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cabotage.js
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cabotage.js
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const graphql = require('graphql');
var { connected } = require('./socketdata.js');
const db = {};
const mroot = {};
const otypes = {};
const operations = {};
var storedSchema = '';
function registerResolver(...rootFn){
if(!rootFn){
throw new Error('registerResolver :: registerResolver must take at least one resolver function.');
}
rootFn.forEach((fn) => {
if(fn.name.length <= 0){
throw new Error('registerResolver :: registerResolver can not take anonymous functions as arguments');
}
mroot[fn.name] = wrapResolver(fn);
});
}
function getRoot(){
return mroot;
}
function wrapResolver(fn){
if(operations[fn.name].type === 'Mutation'){
return function (...args){
let ret = fn(...args);
if(operations[fn.name].type === 'Mutation'){
triggerType(ret.constructor.name, ret)
}
return ret;
}
}else{
return fn;
}
}
function registerType(classFn, ...uniqKeys){
if(typeof classFn !== 'function'){
throw new Error('registerType :: registerType must take in a constructor function as first argument');
}
if(!uniqKeys){
throw new Error('registerType :: registerType did not recieve any keys as arguments');
}
otypes[classFn.name] = {
name: classFn.name,
classType: classFn,
keys: uniqKeys,
};
}
function parseSchema(schema) {
if (!schema) {
throw new Error('parseSchema :: parseSchema must take in a schema string');
}
storedSchema = schema;
let schemaSource = new graphql.Source(schema);
let parsedSchema = graphql.parse(schema);
parsedSchema.definitions.forEach((ele) => {
if (ele.name.value === 'Query' || ele.name.value === 'Mutation') {
ele.fields.forEach((field) => {
operations[field.name.value] = {
name: field.name.value,
type: ele.name.value,
value: field.type.name.value
}
});
}
});
}
function findFields(obj, store) {
var collection = obj.definitions[0].selectionSet.selections
function findFieldshelper(val, store) {
store[val.name.value] = []
val.selectionSet.selections.forEach(field => {
if (field.selectionSet) {
store[val.name.value].push(findFieldshelper(field, {}))
}
else store[val.name.value].push(field.name.value)
});
return store
}
collection.forEach((val) => {
findFieldshelper(val, store)
});
}
function handleSubscribe(query, socketid) {
const root = Object.assign({}, getRoot());
connected[socketid].query = query.query
const parseQuery = graphql.parse(query.query);
connected[socketid].operationFields = {};
findFields(parseQuery, connected[socketid].operationFields)
Object.keys(root).forEach((resolverName) => {
if (operations[resolverName].type === 'Query') {
let oldResolver = root[resolverName];
root[resolverName] = function (...args) {
let ret = oldResolver(...args);
let uniqIdentifier = generateUniqueIdentifier(operations[resolverName].value, ret);
db[uniqIdentifier] = !db[uniqIdentifier] ? [socketid] : [...db[uniqIdentifier], socketid];
return ret;
}
}
});
graphql.graphql(
graphql.buildSchema(storedSchema),
query.query,
root
).then((result) => {
connected[socketid].socket.emit(socketid, result);
});
}
function handleDisconnect(socketid){
Object.keys(db).forEach( (uniqIdentifier) => {
let socketIndex = db[uniqIdentifier].indexOf(socketid);
if(socketIndex >= 0){
db[uniqIdentifier].splice(socketIndex, 1);
}
});
delete connected[socketid];
}
function triggerType(typename, obj){
if(otypes[typename] === undefined){
throw new Error(`triggerType :: There exists no registered type named ${typename}`);
}
let uniqIdentifier = generateUniqueIdentifier(typename, obj);
db[uniqIdentifier].forEach((socket) => {
if(connected[socket] !== undefined){
db[uniqIdentifier].forEach((socketid) => {
connected[socketid].emit(socketid, obj);
});
}
});
}
function generateUniqueIdentifier(typename, obj){
if(otypes[typename] === undefined){
throw new Error(`generateUniqueIdentifier :: There exists no registered type named ${typename}`);
}
let uniqKeys = otypes[typename].keys;
return typename + uniqKeys.reduce((acc, curr) => {
return acc + curr + obj[curr];
}, '');
}
module.exports = {
registerResolver,
getRoot,
registerType,
parseSchema,
handleSubscribe,
handleDisconnect,
triggerType
};