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fiddle: initial work on loading a client-side db file. Works but requires some cleanup. Export is not yet implemented.

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FossilOrigin-Name: 0fa8378c006fcf2311772d36cf2e3c2cd8e8648f671de89ee9832e2e1a06ef49
This commit is contained in:
stephan
2022-05-24 19:01:21 +00:00
parent 6af03b469e
commit de1e02ee52
7 changed files with 173 additions and 39 deletions
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77
ext/fiddle/fiddle-worker.js
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@@ -159,30 +159,73 @@ self.Module = {
}
};
const shellExec = function f(sql){
if(!f._) f._ = Module.cwrap('fiddle_exec', null, ['string']);
if(Module._isDead){
wMsg('stderr', "shell module has exit()ed. Cannot run SQL.");
return;
}
wMsg('working','start');
try {
if(f._running) wMsg('stderr','Cannot run multiple commands concurrently.');
else{
f._running = true;
f._(sql);
const Sqlite3Shell = {
exec: function f(sql){
if(!f._) f._ = Module.cwrap('fiddle_exec', null, ['string']);
if(Module._isDead){
wMsg('stderr', "shell module has exit()ed. Cannot run SQL.");
return;
}
} finally {
wMsg('working','end');
delete f._running;
wMsg('working','start');
try {
if(f._running) wMsg('stderr','Cannot run multiple commands concurrently.');
else{
f._running = true;
f._(sql);
}
} finally {
wMsg('working','end');
delete f._running;
}
},
/* Interrupt can't work: this Worker is tied up working, so won't get the
interrupt event which would be needed to perform the interrupt. */
interrupt: function f(){
if(!f._) f._ = Module.cwrap('fiddle_interrupt', null);
wMsg('stdout',"Requesting interrupt.");
f._();
}
};
self.onmessage = function(ev){
self.onmessage = function f(ev){
ev = ev.data;
if(!f.cache){
f.cache = {
prevFilename: null
};
}
//console.debug("worker: onmessage.data",ev);
switch(ev.type){
case 'shellExec': shellExec(ev.data); return;
case 'shellExec': Sqlite3Shell.exec(ev.data); return;
case 'interrupt': Sqlite3Shell.interrupt(); return;
case 'open': {
/* Expects: {
buffer: ArrayBuffer | Uint8Array,
filename: for logging/informational purposes only
} */
const opt = ev.data;
let buffer = opt.buffer;
if(buffer instanceof Uint8Array){
}else if(buffer instanceof ArrayBuffer){
buffer = new Uint8Array(buffer);
}else{
wMsg('stderr',"'open' expects {buffer:Uint8Array} containing an uploaded db.");
return;
}
if(f.cache.prevFilename){
FS.unlink(f.cache.prevFilename);
/* Noting that it might not actually be removed until
the current db handle closes it. */
f.cache.prevFilename = null;
}
const fn = "db-"+((Math.random() * 10000000) | 0)+
"-"+((Math.random() * 10000000) | 0)+".sqlite3";
FS.createDataFile("/", fn, buffer, true, true);
f.cache.prevFilename = fn;
Sqlite3Shell.exec(".open /"+fn);
wMsg('stdout',"Replaced DB with "+(opt.filename || fn)+".");
return;
}
};
console.warn("Unknown fiddle-worker message type:",ev);
};