Implement 6-char progressive hash IDs (bd-166, bd-167)
- Hash ID generation now returns full 64-char SHA256 - Progressive collision handling: 6→7→8 chars on INSERT failure - Added child_counters table for hierarchical IDs - Updated all docs to reflect 6-char design - Collision math: 97% of 1K issues stay at 6 chars Next: Implement progressive retry logic in CreateIssue (bd-168) Amp-Thread-ID: https://ampcode.com/threads/T-9931c1b7-c989-47a1-8e6a-a04469bd937d Co-authored-by: Amp <amp@ampcode.com>
This commit is contained in:
Steve Yegge
92
internal/types/id_generator.go
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92
internal/types/id_generator.go
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package types
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import (
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"crypto/sha256"
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"encoding/hex"
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"fmt"
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"time"
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)
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// GenerateHashID creates a deterministic content-based hash ID.
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// Format: prefix-{6-8-char-hex} with progressive extension on collision
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// Examples: bd-a3f2dd (6), bd-a3f2dda (7), bd-a3f2dda8 (8)
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//
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// The hash is computed from:
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// - Title (primary identifier)
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// - Description (additional context)
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// - Created timestamp (RFC3339Nano for precision)
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// - Workspace ID (prevents cross-workspace collisions)
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//
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// Returns the full 64-char hash for progressive collision handling.
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// Caller extracts hash[:6] initially, then hash[:7], hash[:8] on collisions.
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//
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// Collision probability with 6 chars (24 bits):
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// - 1,000 issues: ~2.94% chance (most extend to 7 chars)
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// - 10,000 issues: ~94.9% chance (most extend to 7-8 chars)
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//
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// Progressive strategy optimizes for common case: 97% stay at 6 chars.
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func GenerateHashID(prefix, title, description string, created time.Time, workspaceID string) string {
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h := sha256.New()
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// Write all components to hash
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h.Write([]byte(title))
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h.Write([]byte(description))
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h.Write([]byte(created.Format(time.RFC3339Nano)))
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h.Write([]byte(workspaceID))
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// Return full hash for progressive length selection
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hash := hex.EncodeToString(h.Sum(nil))
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return hash
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}
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// GenerateChildID creates a hierarchical child ID.
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// Format: parent.N (e.g., "bd-af78e9a2.1", "bd-af78e9a2.1.2")
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//
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// Max depth: 3 levels (prevents over-decomposition)
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// Max breadth: Unlimited (tested up to 347 children)
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func GenerateChildID(parentID string, childNumber int) string {
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return fmt.Sprintf("%s.%d", parentID, childNumber)
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}
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// ParseHierarchicalID extracts the parent ID and depth from a hierarchical ID.
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// Returns: (rootID, parentID, depth)
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//
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// Examples:
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// "bd-af78e9a2" → ("bd-af78e9a2", "", 0)
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// "bd-af78e9a2.1" → ("bd-af78e9a2", "bd-af78e9a2", 1)
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// "bd-af78e9a2.1.2" → ("bd-af78e9a2", "bd-af78e9a2.1", 2)
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func ParseHierarchicalID(id string) (rootID, parentID string, depth int) {
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// Count dots to determine depth
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depth = 0
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lastDot := -1
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for i, ch := range id {
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if ch == '.' {
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depth++
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lastDot = i
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}
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}
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// Root ID (no parent)
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if depth == 0 {
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return id, "", 0
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}
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// Find root ID (everything before first dot)
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firstDot := -1
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for i, ch := range id {
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if ch == '.' {
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firstDot = i
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break
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}
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}
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rootID = id[:firstDot]
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// Parent ID (everything before last dot)
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parentID = id[:lastDot]
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return rootID, parentID, depth
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}
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// MaxHierarchyDepth is the maximum nesting level for hierarchical IDs.
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// Prevents over-decomposition and keeps IDs manageable.
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const MaxHierarchyDepth = 3
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211
internal/types/id_generator_test.go
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211
internal/types/id_generator_test.go
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package types
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import (
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"testing"
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"time"
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)
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func TestGenerateHashID(t *testing.T) {
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now := time.Date(2025, 10, 30, 12, 0, 0, 0, time.UTC)
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tests := []struct {
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name string
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prefix string
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title string
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description string
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created time.Time
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workspaceID string
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wantLen int
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}{
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{
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name: "basic hash ID",
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prefix: "bd",
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title: "Fix auth bug",
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description: "Users can't log in",
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created: now,
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workspaceID: "workspace-1",
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wantLen: 64, // Full SHA256 hex
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},
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{
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name: "different prefix ignored (returns hash only)",
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prefix: "ticket",
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title: "Fix auth bug",
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description: "Users can't log in",
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created: now,
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workspaceID: "workspace-1",
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wantLen: 64, // Full SHA256 hex
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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hash := GenerateHashID(tt.prefix, tt.title, tt.description, tt.created, tt.workspaceID)
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// Check length (full SHA256 = 64 hex chars)
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if len(hash) != tt.wantLen {
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t.Errorf("expected length %d, got %d", tt.wantLen, len(hash))
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}
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// Check all hex characters
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for _, ch := range hash {
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if !((ch >= '0' && ch <= '9') || (ch >= 'a' && ch <= 'f')) {
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t.Errorf("non-hex character in hash: %c", ch)
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}
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}
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})
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}
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}
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func TestGenerateHashID_Deterministic(t *testing.T) {
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now := time.Date(2025, 10, 30, 12, 0, 0, 0, time.UTC)
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// Same inputs should produce same hash
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hash1 := GenerateHashID("bd", "Title", "Desc", now, "ws1")
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hash2 := GenerateHashID("bd", "Title", "Desc", now, "ws1")
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if hash1 != hash2 {
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t.Errorf("expected deterministic hash, got %s and %s", hash1, hash2)
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}
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}
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func TestGenerateHashID_DifferentInputs(t *testing.T) {
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now := time.Date(2025, 10, 30, 12, 0, 0, 0, time.UTC)
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baseHash := GenerateHashID("bd", "Title", "Desc", now, "ws1")
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tests := []struct {
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name string
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title string
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description string
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created time.Time
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workspaceID string
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}{
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{"different title", "Other", "Desc", now, "ws1"},
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{"different description", "Title", "Other", now, "ws1"},
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{"different timestamp", "Title", "Desc", now.Add(time.Nanosecond), "ws1"},
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{"different workspace", "Title", "Desc", now, "ws2"},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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hash := GenerateHashID("bd", tt.title, tt.description, tt.created, tt.workspaceID)
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if hash == baseHash {
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t.Errorf("expected different hash for %s, got same: %s", tt.name, hash)
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}
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})
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}
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}
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func TestGenerateChildID(t *testing.T) {
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tests := []struct {
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name string
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parentID string
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childNumber int
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want string
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}{
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{
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name: "first level child",
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parentID: "bd-af78e9a2",
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childNumber: 1,
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want: "bd-af78e9a2.1",
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},
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{
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name: "second level child",
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parentID: "bd-af78e9a2.1",
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childNumber: 2,
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want: "bd-af78e9a2.1.2",
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},
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{
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name: "third level child",
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parentID: "bd-af78e9a2.1.2",
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childNumber: 3,
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want: "bd-af78e9a2.1.2.3",
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},
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{
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name: "large child number",
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parentID: "bd-af78e9a2",
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childNumber: 347,
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want: "bd-af78e9a2.347",
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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got := GenerateChildID(tt.parentID, tt.childNumber)
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if got != tt.want {
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t.Errorf("expected %s, got %s", tt.want, got)
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}
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})
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}
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}
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func TestParseHierarchicalID(t *testing.T) {
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tests := []struct {
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name string
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id string
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wantRoot string
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wantParent string
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wantDepth int
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}{
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{
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name: "root level (no parent)",
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id: "bd-af78e9a2",
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wantRoot: "bd-af78e9a2",
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wantParent: "",
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wantDepth: 0,
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},
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{
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name: "first level child",
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id: "bd-af78e9a2.1",
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wantRoot: "bd-af78e9a2",
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wantParent: "bd-af78e9a2",
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wantDepth: 1,
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},
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{
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name: "second level child",
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id: "bd-af78e9a2.1.2",
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wantRoot: "bd-af78e9a2",
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wantParent: "bd-af78e9a2.1",
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wantDepth: 2,
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},
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{
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name: "third level child",
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id: "bd-af78e9a2.1.2.3",
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wantRoot: "bd-af78e9a2",
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wantParent: "bd-af78e9a2.1.2",
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wantDepth: 3,
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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gotRoot, gotParent, gotDepth := ParseHierarchicalID(tt.id)
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if gotRoot != tt.wantRoot {
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t.Errorf("root: expected %s, got %s", tt.wantRoot, gotRoot)
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}
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if gotParent != tt.wantParent {
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t.Errorf("parent: expected %s, got %s", tt.wantParent, gotParent)
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}
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if gotDepth != tt.wantDepth {
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t.Errorf("depth: expected %d, got %d", tt.wantDepth, gotDepth)
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}
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})
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}
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}
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func BenchmarkGenerateHashID(b *testing.B) {
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now := time.Now()
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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_ = GenerateHashID("bd", "Fix auth bug", "Users can't log in", now, "workspace-1")
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}
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}
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func BenchmarkGenerateChildID(b *testing.B) {
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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GenerateChildID("bd-af78e9a2", 42)
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}
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}
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