feat: 초기 프로젝트 설정 및 룰.md 파일 추가

api.hyungi.net/node_modules/culvert/channel.js

@@ -0,0 +1,67 @@
+"use strict";
+
+module.exports = makeChannel;
+
+function makeChannel(bufferSize, monitor) {
+  bufferSize = bufferSize|0;
+  var dataQueue = [];
+  var readQueue = [];
+  var drainList = [];
+
+  if (typeof monitor === "string") {
+    monitor = log(monitor);
+  }
+
+  return {
+    drain: drain,
+    put: put,
+    take: take,
+  };
+
+  function drain(callback) {
+    if (typeof callback !== "function") {
+      throw new TypeError("callback must be function");
+    }
+    if (dataQueue.length <= bufferSize) return callback();
+    drainList.push(callback);
+  }
+
+  // Returns true when it's safe to continue without draining
+  function put(item) {
+    if (monitor) monitor("put", item);
+    if (readQueue.length) {
+      if (monitor) monitor("take", item);
+      readQueue.shift()(null, item);
+    }
+    else {
+      dataQueue.push(item);
+    }
+    return dataQueue.length <= bufferSize;
+  }
+
+  function take(callback) {
+    if (typeof callback !== "function") {
+      throw new TypeError("callback must be function");
+    }
+    if (dataQueue.length) {
+      var item = dataQueue.shift();
+      if (monitor) monitor("take", item);
+      callback(null, item);
+      if (dataQueue.length <= bufferSize && drainList.length) {
+        var list = drainList;
+        drainList = [];
+        for (var i = 0; i < list.length; i++) {
+          list[i]();
+        }
+      }
+      return;
+    }
+    readQueue.push(callback);
+  }
+}
+
+function log(name) {
+  return function (type, value) {
+    console.info(name, type, value);
+  };
+}