fix: multi-repo local dev (file:../ deps, package exports, missing deps)
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+201
@@ -0,0 +1,201 @@
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+88
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# adaptive-timeout
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Adaptive timeout calculation with EWMA-based tracking and fallback strategies.
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## Install
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```
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npm install adaptive-timeout
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```
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## Usage
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```js
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const AdaptiveTimeout = require('adaptive-timeout')
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const timeouts = new AdaptiveTimeout()
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// Record a sample when you get a response
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timeouts.put('10.0.0.1:8080', 150)
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// Get timeout for next request (attempt 1, 2, 3...)
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timeouts.get('10.0.0.1:8080', 1) // adaptive based on recorded samples
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timeouts.get('unknown-peer', 1) // uses fallback strategy
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```
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## API
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#### `const timeouts = new AdaptiveTimeout([options])`
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Create a new instance.
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Options:
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- `maxSize` - max cache entries (default: `65536`)
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- `maxAge` - entry TTL in ms (default: `600000` / 10 minutes)
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- `fallback` - timeout sequence for unknown keys (default: `[500, 750, 1000, 1500, 2000]`)
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- `min` - minimum timeout for known keys (default: `300`)
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- `max` - maximum timeout for known keys (default: `5000`)
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- `jitter` - random jitter range in ms (default: `256`)
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#### `timeouts.put(key, value)`
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Record a sample. Updates the exponentially weighted moving average.
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Returns `{ avg, variance }`.
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#### `timeouts.get(key, [attempt])`
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Get a timeout value.
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For known keys: calculates adaptive timeout with linear backoff based on attempt number.
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For unknown keys: returns value from fallback sequence based on attempt number.
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#### `timeouts.getValue(key)`
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Get raw stats for a key. Returns `{ avg, variance }` or `null`.
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#### `timeouts.has(key)`
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Check if a key exists.
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#### `timeouts.delete(key)`
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Remove a key.
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#### `timeouts.clear()`
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Remove all entries.
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#### `timeouts.size`
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Number of entries.
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## How it works
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Uses TCP-style EWMA (exponentially weighted moving average) to track values:
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- `avg` blends 87.5% old + 12.5% new sample
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- `variance` blends 75% old + 25% new deviation
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Timeout for known keys: `(avg + 2 * variance) * attempt + jitter`
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Unknown keys use an aggressive fallback sequence to probe quickly.
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## License
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Apache 2.0
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+58
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declare module '@holepunchto/adaptive-timeout' {
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interface AdaptiveTimeoutOptions {
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maxSize?: number
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maxAge?: number
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fallback?: number[]
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min?: number
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max?: number
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jitter?: number
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}
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interface Stats {
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avg: number
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variance: number
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}
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declare class AdaptiveTimeout {
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constructor(opts?: AdaptiveTimeoutOptions)
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getValue(key: string): Stats | null
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put(key: string, value: number): Stats
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get(key: string, attempt?: number): number
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has(key: string): boolean
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delete(key: string): boolean
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clear(): void
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// Default - aggressive ramp
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static TimeoutAggressive: string[]
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// Linear - steady increase
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static TimeoutLinear: string[]
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// Exponential - slow start, rapid backoff
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static TimeoutExponential: string[]
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// Gentle - conservative, patient
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static TimeoutGentle: string[]
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// Fast - rapid fire retries
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static TimeoutFast: string[]
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// U-shape - long, short, long
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static TimeoutUShape: string[]
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// Inverse U - short, long, short
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static TimeoutInverseU: string[]
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// Sawtooth - alternating fast/slow
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static TimeoutSawtooth: string[]
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// Plateau - quick ramp then steady
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static TimeoutPlateau: string[]
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// Logarithmic - diminishing increases
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static TimeoutLogarithmic: string[]
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}
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export = AdaptiveTimeout
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}
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const Cache = require('xache')
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module.exports = class AdaptiveTimeout {
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constructor(opts = {}) {
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this._cache = new Cache({
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maxSize: opts.maxSize || 65536,
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maxAge: opts.maxAge || 10 * 60 * 1000 // 10 minutes
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})
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this._fallback = opts.fallback || AdaptiveTimeout.TimeoutExponential
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this._min = opts.min ?? 300
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this._max = opts.max || 4000
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this._jitter = opts.jitter ?? 256
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}
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// Default - aggressive ramp
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static TimeoutAggressive = [500, 750, 1000, 1500, 2000]
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// Linear - steady increase
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static TimeoutLinear = [500, 1000, 1500, 2000, 2500]
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// Exponential - slow start, rapid backoff
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static TimeoutExponential = [250, 500, 1000, 2000, 4000]
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// Gentle - conservative, patient
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static TimeoutGentle = [1000, 1250, 1500, 1750, 2000]
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// Fast - rapid fire retries
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static TimeoutFast = [200, 400, 600, 800, 1000]
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// U-shape - long, short, long
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static TimeoutUShape = [1500, 750, 500, 750, 1500]
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// Inverse U - short, long, short
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static TimeoutInverseU = [500, 1000, 1500, 1000, 500]
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// Sawtooth - alternating fast/slow
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static TimeoutSawtooth = [500, 1500, 500, 1500, 500]
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// Plateau - quick ramp then steady
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static TimeoutPlateau = [500, 1000, 2000, 2000, 2000]
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// Logarithmic - diminishing increases
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static TimeoutLogarithmic = [500, 1000, 1300, 1500, 1600]
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getValue(key) {
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return this._cache.get(key)
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}
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put(key, value) {
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let p = this._cache.get(key)
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if (!p) {
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p = { avg: value, variance: value >> 1 }
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} else {
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// blend 75% old + 25% new deviation
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p.variance += (Math.abs(p.avg - value) - p.variance) >> 2
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// blend 87.5% old + 12.5% new sample
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p.avg += (value - p.avg) >> 3
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}
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this._cache.set(key, p)
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return p
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}
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get(key, attempt = 1) {
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const p = this._cache.get(key)
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const jitter = (Math.random() * this._jitter) | 0
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if (p) {
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// known - use adaptive with linear backoff
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const base = p.avg + (p.variance << 1)
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const backoff = base * attempt
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return Math.min(Math.max(backoff + jitter, this._min), this._max)
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} else {
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// unknown - use aggressive fallback
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const base = this._fallback[Math.min(attempt - 1, this._fallback.length - 1)]
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return base + jitter
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}
|
||||
}
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|
||||
has(key) {
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return this._cache.has(key)
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||||
}
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||||
|
||||
delete(key) {
|
||||
return this._cache.delete(key)
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||||
}
|
||||
|
||||
clear() {
|
||||
this._cache.clear()
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||||
}
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}
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+42
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||||
{
|
||||
"name": "adaptive-timeout",
|
||||
"version": "1.0.1",
|
||||
"description": "adaptive-timeout",
|
||||
"main": "index.js",
|
||||
"exports": {
|
||||
"./package": "./package.json",
|
||||
".": {
|
||||
"types": "./index.d.ts",
|
||||
"default": "./index.js"
|
||||
}
|
||||
},
|
||||
"files": [
|
||||
"package.json",
|
||||
"index.js",
|
||||
"index.d.ts"
|
||||
],
|
||||
"devDependencies": {
|
||||
"brittle": "^3.19.0",
|
||||
"lunte": "^1.2.0",
|
||||
"prettier": "^3.6.2",
|
||||
"prettier-config-holepunch": "^2.0.0"
|
||||
},
|
||||
"scripts": {
|
||||
"format": "prettier . --write",
|
||||
"test": "prettier . --check && lunte && brittle-bare test/index.js",
|
||||
"lint": "lunte"
|
||||
},
|
||||
"repository": {
|
||||
"type": "git",
|
||||
"url": "https://github.com/holepunchto/adaptive-timeout.git"
|
||||
},
|
||||
"author": "Holepunch Inc",
|
||||
"license": "Apache-2.0",
|
||||
"bugs": {
|
||||
"url": "https://github.com/holepunchto/adaptive-timeout/issues"
|
||||
},
|
||||
"homepage": "https://github.com/holepunchto/adaptive-timeout",
|
||||
"dependencies": {
|
||||
"xache": "^1.2.1"
|
||||
}
|
||||
}
|
||||
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