Class: OperationContext<T, U>
OperationContext is used when call to an operation
Extends
EventEmitter
Type parameters
• T = any
type of input for this context
• U = any
type of output for this context
Properties
_body
protected
_body:string
Output
Source
packages/core/src/utils/context.ts:87
_promises
_promises:
Promise
<any
>[]
Contain all registered promises to this context
Source
packages/core/src/utils/context.ts:98
_sanitized
protected
_sanitized:any
Contain the sanitized request body if computed
Source
packages/core/src/utils/context.ts:82
_stream
_stream:
Writable
Output stream
Source
packages/core/src/utils/context.ts:120
_webda
protected
_webda:Core
<CoreEvents
>
Contain emitting Core
Source
packages/core/src/utils/context.ts:70
extensions
protected
extensions:Object
Allow extensions
Index signature
[key
: string
]: any
Source
packages/core/src/utils/context.ts:78
session
protected
session:Session
Session
Source
packages/core/src/utils/context.ts:74
__globalContext
static
protected
__globalContext:OperationContext
<any
,any
>
Source
packages/core/src/utils/context.ts:65
captureRejectionSymbol
static
readonly
captureRejectionSymbol: typeofcaptureRejectionSymbol
Inherited from
EventEmitter.captureRejectionSymbol
Source
packages/core/node_modules/@types/node/events.d.ts:328
captureRejections
static
captureRejections:boolean
Sets or gets the default captureRejection value for all emitters.
Inherited from
EventEmitter.captureRejections
Source
packages/core/node_modules/@types/node/events.d.ts:333
defaultMaxListeners
static
defaultMaxListeners:number
Inherited from
EventEmitter.defaultMaxListeners
Source
packages/core/node_modules/@types/node/events.d.ts:334
errorMonitor
static
readonly
errorMonitor: typeoferrorMonitor
This symbol shall be used to install a listener for only monitoring 'error'
events. Listeners installed using this symbol are called before the regular
'error'
listeners are called.
Installing a listener using this symbol does not change the behavior once an
'error'
event is emitted, therefore the process will still crash if no
regular 'error'
listener is installed.
Inherited from
EventEmitter.errorMonitor
Source
packages/core/node_modules/@types/node/events.d.ts:327
Methods
addAsyncRequest()
addAsyncRequest(
promise
):void
Register a promise with the context
Parameters
• promise: any
Returns
void
Source
packages/core/src/utils/context.ts:167
addListener()
addListener(
eventName
,listener
):this
Alias for emitter.on(eventName, listener)
.
Parameters
• eventName: string
| symbol
• listener: (...args
) => void
Returns
this
Inherited from
EventEmitter.addListener
Since
v0.1.26
Source
packages/core/node_modules/@types/node/events.d.ts:354
createStream()
createStream():
void
Create a buffer stream
Returns
void
Source
packages/core/src/utils/context.ts:296
emit()
emit(
eventName
, ...args
):boolean
Synchronously calls each of the listeners registered for the event namedeventName
, in the order they were registered, passing the supplied arguments
to each.
Returns true
if the event had listeners, false
otherwise.
const EventEmitter = require('events');
const myEmitter = new EventEmitter();
// First listener
myEmitter.on('event', function firstListener() {
console.log('Helloooo! first listener');
});
// Second listener
myEmitter.on('event', function secondListener(arg1, arg2) {
console.log(`event with parameters ${arg1}, ${arg2} in second listener`);
});
// Third listener
myEmitter.on('event', function thirdListener(...args) {
const parameters = args.join(', ');
console.log(`event with parameters ${parameters} in third listener`);
});
console.log(myEmitter.listeners('event'));
myEmitter.emit('event', 1, 2, 3, 4, 5);
// Prints:
// [
// [Function: firstListener],
// [Function: secondListener],
// [Function: thirdListener]
// ]
// Helloooo! first listener
// event with parameters 1, 2 in second listener
// event with parameters 1, 2, 3, 4, 5 in third listener
Parameters
• eventName: string
| symbol
• ...args: any
[]
Returns
boolean
Inherited from
EventEmitter.emit
Since
v0.1.26
Source
packages/core/node_modules/@types/node/events.d.ts:610
end()
end():
Promise
<void
>
Ensure the whole execution is finished
Returns
Promise
<void
>
Source
packages/core/src/utils/context.ts:192
eventNames()
eventNames(): (
string
|symbol
)[]
Returns an array listing the events for which the emitter has registered
listeners. The values in the array are strings or Symbol
s.
const EventEmitter = require('events');
const myEE = new EventEmitter();
myEE.on('foo', () => {});
myEE.on('bar', () => {});
const sym = Symbol('symbol');
myEE.on(sym, () => {});
console.log(myEE.eventNames());
// Prints: [ 'foo', 'bar', Symbol(symbol) ]
Returns
(string
| symbol
)[]
Inherited from
EventEmitter.eventNames
Since
v6.0.0
Source
packages/core/node_modules/@types/node/events.d.ts:669
getCurrentUser()
getCurrentUser<
K
>(refresh
):Promise
<K
>
Get the current user from session
Type parameters
• K extends User
Parameters
• refresh: boolean
= false
Returns
Promise
<K
>
Source
packages/core/src/utils/context.ts:361
getCurrentUserId()
getCurrentUserId():
any
Get the current user id from session
Returns
any
Source
packages/core/src/utils/context.ts:375
getExtension()
getExtension<
K
>(name
):K
Get an extension of the context
Type parameters
• K = any
Parameters
• name: string
of the extension
Returns
K
extension object
Source
packages/core/src/utils/context.ts:126
getHttpContext()
getHttpContext():
HttpContext
Get current http context
Returns
Source
packages/core/src/utils/context.ts:185
getInput()
getInput(
sanitizedOptions
):Promise
<T
>
Parameters
• sanitizedOptions: IOptions
& Object
= undefined
Returns
Promise
<T
>
Source
packages/core/src/utils/context.ts:198
getMaxListeners()
getMaxListeners():
number
Returns the current max listener value for the EventEmitter
which is either
set by emitter.setMaxListeners(n)
or defaults to defaultMaxListeners.
Returns
number
Inherited from
EventEmitter.getMaxListeners
Since
v1.0.0
Source
packages/core/node_modules/@types/node/events.d.ts:526
getOutput()
getOutput():
string
Get output as string, if a OutputStream is provided it will returned null
Returns
string
Source
packages/core/src/utils/context.ts:175
getOutputStream()
getOutputStream():
Writable
Get the HTTP stream to output raw data
Returns
Writable
Source
packages/core/src/utils/context.ts:271
getRawInput()
getRawInput(
_limit
,_timeout
):Promise
<Buffer
>
Parameters
• _limit: number
= undefined
• _timeout: number
= 60000
Returns
Promise
<Buffer
>
Source
packages/core/src/utils/context.ts:256
getRawInputAsString()
getRawInputAsString(
limit
,timeout
,encoding
?):Promise
<string
>
By default empty
Parameters
• limit: number
= undefined
• timeout: number
= 60000
• encoding?: BufferEncoding
Returns
Promise
<string
>
Source
packages/core/src/utils/context.ts:245
getRawStream()
getRawStream():
Readable
Returns
Readable
Source
packages/core/src/utils/context.ts:263
getSession()
getSession<
K
>():K
Get linked session
Type parameters
• K = Session
Returns
K
Source
packages/core/src/utils/context.ts:279
getWebda()
getWebda():
Core
<CoreEvents
>
Return the webda
Returns
Source
packages/core/src/utils/context.ts:159
init()
init():
Promise
<OperationContext
<T
,U
>>
Returns
Promise
<OperationContext
<T
, U
>>
Source
packages/core/src/utils/context.ts:354
isGlobal()
isGlobal():
boolean
Global context is the default Context
Whenever a request is internal to the system or not linked to a user request
Returns
boolean
Source
packages/core/src/utils/context.ts:386
listenerCount()
listenerCount(
eventName
):number
Returns the number of listeners listening to the event named eventName
.
Parameters
• eventName: string
| symbol
The name of the event being listened for
Returns
number
Inherited from
EventEmitter.listenerCount
Since
v3.2.0
Source
packages/core/node_modules/@types/node/events.d.ts:616
listeners()
listeners(
eventName
):Function
[]
Returns a copy of the array of listeners for the event named eventName
.
server.on('connection', (stream) => {
console.log('someone connected!');
});
console.log(util.inspect(server.listeners('connection')));
// Prints: [ [Function] ]
Parameters
• eventName: string
| symbol
Returns
Function
[]
Inherited from
EventEmitter.listeners
Since
v0.1.26
Source
packages/core/node_modules/@types/node/events.d.ts:539
log()
log(
level
, ...args
):void
Proxy for simplification
Parameters
• level: WorkerLogLevel
• ...args: any
[]
Returns
void
Source
packages/core/src/utils/context.ts:308
newSession()
newSession():
Promise
<Session
>
Create a new session
Returns
Promise
<Session
>
Source
packages/core/src/utils/context.ts:316
off()
off(
eventName
,listener
):this
Alias for emitter.removeListener()
.
Parameters
• eventName: string
| symbol
• listener: (...args
) => void
Returns
this
Inherited from
EventEmitter.off
Since
v10.0.0
Source
packages/core/node_modules/@types/node/events.d.ts:499
on()
on(
eventName
,listener
):this
Adds the listener
function to the end of the listeners array for the
event named eventName
. No checks are made to see if the listener
has
already been added. Multiple calls passing the same combination of eventName
and listener
will result in the listener
being added, and called, multiple
times.
server.on('connection', (stream) => {
console.log('someone connected!');
});
Returns a reference to the EventEmitter
, so that calls can be chained.
By default, event listeners are invoked in the order they are added. Theemitter.prependListener()
method can be used as an alternative to add the
event listener to the beginning of the listeners array.
const myEE = new EventEmitter();
myEE.on('foo', () => console.log('a'));
myEE.prependListener('foo', () => console.log('b'));
myEE.emit('foo');
// Prints:
// b
// a
Parameters
• eventName: string
| symbol
The name of the event.
• listener: (...args
) => void
The callback function
Returns
this
Inherited from
EventEmitter.on
Since
v0.1.101
Source
packages/core/node_modules/@types/node/events.d.ts:385
once()
once(
eventName
,listener
):this
Adds a one-timelistener
function for the event named eventName
. The
next time eventName
is triggered, this listener is removed and then invoked.
server.once('connection', (stream) => {
console.log('Ah, we have our first user!');
});
Returns a reference to the EventEmitter
, so that calls can be chained.
By default, event listeners are invoked in the order they are added. Theemitter.prependOnceListener()
method can be used as an alternative to add the
event listener to the beginning of the listeners array.
const myEE = new EventEmitter();
myEE.once('foo', () => console.log('a'));
myEE.prependOnceListener('foo', () => console.log('b'));
myEE.emit('foo');
// Prints:
// b
// a
Parameters
• eventName: string
| symbol
The name of the event.
• listener: (...args
) => void
The callback function
Returns
this
Inherited from
EventEmitter.once
Since
v0.3.0
Source
packages/core/node_modules/@types/node/events.d.ts:414
prependListener()
prependListener(
eventName
,listener
):this
Adds the listener
function to the beginning of the listeners array for the
event named eventName
. No checks are made to see if the listener
has
already been added. Multiple calls passing the same combination of eventName
and listener
will result in the listener
being added, and called, multiple
times.
server.prependListener('connection', (stream) => {
console.log('someone connected!');
});
Returns a reference to the EventEmitter
, so that calls can be chained.
Parameters
• eventName: string
| symbol
The name of the event.
• listener: (...args
) => void
The callback function
Returns
this
Inherited from
EventEmitter.prependListener
Since
v6.0.0
Source
packages/core/node_modules/@types/node/events.d.ts:634
prependOnceListener()
prependOnceListener(
eventName
,listener
):this
Adds a one-timelistener
function for the event named eventName
to the beginning of the listeners array. The next time eventName
is triggered, this
listener is removed, and then invoked.
server.prependOnceListener('connection', (stream) => {
console.log('Ah, we have our first user!');
});
Returns a reference to the EventEmitter
, so that calls can be chained.
Parameters
• eventName: string
| symbol
The name of the event.
• listener: (...args
) => void
The callback function
Returns
this
Inherited from
EventEmitter.prependOnceListener
Since
v6.0.0
Source
packages/core/node_modules/@types/node/events.d.ts:650
rawListeners()
rawListeners(
eventName
):Function
[]
Returns a copy of the array of listeners for the event named eventName
,
including any wrappers (such as those created by .once()
).
const emitter = new EventEmitter();
emitter.once('log', () => console.log('log once'));
// Returns a new Array with a function `onceWrapper` which has a property
// `listener` which contains the original listener bound above
const listeners = emitter.rawListeners('log');
const logFnWrapper = listeners[0];
// Logs "log once" to the console and does not unbind the `once` event
logFnWrapper.listener();
// Logs "log once" to the console and removes the listener
logFnWrapper();
emitter.on('log', () => console.log('log persistently'));
// Will return a new Array with a single function bound by `.on()` above
const newListeners = emitter.rawListeners('log');
// Logs "log persistently" twice
newListeners[0]();
emitter.emit('log');
Parameters
• eventName: string
| symbol
Returns
Function
[]
Inherited from
EventEmitter.rawListeners
Since
v9.4.0
Source
packages/core/node_modules/@types/node/events.d.ts:569
reinit()
reinit():
void
Remove sanitized body
Returns
void
Source
packages/core/src/utils/context.ts:286
removeAllListeners()
removeAllListeners(
event
?):this
Removes all listeners, or those of the specified eventName
.
It is bad practice to remove listeners added elsewhere in the code,
particularly when the EventEmitter
instance was created by some other
component or module (e.g. sockets or file streams).
Returns a reference to the EventEmitter
, so that calls can be chained.
Parameters
• event?: string
| symbol
Returns
this
Inherited from
EventEmitter.removeAllListeners
Since
v0.1.26
Source
packages/core/node_modules/@types/node/events.d.ts:510
removeListener()
removeListener(
eventName
,listener
):this
Removes the specified listener
from the listener array for the event namedeventName
.
const callback = (stream) => {
console.log('someone connected!');
};
server.on('connection', callback);
// ...
server.removeListener('connection', callback);
removeListener()
will remove, at most, one instance of a listener from the
listener array. If any single listener has been added multiple times to the
listener array for the specified eventName
, then removeListener()
must be
called multiple times to remove each instance.
Once an event is emitted, all listeners attached to it at the
time of emitting are called in order. This implies that anyremoveListener()
or removeAllListeners()
calls after emitting and before the last listener finishes execution
will not remove them fromemit()
in progress. Subsequent events behave as expected.
const myEmitter = new MyEmitter();
const callbackA = () => {
console.log('A');
myEmitter.removeListener('event', callbackB);
};
const callbackB = () => {
console.log('B');
};
myEmitter.on('event', callbackA);
myEmitter.on('event', callbackB);
// callbackA removes listener callbackB but it will still be called.
// Internal listener array at time of emit [callbackA, callbackB]
myEmitter.emit('event');
// Prints:
// A
// B
// callbackB is now removed.
// Internal listener array [callbackA]
myEmitter.emit('event');
// Prints:
// A
Because listeners are managed using an internal array, calling this will
change the position indices of any listener registered after the listener
being removed. This will not impact the order in which listeners are called,
but it means that any copies of the listener array as returned by
the emitter.listeners()
method will need to be recreated.
When a single function has been added as a handler multiple times for a single
event (as in the example below), removeListener()
will remove the most
recently added instance. In the example the once('ping')
listener is removed:
const ee = new EventEmitter();
function pong() {
console.log('pong');
}
ee.on('ping', pong);
ee.once('ping', pong);
ee.removeListener('ping', pong);
ee.emit('ping');
ee.emit('ping');
Returns a reference to the EventEmitter
, so that calls can be chained.
Parameters
• eventName: string
| symbol
• listener: (...args
) => void
Returns
this
Inherited from
EventEmitter.removeListener
Since
v0.1.26
Source
packages/core/node_modules/@types/node/events.d.ts:494
resetResponse()
resetResponse():
void
Remove everything that was about to be sent
Returns
void
Source
packages/core/src/utils/context.ts:324
setExtension()
setExtension(
name
,extension
):this
Parameters
• name: string
to add
• extension: any
object to store
Returns
this
Source
packages/core/src/utils/context.ts:151
setHeader()
setHeader(
_name
,_value
):void
For easier compatibility with WebContext On OperationContext this call is simply ignored
Parameters
• _name: string
• _value: string
Returns
void
Source
packages/core/src/utils/context.ts:134
setMaxListeners()
setMaxListeners(
n
):this
By default EventEmitter
s will print a warning if more than 10
listeners are
added for a particular event. This is a useful default that helps finding
memory leaks. The emitter.setMaxListeners()
method allows the limit to be
modified for this specific EventEmitter
instance. The value can be set toInfinity
(or 0
) to indicate an unlimited number of listeners.
Returns a reference to the EventEmitter
, so that calls can be chained.
Parameters
• n: number
Returns
this
Inherited from
EventEmitter.setMaxListeners
Since
v0.3.5
Source
packages/core/node_modules/@types/node/events.d.ts:520
write()
write(
output
,_encoding
?,_cb
?):boolean
Write data to the client
Parameters
• output: U
If it is an object it will be serialized with toPublicJSON, if it is a String it will be appended to the result, if it is a buffer it will replace the result
• _encoding?: string
• _cb?: (error
) => void
Returns
boolean
Source
packages/core/src/utils/context.ts:337
writeHead()
writeHead(
_code
,_headers
):void
For easier compatibility with WebContext On OperationContext this call is simply ignored
Parameters
• _code: number
• _headers: any
Returns
void
Source
packages/core/src/utils/context.ts:142
getEventListeners()
static
getEventListeners(emitter
,name
):Function
[]
Returns a copy of the array of listeners for the event named eventName
.
For EventEmitter
s this behaves exactly the same as calling .listeners
on
the emitter.
For EventTarget
s this is the only way to get the event listeners for the
event target. This is useful for debugging and diagnostic purposes.
const { getEventListeners, EventEmitter } = require('events');
{
const ee = new EventEmitter();
const listener = () => console.log('Events are fun');
ee.on('foo', listener);
getEventListeners(ee, 'foo'); // [listener]
}
{
const et = new EventTarget();
const listener = () => console.log('Events are fun');
et.addEventListener('foo', listener);
getEventListeners(et, 'foo'); // [listener]
}
Parameters
• emitter: EventEmitter
| _DOMEventTarget
• name: string
| symbol
Returns
Function
[]
Inherited from
EventEmitter.getEventListeners
Since
v15.2.0, v14.17.0
Source
packages/core/node_modules/@types/node/events.d.ts:299
listenerCount()
static
listenerCount(emitter
,eventName
):number
A class method that returns the number of listeners for the given eventName
registered on the given emitter
.
const { EventEmitter, listenerCount } = require('events');
const myEmitter = new EventEmitter();
myEmitter.on('event', () => {});
myEmitter.on('event', () => {});
console.log(listenerCount(myEmitter, 'event'));
// Prints: 2
Parameters
• emitter: EventEmitter
The emitter to query
• eventName: string
| symbol
The event name
Returns
number
Inherited from
EventEmitter.listenerCount
Since
v0.9.12
Deprecated
Since v3.2.0 - Use listenerCount
instead.
Source
packages/core/node_modules/@types/node/events.d.ts:271
on()
static
on(emitter
,eventName
,options
?):AsyncIterableIterator
<any
>
const { on, EventEmitter } = require('events');
(async () => {
const ee = new EventEmitter();
// Emit later on
process.nextTick(() => {
ee.emit('foo', 'bar');
ee.emit('foo', 42);
});
for await (const event of on(ee, 'foo')) {
// The execution of this inner block is synchronous and it
// processes one event at a time (even with await). Do not use
// if concurrent execution is required.
console.log(event); // prints ['bar'] [42]
}
// Unreachable here
})();
Returns an AsyncIterator
that iterates eventName
events. It will throw
if the EventEmitter
emits 'error'
. It removes all listeners when
exiting the loop. The value
returned by each iteration is an array
composed of the emitted event arguments.
An AbortSignal
can be used to cancel waiting on events:
const { on, EventEmitter } = require('events');
const ac = new AbortController();
(async () => {
const ee = new EventEmitter();
// Emit later on
process.nextTick(() => {
ee.emit('foo', 'bar');
ee.emit('foo', 42);
});
for await (const event of on(ee, 'foo', { signal: ac.signal })) {
// The execution of this inner block is synchronous and it
// processes one event at a time (even with await). Do not use
// if concurrent execution is required.
console.log(event); // prints ['bar'] [42]
}
// Unreachable here
})();
process.nextTick(() => ac.abort());
Parameters
• emitter: EventEmitter
• eventName: string
The name of the event being listened for
• options?: StaticEventEmitterOptions
Returns
AsyncIterableIterator
<any
>
that iterates eventName
events emitted by the emitter
Inherited from
EventEmitter.on
Since
v13.6.0, v12.16.0
Source
packages/core/node_modules/@types/node/events.d.ts:254
once()
once(emitter, eventName, options)
static
once(emitter
,eventName
,options
?):Promise
<any
[]>
Creates a Promise
that is fulfilled when the EventEmitter
emits the given
event or that is rejected if the EventEmitter
emits 'error'
while waiting.
The Promise
will resolve with an array of all the arguments emitted to the
given event.
This method is intentionally generic and works with the web platform EventTarget interface, which has no special'error'
event
semantics and does not listen to the 'error'
event.
const { once, EventEmitter } = require('events');
async function run() {
const ee = new EventEmitter();
process.nextTick(() => {
ee.emit('myevent', 42);
});
const [value] = await once(ee, 'myevent');
console.log(value);
const err = new Error('kaboom');
process.nextTick(() => {
ee.emit('error', err);
});
try {
await once(ee, 'myevent');
} catch (err) {
console.log('error happened', err);
}
}
run();
The special handling of the 'error'
event is only used when events.once()
is used to wait for another event. If events.once()
is used to wait for the
'error'
event itself, then it is treated as any other kind of event without
special handling:
const { EventEmitter, once } = require('events');
const ee = new EventEmitter();
once(ee, 'error')
.then(([err]) => console.log('ok', err.message))
.catch((err) => console.log('error', err.message));
ee.emit('error', new Error('boom'));
// Prints: ok boom
An AbortSignal
can be used to cancel waiting for the event:
const { EventEmitter, once } = require('events');
const ee = new EventEmitter();
const ac = new AbortController();
async function foo(emitter, event, signal) {
try {
await once(emitter, event, { signal });
console.log('event emitted!');
} catch (error) {
if (error.name === 'AbortError') {
console.error('Waiting for the event was canceled!');
} else {
console.error('There was an error', error.message);
}
}
}
foo(ee, 'foo', ac.signal);
ac.abort(); // Abort waiting for the event
ee.emit('foo'); // Prints: Waiting for the event was canceled!
Parameters
• emitter: _NodeEventTarget
• eventName: string
| symbol
• options?: StaticEventEmitterOptions
Returns
Promise
<any
[]>
Inherited from
EventEmitter.once
Since
v11.13.0, v10.16.0
Source
packages/core/node_modules/@types/node/events.d.ts:194
once(emitter, eventName, options)
static
once(emitter
,eventName
,options
?):Promise
<any
[]>
Parameters
• emitter: _DOMEventTarget
• eventName: string
• options?: StaticEventEmitterOptions
Returns
Promise
<any
[]>
Inherited from
EventEmitter.once
Source
packages/core/node_modules/@types/node/events.d.ts:195
setMaxListeners()
static
setMaxListeners(n
?, ...eventTargets
?):void
const {
setMaxListeners,
EventEmitter
} = require('events');
const target = new EventTarget();
const emitter = new EventEmitter();
setMaxListeners(5, target, emitter);
Parameters
• n?: number
A non-negative number. The maximum number of listeners per EventTarget
event.
• ...eventTargets?: (EventEmitter
| _DOMEventTarget
)[]
Returns
void
Inherited from
EventEmitter.setMaxListeners
Since
v15.4.0
Source
packages/core/node_modules/@types/node/events.d.ts:317