setLogger -- set up logging for a JSON-RPC server

Usage:

setLogger(server, f)
Inputs:
- server, a JSON-RPC server,
- f, a function,

Description

This method sets a custom logging function for the server. The provided logger function will be used to log relevant server activities, such as incoming requests and responses. This allows for flexible logging and monitoring, enabling users to integrate with existing logging systems or implement custom logging behavior. The function f should accept a single string.

Let's set it up so that our server logs both to stderr and to a file.

i1 : server = new JSONRPCServer

o1 = server

o1 : JSONRPCServer

i2 : registerMethod(server, "sum", plus)

i3 : logfile = temporaryFileName();

i4 : setLogger(server, x -> (printerr x; logfile << x << endl;));

i5 : handleRequest(server, makeRequest("sum", {2, 3}, 1))
 -- received request: {"method": "sum", "id": 1, "jsonrpc": "2.0", "params": [2, 3]}
 -- calling method "sum" with params [2, 3]
 -- method "sum" returned: 5
 -- sending response: {"result": 5, "jsonrpc": "2.0", "id": 1}

o5 = {"result": 5, "jsonrpc": "2.0", "id": 1}

i6 : handleRequest(server, makeRequest("sum", {4, 5}, 2))
 -- received request: {"method": "sum", "id": 2, "jsonrpc": "2.0", "params": [4, 5]}
 -- calling method "sum" with params [4, 5]
 -- method "sum" returned: 9
 -- sending response: {"result": 9, "jsonrpc": "2.0", "id": 2}

o6 = {"result": 9, "jsonrpc": "2.0", "id": 2}

i7 : logfile << close;

i8 : get logfile

o8 = received request: {"method": "sum", "id": 1, "jsonrpc": "2.0", "params": [2, 3]}
     calling method "sum" with params [2, 3]
     method "sum" returned: 5
     sending response: {"result": 5, "jsonrpc": "2.0", "id": 1}
     received request: {"method": "sum", "id": 2, "jsonrpc": "2.0", "params": [4, 5]}
     calling method "sum" with params [4, 5]
     method "sum" returned: 9
     sending response: {"result": 9, "jsonrpc": "2.0", "id": 2}

Ways to use setLogger:

setLogger(JSONRPCServer,Function)

For the programmer

The object setLogger is a method function.

The source of this document is in JSONRPC.m2:484:0.