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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,17 @@ | ||
| bring cloud; | ||
| bring util; | ||
|
|
||
| let c = new cloud.Counter(); | ||
| let t = new cloud.Topic(); | ||
| t.onMessage(inflight (msg: str) => { | ||
| c.inc(); | ||
| }); | ||
|
|
||
| test "publish message array to topic" { | ||
| t.publish("msg1", "msg2", "msg3", | ||
| "msg4", "msg5", "msg6", "msg7", | ||
| "msg8", "msg9", "msg10", "msg11", | ||
| "msg12", "msg13", "msg14", "msg15"); | ||
|
|
||
| assert(util.waitUntil(inflight () => { return c.peek() == 15; })); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,17 +1,68 @@ | ||
| import { SNSClient, PublishCommand } from "@aws-sdk/client-sns"; | ||
| import { | ||
| SNSClient, | ||
| PublishBatchCommand, | ||
| PublishBatchRequestEntry, | ||
| InvalidBatchEntryIdException, | ||
| } from "@aws-sdk/client-sns"; | ||
| import { ITopicClient } from "../cloud"; | ||
| import { Util } from "../util/util"; | ||
|
|
||
| /** | ||
| * Topics in AWS can receive up to 10 messages at a time | ||
| * using the PublishBatchCommand, this constant is used | ||
| * to generate batches respecting the limits. | ||
| */ | ||
| const CHUNK_SIZE = 10; | ||
|
|
||
| export class TopicClient implements ITopicClient { | ||
| constructor( | ||
| private readonly topicArn: string, | ||
| private readonly client: SNSClient = new SNSClient({}) | ||
| ) {} | ||
|
|
||
| public async publish(message: string): Promise<void> { | ||
| const command = new PublishCommand({ | ||
| Message: message, | ||
| TopicArn: this.topicArn, | ||
| }); | ||
| await this.client.send(command); | ||
| public async publish(...messages: string[]): Promise<void> { | ||
| if (messages.includes("")) { | ||
| throw new Error("Empty messages are not allowed"); | ||
| } | ||
|
|
||
| let batchMessages: Array<PublishBatchRequestEntry[]> = []; | ||
| for (let i = 0; i < messages.length; i += CHUNK_SIZE) { | ||
| const chunk = messages.slice(i, i + CHUNK_SIZE); | ||
| batchMessages.push(this.processBatchMessages(chunk, i)); | ||
| } | ||
|
|
||
| for (const batch of batchMessages) { | ||
| try { | ||
| const command = new PublishBatchCommand({ | ||
| TopicArn: this.topicArn, | ||
| PublishBatchRequestEntries: batch, | ||
| }); | ||
| await this.client.send(command); | ||
| } catch (e) { | ||
| if (e instanceof InvalidBatchEntryIdException) { | ||
| throw new Error( | ||
| `The Id of a batch entry in a batch request doesn't abide by the specification. (message=${messages}): ${ | ||
| (e as Error).stack | ||
| })}` | ||
| ); | ||
| } | ||
| throw new Error((e as Error).stack); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| private processBatchMessages( | ||
| messages: string[], | ||
| idx: number | ||
| ): PublishBatchRequestEntry[] { | ||
| let batchMessages: Array<PublishBatchRequestEntry> = []; | ||
| let index = idx; | ||
| for (const message of messages) { | ||
| batchMessages.push({ | ||
| Id: Util.sha256(`${message}-${++index}`), | ||
| Message: message, | ||
| }); | ||
| } | ||
| return batchMessages; | ||
| } | ||
| } |
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