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const ws = new WebSocket("ws://localhost:8888");
const unix = {
EPERM: 1,
ENOENT: 2,
ESRCH: 3,
EINTR: 4,
EIO: 5,
ENXIO: 6,
// Unix file types
S_IFMT: 0170000, // type of file mask
S_IFIFO: 010000, // named pipe (fifo)
S_IFCHR: 020000, // character special
S_IFDIR: 040000, // directory
S_IFBLK: 060000, // block special
S_IFREG: 0100000, // regular
S_IFLNK: 0120000, // symbolic link
S_IFSOCK: 0140000, // socket
}
function UnixError(error) {
this.name = "UnixError";
this.error = error;
}
UnixError.prototype = Error.prototype;
function getTab(id) {
return new Promise((resolve, reject) => chrome.tabs.get(id, resolve));
}
function queryTabs() {
return new Promise((resolve, reject) => chrome.tabs.query({}, resolve));
}
function sendDebuggerCommand(tab, method, commandParams) {
return new Promise(resolve => chrome.debugger.sendCommand({tabId: id}, method, commandParams, resolve));
}
const fhManager = (function() {
const handles = {};
let nextFh = 0;
return {
allocate(obj) { // -> fh
const fh = nextFh++;
handles[fh] = obj;
return fh;
},
ref(fh) {
if (!handles[fh]) throw new UnixError(unix.EIO);
return handles[fh];
},
free(fh) {
delete handles[fh];
}
};
})();
// tabs/by-id/ID/title
// tabs/by-id/ID/url
// tabs/by-id/ID/console
// tabs/by-id/ID/mem (?)
// tabs/by-id/ID/cpu (?)
// tabs/by-id/ID/screenshot.png
// tabs/by-id/ID/printed.pdf
// tabs/by-id/ID/control
// tabs/by-id/ID/sources/
function pathComponent(path, i) {
const components = path.split('/');
return components[i >= 0 ? i : components.length + i];
}
const router = {
"tabs": {
"by-id": {
async readdir() {
const tabs = await queryTabs();
return tabs.map(tab => String(tab.id));
},
"*": {
"url": {
async getattr() {
return {
st_mode: unix.S_IFREG | 0444,
st_nlink: 1,
st_size: 100 // FIXME
};
},
async open(path) {
return fhManager.allocate(await getTab(parseInt(pathComponent(path, -2))));
},
async read(path, fh, size, offset) {
const tab = fhManager.ref(fh);
return tab.url.substr(offset, size);
},
async release(path, fh) {
fhManager.free(fh);
}
},
/* "title": fileFromProperty('title'),
* "sources": folderFromResource(
* (tab, path) => new Promise(resolve => chrome.debugger.attach(
* { tabId: tab.id }, "1-3", resolve)),
* {
* readdir() {
* }
* }*/
}
}
}
};
function findRoute(path) {
let route = router;
for (let segment of path.split("/")) {
if (segment === "") continue;
route = route[segment] || route["*"];
if (!route) throw new UnixError(unix.ENOENT);
}
return route;
}
async function getattr(path) {
let route = findRoute(path);
if (route.getattr) {
return route.getattr(path);
} else {
return {
st_mode: unix.S_IFDIR | 0755,
st_nlink: 3
};
}
}
async function readdir(path) {
let route = findRoute(path);
if (route.readdir) return route.readdir(path);
return Object.keys(route);
}
async function open(path) {
let route = findRoute(path);
if (route.open) return route.open(path);
}
async function read(path, fh, size, offset) {
let route = findRoute(path);
if (route.read) return route.read(path, fh, size, offset);
}
async function release(path, fh) {
let route = findRoute(path);
if (route.read) return route.release(path, fh);
}
ws.onmessage = async function(event) {
const req = JSON.parse(event.data);
let response = { op: req.op, error: unix.EIO };
console.time(req.op + ':' + req.path);
try {
if (req.op === 'getattr') {
response = {
op: 'getattr',
st_mode: 0,
st_nlink: 0,
st_size: 0,
...(await getattr(req.path))
};
} else if (req.op === 'open') {
response = {
op: 'open',
fh: await open(req.path)
};
} else if (req.op === 'readdir') {
response = {
op: 'readdir',
entries: [".", "..", ...(await readdir(req.path))]
};
} else if (req.op === 'read') {
const buf = await read(req.path, req.fh, req.size, req.offset)
response = {
op: 'read',
buf,
size: buf.length
};
} else if (req.op === 'release') {
await release(req.path, req.fh);
response = {
op: 'release'
};
}
} catch (e) {
response = {
op: req.op,
error: e instanceof UnixError ? e.error : unix.EIO
}
}
console.timeEnd(req.op + ':' + req.path);
response.id = req.id;
ws.send(JSON.stringify(response));
};
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