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node_modules/basic-ftp/dist/ProgressTracker.js

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+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.ProgressTracker = void 0;
+/**
+ * Tracks progress of one socket data transfer at a time.
+ */
+class ProgressTracker {
+    constructor() {
+        this.bytesOverall = 0;
+        this.intervalMs = 500;
+        this.onStop = noop;
+        this.onHandle = noop;
+    }
+    /**
+     * Register a new handler for progress info. Use `undefined` to disable reporting.
+     */
+    reportTo(onHandle = noop) {
+        this.onHandle = onHandle;
+    }
+    /**
+     * Start tracking transfer progress of a socket.
+     *
+     * @param socket  The socket to observe.
+     * @param name  A name associated with this progress tracking, e.g. a filename.
+     * @param type  The type of the transfer, typically "upload" or "download".
+     */
+    start(socket, name, type) {
+        let lastBytes = 0;
+        this.onStop = poll(this.intervalMs, () => {
+            const bytes = socket.bytesRead + socket.bytesWritten;
+            this.bytesOverall += bytes - lastBytes;
+            lastBytes = bytes;
+            this.onHandle({
+                name,
+                type,
+                bytes,
+                bytesOverall: this.bytesOverall
+            });
+        });
+    }
+    /**
+     * Stop tracking transfer progress.
+     */
+    stop() {
+        this.onStop(false);
+    }
+    /**
+     * Call the progress handler one more time, then stop tracking.
+     */
+    updateAndStop() {
+        this.onStop(true);
+    }
+}
+exports.ProgressTracker = ProgressTracker;
+/**
+ * Starts calling a callback function at a regular interval. The first call will go out
+ * immediately. The function returns a function to stop the polling.
+ */
+function poll(intervalMs, updateFunc) {
+    const id = setInterval(updateFunc, intervalMs);
+    const stopFunc = (stopWithUpdate) => {
+        clearInterval(id);
+        if (stopWithUpdate) {
+            updateFunc();
+        }
+        // Prevent repeated calls to stop calling handler.
+        updateFunc = noop;
+    };
+    updateFunc();
+    return stopFunc;
+}
+function noop() { }