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build/node_modules/fqueue/examples/du1.js

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+
+var fs = require('fs'),
+    path = require('path'),
+    FunctionQueue = require('..');
+
+function Diskusage(p, cb, options) {
+  var self = this;
+  
+  var fqueue = new FunctionQueue(options);
+  var dirs = 0;
+  var files = 0;
+  var bytes = 0;
+  
+  function readdir(p) {
+    var args = arguments;
+    
+    fs.readdir(p, function(err, files) {
+      if(err) {
+        fqueue.error(err, readdir, args);
+      } else {
+        files.forEach(function(file) {
+          fqueue.enqueue(stat, [path.join(p, file)]);
+        });
+      }
+      fqueue.done();
+    });
+  }
+  
+  function stat(p) {
+    var args = arguments;
+    
+    fs.stat(p, function(err, s) {
+      if(err) {
+        fqueue.error(err, stat, args);
+      } else {
+        if(s.isDirectory()) {
+          dirs += 1;
+          fqueue.enqueue(readdir, [p]);
+        } else {
+          files += 1;
+          bytes += s.size;
+        }
+      }
+      fqueue.done();
+    });
+  }
+  
+  fqueue.on('error', function(err) {
+    console.log('error:', err);
+  });
+  
+  fqueue.on('retry', function(func, args) {
+    console.log('retry:', args[0]);
+  });
+  
+  fqueue.on('done', function() {
+    cb(bytes, dirs, files, fqueue.errors);
+  });
+  
+  fqueue.start(stat, [p], this);
+}
+
+// Runtime
+
+Diskusage('.', function(bytes, dirs, files, errors) {
+  console.log('');
+  console.log('diskusage: %d bytes in %d dirs and %d files.', bytes, dirs, files);
+  console.log('           %d unreadable paths.', errors);
+});