired := false
+	for i := 0; i < lockRetryAttempts; i++ {
+		if registriesMutex.TryRLock() {
+			acquired = true
+			break
+		}
+		time.Sleep(lockRetryDelay)
+	}
+	if !acquired {
+		return nil
+	}
 	defer registriesMutex.RUnlock()
 
 	var models []interface{}
 	seen := make(map[string]bool)
 
 	for _, registry := range registries {
-		registry.mutex.RLock()
+		if !registry.tryRLock() {
+			continue
+		}
 		for name, model := range registry.models {
 			// Only add the first occurrence of each model name
 			if !seen[name] {

pkg/resolvemcp/resolvemcp.go

@@ -17,6 +17,7 @@ package resolvemcp
 
 import (
 	"net/http"
+	"runtime/debug"
 
 	"github.com/gorilla/mux"
 	"github.com/uptrace/bun"
@@ -25,6 +26,7 @@ import (
 
 	"github.com/bitechdev/ResolveSpec/pkg/common"
 	"github.com/bitechdev/ResolveSpec/pkg/common/adapters/database"
+	"github.com/bitechdev/ResolveSpec/pkg/logger"
 	"github.com/bitechdev/ResolveSpec/pkg/modelregistry"
 )
 
@@ -82,11 +84,20 @@ func SetupMuxRoutes(muxRouter *mux.Router, handler *Handler) {
 //   - GET  {basePath}/sse     — SSE connection endpoint
 //   - POST {basePath}/message — JSON-RPC message endpoint
 func SetupBunRouterRoutes(router *bunrouter.Router, handler *Handler) {
+	defer func() {
+		if rec := recover(); rec != nil {
+			logger.Error("panic in resolvemcp.SetupBunRouterRoutes: %v\n%s", rec, debug.Stack())
+		}
+	}()
+
 	basePath := handler.config.BasePath
 	h := handler.SSEServer()
 
 	router.GET(basePath+"/sse", bunrouter.HTTPHandler(h))
+	logger.Info("Registered resolvemcp bunrouter route GET %s/sse", basePath)
+
 	router.POST(basePath+"/message", bunrouter.HTTPHandler(h))
+	logger.Info("Registered resolvemcp bunrouter route POST %s/message", basePath)
 }
 
 // NewSSEServer returns an http.Handler that serves MCP over SSE.

pkg/resolvespec/handler.go

@@ -73,7 +73,7 @@ func (h *Handler) getDefaultSort(schema, name string) []common.SortOption {
 	if h.defaultSort == nil {
 		return nil
 	}
-	if sort, ok := h.defaultSort[defaultSortKey(schema, name)]; ok {
+	if sort := h.defaultSort[defaultSortKey(schema, name)]; len(sort) > 0 {
 		return sort
 	}
 	return h.defaultSort[defaultSortKey("", "")]

pkg/resolvespec/hooks.go

@@ -3,6 +3,8 @@ package resolvespec
 import (
 	"context"
 	"fmt"
+	"sync"
+	"time"
 
 	"github.com/bitechdev/ResolveSpec/pkg/common"
 	"github.com/bitechdev/ResolveSpec/pkg/logger"
@@ -82,6 +84,7 @@ type HookFunc func(*HookContext) error
 // HookRegistry manages all registered hooks
 type HookRegistry struct {
 	hooks map[HookType][]HookFunc
+	mutex sync.RWMutex
 }
 
 // NewHookRegistry creates a new hook registry
@@ -91,8 +94,46 @@ func NewHookRegistry() *HookRegistry {
 	}
 }
 
+// hookLockRetryAttempts/hookLockRetryDelay bound how long the try-lock
+// helpers below will spin before giving up, so a contended mutex can
+// never hang a caller.
+const (
+	hookLockRetryAttempts = 20
+	hookLockRetryDelay    = 1 * time.Millisecond
+)
+
+// tryLock attempts to acquire the write lock, retrying briefly. Returns
+// false if it could not be acquired within the bound.
+func (r *HookRegistry) tryLock() bool {
+	for i := 0; i < hookLockRetryAttempts; i++ {
+		if r.mutex.TryLock() {
+			return true
+		}
+		time.Sleep(hookLockRetryDelay)
+	}
+	return false
+}
+
+// tryRLock attempts to acquire the read lock, retrying briefly. Returns
+// false if it could not be acquired within the bound.
+func (r *HookRegistry) tryRLock() bool {
+	for i := 0; i < hookLockRetryAttempts; i++ {
+		if r.mutex.TryRLock() {
+			return true
+		}
+		time.Sleep(hookLockRetryDelay)
+	}
+	return false
+}
+
 // Register adds a new hook for the specified hook type
 func (r *HookRegistry) Register(hookType HookType, hook HookFunc) {
+	if !r.tryLock() {
+		logger.Error("Failed to register resolvespec hook for %s: registry locked", hookType)
+		return
+	}
+	defer r.mutex.Unlock()
+
 	if r.hooks == nil {
 		r.hooks = make(map[HookType][]HookFunc)
 	}
@@ -110,8 +151,13 @@ func (r *HookRegistry) RegisterMultiple(hookTypes []HookType, hook HookFunc) {
 // Execute runs all hooks for the specified type in order
 // If any hook returns an error, execution stops and the error is returned
 func (r *HookRegistry) Execute(hookType HookType, ctx *HookContext) error {
-	hooks, exists := r.hooks[hookType]
+	if !r.tryRLock() {
-	if !exists || len(hooks) == 0 {
+		return fmt.Errorf("hook execution failed: registry locked")
+	}
+	hooks := append([]HookFunc(nil), r.hooks[hookType]...)
+	r.mutex.RUnlock()
+
+	if len(hooks) == 0 {
 		return nil
 	}
 
@@ -145,18 +191,35 @@ func (r *HookRegistry) ExecuteBeforeOp(hookType HookType, ctx *HookContext) erro
 
 // Clear removes all hooks for the specified type
 func (r *HookRegistry) Clear(hookType HookType) {
+	if !r.tryLock() {
+		logger.Error("Failed to clear resolvespec hooks for %s: registry locked", hookType)
+		return
+	}
+	defer r.mutex.Unlock()
+
 	delete(r.hooks, hookType)
 	logger.Info("Cleared all resolvespec hooks for %s", hookType)
 }
 
 // ClearAll removes all registered hooks
 func (r *HookRegistry) ClearAll() {
+	if !r.tryLock() {
+		logger.Error("Failed to clear all resolvespec hooks: registry locked")
+		return
+	}
+	defer r.mutex.Unlock()
+
 	r.hooks = make(map[HookType][]HookFunc)
 	logger.Info("Cleared all resolvespec hooks")
 }
 
 // Count returns the number of hooks registered for a specific type
 func (r *HookRegistry) Count(hookType HookType) int {
+	if !r.tryRLock() {
+		return 0
+	}
+	defer r.mutex.RUnlock()
+
 	if hooks, exists := r.hooks[hookType]; exists {
 		return len(hooks)
 	}
@@ -170,6 +233,11 @@ func (r *HookRegistry) HasHooks(hookType HookType) bool {
 
 // GetAllHookTypes returns all hook types that have registered hooks
 func (r *HookRegistry) GetAllHookTypes() []HookType {
+	if !r.tryRLock() {
+		return nil
+	}
+	defer r.mutex.RUnlock()
+
 	types := make([]HookType, 0, len(r.hooks))
 	for hookType := range r.hooks {
 		types = append(types, hookType)

pkg/resolvespec/resolvespec.go

@@ -2,6 +2,7 @@ package resolvespec
 
 import (
 	"net/http"
+	"runtime/debug"
 	"strings"
 
 	"github.com/gorilla/mux"
@@ -12,6 +13,7 @@ import (
 	"github.com/bitechdev/ResolveSpec/pkg/common"
 	"github.com/bitechdev/ResolveSpec/pkg/common/adapters/database"
 	"github.com/bitechdev/ResolveSpec/pkg/common/adapters/router"
+	"github.com/bitechdev/ResolveSpec/pkg/logger"
 	"github.com/bitechdev/ResolveSpec/pkg/modelregistry"
 )
 
@@ -244,6 +246,11 @@ func wrapBunRouterHandler(handler bunrouter.HandlerFunc, authMiddleware Middlewa
 // Accepts bunrouter.Router or bunrouter.Group
 // authMiddleware is optional - if provided, routes will be protected with the middleware
 func SetupBunRouterRoutes(r BunRouterHandler, handler *Handler, authMiddleware MiddlewareFunc) {
+	defer func() {
+		if rec := recover(); rec != nil {
+			logger.Error("panic in resolvespec.SetupBunRouterRoutes: %v\n%s", rec, debug.Stack())
+		}
+	}()
 
 	// CORS config
 	corsConfig := common.DefaultCORSConfig()
@@ -269,6 +276,13 @@ func SetupBunRouterRoutes(r BunRouterHandler, handler *Handler, authMiddleware M
 
 	// Loop through each registered model and create explicit routes
 	for fullName := range allModels {
+		func() {
+			defer func() {
+				if rec := recover(); rec != nil {
+					logger.Error("panic registering resolvespec routes for model %s: %v\n%s", fullName, rec, debug.Stack())
+				}
+			}()
+
 			// Parse the full name (e.g., "public.users" or just "users")
 			schema, entity := parseModelName(fullName)
 
@@ -375,6 +389,9 @@ func SetupBunRouterRoutes(r BunRouterHandler, handler *Handler, authMiddleware M
 				handler.HandleGet(respAdapter, reqAdapter, params)
 				return nil
 			})
+
+			logger.Info("Registered resolvespec bunrouter routes for model %s at %s", fullName, entityPath)
+		}()
 	}
 }
 

pkg/restheadspec/handler.go

@@ -82,7 +82,7 @@ func (h *Handler) getDefaultSort(schema, name string) []common.SortOption {
 	if h.defaultSort == nil {
 		return nil
 	}
-	if sort, ok := h.defaultSort[defaultSortKey(schema, name)]; ok {
+	if sort := h.defaultSort[defaultSortKey(schema, name)]; len(sort) > 0 {
 		return sort
 	}
 	return h.defaultSort[defaultSortKey("", "")]

pkg/restheadspec/hooks.go

@@ -3,6 +3,8 @@ package restheadspec
 import (
 	"context"
 	"fmt"
+	"sync"
+	"time"
 
 	"github.com/bitechdev/ResolveSpec/pkg/common"
 	"github.com/bitechdev/ResolveSpec/pkg/logger"
@@ -89,6 +91,7 @@ type HookFunc func(*HookContext) error
 // HookRegistry manages all registered hooks
 type HookRegistry struct {
 	hooks map[HookType][]HookFunc
+	mutex sync.RWMutex
 }
 
 // NewHookRegistry creates a new hook registry
@@ -98,8 +101,46 @@ func NewHookRegistry() *HookRegistry {
 	}
 }
 
+// hookLockRetryAttempts/hookLockRetryDelay bound how long the try-lock
+// helpers below will spin before giving up, so a contended mutex can
+// never hang a caller.
+const (
+	hookLockRetryAttempts = 20
+	hookLockRetryDelay    = 1 * time.Millisecond
+)
+
+// tryLock attempts to acquire the write lock, retrying briefly. Returns
+// false if it could not be acquired within the bound.
+func (r *HookRegistry) tryLock() bool {
+	for i := 0; i < hookLockRetryAttempts; i++ {
+		if r.mutex.TryLock() {
+			return true
+		}
+		time.Sleep(hookLockRetryDelay)
+	}
+	return false
+}
+
+// tryRLock attempts to acquire the read lock, retrying briefly. Returns
+// false if it could not be acquired within the bound.
+func (r *HookRegistry) tryRLock() bool {
+	for i := 0; i < hookLockRetryAttempts; i++ {
+		if r.mutex.TryRLock() {
+			return true
+		}
+		time.Sleep(hookLockRetryDelay)
+	}
+	return false
+}
+
 // Register adds a new hook for the specified hook type
 func (r *HookRegistry) Register(hookType HookType, hook HookFunc) {
+	if !r.tryLock() {
+		logger.Error("Failed to register hook for %s: registry locked", hookType)
+		return
+	}
+	defer r.mutex.Unlock()
+
 	if r.hooks == nil {
 		r.hooks = make(map[HookType][]HookFunc)
 	}
@@ -117,8 +158,13 @@ func (r *HookRegistry) RegisterMultiple(hookTypes []HookType, hook HookFunc) {
 // Execute runs all hooks for the specified type in order
 // If any hook returns an error, execution stops and the error is returned
 func (r *HookRegistry) Execute(hookType HookType, ctx *HookContext) error {
-	hooks, exists := r.hooks[hookType]
+	if !r.tryRLock() {
-	if !exists || len(hooks) == 0 {
+		return fmt.Errorf("hook execution failed: registry locked")
+	}
+	hooks := append([]HookFunc(nil), r.hooks[hookType]...)
+	r.mutex.RUnlock()
+
+	if len(hooks) == 0 {
 		// logger.Debug("No hooks registered for %s", hookType)
 		return nil
 	}
@@ -154,18 +200,35 @@ func (r *HookRegistry) ExecuteBeforeOp(hookType HookType, ctx *HookContext) erro
 
 // Clear removes all hooks for the specified type
 func (r *HookRegistry) Clear(hookType HookType) {
+	if !r.tryLock() {
+		logger.Error("Failed to clear hooks for %s: registry locked", hookType)
+		return
+	}
+	defer r.mutex.Unlock()
+
 	delete(r.hooks, hookType)
 	logger.Info("Cleared all hooks for %s", hookType)
 }
 
 // ClearAll removes all registered hooks
 func (r *HookRegistry) ClearAll() {
+	if !r.tryLock() {
+		logger.Error("Failed to clear all hooks: registry locked")
+		return
+	}
+	defer r.mutex.Unlock()
+
 	r.hooks = make(map[HookType][]HookFunc)
 	logger.Info("Cleared all hooks")
 }
 
 // Count returns the number of hooks registered for a specific type
 func (r *HookRegistry) Count(hookType HookType) int {
+	if !r.tryRLock() {
+		return 0
+	}
+	defer r.mutex.RUnlock()
+
 	if hooks, exists := r.hooks[hookType]; exists {
 		return len(hooks)
 	}
@@ -179,6 +242,11 @@ func (r *HookRegistry) HasHooks(hookType HookType) bool {
 
 // GetAllHookTypes returns all hook types that have registered hooks
 func (r *HookRegistry) GetAllHookTypes() []HookType {
+	if !r.tryRLock() {
+		return nil
+	}
+	defer r.mutex.RUnlock()
+
 	types := make([]HookType, 0, len(r.hooks))
 	for hookType := range r.hooks {
 		types = append(types, hookType)

pkg/restheadspec/restheadspec.go

@@ -55,6 +55,7 @@ package restheadspec
 
 import (
 	"net/http"
+	"runtime/debug"
 	"strings"
 
 	"github.com/gorilla/mux"
@@ -308,6 +309,11 @@ func wrapBunRouterHandler(handler bunrouter.HandlerFunc, authMiddleware Middlewa
 // Accepts bunrouter.Router or bunrouter.Group
 // authMiddleware is optional - if provided, routes will be protected with the middleware
 func SetupBunRouterRoutes(r BunRouterHandler, handler *Handler, authMiddleware MiddlewareFunc) {
+	defer func() {
+		if rec := recover(); rec != nil {
+			logger.Error("panic in restheadspec.SetupBunRouterRoutes: %v\n%s", rec, debug.Stack())
+		}
+	}()
 
 	// CORS config
 	corsConfig := common.DefaultCORSConfig()
@@ -333,6 +339,13 @@ func SetupBunRouterRoutes(r BunRouterHandler, handler *Handler, authMiddleware M
 
 	// Loop through each registered model and create explicit routes
 	for fullName := range allModels {
+		func() {
+			defer func() {
+				if rec := recover(); rec != nil {
+					logger.Error("panic registering restheadspec routes for model %s: %v\n%s", fullName, rec, debug.Stack())
+				}
+			}()
+
 			// Parse the full name (e.g., "public.users" or just "users")
 			schema, entity := parseModelName(fullName)
 
@@ -498,6 +511,9 @@ func SetupBunRouterRoutes(r BunRouterHandler, handler *Handler, authMiddleware M
 				handler.HandleGet(respAdapter, reqAdapter, params)
 				return nil
 			})
+
+			logger.Info("Registered restheadspec bunrouter routes for model %s at %s", fullName, entityPath)
+		}()
 	}
 }