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backend/apis/nodejs/node_modules/tarn/README.md
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[](https://travis-ci.org/Vincit/tarn.js)
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## Why yet another resource pool?
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Tarn is focused on robustness and ability to recover from errors. Tarn has timeouts for all operations
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that can fail or timeout so that you should never end up with pool full of crap. Tarn has a comprehensive
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test suite and we are committed to adding tests and fixing all bugs that are found.
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Tarn will always remain simple.
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## Install
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```
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npm install tarn
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```
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## Usage
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```js
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const { Pool, TimeoutError } = require('tarn');
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const pool = new Pool({
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// Function that creates a resource. You can either pass the resource
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// to the callback(error, resource) or return a promise that resolves the resource
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// (but not both) Callback syntax will be deprecated at some point.
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create: cb => {
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cb(null, new SomeResource());
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},
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// Validates a connection before it is used. Return true or false
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// from it. If false is returned, the resource is destroyed and
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// another one is acquired. Should return a Promise if validate is
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// an async function.
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validate: resource => {
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return true;
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},
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// Function that destroys a resource, should return a promise if
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// destroying is an asynchronous operation.
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destroy: someResource => {
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someResource.cleanup();
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},
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// logger function, noop by default
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log: (message, logLevel) => console.log(`${logLevel}: ${message}`)
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// minimum size
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min: 2,
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// maximum size
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max: 10,
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// acquire promises are rejected after this many milliseconds
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// if a resource cannot be acquired
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acquireTimeoutMillis: 30000,
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// create operations are cancelled after this many milliseconds
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// if a resource cannot be acquired
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createTimeoutMillis: 30000,
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// destroy operations are awaited for at most this many milliseconds
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// new resources will be created after this timeout
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destroyTimeoutMillis: 5000,
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// free resouces are destroyed after this many milliseconds
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idleTimeoutMillis: 30000,
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// how often to check for idle resources to destroy
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reapIntervalMillis: 1000,
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// how long to idle after failed create before trying again
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createRetryIntervalMillis: 200,
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// If true, when a create fails, the first pending acquire is
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// rejected with the error. If this is false (the default) then
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// create is retried until acquireTimeoutMillis milliseconds has
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// passed.
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propagateCreateError: false
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});
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// acquires a resource. The promise is rejected with `tarn.TimeoutError`
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// after `acquireTimeoutMillis` if a resource could not be acquired.
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const acquire = pool.acquire();
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// acquire can be aborted using the abort method.
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// If acquire had triggered creating a new resource in the pool
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// creation will continue and it is not aborted.
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acquire.abort();
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// the acquire object has a promise property that gets resolved with
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// the acquired resource
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try {
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const resource = await acquire.promise;
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} catch (err) {
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// if the acquire times out an error of class TimeoutError is thrown
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if (err instanceof TimeoutError) {
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console.log('timeout');
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}
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}
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// releases the resource.
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pool.release(resource);
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// returns the number of non-free resources
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pool.numUsed();
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// returns the number of free resources
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pool.numFree();
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// how many acquires are waiting for a resource to be released
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pool.numPendingAcquires();
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// how many asynchronous create calls are running
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pool.numPendingCreates();
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// waits for all resources to be returned to the pool and destroys them.
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// pool cannot be used after this.
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await pool.destroy();
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// The following examples add synchronous event handlers. For example, to
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// allow externally collecting pool behaviour diagnostic data.
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// If any of these hooks fail, all errors are caught and warnings are logged.
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// resource is acquired from pool
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pool.on('acquireRequest', eventId => {});
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pool.on('acquireSuccess', (eventId, resource) => {});
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pool.on('acquireFail', (eventId, err) => {});
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// resource returned to pool
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pool.on('release', resource => {});
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// resource was created and added to the pool
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pool.on('createRequest', eventId => {});
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pool.on('createSuccess', (eventId, resource) => {});
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pool.on('createFail', (eventId, err) => {});
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// resource is destroyed and evicted from pool
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// resource may or may not be invalid when destroySuccess / destroyFail is called
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pool.on('destroyRequest', (eventId, resource) => {});
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pool.on('destroySuccess', (eventId, resource) => {});
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pool.on('destroyFail', (eventId, resource, err) => {});
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// when internal reaping event clock is activated / deactivated
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pool.on('startReaping', () => {});
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pool.on('stopReaping', () => {});
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// pool is destroyed (after poolDestroySuccess all event handlers are also cleared)
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pool.on('poolDestroyRequest', eventId => {});
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pool.on('poolDestroySuccess', eventId => {});
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// remove single event listener
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pool.removeListener(eventName, listener);
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// remove all listeners from an event
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pool.removeAllListeners(eventName);
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```
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## Changelog
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### Master
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### 3.0.2 2021-11-29
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- Valid resources with rejected acquires are returned to the pool #68
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### 3.0.1 2020-10-25
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- Added triggering missing createFail event on timeout error - fixes #57
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### 3.0.0 2020-04-18
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- Async validation support, now validation resource function can return a promise #45
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- Fixed releasing abandoned resource after creation when create timeout #48
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Released as major version, because async validation support did require lots of internal changes, which may cause subtle difference in behavior.
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### 2.0.0 2019-06-02
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- Accidentally published breaking changes in 1.2.0. Unpublished it and published again with correct version number 2.0.0 #33
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### 1.2.0 2019-06-02 (UNPUBLISHED)
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- Passing unknown options throws an error #19 #32
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- Diagnostic event handlers to allow monitoring pool behaviour #14 #23
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- Dropped node 6 support #25 #28
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- pool.destroy() now always waits for all pending destroys to finish before resolving #29
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### 1.1.5 2019-04-06
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- Added changelog #22
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- Handle opt.destroy() being a promise with destroyTimeout #16
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- Explicitly silence bluebird warnings #17
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- Add strict typings via TypeScript #10
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