working on refactor of fs spec. also Linux port and README stuff.

1 files changed, 179 insertions, 282 deletions

diff --git a/extension/background.js b/extension/background.js
index 75520d9..eb120a7 100644
--- a/extension/background.js
+++ b/extension/background.js
@@ -1,3 +1,5 @@
+const TESTING = (typeof chrome === 'undefined');
+
 const unix = {
   EPERM: 1,
   ENOENT: 2,
@@ -24,26 +26,6 @@ function UnixError(error) {
 }
 UnixError.prototype = Error.prototype;
 
-async function debugTab(tabId) {
-  if (!debugged[tabId]) {
-    await new Promise(resolve => chrome.debugger.attach({tabId}, "1.3", resolve));
-    debugged[tabId] = 0;
-  }
-  debugged[tabId] += 1;
-}
-function sendDebuggerCommand(tabId, method, commandParams) {
-  return new Promise((resolve, reject) =>
-    chrome.debugger.sendCommand({tabId}, method, commandParams, result => {
-      console.log(method, result);
-      if (result) {
-        resolve(result);
-      } else {
-        reject(chrome.runtime.lastError);
-      }
-    })
-  );
-}
-
 // tabs/by-id/ID/title
 // tabs/by-id/ID/url
 // tabs/by-id/ID/console
@@ -63,10 +45,72 @@ function sanitize(s) {
   return s.replace(/[^A-Za-z0-9_\-\.]/gm, '_');
 }
 
-const debugged = {};
+/* if I could specify a custom editor interface for all the routing
+   below ... I would highlight the route names in blocks of some color
+   that sticks out, and let you collapse them. then you could get a
+   view of what the whole filesystem looks like at a glance. */
+const router = {};
+
+async function withTab(handler) {
+  return {
+    async read(path, fh, size, offset) {
+      const tab = await browser.tabs.get(parseInt(pathComponent(path, -2)));
+      return handler(tab);
+    }
+  };
+}
+async function fromScript(code) {
+  return {
+    async read(path, fh, size, offset) {
+      const tabId = parseInt(pathComponent(path, -2));
+      return browser.tabs.executeScript(tabId, {code});
+    }
+  };
+}
+
+router["/tabs/by-id"] = {
+  async entries() {
+    const tabs = await browser.tabs.query({});
+    return tabs.map(tab => String(tab.id));
+  }
+}
+router["/tabs/by-id/*/url"] = withTab(tab => tab.url + "\n");
+router["/tabs/by-id/*/title"] = withTab(tab => tab.title + "\n");
+router["/tabs/by-id/*/text"] = fromScript(`document.body.innerText`);
+router["/tabs/by-id/*/control"] = {
+  async write(path, buf) {
+    const tabId = parseInt(pathComponent(path, -2));
+    if (buf.trim() === 'close') {
+      await new Promise(resolve => chrome.tabs.remove(tabId, resolve));
+    } else {
+      throw new UnixError(unix.EIO);
+    }
+  }
+};
+
+router["/tabs/by-title"] = {
+  async entries() {
+    const tabs = await browser.tabs.query({});
+    return tabs.map(tab => sanitize(String(tab.title).slice(0, 200)) + "_" + String(tab.id));
+  }
+};
+router["/tabs/by-title/*"] = {
+  async getattr(path) {
+    const st_size = (await this.readlink(path)).length + 1;
+    return {
+      st_mode: unix.S_IFLNK | 0444,
+      st_nlink: 1,
+      // You _must_ return correct linkee path length from getattr!
+      st_size
+    };
+  },
+  async readlink(path) {
+    const parts = path.split("_");
+    const id = parts[parts.length - 1];
+    return "../by-id/" + id;
+  }
+};
 
-const router = {
-  "tabs": {
     /* "last-focused": {
      *   // FIXME: symlink to tab by id.
      *   async readlink() {
@@ -74,283 +118,134 @@ const router = {
      *   }
      * },
      */
-    "by-title": {
-      async readdir() {
-        const tabs = await browser.tabs.query({});
-        return tabs.map(tab => sanitize(String(tab.title).slice(0, 200)) + "_" + String(tab.id));
-      },
-      "*": {
-        async getattr(path) {
-          const st_size = (await this.readlink(path)).length + 1;
-          return {
-            st_mode: unix.S_IFLNK | 0444,
-            st_nlink: 1,
-            // You _must_ return correct linkee path length from getattr!
-            st_size
-          };
-        },
-        async readlink(path) {
-          const parts = path.split("_");
-          const id = parts[parts.length - 1];
-          return "../by-id/" + id;
-        }
-      }
-    },
-    "by-id": {
-      async readdir() {
-        const tabs = await browser.tabs.query({});
-        return tabs.map(tab => String(tab.id));
-      },
-
-      "*": {
-        "url": {
-          async read(path, fh, size, offset) {
-            const tab = await browser.tabs.get(parseInt(pathComponent(path, -2)));
-            return (tab.url + "\n").substr(offset, size);
-          }
-        },
-        "title": {
-          async read(path, fh, size, offset) {
-            const tab = await browser.tabs.get(parseInt(pathComponent(path, -2)));
-            return (tab.title + "\n").substr(offset, size);
-          }
-        },
-        "text": {
-          async read(path, fh, size, offset) {
-            const tabId = parseInt(pathComponent(path, -2));
-            const [result] = await browser.tabs.executeScript(tabId, {code: "document.body.innerText"});
-            return result.substr(offset, size)
-          }
-        },
-        "snapshot.mhtml": {
-          async read(path, fh, size, offset) {
-            const tabId = parseInt(pathComponent(path, -2));
-            await debugTab(tabId);
-            await sendDebuggerCommand(tabId, "Page.enable", {});
-
-            const {data} = await sendDebuggerCommand(tabId, "Page.captureSnapshot");
-            return data.substr(offset, size)
-          }
-        },
-        "screenshot.png": {
-          // Broken. Filesystem hangs (? in JS?) and needs to be killed if you read this.
-          async read(path, fh, size, offset) {
-            const tabId = parseInt(pathComponent(path, -2));
-            await debugTab(tabId);
-            await sendDebuggerCommand(tabId, "Page.enable", {});
-
-            const {data} = await sendDebuggerCommand(tabId, "Page.captureScreenshot");
-            const buf = btoa(atob(data).substr(offset, size));
-            return { buf, base64Encoded: true };
-          }
-        },
-        
-        "resources": {
-          async opendir(path) {
-            const tabId = parseInt(pathComponent(path, -2));
-            await debugTab(tabId);
-            return 0;
-          },
-          async readdir(path) {
-            const tabId = parseInt(pathComponent(path, -2));
-            if (!debugged[tabId]) throw new UnixError(unix.EIO);
-
-            const {frameTree} = await sendDebuggerCommand(tabId, "Page.getResourceTree", {});
-            return frameTree.resources.map(r => sanitize(String(r.url).slice(0, 200)));
-          },
-          async releasedir(path) {
-            return 0;
-          },
 
-          "*": {
-            async read(path, fh, size, offset) {
-              const tabId = parseInt(pathComponent(path, -3));
-              const suffix = pathComponent(path, -1);
-
-              if (!debugged[tabId]) throw new UnixError(unix.EIO);
-
-              await sendDebuggerCommand(tabId, "Page.enable", {});
-
-              const {frameTree} = await sendDebuggerCommand(tabId, "Page.getResourceTree", {});
-              for (let resource of frameTree.resources) {
-                const resourceSuffix = sanitize(String(resource.url).slice(0, 200));
-                if (resourceSuffix === suffix) {
-                  let {base64Encoded, content} = await sendDebuggerCommand(tabId, "Page.getResourceContent", {
-                    frameId: frameTree.frame.id,
-                    url: resource.url
-                  });
-                  if (base64Encoded) {
-                    const buf = btoa(atob(content).substr(offset, size));
-                    return { buf, base64Encoded: true };
-                  }
-                  return content.substr(offset, size);
-                }
-              }
-              throw new UnixError(unix.ENOENT);
-            }
-          }
-        },
-
-        "control": {
-          async write(path, buf) {
-            const tabId = parseInt(pathComponent(path, -2));
-            if (buf.trim() === 'close') {
-              await new Promise(resolve => chrome.tabs.remove(tabId, resolve));
-            } else {
-              throw new UnixError(unix.EIO);
-            }
-          }
-        }
-      }
+// ensure that there are entries for all parents
+for (let key in router) {
+  let path = key;
+  while (path !== "/") { // walk upward through the path
+    path = path.substr(0, path.lastIndexOf("/"));
+
+    if (!router[path]) {
+      // find all direct children
+      const children = Object.keys(router)
+                             .filter(k => k.startsWith(path) &&
+                                        (k.match(/\//g) || []).length ===
+                                          (path.match(/\//g) || []).length + 1)
+                             .map(k => k.substr(path.length + 1))
+
+      if (path == '') path = '/';
+      router[path] = {entries() {
+        return children;
+      }}
     }
   }
-};
+}
+if (TESTING) {
+  const assert = require('assert');
+  (async () => {
+    assert.deepEqual(await router['/tabs/by-id/*'].entries(), ['url', 'title', 'text', 'control']);
+    assert.deepEqual(await router['/'].entries(), ['tabs']);
+  })()
+}
 
+console.log(router);
 function findRoute(path) {
-  let route = router;
   let pathSegments = path.split("/");
+  
   if (pathSegments[pathSegments.length - 1].startsWith("._")) {
     throw new UnixError(unix.ENOTSUP); // Apple Double file for xattrs
   }
-  for (let segment of pathSegments) {
-    if (segment === "") continue;
-    route = route[segment] || route["*"];
 
-    if (!route) throw new UnixError(unix.ENOENT);
-  }
-  return route;
-}
+  let routingPath = "";
+  for (let segment of pathSegments) {
+    if (router[routingPath + "/" + segment]) {
+      routingPath += "/" + segment;
+    } else {
+      routingPath += "/*";
+    }
 
-async function getattr(path) {
-  let route = findRoute(path);
-  if (route.getattr) {
-    return route.getattr(path);
-  } else if (route.read || route.write) {
-    // default file attrs
-    return {
-      st_mode: unix.S_IFREG | ((route.read && 0444) || (route.write && 0222)),
-      st_nlink: 1,
-      st_size: 100 // FIXME
-    };
-  } else {
-    // default dir attrs
-    return {
-      st_mode: unix.S_IFDIR | 0755,
-      st_nlink: 3
-    };
+    if (!router[routingPath]) throw new UnixError(unix.ENOENT);
   }
+  return router[routingPath];
 }
 
-async function open(path) {
-  let route = findRoute(path);
-  if (route.open) return route.open(path);
-  else return 0; // empty fh
-}
-
-async function read(path, fh, size, offset) {
-  let route = findRoute(path);
-  if (route.read) return route.read(path, fh, size, offset);
-}
-async function write(path, buf, offset) {
-  let route = findRoute(path);
-  if (route.write) return route.write(path, buf, offset);
-}
-async function release(path, fh) {
-  let route = findRoute(path);
-  if (route.release) return route.release(path, fh);
-}
-
-async function readlink(path) {
-  let route = findRoute(path);
-  if (route.readlink) return route.readlink(path);
-}
-
-async function opendir(path) {
-  let route = findRoute(path);
-  if (route.opendir) return route.opendir(path);
-  else return 0; // empty fh
-}
-async function readdir(path) {
-  let route = findRoute(path);
-  if (route.readdir) return route.readdir(path);
-  return Object.keys(route);
-}
-async function releasedir(path) {
-  let route = findRoute(path);
-  if (route.releasedir) return route.releasedir(path);
-}
-
-function log(...ss) {
-  console.log(...ss);
-}
-
-let port;
-async function onMessage(req) {
-  log('req', req);
-
-  let response = { op: req.op, error: unix.EIO };
-  /* console.time(req.op + ':' + req.path);*/
-  try {
-    if (req.op === 'getattr') {
-      response = {
-        op: 'getattr',
+const ops = {
+  async getattr({path}) {
+    let route = findRoute(path);
+    if (route.getattr) {
+      return {
         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)
+        ...(await route.getattr(path))
       };
-
-    } else if (req.op === 'read') {
-      const ret = await read(req.path, req.fh, req.size, req.offset)
-      const buf = typeof ret === 'string' ? ret : ret.buf;
-      response = {
-        op: 'read',
-        buf
+    } else if (route.read || route.write) {
+      // default file attrs
+      return {
+        st_mode: unix.S_IFREG | ((route.read && 0444) || (route.write && 0222)),
+        st_nlink: 1,
+        st_size: 100 // FIXME
       };
-      if (ret.base64Encoded) response.base64Encoded = ret.base64Encoded;
-
-    } else if (req.op === 'write') {
-      // FIXME: decide whether base64 should be handled here
-      // or in a higher layer?
-      const ret = await write(req.path, atob(req.buf), req.offset)
-      response = {
-        op: 'write'
-      };
-
-    } else if (req.op === 'release') {
-      await release(req.path, req.fh);
-      response = {
-        op: 'release'
-      };
-
-    } else if (req.op === 'readlink') {
-      const buf = await readlink(req.path)
-      response = {
-        op: 'readlink',
-        buf
+    } else {
+      // default dir attrs
+      return {
+        st_mode: unix.S_IFDIR | 0755,
+        st_nlink: 3,
+        st_size: 0
       };
+    }
+  },
+
+  async open({path}) {
+    let route = findRoute(path);
+    if (route.open) return { fh: await route.open(path) };
+    else return { fh: 0 }; // empty fh
+  },
+
+  async read({path, fh, size, offset}) {
+    let route = findRoute(path);
+    if (route.read) return { buf: await route.read(path, fh, size, offset) };
+  },
+  async write({path, buf, offset}) {
+    let route = findRoute(path);
+    if (route.write) return route.write(path, atob(buf), offset);
+  },
+  async release({path, fh}) {
+    let route = findRoute(path);
+    if (route.release) return route.release(path, fh);
+  },
+
+  async readlink({path}) {
+    let route = findRoute(path);
+    if (route.readlink) return { buf: await route.readlink(path) };
+  },
+
+  async opendir({path}) {
+    let route = findRoute(path);
+    if (route.opendir) return { fh: await route.opendir(path) };
+    else return { fh: 0 }; // empty fh
+  },
+  async readdir({path}) {
+    let route = findRoute(path);
+    if (route.readdir) return { entries: await route.readdir(path) };
+    return { entries: [".", "..", ...Object.keys(route)] };
+  },
+  async releasedir({path}) {
+    let route = findRoute(path);
+    if (route.releasedir) return route.releasedir(path);
+  }
+};
 
-    } else if (req.op === 'opendir') {
-      response = {
-        op: 'opendir',
-        fh: await opendir(req.path)
-      };
+let port;
+async function onMessage(req) {
+  console.log('req', req);
 
-    } else if (req.op === 'readdir') {
-      response = {
-        op: 'readdir',
-        entries: [".", "..", ...(await readdir(req.path))]
-      };
+  let response = { op: req.op, error: unix.EIO };
+  /* console.time(req.op + ':' + req.path);*/
+  try {
+    response = await ops[req.op](req);
+    response.op = req.op;
 
-    } else if (req.op === 'releasedir') {
-      await releasedir(req.path, req.fh);
-      response = { op: 'releasedir' };
-    }
   } catch (e) {
     console.error(e);
     response = {
@@ -360,7 +255,7 @@ async function onMessage(req) {
   }
   /* console.timeEnd(req.op + ':' + req.path);*/
 
-  log('resp', response);
+  console.log('resp', response);
   port.postMessage(response);
 };
 
@@ -369,7 +264,7 @@ function tryConnect() {
   /* console.log('hello', port);*/
   /* updateToolbarIcon();*/
   port.onMessage.addListener(onMessage);
-  port.onDisconnect.addListener(p => {log('disconnect', p)});
+  port.onDisconnect.addListener(p => {console.log('disconnect', p)});
 
   /* ws = new WebSocket("ws://localhost:8888");
    * updateToolbarIcon();
@@ -387,7 +282,9 @@ function updateToolbarIcon() {
   }
 }
 
-tryConnect();
-chrome.browserAction.onClicked.addListener(function() {
+if (!TESTING) {
   tryConnect();
-});
+  chrome.browserAction.onClicked.addListener(function() {
+    tryConnect();
+  });
+}