Web Utilities

hethers.utils.fetchJson( urlOrConnectionInfo [ , json [ , processFunc ] ] ) ⇒ Promise<any>

Fetch and parse the JSON content from urlOrConnectionInfo, with the optional body json and optionally processing the result with processFun before returning it.

hethers.utils.poll( pollFunc [ , options ] ) ⇒ Promise<any>

Repeatedly call pollFunc using the PollOptions until it returns a value other than undefined.

ConnectionInfo

connection.url ⇒ string

The URL to connect to.

connection.user ⇒ string

The username to use for Basic Authentication. The default is null (i.e. do not use basic authentication)

connection.password ⇒ string

The password to use for Basic Authentication. The default is null (i.e. do not use basic authentication)

connection.allowInsecureAuthentication ⇒ boolean

Allow Basic Authentication over non-secure HTTP. The default is false.

connection.timeout ⇒ number

How long to wait before rejecting with a timeout error.

connection.headers ⇒ {[key:string]:string}

Additional headers to include in the connection.

PollOptions

options.timeout ⇒ number

The amount of time allowed to elapse before triggering a timeout error.

options.floor ⇒ number

The minimum time limit to allow for Exponential Backoff.

The default is 0s.

options.ceiling ⇒ number

The maximum time limit to allow for Exponential Backoff.

The default is 10s.

options.interval ⇒ number

The interval used during Exponential Backoff calculation.

The default is 250ms.

options.retryLimit ⇒ number

The number of times to retry in the event of an error or undefined is returned.

options.onceBlock ⇒ Provider

If this is specified, the polling will wait on new blocks from provider before attempting the pollFunc again.

options.oncePoll ⇒ Provider

If this is specified, the polling will occur on each poll cycle of provider before attempting the pollFunc again.