@riddance/aws-host
Version:
This is `@riddance/aws-host`, a TypeScript AWS Lambda host adapter for the Riddance serverless framework. It provides AWS-specific implementations for HTTP, event, timer, and context handling in Lambda functions by providing Lambda entry points that trans
89 lines • 15.4 kB
JavaScript
import { missing } from '@riddance/fetch';
import { handle } from '@riddance/host/event';
import { measure } from '@riddance/host/lib/event';
import { getHandlers } from '@riddance/host/registry';
import { brotliDecompress } from 'node:zlib';
import { createAwsContext } from './context.js';
export { setMeta } from '@riddance/host/registry';
export * from '@riddance/service/event';
async function asyncIndex(event, awsContext, callback) {
const [handler] = getHandlers('event');
if (!handler) {
throw new Error('No event handler registered.');
}
const { log, context, success, flush } = createAwsContext(awsContext, { default: 150 }, {}, clientFromAttributes(event.Records[0]?.Sns.MessageAttributes), handler.config, handler.meta, awsContext.invokedFunctionArn.split(':')[4]);
const events = await Promise.allSettled(event.Records.map(async (r) => ({
subject: r.Sns.Subject ?? missing('subject'),
timestamp: new Date(r.Sns.Timestamp),
messageId: r.Sns.MessageId,
event: await eventFromMessage(r.Sns.Message, r.Sns.MessageAttributes),
})));
const malformedEvents = events.filter(e => e.status === 'rejected');
for (const failed of malformedEvents) {
log.fatal('Error parsing event.', failed.reason);
}
const sent = await Promise.allSettled(events
.filter(e => e.status === 'fulfilled')
.map(e => handle(log, context, handler, e.value, success)));
const notSent = sent.filter(e => e.status === 'rejected');
for (const failed of notSent) {
log.fatal('Error sending event.', failed.reason);
}
if (malformedEvents.length !== 0 ||
notSent.length !== 0 ||
sent.some(e => e.status === 'fulfilled' && !e.value)) {
callback(new AggregateError([...malformedEvents, ...notSent], 'Error handling event.'));
await measure(log, 'flush', flush);
return;
}
try {
callback(undefined);
}
catch (e) {
log.fatal('Error sending result to Lambda.', e);
}
await measure(log.enrichReserved({ meta: handler.meta }), 'flush', flush);
}
function clientFromAttributes(attributes) {
if (!attributes) {
return {};
}
return {
clientId: attributes.clientId?.Value,
clientIp: attributes.clientIp?.Value,
clientPort: Number(attributes.clientPort?.Value) || undefined,
operationId: attributes.operationId?.Value,
userAgent: attributes.userAgent?.Value,
};
}
async function eventFromMessage(message, attributes) {
if (!message) {
return undefined;
}
const messageToParse = await getMessageToParse(message, attributes);
return JSON.parse(messageToParse);
}
async function getMessageToParse(message, attributes) {
const isCompressed = attributes?.['content-encoding']?.Value === 'br';
if (!isCompressed) {
return message;
}
const decompressed = await decompress(Buffer.from(message, 'base64'));
return decompressed.toString('utf8');
}
function decompress(data) {
return new Promise((resolve, reject) => {
brotliDecompress(data, (err, result) => {
if (err) {
reject(err);
return;
}
resolve(result);
});
});
}
export function awsHandler(event, context, callback) {
context.callbackWaitsForEmptyEventLoop = false;
asyncIndex(event, context, callback).catch((e) => setImmediate(callback, e));
}
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{ missing } from '@riddance/fetch'\nimport type { ClientInfo } from '@riddance/host/context'\nimport { handle } from '@riddance/host/event'\nimport { measure, type Json } from '@riddance/host/lib/event'\nimport { getHandlers } from '@riddance/host/registry'\nimport { brotliDecompress } from 'node:zlib'\nimport { AwsContext, createAwsContext } from './context.js'\n\nexport { setMeta } from '@riddance/host/registry'\nexport * from '@riddance/service/event'\n\n// https://github.com/DefinitelyTyped/DefinitelyTyped/blob/b969f890000ff95740fd7b879cdf3b73e1ea0fe8/types/aws-lambda/trigger/sns.d.ts\n\ntype SNSMessageAttribute = {\n    Type: string\n    Value: string\n}\n\ntype SNSMessageAttributes = {\n    [name: string]: SNSMessageAttribute\n}\n\ntype SNSMessage = {\n    SignatureVersion: string\n    Timestamp: string\n    Signature: string\n    SigningCertUrl: string\n    MessageId: string\n    Message: string\n    MessageAttributes: SNSMessageAttributes\n    Type: string\n    UnsubscribeUrl: string\n    TopicArn: string\n    Subject?: string\n    Token?: string\n}\n\ntype SNSEventRecord = {\n    EventVersion: string\n    EventSubscriptionArn: string\n    EventSource: string\n    Sns: SNSMessage\n}\n\ntype SNSEvent = {\n    Records: SNSEventRecord[]\n}\n\nasync function asyncIndex(\n    event: SNSEvent,\n    awsContext: AwsContext,\n    callback: (error: unknown) => void,\n) {\n    const [handler] = getHandlers('event')\n    if (!handler) {\n        throw new Error('No event handler registered.')\n    }\n    const { log, context, success, flush } = createAwsContext(\n        awsContext,\n        { default: 150 },\n        {},\n        clientFromAttributes(event.Records[0]?.Sns.MessageAttributes),\n        handler.config,\n        handler.meta,\n        awsContext.invokedFunctionArn.split(':')[4],\n    )\n\n    const events = await Promise.allSettled(\n        event.Records.map(async r => ({\n            subject: r.Sns.Subject ?? missing('subject'),\n            timestamp: new Date(r.Sns.Timestamp),\n            messageId: r.Sns.MessageId,\n            event: await eventFromMessage(r.Sns.Message, r.Sns.MessageAttributes),\n        })),\n    )\n    const malformedEvents = events.filter(e => e.status === 'rejected')\n    for (const failed of malformedEvents) {\n        log.fatal('Error parsing event.', failed.reason)\n    }\n\n    const sent = await Promise.allSettled(\n        events\n            .filter(e => e.status === 'fulfilled')\n            .map(e => handle(log, context, handler, e.value, success)),\n    )\n    const notSent = sent.filter(e => e.status === 'rejected')\n    for (const failed of notSent) {\n        log.fatal('Error sending event.', failed.reason)\n    }\n    if (\n        malformedEvents.length !== 0 ||\n        notSent.length !== 0 ||\n        sent.some(e => e.status === 'fulfilled' && !e.value)\n    ) {\n        callback(new AggregateError([...malformedEvents, ...notSent], 'Error handling event.'))\n        await measure(log, 'flush', flush)\n        return\n    }\n\n    try {\n        callback(undefined)\n    } catch (e) {\n        log.fatal('Error sending result to Lambda.', e)\n    }\n\n    await measure(log.enrichReserved({ meta: handler.meta }), 'flush', flush)\n}\n\nfunction clientFromAttributes(attributes: SNSMessageAttributes | undefined): ClientInfo {\n    if (!attributes) {\n        return {}\n    }\n    return {\n        clientId: attributes.clientId?.Value,\n        clientIp: attributes.clientIp?.Value,\n        clientPort: Number(attributes.clientPort?.Value) || undefined,\n        operationId: attributes.operationId?.Value,\n        userAgent: attributes.userAgent?.Value,\n    }\n}\n\nasync function eventFromMessage(message: string, attributes?: SNSMessageAttributes) {\n    if (!message) {\n        return undefined\n    }\n\n    const messageToParse = await getMessageToParse(message, attributes)\n    return JSON.parse(messageToParse) as {\n        readonly [key: string]: Json\n    }\n}\n\nasync function getMessageToParse(message: string, attributes?: SNSMessageAttributes) {\n    const isCompressed = attributes?.['content-encoding']?.Value === 'br'\n    if (!isCompressed) {\n        return message\n    }\n    const decompressed = await decompress(Buffer.from(message, 'base64'))\n    return decompressed.toString('utf8')\n}\n\nfunction decompress(data: Buffer) {\n    return new Promise<Buffer>((resolve, reject) => {\n        brotliDecompress(data, (err, result) => {\n            if (err) {\n                reject(err)\n                return\n            }\n            resolve(result)\n        })\n    })\n}\n\nexport function awsHandler(\n    event: SNSEvent,\n    context: AwsContext,\n    callback: (error: unknown) => void,\n) {\n    context.callbackWaitsForEmptyEventLoop = false\n    asyncIndex(event, context, callback).catch((e: unknown) => setImmediate(callback, e))\n}\n"]}