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node_modules/generic-pool/lib/ResourceRequest.js

@@ -0,0 +1,76 @@
+"use strict";
+
+const Deferred = require("./Deferred");
+const errors = require("./errors");
+
+function fbind(fn, ctx) {
+  return function bound() {
+    return fn.apply(ctx, arguments);
+  };
+}
+
+/**
+ * Wraps a users request for a resource
+ * Basically a promise mashed in with a timeout
+ * @private
+ */
+class ResourceRequest extends Deferred {
+  /**
+   * [constructor description]
+   * @param  {Number} ttl     timeout
+   */
+  constructor(ttl, Promise) {
+    super(Promise);
+    this._creationTimestamp = Date.now();
+    this._timeout = null;
+
+    if (ttl !== undefined) {
+      this.setTimeout(ttl);
+    }
+  }
+
+  setTimeout(delay) {
+    if (this._state !== ResourceRequest.PENDING) {
+      return;
+    }
+    const ttl = parseInt(delay, 10);
+
+    if (isNaN(ttl) || ttl <= 0) {
+      throw new Error("delay must be a positive int");
+    }
+
+    const age = Date.now() - this._creationTimestamp;
+
+    if (this._timeout) {
+      this.removeTimeout();
+    }
+
+    this._timeout = setTimeout(
+      fbind(this._fireTimeout, this),
+      Math.max(ttl - age, 0)
+    );
+  }
+
+  removeTimeout() {
+    if (this._timeout) {
+      clearTimeout(this._timeout);
+    }
+    this._timeout = null;
+  }
+
+  _fireTimeout() {
+    this.reject(new errors.TimeoutError("ResourceRequest timed out"));
+  }
+
+  reject(reason) {
+    this.removeTimeout();
+    super.reject(reason);
+  }
+
+  resolve(value) {
+    this.removeTimeout();
+    super.resolve(value);
+  }
+}
+
+module.exports = ResourceRequest;