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import { Redis, ReplyError } from "ioredis";
import { webhook } from "@line/bot-sdk";
import { Logger } from "winston";
import { Env } from "@/Env";
export const MESSAGE_KEY = "message";
export type Id = string;
export type WebhookStreamObject = {
requestId: string;
signature: string;
destination: string;
events: webhook.Event[];
};
export type RedisRawMessage = {
messageId: string;
messageValue: string;
};
export function createRedisClientByEnv(
env: Env,
channelId: string
): RedisClient {
return new RedisClient(
env.redisHost,
env.redisPort,
env.redisStreamPrefixForLine,
channelId,
env.redisGroupNameForLine,
env.redisMaxRetriesPerRequest
);
}
export class RedisClient {
private streamPrefix: string;
private streamName: string;
private groupName: string;
private client: Redis;
constructor(
host: string,
port: number,
streamPrefix: string,
channelId: string,
groupName: string,
maxRetriesPerRequest: number
) {
this.client = new Redis({
host,
port,
maxRetriesPerRequest,
});
// エラー情報が標準出力されないようにする
this.client.on("error", (_err) => {});
this.streamPrefix = streamPrefix;
this.streamName = `${streamPrefix}:${channelId}`;
this.groupName = groupName;
}
async addWebhookStreamObject(object: WebhookStreamObject): Promise<Id> {
return await this.client.xadd(
this.streamName,
"*",
MESSAGE_KEY,
JSON.stringify(object)
);
}
async disconnect(): Promise<void> {
await this.client.quit();
}
async createConsumerGroupIfNotExists(): Promise<boolean> {
try {
await this.client.xgroup("CREATE", this.streamName, this.groupName, 0);
return true;
} catch (err) {
if (err instanceof Error && err.message.includes("BUSYGROUP")) {
return false;
}
throw err;
}
}
async readNewMessages(
logger: Logger,
consumerName: string,
maxCount: number
): Promise<WebhookMessageObject[]> {
const result = await this.client.xreadgroup(
"GROUP",
this.groupName,
consumerName,
"COUNT",
maxCount,
"STREAMS",
this.streamName,
">"
);
if (!result) {
logger.debug("result of readNewMessages is empty");
return [];
}
logger.debug("result of readNewMessages is not empty");
const [_stream, messages] = result[0] as [
string,
Array<[string, Array<string>]>
];
const messageObjects: WebhookMessageObject[] = [];
for (const [messageId, fields] of messages) {
const childLogger = logger.child({ messageId });
try {
const value = this.findValue(fields, MESSAGE_KEY);
const message = JSON.parse(value) as WebhookStreamObject;
messageObjects.push({
messageId: messageId,
requestId: message.requestId,
signature: message.signature,
destination: message.destination,
events: message.events,
});
} catch (err) {
childLogger.error(err);
}
}
return messageObjects;
}
async readLongPendingMessages(
logger: Logger,
consumerName: string,
maxIdleTimeMs: number,
maxCount: number,
maxDeliveryCount: number
): Promise<WebhookMessageObject[]> {
const messages: WebhookMessageObject[] = [];
let shouldContinue = true;
let begin = "-";
const end = "+";
while (shouldContinue) {
const pendingMessages = await this.xpending(
maxIdleTimeMs,
begin,
end,
10
);
logger.debug(`pendingMessages count: ${pendingMessages.length}`);
if (pendingMessages.length === 0) {
shouldContinue = false;
}
for (const pendingMessage of pendingMessages) {
begin = "(" + pendingMessage.messageId;
if (pendingMessage.consumer === consumerName) {
continue;
}
if (pendingMessage.deliveryCount >= maxDeliveryCount) {
continue;
}
try {
const message = await this.xclaim(
consumerName,
maxIdleTimeMs,
pendingMessage.messageId
);
messages.push(message);
} catch (err) {
logger.warn("skip xclaim for redis pending message", {
messageId: pendingMessage.messageId,
message: err,
});
}
if (maxCount && messages.length >= maxCount) {
shouldContinue = false;
break;
}
}
}
return messages;
}
async countStreamEntries(): Promise<number> {
return await this.client.xlen(this.streamName);
}
async deleteMessage(messageId: string): Promise<number> {
return await this.client.xdel(this.streamName, messageId);
}
async ackMessage(messageId: string): Promise<number> {
return await this.client.xack(this.streamName, this.groupName, messageId);
}
async eachStream(
callback: (streamName: string) => Promise<void>
): Promise<void> {
let cursor = "0";
while (true) {
const [nextCursor, keys] = await this.client.scan(
cursor,
"MATCH",
`${this.streamPrefix}:*`,
"COUNT",
"100",
"TYPE",
"stream"
);
for (const key of keys) {
await callback(key);
}
if (nextCursor === "0") {
break;
}
cursor = nextCursor;
}
}
async autoClaim(
streamName: string,
consumer: string,
minIdleTime: number,
count: number
): Promise<RedisRawMessage[]> {
try {
const result = await this.client.xautoclaim(
streamName,
this.groupName,
consumer,
minIdleTime,
"0-0",
"COUNT",
count
);
/*
取得結果は次の形式。２つ目の要素が再割り当てされたメッセージ。
1) "1728895288510-0"
2) 1) 1) "1728891713419-0"
2) 1) "message"
2) "value"
2) 1) "1728893217213-0"
2) 1) "message"
2) "value"
3) 1) "1728895085887-0"
2) 1) "message"
2) "value"
3) (empty array)
*/
const claimedMessages = result[1] as unknown[];
const messages: RedisRawMessage[] = [];
for (const claimedMessage of claimedMessages) {
const messageId = claimedMessage[0] as string;
const fields = claimedMessage[1] as string[];
const value = this.findValue(fields, MESSAGE_KEY);
messages.push({ messageId, messageValue: value });
}
return messages;
} catch (err) {
if (err instanceof ReplyError && err.message.includes("NOGROUP")) {
return [];
}
throw err;
}
}
private async xpending(
maxIdleTimeMs: number,
begin: string,
end: string,
count: number
): Promise<{ messageId: string; consumer: string; deliveryCount: number }[]> {
const result = (await this.client.xpending(
this.streamName,
this.groupName,
"IDLE",
maxIdleTimeMs,
begin,
end,
count
)) as Array<unknown[]>;
return result.map((msg) => ({
messageId: msg[0] as string,
consumer: msg[1] as string,
deliveryCount: msg[3] as number,
}));
}
private async xclaim(
consumerName: string,
maxIdleTimeMs: number,
messageId: string
): Promise<WebhookMessageObject> {
const result = await this.client.xclaim(
this.streamName,
this.groupName,
consumerName,
maxIdleTimeMs,
messageId
);
const fields = result[0][1] as string[];
const value = this.findValue(fields, "message");
return JSON.parse(value);
}
private findValue(fields: string[], key: string): string {
for (let index = 0; index < fields.length; index++) {
if (fields[index] === key) {
return fields[index + 1];
}
}
throw new Error(`key[${key}] is not found in redis message`);
}
}
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