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sequentialize
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Refactor to use push-buffer; fixes error handling

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master
Sven Slootweg 5 months ago
parent 4203bb1d5a
commit 0074a3c32e
4 changed files with 486 additions and 61 deletions
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29
index.js
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@ -1,11 +1,24 @@
"use strict";
const propagateAbort = require("@promistream/propagate-abort");
const createSequentialQueue = require("./sequential-queue");
const pushBuffer = require("push-buffer");
module.exports = function sequentialize() {
let withQueue = createSequentialQueue();
let lastKnownSource;
let readBuffer = pushBuffer({
sequential: true,
pull: async () => {
return lastKnownSource.read();
}
});
let peekBuffer = pushBuffer({
sequential: true,
pull: async () => {
return lastKnownSource.peek();
}
});
return {
_promistreamVersion: 0,
@ -13,14 +26,12 @@ module.exports = function sequentialize() {
// FIXME: We don't queue up aborts because once a downstream has encountered an error, it may have stopped trying to read, and we would deadlock. While the Aborted marker reads *do* get queued, the abort itself should probably be immediate. Need to make sure that this doesn't clash with any other part of the spec.
abort: propagateAbort,
peek: function peek(source) {
return withQueue(() => {
return source.peek();
});
lastKnownSource = source;
return peekBuffer.request();
},
read: function read(source) {
return withQueue(() => {
return source.read();
});
lastKnownSource = source;
return readBuffer.request();
}
};
};

3
package.json
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@ -9,6 +9,7 @@
"@joepie91/unreachable": "^1.0.0",
"@promistream/propagate-abort": "^0.1.2",
"bluebird": "^3.5.4",
"p-defer": "^3.0.0"
"p-defer": "^3.0.0",
"push-buffer": "^1.1.1"
}
}

464
pnpm-lock.yaml
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@ -0,0 +1,464 @@
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dependencies:
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transitivePeerDependencies:
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dependencies:
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51
sequential-queue.js
Unescape Escape View File

@ -1,51 +0,0 @@
"use strict";
// FIXME: Make this a stand-alone package; it should be useful as a general-purpose mechanism for sequentializing multiple asynchronous operations that may originate from multiple different callsites (like with read/peek/abort)
const Promise = require("bluebird");
const pDefer = require("p-defer");
const unreachable = require("@joepie91/unreachable")("@promistream/sequentialize"); // FIXME: Change name when moved out into a stand-alone package
module.exports = function createSequentialQueue() {
/* TODO: Does this need a more efficient FIFO queue implementation? */
let queue = [];
let processing = false;
function nextItem() {
if (queue.length > 0) {
let item = queue.shift();
item();
} else {
unreachable("Tried to process an item from an empty queue");
}
}
function tryStart() {
if (processing === false) {
processing = true;
nextItem();
}
}
function markCompleted() {
if (queue.length > 0) {
nextItem();
} else {
processing = false;
}
}
return function withQueue(callback) {
let { resolve, promise } = pDefer();
queue.push(resolve);
tryStart();
return Promise.try(() => {
return promise;
}).then(() => {
return callback();
}).tap(() => {
markCompleted();
});
};
}
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