@kronos-integration/interceptor

intercepects / modifies requests as they pass between endpoints

const { Interceptor } from '@kronos-integration/interceptor';

const endpoint = { get name() { return 'aName'; }, receive() {}};
const interceptor = new Interceptor();

const response = interceptor.receive(endpoint, arg1, arg2);

API

Table of Contents

• Interceptor
  • Parameters
  • type
  • configurationAttributes
  • configure
    • Parameters
  • toJSONWithOptions
    • Parameters
  • reset
  • receive
    • Parameters
  • configurationAttributes
• LimitingInterceptor
  • Parameters
  • name
• LoggingInterceptor
  • name
• StatsCollectorInterceptor
  • receive
    • Parameters
  • name
• TemplateInterceptor
  • name
• TimeoutInterceptor
  • name
• rejectUnlessResolvedWithin
  • Parameters
• expand
  • Parameters

Interceptor

Base interceptor. The base class for all the interceptors Calls configure() and reset().

Parameters

• config Object The interceptor configuration object.

type

The instance method returning the type. Defaults to the constructors name (class name)

Returns string

configurationAttributes

Meta description of the configuration.

Returns Object

configure

Takes attribute values from config parameters and copies them over to the object. Copying is done according to configurationAttributes. Which means we loop over all configuration attributes and then for each attribute decide if we use the default, call a setter function or simply assign the attribute value.

Parameters

• config Object

toJSONWithOptions

Deliver the json representation.

Parameters

• options

Returns Object json representation

reset

Forget all accumulated information.

receive

The receive method. This method receives the request from the leading interceptor and calls the trailing interceptor.

Parameters

• endpoint Endpoint
• next Function
• args Array<any> the request from the leading interceptor

Returns Promise

configurationAttributes

Meta description of the configuration

Returns Object

LimitingInterceptor

Extends Interceptor

Limits the number of concurrent requests. Requests can be delayed or rejected. Sample config: [ { count: 20 }, { count: 10, delay: 100 }, { count: 5, delay: 10 } ] 1 - 4 : no delay 5 - 9 : 10ms delay 10 - 19 : 100ms delay 20 : reject default is to reject when more than 10 requests are on the way

Parameters

• config

name

Returns string 'request-limit'

LoggingInterceptor

Extends Interceptor

logs args and result

name

Returns string 'logging'

StatsCollectorInterceptor

Extends Interceptor

Interceptor to collect processing time, number of processed and failed requests.

receive

Logs the time the requests takes

Parameters

• endpoint
• args ...any

name

Returns string 'collect-request-stats'

TemplateInterceptor

Extends Interceptor

Map params into requests.

name

Returns string 'template'

TimeoutInterceptor

Extends Interceptor

Rejects a request if it does not resolve in a given time.

name

Returns string 'timeout'

rejectUnlessResolvedWithin

Rejects promise when it is not resolved within given timeout.

Parameters

• promise Promise
• timeout number in miliseconds
• name string

Returns Promise

expand

Expands '{{exp}}' expressions.

Parameters

• value any
• params Object

Returns any expanded value

install

With npm do:

npm install @kronos-integration/interceptor

license

BSD-2-Clause