Add Discord outbound posting.

internal/discord/memory_links.go

@@ -0,0 +1,88 @@
+package discord
+
+import (
+	"context"
+	"database/sql"
+	"strings"
+	"sync"
+	"time"
+
+	"plumber/internal/store"
+)
+
+// memoryLinks is an in-process DiscordLinkStore for tests.
+type memoryLinks struct {
+	mu        sync.Mutex
+	byPost    map[string]store.DiscordLink
+	byMessage map[string]string
+	byThread  map[string]string
+}
+
+func newMemoryLinks() *memoryLinks {
+	return &memoryLinks{
+		byPost:    map[string]store.DiscordLink{},
+		byMessage: map[string]string{},
+		byThread:  map[string]string{},
+	}
+}
+
+func (m *memoryLinks) GetByPostID(_ context.Context, postID string) (*store.DiscordLink, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	link, ok := m.byPost[strings.TrimSpace(postID)]
+	if !ok {
+		return nil, sql.ErrNoRows
+	}
+	cp := link
+	return &cp, nil
+}
+
+func (m *memoryLinks) GetByMessageID(_ context.Context, messageID string) (*store.DiscordLink, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	postID, ok := m.byMessage[strings.TrimSpace(messageID)]
+	if !ok {
+		return nil, sql.ErrNoRows
+	}
+	link := m.byPost[postID]
+	cp := link
+	return &cp, nil
+}
+
+func (m *memoryLinks) GetRootByThreadID(_ context.Context, threadID string) (*store.DiscordLink, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	postID, ok := m.byThread[strings.TrimSpace(threadID)]
+	if !ok {
+		return nil, sql.ErrNoRows
+	}
+	link := m.byPost[postID]
+	cp := link
+	return &cp, nil
+}
+
+func (m *memoryLinks) Upsert(_ context.Context, link store.DiscordLink) error {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	link.PostID = strings.TrimSpace(link.PostID)
+	link.MessageID = strings.TrimSpace(link.MessageID)
+	link.ThreadID = strings.TrimSpace(link.ThreadID)
+	if link.CreatedAt == "" {
+		link.CreatedAt = time.Now().UTC().Format(time.RFC3339Nano)
+	}
+	if prev, ok := m.byPost[link.PostID]; ok {
+		delete(m.byMessage, prev.MessageID)
+		if prev.ThreadID != "" {
+			delete(m.byThread, prev.ThreadID)
+		}
+		if link.ThreadID == "" {
+			link.ThreadID = prev.ThreadID
+		}
+	}
+	m.byPost[link.PostID] = link
+	m.byMessage[link.MessageID] = link.PostID
+	if link.ThreadID != "" {
+		m.byThread[link.ThreadID] = link.PostID
+	}
+	return nil
+}