Initial commit

sys/apis/fs/urlfs.lua

@@ -0,0 +1,78 @@
+local synchronized = require('sync')
+
+local urlfs = { }
+
+function urlfs.mount(dir, url)
+  if not url then
+    error('URL is required')
+  end
+  return {
+    url = url,
+  }
+end
+
+function urlfs.delete(node, dir)
+  fs.unmount(dir)
+end
+
+function urlfs.exists()
+  return true
+end
+
+function urlfs.getSize(node)
+  return node.size or 0
+end
+
+function urlfs.isReadOnly()
+  return true
+end
+
+function urlfs.isDir()
+  return false
+end
+
+function urlfs.getDrive()
+  return 'url'
+end
+
+function urlfs.open(node, fn, fl)
+
+  if fl ~= 'r' then
+    error('Unsupported mode')
+  end
+
+  local c = node.cache
+  if not c then
+    synchronized(node.url, function()
+      c = Util.download(node.url)
+    end)
+    if c and #c > 0 then
+      node.cache = c
+      node.size = #c
+    end
+  end
+
+  if not c or #c == 0 then
+    return
+  end
+
+  local ctr = 0
+  local lines
+  return {
+    readLine = function()
+      if not lines then
+        lines = Util.split(c)
+      end
+      ctr = ctr + 1
+      return lines[ctr]
+    end,
+    readAll = function()
+      return c
+    end,
+    close = function()
+      lines = nil
+    end,
+  }
+end
+
+return urlfs