Jaysonic

Class: JsonRpcClientProtocol

JsonRpcClientProtocol

Creates an instance of the base client protocol class. This is the class that all other client protocols inherit from.

new JsonRpcClientProtocol(factory, version, delimiter)

JsonRpcClientProtocol contructor

Parameters:
Name Type Description
factory class

Instance of JsonRpcClientFactory
version 1 | 2

JSON-RPC version to make requests with
delimiter string

Delimiter to use for message buffer
Properties:
Name Type Description
factory class

Instance of JsonRpcClientFactory
connector class

The socket instance for the client
version 1 | 2

JSON-RPC version to use
delimiter string

Delimiter to use for message buffer
message_id number

Current message ID
serving_message_id number

Current message ID. Used for external functions to hook into
pendingCalls Object

Key value pairs for pending message IDs to promise resolve/reject objects
responseQueue Object.<(string|number), JSON>

Key value pairs for outstanding message IDs to response object
server Object

Server host and port object {host: "x.x.x.x", port: xxxx}
messageBuffer class

Instance of MessageBuffer
Source:

Methods

batch(requests)

Used to send a batch request to the server.

Recommend using message to construct the message objects.

Will use the IDs for the requests in the batch in an array as the keys for pendingCalls.

How a client should associate batch responses to their requests is not in the spec, so this is the solution.

Parameters:
Name Type Description
requests Array

An array of valid JSON-RPC message objects
Source:
Returns:

Promise

Example
client.batch([client.message("foo", ["bar"]), client.message("hello", [], false)])

connect()

Make the connection to the server.

Calls setConnector to establish the client connection.

Calls listen if connection was successful, and will resolve the promise.

Will retry connection on the connectionTimeout interval. Number of connection retries is based on remainingRetries.

If null is set for number of retries, then connections will attempt indefinitely.

Will reject the promise if connect or re-connect attempts fail and there are no remaining retries.

Source:
Returns:

Promise

end(cb)

Ends connection to the server.

Sets JsonRpcClientFactory.pcolInstance to undefined

Clears the connection timeout

Parameters:
Name Type Description
cb function

Called when connection is sucessfully closed
Source:

getBatchResponse(batch)

Returns the batch response.

Overwrite if class needs to reformat response in anyway (i.e. in HttpClientProtocol)

Parameters:
Name Type Description
batch Array

Array of valid JSON-RPC message objects
Source:

getResponse(id)

Get the outstanding request object for the given ID.

Parameters:
Name Type Description
id string | number

ID of outstanding request
Source:

gotBatch(message)

Called when the received message is a batch.

Calls gotNotification for every notification in the batch.

Calls gotBatchResponse otherwise.

Parameters:
Name Type Description
message Array.<JSON>

A valid JSON-RPC batch message
Source:

gotBatchResponse(batch)

Associate the ids in the batch message to their corresponding pendingCalls.

Will call _resolveOrRejectBatch when object is determined.

Parameters:
Name Type Description
batch Array

Array of valid JSON-RPC message objects
Source:

gotError(error)

Calls rejectPendingCalls with error object.

If the object cannot be parsed, then an unkown error code is sent with a null id.

Parameters:
Name Type Description
error string

Stringified JSON-RPC error object
Source:

gotNotification(message)

Called when the received message is a notification. Emits an event using message.method as the name. The data passed to the event is the message.

Parameters:
Name Type Description
message JSON

A valid JSON-RPC message object
Source:

gotResponse(message)

Called when the received message is a response object from the server.

Gets the response using getResponse.

Resolves the message and removes it from the responseQueue. Cleans up any outstanding timers.

Parameters:
Name Type Description
message JSON

A valid JSON-RPC message object
Source:

listen()

Setup this.listner.on("data") event to listen for data coming into the client.

Pushes received data into messageBuffer and calls _waitForData

Source:

message(method, params [, id])

Generate a stringified JSON-RPC message object.

Parameters:
Name Type Argument Default Description
method string

Name of the method to use in the request
params Array | JSON

Params to send
id boolean <optional>
 true

If true it will use instances message_id for the request id, if false will generate a notification request
Source:
Example
client.message("hello", ["world"]) // returns {"jsonrpc": "2.0", "method": "hello", "params": ["world"], "id": 1}
client.message("hello", ["world"], false) // returns {"jsonrpc": "2.0", "method": "hello", "params": ["world"]}

notify(method, params)

Send a notification to the server.

Promise will resolve if the request was sucessfully sent, and reject if there was an error sending the request.

Parameters:
Name Type Description
method string

Name of the method to use in the notification
params Array | JSON

Params to send
Source:
Returns:

Promise

Example
client.notify("hello", ["world"])

rejectPendingCalls(error)

Reject the pending call for the given ID is in the error object.

If the error object has a null id, then log the message to the logging .getLogger().

Parameters:
Name Type Description
error string

Stringified JSON-RPC error object
Source:

request()

Method used to call message, notify and send

Source:
Returns:

Object

Example
client.request().send("hello", ["world"])
client.request().notify("foo")
client.request().message("foo", ["bar"])

send(method, params)

Send a request to the server

Promise will resolve when a response has been received for the request.

Promise will reject if the server responds with an error object, or if the response is not received within the set requestTimeout

Parameters:
Name Type Description
method string

Name of the method to use in the request
params Array | JSON

Params to send
Source:
Returns:

Promise

Example
client.send("hello", {"foo": "bar"})

<abstract> setConnector()

Set the connector attribute for the protocol instance. The connector is essentially the socket or connection instance for the client.

Source:

verifyData(chunk)

Verify the incoming data returned from the messageBuffer

Throw an error if its not a valid JSON-RPC object.

Call gotNotification if the message a notification.

Call gotBatch if the message is a batch request.

Parameters:
Name Type Description
chunk string

Data to verify
Source:

write(request [, cb])

Send a message to the server

Parameters:
Name Type Argument Description
request string

Stringified JSON-RPC message object
cb function <optional>

Callback function to be called when message has been sent
Source: