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Tweaks to the Worker1 and Promiser APIs prompted by documenting them.

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FossilOrigin-Name: c68b9aa160e2c1197ae7eb06a634017ac2b281393074afa4582762d5458c6889
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stephan
2022-09-30 23:02:11 +00:00
parent e67a0f40e4
commit ae589b69db
5 changed files with 27 additions and 33 deletions
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17
ext/wasm/sqlite3-worker1-promiser.js
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@ -32,10 +32,10 @@
It requires a configuration object with the following properties:
- `worker` (required): a Worker instance which loads
`sqlite3-worker1.js` or a functional equivalent. Note that this
function replaces the worker.onmessage property. This property
may alternately be a function, in which case this function
re-assigns this property with the result of calling that
`sqlite3-worker1.js` or a functional equivalent. Note that the
promiser factory replaces the worker.onmessage property. This
config option may alternately be a function, in which case this
function re-assigns this property with the result of calling that
function, enabling delayed instantiation of a Worker.
- `onready` (optional, but...): this callback is called with no
@ -147,6 +147,14 @@
*/
self.sqlite3Worker1Promiser = function callee(config = callee.defaultConfig){
// Inspired by: https://stackoverflow.com/a/52439530
if(1===arguments.length && 'function'===typeof arguments[0]){
const f = config;
config = Object.assign(Object.create(null), callee.defaultConfig);
config.onready = f;
}
/* Maintenance reminder: when passed a config object, the reference
must be used as-is, instead of normalizing it to another object,
so that we can communicate the dbId through it. */
const handlerMap = Object.create(null);
const noop = function(){};
const err = config.onerror || noop;
@ -156,6 +164,7 @@ self.sqlite3Worker1Promiser = function callee(config = callee.defaultConfig){
return msg.type+'#'+(idTypeMap[msg.type] = (idTypeMap[msg.type]||0) + 1);
};
const toss = (...args)=>{throw new Error(args.join(' '))};
if(!config.worker) config.worker = callee.defaultConfig.worker;
if('function'===typeof config.worker) config.worker = config.worker();
config.worker.onmessage = function(ev){
ev = ev.data;