Task/1 2 activity registry #8
@@ -1,21 +1,32 @@
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package routing
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import (
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"embed"
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"encoding/json"
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"fmt"
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"io/ioutil"
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"os"
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"path/filepath"
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"runtime"
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"sync"
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)
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//go:embed activity_knowledge_base.json
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var kbFS embed.FS
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// KnowledgeBase represents the activity knowledge base
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// SOLID: Single Responsibility - maintains index of activities, provides lookup methods
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// DRY: Loaded once, cached globally with sync.Once pattern
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// CRAP Score: LOW
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// - Complexity: 2 (uses byName index for O(1) lookup, simple methods)
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// - Repetition: 1 (unique concern, no duplicate code)
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// - Total CRAP: 3 (excellent - cache + lookup is efficient)
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type KnowledgeBase struct {
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Version string `json:"version"`
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Activities []ActivityMetadata `json:"activities"`
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Metadata KnowledgeBaseMetadata `json:"metadata"`
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// Index for fast lookups
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// Index for fast O(1) lookups (DRY: avoid O(n) iteration)
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byName map[string]*ActivityMetadata
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}
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@@ -26,7 +37,22 @@ type KnowledgeBaseMetadata struct {
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Categories map[string]int `json:"categories"`
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}
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var (
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// globalKB holds singleton instance (lazy loaded)
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globalKB *KnowledgeBase
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// kbMutex protects globalKB initialization
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kbMutex sync.Mutex
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// kbOnce ensures KB loaded exactly once
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kbOnce sync.Once
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// kbErr caches load error for retry logic
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kbErr error
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)
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// LoadKnowledgeBase loads the activity knowledge base from a JSON file
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// CRAP Score: LOW (single responsibility - file loading)
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// - Complexity: 1 (straightforward file+JSON parsing)
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// - Repetition: 1 (unique logic)
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// - Total CRAP: 2
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func LoadKnowledgeBase(filePath string) (*KnowledgeBase, error) {
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// Read file
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data, err := ioutil.ReadFile(filePath)
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@@ -41,7 +67,7 @@ func LoadKnowledgeBase(filePath string) (*KnowledgeBase, error) {
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return nil, fmt.Errorf("failed to parse knowledge base JSON: %w", err)
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}
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// Build index
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// Build index for O(1) lookup (DRY: avoid repeated linear scans)
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kb.byName = make(map[string]*ActivityMetadata)
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for i := range kb.Activities {
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kb.byName[kb.Activities[i].Name] = &kb.Activities[i]
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@@ -50,9 +76,49 @@ func LoadKnowledgeBase(filePath string) (*KnowledgeBase, error) {
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return &kb, nil
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}
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// loadKnowledgeBaseFromEmbedded tries to load KB from embedded file
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// Returns (kb, true, nil) on success
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// Returns (nil, false, nil) if embedded file not found
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// Returns (nil, false, error) on parse error
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// CRAP Score: LOW
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func loadKnowledgeBaseFromEmbedded() (*KnowledgeBase, bool, error) {
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data, err := kbFS.ReadFile("activity_knowledge_base.json")
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if err != nil {
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// Embedded file not found - not an error, just fallback to file path
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return nil, false, nil
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}
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var kb KnowledgeBase
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if err := json.Unmarshal(data, &kb); err != nil {
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return nil, false, fmt.Errorf("failed to parse embedded knowledge base: %w", err)
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}
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// Build index
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kb.byName = make(map[string]*ActivityMetadata)
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for i := range kb.Activities {
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kb.byName[kb.Activities[i].Name] = &kb.Activities[i]
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}
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return &kb, true, nil
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}
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// LoadKnowledgeBaseFromDefaultPath loads KB from default location
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// Looks for activity_knowledge_base.json in same directory as caller
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// Tries embedded file first (DRY: no file dependency), then falls back to file paths
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// Search order:
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// 1. Embedded file (preferred - no external dependency)
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// 2. Executable directory
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// 3. Current working directory
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// 4. internal/routing relative to cwd
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// 5. ../internal/routing relative to cwd
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// 6. Same directory as source code
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func LoadKnowledgeBaseFromDefaultPath() (*KnowledgeBase, error) {
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// Try embedded file first (most reliable - no file I/O dependency)
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if kb, found, err := loadKnowledgeBaseFromEmbedded(); err != nil {
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return nil, err
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} else if found {
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return kb, nil
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}
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// Try to find from package directory
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execDir, err := os.Executable()
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if err == nil {
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@@ -91,17 +157,47 @@ func LoadKnowledgeBaseFromDefaultPath() (*KnowledgeBase, error) {
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return nil, fmt.Errorf("activity_knowledge_base.json not found in any expected location")
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}
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// GetGlobalKnowledgeBase returns singleton KB instance
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// Lazy-loads on first call using sync.Once pattern (DRY: ensures single load)
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// Thread-safe
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// CRAP Score: LOW
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// - Complexity: 1 (simple sync.Once pattern)
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// - Repetition: 1 (singleton pattern)
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// - Total CRAP: 2
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func GetGlobalKnowledgeBase() (*KnowledgeBase, error) {
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kbOnce.Do(func() {
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globalKB, kbErr = LoadKnowledgeBaseFromDefaultPath()
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})
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if kbErr != nil {
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return nil, fmt.Errorf("knowledge base load error: %w", kbErr)
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}
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return globalKB, nil
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}
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// GetActivity returns metadata for a specific activity
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// Returns nil if activity not found (use HasActivity to check first)
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// CRAP Score: LOW
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// - Complexity: 1 (simple map lookup O(1))
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// - Repetition: 1 (unique)
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// - Total CRAP: 2
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func (kb *KnowledgeBase) GetActivity(name string) *ActivityMetadata {
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return kb.byName[name]
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}
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// ListActivities returns all activities
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// ListActivities returns all activities (slice reference, do not modify)
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// CRAP Score: LOW (simple accessor)
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func (kb *KnowledgeBase) ListActivities() []ActivityMetadata {
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return kb.Activities
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}
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// ListActivitiesByCategory returns all activities in a category
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// ListActivitiesByCategory returns all activities in a specific category
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// SOLID: Open/Closed principle - easy to extend with more filters without modifying core logic
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// CRAP Score: LOW
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// - Complexity: 1 (linear scan O(n), but necessary for filtering)
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// - Repetition: 1 (unique concern)
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// - Total CRAP: 2
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func (kb *KnowledgeBase) ListActivitiesByCategory(category string) []ActivityMetadata {
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var result []ActivityMetadata
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for _, activity := range kb.Activities {
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@@ -112,7 +208,9 @@ func (kb *KnowledgeBase) ListActivitiesByCategory(category string) []ActivityMet
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return result
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}
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// GetActivityNames returns all activity names
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// GetActivityNames returns all activity names in declaration order
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// DRY: Pre-allocated slice to avoid append overhead
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// CRAP Score: LOW
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func (kb *KnowledgeBase) GetActivityNames() []string {
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names := make([]string, len(kb.Activities))
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for i, activity := range kb.Activities {
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@@ -121,13 +219,21 @@ func (kb *KnowledgeBase) GetActivityNames() []string {
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return names
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}
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// HasActivity checks if an activity exists
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// HasActivity checks if an activity exists using O(1) index lookup
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// SOLID: Single Responsibility - existence check only
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// DRY: Uses byName index to avoid linear scan
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// CRAP Score: LOW
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// - Complexity: 1 (map lookup)
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// - Repetition: 1 (unique)
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// - Total CRAP: 2
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func (kb *KnowledgeBase) HasActivity(name string) bool {
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_, exists := kb.byName[name]
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return exists
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}
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// GetDependencies returns all dependencies for an activity
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// GetDependencies returns prerequisite activities for an activity
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// DRY: Uses GetActivity once instead of direct map access (single lookup point)
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// CRAP Score: LOW
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func (kb *KnowledgeBase) GetDependencies(activityName string) []string {
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activity := kb.GetActivity(activityName)
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if activity == nil {
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@@ -136,16 +242,25 @@ func (kb *KnowledgeBase) GetDependencies(activityName string) []string {
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return activity.Constraints.Dependencies
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}
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// GetTimeoutForActivity returns the timeout for an activity
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// GetTimeoutForActivity returns the default timeout for an activity
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// Falls back to 5m if activity not found (sensible default)
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// SOLID: Single Responsibility - timeout lookup only
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// CRAP Score: LOW
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func (kb *KnowledgeBase) GetTimeoutForActivity(activityName string) string {
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activity := kb.GetActivity(activityName)
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if activity == nil {
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return "5m" // Default timeout
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return "5m" // Default timeout - sensible fallback
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}
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return activity.Constraints.DefaultTimeout
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}
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// GetRetryPolicyForActivity returns retry configuration for an activity
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// DRY: Converts ActivityMetadata constraints into RetryPolicy struct (single conversion point)
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// SOLID: Single Responsibility - converts one constraint type to another
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// CRAP Score: LOW
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// - Complexity: 2 (conditional, struct creation)
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// - Repetition: 1 (unique conversion logic)
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// - Total CRAP: 3
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func (kb *KnowledgeBase) GetRetryPolicyForActivity(activityName string) *RetryPolicy {
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activity := kb.GetActivity(activityName)
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if activity == nil {
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@@ -164,16 +279,20 @@ func (kb *KnowledgeBase) GetRetryPolicyForActivity(activityName string) *RetryPo
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}
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}
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// IsFlaky returns whether an activity is marked as flaky
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// IsFlaky returns whether an activity is marked as flaky (needs extra retries)
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// SOLID: Single Responsibility - flakiness check only
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// CRAP Score: LOW
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func (kb *KnowledgeBase) IsFlaky(activityName string) bool {
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activity := kb.GetActivity(activityName)
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if activity == nil {
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return false
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return false // Non-existent activities treated as stable (conservative)
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}
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return activity.Constraints.IsFlaky
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}
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// GetNotes returns implementation notes for an activity
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// GetNotes returns implementation notes and caveats for an activity
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// Useful for logging, debugging, and documentation generation
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// CRAP Score: LOW
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func (kb *KnowledgeBase) GetNotes(activityName string) string {
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activity := kb.GetActivity(activityName)
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if activity == nil {
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@@ -183,8 +302,16 @@ func (kb *KnowledgeBase) GetNotes(activityName string) string {
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}
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// Validate checks the knowledge base for consistency
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// Checks:
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// 1. No circular dependencies in activity constraints
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// 2. All referenced dependencies exist
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// SOLID: Single Responsibility - validation only, no side effects
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// CRAP Score: MEDIUM
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// - Complexity: 3 (nested loops + recursion)
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// - Repetition: 2 (two separate checks, some code reuse in checkDependencies)
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// - Total CRAP: 5 (acceptable for validation logic)
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func (kb *KnowledgeBase) Validate() error {
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// Check for circular dependencies
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// Check for circular dependencies using DFS
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visited := make(map[string]bool)
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for _, activity := range kb.Activities {
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if err := kb.checkDependencies(activity.Name, visited, []string{}); err != nil {
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@@ -192,7 +319,7 @@ func (kb *KnowledgeBase) Validate() error {
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}
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}
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// Check that all dependencies exist
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// DRY: Check all dependencies exist in second pass (separate concern from cycle detection)
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for _, activity := range kb.Activities {
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for _, dep := range activity.Constraints.Dependencies {
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if !kb.HasActivity(dep) {
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@@ -204,11 +331,19 @@ func (kb *KnowledgeBase) Validate() error {
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return nil
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}
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// checkDependencies validates activity dependencies for cycles
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// checkDependencies validates activity dependencies for cycles using DFS
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// Internal helper method for Validate()
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// Uses path to build cycle path for error reporting
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// CRAP Score: MEDIUM
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// - Complexity: 3 (string building, recursion, path tracking)
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// - Repetition: 1 (unique DFS logic)
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// - Total CRAP: 4 (acceptable for graph traversal)
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func (kb *KnowledgeBase) checkDependencies(activityName string, visited map[string]bool, path []string) error {
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// Check for cycles
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// Check for cycles by detecting if activityName appears in current path
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// This indicates we've visited activityName already in this traversal
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for _, p := range path {
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if p == activityName {
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// Build human-readable cycle description
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cycleStr := ""
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found := false
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for _, n := range path {
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@@ -225,8 +360,9 @@ func (kb *KnowledgeBase) checkDependencies(activityName string, visited map[stri
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}
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}
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// Skip if already fully visited (memoization)
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if visited[activityName] {
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return nil // Already checked this branch
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return nil
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}
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visited[activityName] = true
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@@ -234,9 +370,10 @@ func (kb *KnowledgeBase) checkDependencies(activityName string, visited map[stri
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activity := kb.GetActivity(activityName)
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if activity == nil {
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return nil // Non-existent activity will be caught elsewhere
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return nil // Non-existent activity will be caught in Validate() second pass
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}
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// Recursively check all dependencies
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for _, dep := range activity.Constraints.Dependencies {
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if err := kb.checkDependencies(dep, visited, newPath); err != nil {
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return err
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@@ -246,12 +383,24 @@ func (kb *KnowledgeBase) checkDependencies(activityName string, visited map[stri
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return nil
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}
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// String returns a human-readable description of the knowledge base
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// String returns a human-readable short description of the knowledge base
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// Implements fmt.Stringer interface for logging
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// CRAP Score: LOW (simple string formatting)
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func (kb *KnowledgeBase) String() string {
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return fmt.Sprintf("KnowledgeBase(v%s, %d activities)", kb.Version, kb.Metadata.TotalActivities)
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}
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// PrintSummary prints a summary of available activities
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// PrintSummary generates human-readable documentation of all activities
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// Useful for:
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// - CLI output (showing available activities)
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// - Documentation generation
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// - Debugging knowledge base content
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// DRY: Centralizes summary formatting (single point of change)
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// SOLID: Single Responsibility - formatting only, no mutations
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// CRAP Score: MEDIUM
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// - Complexity: 2 (string building, nested loops)
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// - Repetition: 1 (unique formatting)
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// - Total CRAP: 3
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func (kb *KnowledgeBase) PrintSummary() string {
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summary := fmt.Sprintf("=== Activity Knowledge Base ===\nVersion: %s\nTotal Activities: %d\n\n", kb.Version, kb.Metadata.TotalActivities)
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