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import { v4 as uuidv4 } from "uuid";
import type { WebhookMessageObject } from "@/types/api";
import { RequestDataParser } from "@/Request";
import { createRedisClientByEnv } from "@/Redis";
import { paths } from "@/types/api.gen";
import { Request, Response } from "express";
import { Logger } from "@/Logger";
type GetResponse =
paths["/api/line/webhook/{channelId}/messages/new"]["get"]["responses"]["200"]["content"]["application/json"];
export async function GET(
env: Env,
parentLogger: Logger,
req: Request,
res: Response
) {
const requestId = uuidv4();
const logger = parentLogger.child({ requestId });
const params = new RequestDataParser(req);
const channelId = params.getPathParamAsString("channelId");
const consumer = params.getQueryParamAsString("consumer");
const maxCount = params.getQueryParamAsNumberWithDefault("max_count", 0);
const maxIdleTimeMs = params.getQueryParamAsNumberWithDefault(
"max_idle_time_ms",
60000
);
const maxDeliveryCount = params.getQueryParamAsNumberWithDefault(
"max_delivery_count",
3
);
logger.info("received request", {
channelId,
consumer,
maxCount,
maxIdleTimeMs,
maxDeliveryCount,
});
const messages = await readMessages(
env,
logger,
channelId,
consumer,
maxCount,
maxIdleTimeMs,
maxDeliveryCount
);
const resObj: GetResponse = { messages };
res.status(200).json(resObj);
}
async function readMessages(
env: Env,
logger: Logger,
channelId: string,
consumer: string,
maxCount: number,
maxIdleTimeMs: number,
maxDeliveryCount: number
): Promise<WebhookMessageObject[]> {
const client = createRedisClientByEnv(env, channelId);
logger.debug("make redis client", {
redisHost: env.redisHost,
redisPort: env.redisPort,
redisStreamName: env.redisStreamPrefixForLine,
channelId,
redisGroupName: env.redisGroupNameForLine,
});
try {
const entriesCount = await client.countStreamEntries();
if (entriesCount === 0) {
return [];
}
const created = await client.createConsumerGroupIfNotExists();
if (created) {
logger.debug(`created consumer group ${env.redisGroupNameForLine}`);
} else {
logger.debug(
`skiped created consumer group ${env.redisGroupNameForLine}, group is exists`
);
}
const longPendingMessages = await client.readLongPendingMessages(
logger,
consumer,
maxIdleTimeMs,
maxCount,
maxDeliveryCount
);
logger.debug("read long pending messages", { longPendingMessages });
if (maxCount && longPendingMessages.length >= maxCount) {
return longPendingMessages;
}
const readNewMessagesMaxCount = Math.max(
maxCount - longPendingMessages.length,
0
);
const newMessages = await client.readNewMessages(
logger,
consumer,
readNewMessagesMaxCount
);
logger.debug("read new messages", { newMessages });
return longPendingMessages.concat(newMessages);
} finally {
await client.disconnect();
}
}
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