initial

autosave.mjs

@@ -0,0 +1,126 @@
+throw new Error('Not implemented');
+
+//TODO - this sketch is messy and incomplete
+
+class Autosaver {
+
+	#autosave_timer = null
+	#buffer_file_stream = null
+
+	constructor(line_buffer=[], buffer_file=null, autosave=false, autosave_interval=600) {
+		Object.assign({ line_buffer, buffer_file, autosave, autosave_interval });
+		this.apply_configuration(true);
+	}
+
+
+	perform_autosave() {
+		// TODO: flush pending lines to buffer_file
+		if (this.autosave) {
+			console.log("Autosave not implemented")
+		}
+	}
+
+	constructor(line_buffer=[], buffer_file=null, autosave=false, autosave_interval=600) {
+		Object.assign({ line_buffer, buffer_file, autosave, autosave_interval });
+		this.apply_configuration(true);
+	}
+
+	#get_buffer_writer() {
+
+		//TODO: This function should be properly vetted (ChatGPT 5.2)
+
+		if (!this.buffer_file) {
+			return null;
+		}
+
+		if (!this.#buffer_file_stream) {
+			try {
+				this.#buffer_file_stream = fs.createWriteStream(this.buffer_file, {
+					flags: 'a',
+					encoding: 'latin1'
+				});
+
+				this.#buffer_file_stream.on('error', (err) => {
+					console.log("Buffer stream error:", err);
+
+					try {
+						this.#buffer_file_stream.destroy();
+					} catch (destroy_err) {
+						console.log("Failed to destroy buffer stream due to", destroy_err);
+					}
+
+					this.#buffer_file_stream = null;
+				});
+			} catch (err) {
+				console.log("Failed to open buffer file due to", err);
+				this.#buffer_file_stream = null;
+				return null;
+			}
+		}
+
+		const stream = this.#buffer_file_stream;
+
+		const write_line = (line) => {
+
+			if (!stream.writable) {
+				this.#buffer_file_stream = null;
+				return;
+			}
+
+			stream.write(line + '\n');
+
+		};
+
+		return write_line;
+	}
+
+
+	#maybe_read_previous_buffer_file() {
+		if (this.buffer_file) {
+			let content;
+			try {
+				content = fs.readFileSync(this.buffer_file, { encoding: 'latin1' });
+			} catch (err) {
+				console.log("Failed to read buffer file due to", err);
+			}
+
+			if (content !== undefined) {
+				const lines = content.split('\n');
+				for (const line of lines) {
+					this.log_line(line);
+				}
+			}
+		}
+	}
+
+	#configure_autosave_timer() {
+		if (this.#autosave_timer) {
+			clearInterval(this.#autosave_timer);
+			this.#autosave_timer = null;
+		}
+
+		if (this.autosave && this.autosave_interval > 0) {
+			this.#autosave_timer = setInterval(() => {
+				this.perform_autosave();
+			}, this.autosave_interval * 1000);
+		}
+	}
+
+	apply_configuration(starting = false) {
+
+		if (starting === true) {
+			this.#maybe_read_previous_buffer_file();
+		}
+
+		this.#configure_autosave_timer();
+
+	}
+
+
+	buffer_line(line) {
+		const write_line = this.#get_buffer_writer();
+		write_line?.(line);
+	}
+
+
+}