@ydbjs/topic/dist/writer/_write.js

YDB Topics client for publish-subscribe messaging. Provides at-least-once delivery, exactly-once publishing, FIFO guarantees, and scalable message processing for unstructured data.

import { create } from "@bufbuild/protobuf";
import { timestampFromDate } from "@bufbuild/protobuf/wkt";
import { StreamWriteMessage_WriteRequest_MessageDataSchema } from "@ydbjs/api/topic";
import { _flush } from "./_flush.js";
import { MAX_PAYLOAD_SIZE } from "./constants.js";
export function _write(ctx, msg) {
    let data = ctx.codec ? ctx.codec.compress(msg.data) : msg.data;
    // Validate the payload size, it should not exceed MAX_PAYLOAD_SIZE
    // This is a YDB limitation for single message size.
    if (data.length > MAX_PAYLOAD_SIZE) {
        throw new Error(`Payload size exceeds ${Number(MAX_PAYLOAD_SIZE / (1024n * 1024n))}MiB limit.`);
    }
    let seqNo = msg.seqNo ?? ((ctx.lastSeqNo ?? 0n) + 1n);
    let createdAt = timestampFromDate(msg.createdAt ?? new Date());
    let metadataItems = Object.entries(msg.metadataItems || {}).map(([key, value]) => ({ key, value }));
    let uncompressedSize = BigInt(data.length);
    let message = create(StreamWriteMessage_WriteRequest_MessageDataSchema, {
        data,
        seqNo,
        createdAt,
        metadataItems,
        uncompressedSize,
    });
    ctx.buffer.push(message); // Store the message in the buffer
    ctx.updateBufferSize(BigInt(data.length)); // Update the buffer size
    ctx.updateLastSeqNo(seqNo); // Update the last sequence number
    return seqNo;
}
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