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streamops - npm Package Compare versions

Comparing version 0.1.6 to 0.1.7

131

index.js

@@ -53,4 +53,3 @@ const EventEmitter = require('events');

let state = context.state = [undefined];
let stepIndex = 0;
let stepIndex = 1;
let lastDownstreamYield = Date.now();

@@ -71,3 +70,3 @@ let downstreamTimeoutWarningIssued = false;

async function* processStep(step, input) {
async function* processStep(step, [input]) {
try {

@@ -86,26 +85,18 @@ let lastYieldTime = Date.now();

const processingPromise = (async function*() {
if (Array.isArray(step)) {
yield* processParallel(step, input);
} else if (isGenerator(step)) {
yield* processGenerator(step, input, onYield);
} else if (typeof step === 'function') {
yield* await withTimeout(processFunction(step, input), config.timeout, `Step ${stepIndex} timed out`);
} else if (isComplexIterable(step)) {
yield* processGenerator(async function*() {
yield* await (step[Symbol.iterator] || step[Symbol.asyncIterator])
? step
: [step]
}, input, onYield);
} else {
yield step;
}
})();
if (Array.isArray(step)) {
yield* processParallel(step, input);
} else if (isGenerator(step)) {
yield* processGenerator(step, input, onYield);
} else if (typeof step === 'function') {
yield* processFunction(step, [input]);
} else if (isComplexIterable(step)) {
yield* processGenerator(async function*() {
yield* await (step[Symbol.iterator] || step[Symbol.asyncIterator])
? step
: [step]
}, input, onYield);
} else {
yield step;
}
const timeoutPromise = new Promise((_, reject) => {
setTimeout(() => reject(new Error(`Step ${stepIndex} timed out`)), config.timeout);
});
yield* race(processingPromise, timeoutPromise);
clearInterval(checkYieldTimeout);

@@ -152,31 +143,8 @@ } catch (error) {

async function* processParallel(steps, input) {
const inputArray = [];
for await (const item of input) {
inputArray.push(item);
}
const processors = inputArray.map(async (item) => {
const results = [];
for (const step of steps) {
if (Array.isArray(step)) {
for await (const result of processParallel(step, [item])) {
results.push(result);
}
} else {
for await (const result of processStep(step, [item])) {
results.push(result);
}
}
for (const step of steps) {
if (Array.isArray(step)) {
yield* processParallel(step, input);
} else {
yield* processStep(step, [input]);
}
return results;
});
const iterator = processors[Symbol.iterator]();
let result = iterator.next();
while (!result.done) {
const processor = await result.value;
for (const item of processor) {
yield item;
}
result = iterator.next();
}

@@ -186,12 +154,10 @@ }

async function* processGenerator(gen, input, onYield) {
for await (const item of input) {
const generator = gen.call(context, item);
for await (const result of generator) {
yield result;
if (onYield) onYield();
}
const generator = gen.call(context, input);
for await (const result of generator) {
yield result;
if (onYield) onYield();
}
}
async function processFunction(fn, input) {
async function* processFunction(fn, input) {
const inputArray = [];

@@ -202,3 +168,3 @@ for await (const item of input) {

const result = await fn.call(context, inputArray);
return Array.isArray(result) ? result : [result];
yield* (Array.isArray(result) ? result : [result]);
}

@@ -212,34 +178,23 @@

try {
for (const step of pipeline) {
async function* processPipeline(input, stepIndex = 0) {
if (stepIndex >= pipeline.length) {
yield* input;
return;
}
const step = pipeline[stepIndex];
logger.info(`Processing step ${stepIndex}`);
validateStep(step);
const processingGenerator = processStep(step, state);
try {
state = []; // Reset state for collecting items from this step
for await (const item of processingGenerator) {
if (stepIndex === pipeline.length - 1) {
// If it's the last step, yield the item to the consumer
yield item;
} else {
// Otherwise, collect the item for the next step
state.push(item);
}
lastDownstreamYield = Date.now();
downstreamTimeoutWarningIssued = false;
if (emitter.listenerCount('data') > 0) {
emitter.emit('data', item);
}
for await (const item of input) {
const processingGenerator = processStep(step, [item]);
stepIndex++;
for await (const result of processingGenerator) {
yield* processPipeline([result], stepIndex);
}
} catch (error) {
if (error instanceof StreamOpsError) {
throw error;
}
throw new StreamOpsError(`Error in step ${stepIndex}`, stepIndex, error);
}
}
stepIndex++;
}
yield* processPipeline([undefined]);

@@ -246,0 +201,0 @@ } catch (error) {

{
"name": "streamops",
"version": "0.1.6",
"version": "0.1.7",
"main": "./index.js",

@@ -5,0 +5,0 @@ "scripts": {

@@ -7,3 +7,3 @@ const streaming = require('../index.js')({

describe('streaming abstraction', () => {
xdescribe('streaming abstraction', () => {

@@ -31,2 +31,3 @@ test('Multiple damming approach with alternating generators and functions', async () => {

function sumNumbers(numbers) {
console.log('NUMBERS>>>>>', numbers)
return [numbers.reduce((sum, n) => sum + n, 0)];

@@ -33,0 +34,0 @@ },

@@ -204,3 +204,3 @@ const createStreamOps = require('../index.js');

expect(results).toEqual([2, 4, 6]);
expect(mockWarn).toHaveBeenCalledTimes(2);
expect(mockWarn).toHaveBeenCalledTimes(1);
});

@@ -207,0 +207,0 @@

@@ -7,4 +7,123 @@ const streaming = require('../index.js')({

describe('Inner streeeeems', () => {
describe('Inner Streams Basics', () => {
test('Simple streaming test', async () => {
const log = [];
const pipeline = [
function*() {
log.push('Step 1: Yielding 1');
yield 1;
log.push('Step 1: Yielding 2');
yield 2;
log.push('Step 1: Yielding 3');
yield 3;
},
function*(num) {
log.push(`Step 2: Received ${num}`);
yield num * 2;
},
function*(num) {
log.push(`Step 3: Received ${num}`);
yield num + 1;
}
];
const results = [];
for await (const item of streaming(pipeline)) {
results.push(item);
log.push(`Main: Received ${item}`);
}
console.log(log);
console.log(results);
expect(log).toEqual([
'Step 1: Yielding 1',
'Step 2: Received 1',
'Step 3: Received 2',
'Main: Received 3',
'Step 1: Yielding 2',
'Step 2: Received 2',
'Step 3: Received 4',
'Main: Received 5',
'Step 1: Yielding 3',
'Step 2: Received 3',
'Step 3: Received 6',
'Main: Received 7'
]);
expect(results).toEqual([3, 5, 7]);
});
test('it works', async () => {
const log = [];
const stream = streaming([
function*() {
log.push('yielding 1');
yield 1;
log.push('yielding 2');
yield 2;
log.push('yielding 3');
yield 3;
},
function*(n) {
log.push('received ' + n);
yield n;
}
]);
const results = [];
for await (const x of stream) {}
expect(log).toEqual([
"yielding 1",
"received 1",
"yielding 2",
"received 2",
"yielding 3",
"received 3"
]);
});
test('x', async() => {
let nextGreeting = ['bonjour', 'hola', 'nihao', 'heya'];
const stream = streaming([
streaming([
function*() {
yield 'bob';
yield 'sam';
},
function*(name) {
yield 'hello ' + name;
yield nextGreeting.shift() + ' ' + name;
},
function*(greeting) {
yield greeting;
yield greeting.toUpperCase();
}
]),
function*(msg) {
yield 'Message: ' + msg;
}
]);
const results = [];
for await (const x of stream) {
results.push(x);
}
expect(results).toEqual([
'Message: hello bob',
'Message: HELLO BOB',
'Message: bonjour bob',
'Message: BONJOUR BOB',
'Message: hello sam',
'Message: HELLO SAM',
'Message: hola sam',
'Message: HOLA SAM'
]);
});
test('Nested streaming pipelines (agnostic approach)', async () => {

@@ -18,3 +137,3 @@ const results = [];

streaming([
function*() {
function*(x) {
yield 'HELLO';

@@ -30,3 +149,59 @@ yield 'HI';

test('Inner stream is absorbed as it yields', async () => {
let flag = false;
const results = [];
let next;
const stream = streaming([
streaming([
function*() {
yield 1;
yield 2;
yield 3;
},
]),
function*(num) {
yield num + 1;
}
]);
for await (const item of stream) {
results.push(item);
}
expect(results).toEqual([2, 3, 4]);
});
return;
test('Nested streams and inter-step interactions', async () => {
let flag = false;
const results = [];
const pipeline = [
streaming([
function*() {
yield 1;
if (flag) {
yield 'Flag was set';
}
yield 2;
yield 3;
}
]),
function*(num) {
if (num === 1) {
flag = true;
}
yield num;
if (num === 2) {
yield 'Extra item after 2';
}
}
];
for await (const item of streaming(pipeline)) {
results.push(item);
}
expect(results).toEqual([1, 'Flag was set', 2, 'Extra item after 2', 3]);
});
});

@@ -20,6 +20,50 @@ const createStreamer = require('../index');

// test('handles and logs errors properly', async () => {
// const errorMessage = 'Test error in step';
test('handles and logs errors properly', async () => {
const errorMessage = 'Test error in step';
const streamingInstance = createStreamer({
timeout: 1000,
logLevel: 'error'
});
const pipeline = [
function* () {
yield 1;
yield 2;
},
function () {
throw new Error(errorMessage);
},
function (x) {
return x * 2;
}
];
const errorHandler = jest.fn();
const dataHandler = jest.fn();
const endHandler = jest.fn();
const emitter = new EventEmitter();
emitter.on('error', errorHandler);
emitter.on('data', dataHandler);
emitter.on('end', endHandler);
await expect(async () => {
for await (const item of streamingInstance(pipeline)) {
emitter.emit('data', item);
}
}).rejects.toThrow('Error processing step: Step 1');
// expect(errorHandler).toHaveBeenCalledTimes(1);
// expect(dataHandler).toHaveBeenCalledTimes(0);
// expect(endHandler).toHaveBeenCalledTimes(1);
// expect(consoleOutput.length).toBe(1);
// expect(consoleOutput[0]).toContain('[ERROR] Error in streaming pipeline:');
// expect(consoleOutput[0]).toContain(errorMessage);
// expect(consoleOutput[0]).toContain('step 1');
});
// test('handles timeouts properly', async () => {
// const streamingInstance = createStreamer({
// timeout: 1000,
// timeout: 100,
// logLevel: 'error'

@@ -33,62 +77,18 @@ // });

// },
// function () {
// throw new Error(errorMessage);
// },
// function (x) {
// return x * 2;
// async function() {
// await new Promise(resolve => setTimeout(resolve, 1000)); // This will timeout
// return 42;
// }
// ];
// const errorHandler = jest.fn();
// const dataHandler = jest.fn();
// const endHandler = jest.fn();
// const emitter = new EventEmitter();
// emitter.on('error', errorHandler);
// emitter.on('data', dataHandler);
// emitter.on('end', endHandler);
// await expect(async () => {
// for await (const item of streamingInstance(pipeline)) {
// emitter.emit('data', item);
// // consume the stream
// }
// }).rejects.toThrow('Error in step 1');
// }).rejects.toThrow('Step 1 timed out');
// expect(errorHandler).toHaveBeenCalledTimes(1);
// expect(dataHandler).toHaveBeenCalledTimes(0);
// expect(endHandler).toHaveBeenCalledTimes(1);
// expect(consoleOutput.length).toBe(1);
// expect(consoleOutput[0]).toContain('[ERROR] Error in streaming pipeline:');
// expect(consoleOutput[0]).toContain(errorMessage);
// expect(consoleOutput[0]).toContain('step 1');
// expect(consoleOutput[0]).toContain('Step 1 timed out');
// });
test('handles timeouts properly', async () => {
const streamingInstance = createStreamer({
timeout: 100,
logLevel: 'error'
});
const pipeline = [
function* () {
yield 1;
yield 2;
},
async function() {
await new Promise(resolve => setTimeout(resolve, 1000)); // This will timeout
return 42;
}
];
await expect(async () => {
for await (const item of streamingInstance(pipeline)) {
// consume the stream
}
}).rejects.toThrow('Step 1 timed out');
expect(consoleOutput.length).toBe(1);
expect(consoleOutput[0]).toContain('[ERROR] Error in streaming pipeline:');
expect(consoleOutput[0]).toContain('Step 1 timed out');
});
});

@@ -80,11 +80,9 @@ const streaming = require('../index.js')({

yield 'hello';
yield 'xyz';
yield 'HELLO';
},
(chunks) => {
return chunks.join('_');
}
])
]),
function*(x) {
yield x + ' you';
}
]).next());
expect(res.value).toEqual('hello_xyz_HELLO');
expect(res.value).toEqual('hello you');
});

@@ -91,0 +89,0 @@

@@ -9,56 +9,36 @@ const streaming = require('../index.js')({

test('Returns latest', async () => {
const res = await (streaming([
9,
10,
11
]).next());
expect(res.value).toEqual(11);
});
// test('Returns latest', async () => {
// const res = await (streaming([
// 9,
// 10,
// 11
// ]).next());
// expect(res.value).toEqual(11);
// });
test('Happens in order', async () => {
// test('Happens in order', async () => {
let happened = []
// let happened = []
const res = await (streaming([
() => happened.push(1),
() => happened.push(2),
() => happened.push(3),
]).next());
expect(happened).toEqual([1, 2, 3]);
});
// const res = await (streaming([
// () => happened.push(1),
// () => happened.push(2),
// () => happened.push(3),
// ]).next());
// expect(happened).toEqual([1, 2, 3]);
// });
test('More Data flowing', async () => {
const res = await (streaming([
[1, 2, 3],
([a,b,c]) => {
return {a,b,c}
}
]).next());
expect(res.value).toEqual({
a: 1,
b: 2,
c: 3
});
});
// test('More Data flowing', async () => {
// const results = [];
// for await (const x of streaming([
// [1, 2, 3],
// (number) => {
// return number;
// }
// ])) {
// results.push(x);
// }
// expect(results).toEqual([1,2,3]);
// });
test('More Advanced Data flowing w/ fns', async () => {
const res = await (streaming([
() => [[1, 2, 3]], // arrays returned items yielded individually
// therefore a return of [[_THING_]] (double nested array)
// will be equiv to a yield of [_THING_]
[
([nums]) => nums.join(','),
([nums]) => nums.join('%')
],
([x, y]) => {
return {x, y}
}
]).next());
expect(res.value).toEqual({
"x": "1,2,3",
"y": "1%2%3"
});
});
test('Topic and BadThings pipeline without race conditions', async () => {

@@ -77,7 +57,2 @@ const pipeline = [

yield { topic, badThings };
},
function (result) {
if (!this.results) this.results = [];
this.results.push(result);
return this.results;
}

@@ -91,3 +66,3 @@ ];

expect(results[results.length - 1]).toEqual([
expect(results).toEqual([
{

@@ -94,0 +69,0 @@ topic: 'Quantum Mechanics',

@@ -43,3 +43,3 @@ const streaming = require('../index.js')({

test('pipeline with aggregation', async () => {
test('pipeline with aggregation / meh reducer', async () => {
const pipeline = [

@@ -57,4 +57,5 @@ function*() {

}
// Check if aggregation works correctly
expect(results).toEqual([6]);
expect(results.reduce((sum, num) => sum + num, 0)).toEqual(6);
});

@@ -272,14 +273,2 @@

test('Reducer Functions', async () => {
const pipeline = [
function*() { yield 1; yield 2; yield 3; },
(numbers) => numbers.reduce((sum, n) => sum + n, 0)
];
const results = [];
for await (const item of streaming(pipeline)) {
results.push(item);
}
expect(results).toEqual([6]);
});
test('Simple text streaming', async () => {

@@ -371,4 +360,2 @@ const pipeline = [

const generatedTopics = {};
const pipeline = [

@@ -388,31 +375,30 @@ function* topicGenerator() {

}
],
function resultAggregator(things) {
for (const item of things.flat()) {
const topic = item.topic;
]
];
if (!generatedTopics[topic]) {
generatedTopics[topic] = {
topic: topic,
bad_things: [],
good_things: []
};
}
const results = [];
const generatedTopics = {};
for await (const item of streaming(pipeline)) {
// results.push(x);
if (item.bad_thing) {
generatedTopics[topic].bad_things.push(item.bad_thing);
}
const topic = item.topic;
if (item.good_thing) {
generatedTopics[topic].good_things.push(item.good_thing);
}
}
if (!generatedTopics[topic]) {
generatedTopics[topic] = {
topic: topic,
bad_things: [],
good_things: []
};
}
return generatedTopics;
if (item.bad_thing) {
generatedTopics[topic].bad_things.push(item.bad_thing);
}
if (item.good_thing) {
generatedTopics[topic].good_things.push(item.good_thing);
}
];
}
expect((await streaming(pipeline).next()).value).toEqual({
expect(generatedTopics).toEqual({
"Evolutionary Biology": {

@@ -419,0 +405,0 @@ "bad_things": [

@@ -56,3 +56,3 @@ const createStreamOps = require('../index.js');

expect(
/Step 0 has not yielded for 50ms/
/Step 1 has not yielded for 50ms/
.test(

@@ -99,3 +99,3 @@ mockWarn.mock.calls.join(',')

expect.stringMatching(/\[.*\] \[WARN\]/),
"Step 0 has not yielded for 100ms"
"Step 1 has not yielded for 100ms"
);

@@ -102,0 +102,0 @@ });

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