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ld3zian 2025-03-28 20:27:17 -07:00
parent 7d4bf0eb2d
commit 0644b908d0
2 changed files with 201 additions and 231 deletions
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2
src/lib/api.ts
View file

@ -291,7 +291,7 @@ export async function getChaptersForSlugs(
lang: string = 'en'
): Promise<ChapterDetail[]> {
console.log(`Fetching chapters for ${slugs.length} comics`);
const redis = await getRedisClient();
const { client: redis } = await getRedisClient();
const uniqueSlugs = [...new Set(slugs)];
const pipeline = redis.pipeline();

430
src/lib/db.ts
View file

@ -322,232 +322,6 @@ async function getAvailableReplicas(activeClientUrl: string): Promise<Redis[]> {
return availableReplicas;
}
/**
* Ensures data is written to the primary instance (if available and not the source)
* and replicates to other available replicas.
*/
async function ensurePrimaryAndReplicate(
sourceUrl: string, // The URL of the instance that initially received the write
key: string,
value: string,
ttl?: number
): Promise<void> {
const replicationTasks: Promise<any>[] = [];
const targetUrls = new Set<string>(); // Keep track of where we tried to write/replicate
const operationDesc = ttl ? `set ${key} EX ${ttl}` : `set ${key}`;
// 1. Attempt to write to Primary (if it wasn't the source and exists)
if (PRIMARY_REDIS_URL && primaryClient && sourceUrl !== PRIMARY_REDIS_URL) {
targetUrls.add(PRIMARY_REDIS_URL);
const primaryName = getRedisName(PRIMARY_REDIS_URL);
console.log(`[Replication] Ensuring key ${key} on ${primaryName}`);
replicationTasks.push(
(async () => {
try {
// Check status, maybe ping if not ready but exists
if (primaryClient.status !== 'ready') {
await primaryClient.ping().catch(() => {}); // Try a ping, ignore error
}
if (primaryClient.status === 'ready') {
if (ttl) {
await primaryClient.set(key, value, 'EX', ttl);
} else {
await primaryClient.set(key, value);
}
console.log(`[Replication] Successfully synced key ${key} to ${primaryName}`);
return { url: PRIMARY_REDIS_URL, status: 'fulfilled' };
} else {
// Don't throw, just log that primary wasn't ready for sync
console.warn(`[Replication] Primary client not ready during sync attempt for key ${key}`);
return { url: PRIMARY_REDIS_URL, status: 'skipped', reason: 'not ready' };
}
} catch (error) {
console.error(`[Replication] Failed to sync key ${key} to ${primaryName}:`, error);
// Propagate the error status but don't throw to allow other replications
return { url: PRIMARY_REDIS_URL, status: 'rejected', error };
}
})()
);
} else if (sourceUrl === PRIMARY_REDIS_URL) {
// If the source *was* the primary, add it to targets so we don't try replicating back to it
targetUrls.add(PRIMARY_REDIS_URL);
console.log(`[Replication] Key ${key} was initially written to Primary.`);
}
// 2. Replicate to other available Replicas
// Ensure replica clients are potentially initialized
await initializeAllClients().catch(err => console.error("Error initializing clients during replication:", err));
for (const [url, replicaClient] of replicaClients.entries()) {
// Replicate if:
// - It's not the original source instance
// - It hasn't already been targeted (e.g., it's not the primary we just tried)
// - It's ready
if (url !== sourceUrl && !targetUrls.has(url) && replicaClient.status === 'ready') {
targetUrls.add(url); // Mark as targeted for replication
const replicaName = getRedisName(url);
console.log(`[Replication] Replicating key ${key} to ${replicaName}`);
replicationTasks.push(
(async () => {
try {
if (ttl) {
await replicaClient.set(key, value, 'EX', ttl);
} else {
await replicaClient.set(key, value);
}
console.log(`[Replication] Successfully replicated key ${key} to ${replicaName}`);
return { url: url, status: 'fulfilled' };
} catch (error) {
console.error(`[Replication] Replication failed for key ${key} to ${replicaName}:`, error);
return { url: url, status: 'rejected', error };
}
})()
);
} else if (url !== sourceUrl && !targetUrls.has(url)) {
// Log if a replica was skipped because it wasn't ready
console.warn(`[Replication] Skipping replication of key ${key} to ${getRedisName(url)} (not ready or already targeted). Status: ${replicaClient?.status}`);
}
}
// Wait for all replication tasks to settle
if (replicationTasks.length > 0) {
console.log(`[Replication] Waiting for ${replicationTasks.length} tasks for key ${key}...`);
const results = await Promise.allSettled(replicationTasks);
let successfulSync = 0;
let failedSync = 0;
let skippedSync = 0;
results.forEach(result => {
if (result.status === 'fulfilled') {
if (result.value.status === 'fulfilled') successfulSync++;
else if (result.value.status === 'rejected') failedSync++;
else if (result.value.status === 'skipped') skippedSync++;
} else {
// Promise itself rejected (unexpected)
failedSync++;
console.error("[Replication] Unexpected Promise rejection:", result.reason);
}
});
console.log(`[Replication] Tasks for key ${key} completed: ${successfulSync} succeeded, ${failedSync} failed, ${skippedSync} skipped.`);
} else {
console.log(`[Replication] No replication targets found or needed for key ${key} (Source: ${getRedisName(sourceUrl)})`);
}
}
/**
* Synchronize data from a replica to the primary
* Used when primary recovers after being down
*/
async function syncFromReplicaToPrimary(replicaUrl: string): Promise<void> {
if (!primaryClient || primaryClient.status !== "ready" || !replicaClients.has(replicaUrl)) {
console.log("Cannot sync: primary or replica not available");
return;
}
const replicaClient = replicaClients.get(replicaUrl)!;
console.log(`Starting sync from ${getRedisName(replicaUrl)} to Primary...`);
try {
// Get all feed keys using scan to prevent blocking
const feedKeys: string[] = [];
let cursor = '0';
do {
const [nextCursor, keys] = await replicaClient.scan(
cursor,
'MATCH',
'[0-9a-f]*', // Match feed IDs (hex format)
'COUNT',
'100'
);
cursor = nextCursor;
feedKeys.push(...keys);
} while (cursor !== '0');
// Also try scanning for any key pattern that might be a feed ID
cursor = '0';
const additionalKeys: string[] = [];
do {
const [nextCursor, keys] = await replicaClient.scan(
cursor,
'MATCH',
'feed:*', // Try another pattern
'COUNT',
'100'
);
cursor = nextCursor;
additionalKeys.push(...keys);
} while (cursor !== '0');
feedKeys.push(...additionalKeys);
// Get chapter cache keys
const chapterKeys: string[] = [];
cursor = '0';
do {
const [nextCursor, keys] = await replicaClient.scan(
cursor,
'MATCH',
'chapters:*',
'COUNT',
'100'
);
cursor = nextCursor;
chapterKeys.push(...keys);
} while (cursor !== '0');
console.log(`Found ${feedKeys.length} feed keys and ${chapterKeys.length} chapter keys to sync`);
// Sync feed mappings
if (feedKeys.length > 0) {
const feedPipeline = primaryClient.pipeline();
for (const key of feedKeys) {
const value = await replicaClient.get(key);
const ttl = await replicaClient.ttl(key);
if (value && ttl > 0) {
feedPipeline.set(key, value, 'EX', ttl);
}
}
await feedPipeline.exec();
console.log(`Synced ${feedKeys.length} feed mappings from replica to primary`);
}
// Sync chapter cache
if (chapterKeys.length > 0) {
const chapterPipeline = primaryClient.pipeline();
for (const key of chapterKeys) {
const value = await replicaClient.get(key);
const ttl = await replicaClient.ttl(key);
if (value && ttl > 0) {
chapterPipeline.set(key, value, 'EX', ttl);
}
}
await chapterPipeline.exec();
console.log(`Synced ${chapterKeys.length} chapter caches from replica to primary`);
}
lastUsedReplica = null; // Reset after successful sync
console.log("Replica to primary sync completed successfully");
} catch (error) {
console.error("Error during replica to primary sync:", error);
}
}
/**
* Store a feed mapping in Redis with immediate replication
*/
@ -582,23 +356,27 @@ export async function storeFeedMapping(
isCompressed = true;
// Store with compression flag on the active client
console.log(`[storeFeedMapping] Attempting initial SET (compressed) for key ${keyToStore} to ${getRedisName(activeUrl)}`);
await redis.set(keyToStore, valueToStore, "EX", DEFAULT_CACHE_TTL);
console.log(`Stored compressed mapping (${valueToStore.length} bytes) to ${getRedisName(activeUrl)}`);
console.log(`[storeFeedMapping] SUCCESS: Stored compressed mapping (${valueToStore.length} bytes) to ${getRedisName(activeUrl)}`);
} else {
// Use standard set operations without compression on the active client
console.log(`[storeFeedMapping] Attempting initial SET for key ${keyToStore} to ${getRedisName(activeUrl)}`);
await redis.set(keyToStore, valueToStore, "EX", DEFAULT_CACHE_TTL);
console.log(`Stored mapping for feed ${feedId} to ${getRedisName(activeUrl)}`);
console.log(`[storeFeedMapping] SUCCESS: Stored mapping for feed ${feedId} to ${getRedisName(activeUrl)}`);
}
// Ensure data is on primary and replicate to others
// Use the key/value that were actually stored (potentially compressed)
console.log(`[storeFeedMapping] Calling ensurePrimaryAndReplicate for key ${keyToStore} (source: ${getRedisName(activeUrl)})`);
await ensurePrimaryAndReplicate(activeUrl, keyToStore, valueToStore, DEFAULT_CACHE_TTL);
console.log(`Successfully processed storage and replication for feed ${feedId}`);
console.log(`[storeFeedMapping] Successfully processed storage and replication for feed ${feedId}`);
} catch (error) {
console.error(`Error storing feed mapping for ${feedId}:`, error);
// Log the specific error during the initial write attempt
console.error(`[storeFeedMapping] CRITICAL ERROR storing feed mapping for ${feedId} (key: ${keyToStore}):`, error);
// Consider if the error happened during initial write or replication
// If initial write failed, ensurePrimaryAndReplicate wouldn't have run
throw error; // Re-throw the error after logging
@ -923,6 +701,198 @@ export async function getBatchFeedMappings(
}
}
/**
* Ensures data is written to the primary (if not the source) and replicated.
* Logs sync attempts and outcomes without throwing errors for replication failures.
*/
async function ensurePrimaryAndReplicate(
sourceUrl: string,
key: string,
value: string,
ttl: number
): Promise<void> {
const replicationTasks: Promise<any>[] = [];
const sourceName = getRedisName(sourceUrl);
const primaryUrl = PRIMARY_REDIS_URL;
const primaryName = getRedisName(primaryUrl!);
console.log(`[ensurePrimaryAndReplicate] Starting sync for key ${key}. Source: ${sourceName}`);
// 1. Sync to Primary (if source wasn't primary and primary exists/is healthy)
if (primaryClient && sourceUrl !== primaryUrl) {
const primaryStatus = primaryClient.status;
console.log(`[ensurePrimaryAndReplicate] Checking primary (${primaryName}) status: ${primaryStatus}`);
let primaryIsReady = primaryStatus === 'ready';
if (!primaryIsReady) {
try {
await primaryClient.ping();
primaryIsReady = true;
console.log(`[ensurePrimaryAndReplicate] Primary (${primaryName}) ping successful after status check.`);
} catch (pingErr) {
console.warn(`[ensurePrimaryAndReplicate] Primary (${primaryName}) ping failed, skipping sync attempt. Status: ${primaryStatus}`, pingErr);
}
}
if (primaryIsReady) {
console.log(`[ensurePrimaryAndReplicate] Attempting sync to PRIMARY (${primaryName}) for key ${key}`);
replicationTasks.push(
primaryClient.set(key, value, "EX", ttl)
.then(() => console.log(`[ensurePrimaryAndReplicate] SUCCESS: Synced key ${key} to PRIMARY (${primaryName})`))
.catch(err => console.error(`[ensurePrimaryAndReplicate] FAILED: Sync key ${key} to PRIMARY (${primaryName})`, err))
);
} else {
console.log(`[ensurePrimaryAndReplicate] SKIPPED: Sync to PRIMARY (${primaryName}) because it's not ready (Status: ${primaryStatus}).`);
}
} else if (sourceUrl === primaryUrl) {
console.log(`[ensurePrimaryAndReplicate] Source was PRIMARY (${primaryName}), no primary sync needed for key ${key}.`);
} else {
console.log(`[ensurePrimaryAndReplicate] Primary client not available, cannot sync key ${key} to primary.`);
}
// 2. Replicate to other available replicas
console.log(`[ensurePrimaryAndReplicate] Checking ${replicaClients.size} replicas for key ${key}`);
for (const [replicaUrl, replicaClient] of replicaClients.entries()) {
const replicaName = getRedisName(replicaUrl);
// Don't replicate back to the source or to the primary (if primary sync was attempted above)
if (replicaUrl !== sourceUrl && replicaUrl !== primaryUrl) {
const replicaStatus = replicaClient.status;
console.log(`[ensurePrimaryAndReplicate] Checking replica ${replicaName} status: ${replicaStatus}`);
if (replicaStatus === 'ready') {
console.log(`[ensurePrimaryAndReplicate] Attempting replication to REPLICA (${replicaName}) for key ${key}`);
replicationTasks.push(
replicaClient.set(key, value, "EX", ttl)
.then(() => console.log(`[ensurePrimaryAndReplicate] SUCCESS: Replicated key ${key} to REPLICA (${replicaName})`))
.catch(err => console.error(`[ensurePrimaryAndReplicate] FAILED: Replicate key ${key} to REPLICA (${replicaName})`, err))
);
} else {
console.log(`[ensurePrimaryAndReplicate] SKIPPED: Replication to REPLICA (${replicaName}) because it's not ready (Status: ${replicaStatus}).`);
}
} else {
console.log(`[ensurePrimaryAndReplicate] SKIPPED: Replication to ${replicaName} (Source or Primary) for key ${key}.`);
}
}
// Wait for all sync/replication attempts to settle
if (replicationTasks.length > 0) {
console.log(`[ensurePrimaryAndReplicate] Waiting for ${replicationTasks.length} sync/replication tasks for key ${key}...`);
const results = await Promise.allSettled(replicationTasks);
console.log(`[ensurePrimaryAndReplicate] Sync/replication tasks settled for key ${key}. Results:`, results.map(r => r.status));
} else {
console.log(`[ensurePrimaryAndReplicate] No sync/replication tasks needed for key ${key}.`);
}
}
/**
* Synchronize data from a replica to the primary
* Used when primary recovers after being down
*/
async function syncFromReplicaToPrimary(replicaUrl: string): Promise<void> {
if (!primaryClient || primaryClient.status !== "ready" || !replicaClients.has(replicaUrl)) {
console.log("Cannot sync: primary or replica not available");
return;
}
const replicaClient = replicaClients.get(replicaUrl)!;
console.log(`Starting sync from ${getRedisName(replicaUrl)} to Primary...`);
try {
// Get all feed keys using scan to prevent blocking
const feedKeys: string[] = [];
let cursor = '0';
do {
const [nextCursor, keys] = await replicaClient.scan(
cursor,
'MATCH',
'[0-9a-f]*', // Match feed IDs (hex format)
'COUNT',
'100'
);
cursor = nextCursor;
feedKeys.push(...keys);
} while (cursor !== '0');
// Also try scanning for any key pattern that might be a feed ID
cursor = '0';
const additionalKeys: string[] = [];
do {
const [nextCursor, keys] = await replicaClient.scan(
cursor,
'MATCH',
'feed:*', // Try another pattern
'COUNT',
'100'
);
cursor = nextCursor;
additionalKeys.push(...keys);
} while (cursor !== '0');
feedKeys.push(...additionalKeys);
// Get chapter cache keys
const chapterKeys: string[] = [];
cursor = '0';
do {
const [nextCursor, keys] = await replicaClient.scan(
cursor,
'MATCH',
'chapters:*',
'COUNT',
'100'
);
cursor = nextCursor;
chapterKeys.push(...keys);
} while (cursor !== '0');
console.log(`Found ${feedKeys.length} feed keys and ${chapterKeys.length} chapter keys to sync`);
// Sync feed mappings
if (feedKeys.length > 0) {
const feedPipeline = primaryClient.pipeline();
for (const key of feedKeys) {
const value = await replicaClient.get(key);
const ttl = await replicaClient.ttl(key);
if (value && ttl > 0) {
feedPipeline.set(key, value, 'EX', ttl);
}
}
await feedPipeline.exec();
console.log(`Synced ${feedKeys.length} feed mappings from replica to primary`);
}
// Sync chapter cache
if (chapterKeys.length > 0) {
const chapterPipeline = primaryClient.pipeline();
for (const key of chapterKeys) {
const value = await replicaClient.get(key);
const ttl = await replicaClient.ttl(key);
if (value && ttl > 0) {
chapterPipeline.set(key, value, 'EX', ttl);
}
}
await chapterPipeline.exec();
console.log(`Synced ${chapterKeys.length} chapter caches from replica to primary`);
}
lastUsedReplica = null; // Reset after successful sync
console.log("Replica to primary sync completed successfully");
} catch (error) {
console.error("Error during replica to primary sync:", error);
}
}
// Initialize connections eagerly to establish connections as soon as possible
if (!import.meta.env.SSR) {
initializeAllClients()