/**
* Run a single Canvas function.
*
* @param {*} server - The Kibana server object
* @param {*} handlers - The Canvas handlers
* @param {*} fnCall - Describes the function being run `{ functionName, args, context }`
*/
async function runFunction(server, handlers, fnCall) {
const { functionName, args, context } = fnCall;
const types = server.plugins.interpreter.types.toJS();
const { deserialize } = serializeProvider(types);
const fnDef = server.plugins.interpreter.serverFunctions.toJS()[functionName];
if (!fnDef) {
throw Boom.notFound(`Function "${functionName}" could not be found.`);
}
return fnDef.fn(deserialize(context), args, handlers);
}
io.on('connection', async socket => {
// 'request' is the modified hapi request object
const request = await getModifiedRequest(server, socket);
if (!request) return; // do nothing without the request object
const types = server.plugins.interpreter.types.toJS();
const { serialize, deserialize } = serializeProvider(types);
// I'd love to find a way to generalize all of these, but they each need a different set of things
// Note that ORDER MATTERS here. The environments will be tried in this order. Do not reorder this array.
const routeExpression = routeExpressionProvider([
thread({ onFunctionNotFound, serialize, deserialize }),
serverEnv({ onFunctionNotFound, request, server }),
browser({ onFunctionNotFound, socket, serialize, deserialize }),
]);
function onFunctionNotFound(ast, context) {
return routeExpression(ast, context);
}
socket.on('getFunctionList', () => {
socket.emit('functionList', server.plugins.interpreter.serverFunctions.toJS());
});
socket.on('run', async ({ ast, context, id }) => {
try {
const value = await routeExpression(ast, deserialize(context));
socket.emit(`resp:${id}`, { type: 'msgSuccess', value: serialize(value) });
} catch (err) {
// TODO: I don't think it is possible to hit this right now? Maybe ever?
socket.emit(`resp:${id}`, { type: 'msgError', value: err });
}
});
socket.on('disconnect', () => {
// remove all listeners on disconnect
socket.removeAllListeners();
});
});