Javascript questions which don't deserve their own thread.

The Something Awful Forums > Discussion > Serious Hardware/Software Crap > The Cavern of COBOL > Javascript questions which don't deserve their own thread.

VagueRant: May 24, 2012

On an AWS lambda with 10gb of memory, I'm hitting the NodeJS heap limit trying to stream a 7mb file and output a 3.5mb file.

Running some garbage collection logs on my unit tests, but can't see anything unusual to indicate a memory leak. Even removing the streams and just loading data (smaller local files) into memory seems to make little difference.

Any advice on how to find where this is going wrong?

# ¿ Aug 22, 2023 14:25

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# ¿ May 10, 2024 04:15

VagueRant: May 24, 2012

Losing my mind trying to understand a bit of syntax. My actual goal is turning it from an arrow function to a regular function declaration.

Technically using Typescript and the aws-embedded-metrics library if that gives any extra context.

code:

const publish = metricScope(metrics => async (input: ExampleObjType): Promise<MetricsLogger> => 
  metrics.someChainedFuncsThatPublishAMetric(input.exampleKey)
);

// Called as
publish({ exampleKey: 'example value' });

But to simplify, I'm clearly missing some key thing in my reading on how this is creating the 'metrics' value, and how I can turn it into a regular function:

code:

metricScope(metrics => async (input) => metrics.someChainedFuncs())

# ¿ Jan 23, 2024 12:16

VagueRant: May 24, 2012

Unless I'm misunderstanding even more :smith:

, we all seem to be forgetting the metricScope() func from the library, and the fact I'm not explicitly defining the 'metrics' value above any of the code?

To reference their docs:

TypeScript code:

const { metricScope, Unit, StorageResolution } = require("aws-embedded-metrics");

const myFunc = metricScope(metrics =>
  async (param1: string, param2: number) => {
    metrics.putDimensions({ Service: "Aggregator" });
    metrics.putMetric("ProcessingLatency", 100, Unit.Milliseconds, StorageResolution.Standard);
    metrics.putMetric("Memory.HeapUsed", 1600424.0, Unit.Bytes, StorageResolution.High);
    metrics.setProperty("RequestId", "422b1569-16f6-4a03-b8f0-fe3fd9b100f8");
    // ...
  });

await myFunc('myParam', 0);

# ¿ Jan 23, 2024 15:22

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