after-operation

after-operation

Helper for converting Google Compute Engine [tm] operation event-emitters to Promises

Deprecation Notice

Oct. 2019: Since GCE operations support operation.promise() you should probably use that instead.

Installation

npm i after-operation -S

Initialization

const after = require('after-operation');

Usage

Promise to return a value after an operation completes:

// some @google-cloud/compute method returns an operation
after(operation, onSuccessValue)
.then( (v)=>(assert.equal(v, onSuccessValue)) )
.catch(logTheOperationErrors)

Promise to call a function after the operation completes:

after(operation, (meta)=>(meta) )
.then(doSomethingUseful)
.catch(logTheOperationErrors)

Note that the success function gets fed with the metadata emitted in the operation 'complete' event.

By using the identity function as the success function, the promise will resolve to that metadata.

Note: after-operation will remove all operation listeners on either operation complete or operation error.

Related modules by other authors

npm: event-to-promise might be useful with other eventEmitters.

Copyright

2017 Paul Brewer - Economic and Financial Technology Consulting LLC [e-mail]

License

The MIT License

Trademarks

Google Compute Engine [tm] is a trademark of Google, Inc.

This software is not a product of Google, Inc.