Make logs view performant

frontend/obsidian-plugin/src/vault-link-plugin.ts

@@ -66,7 +66,7 @@ export default class VaultLinkPlugin extends Plugin {
 		);
 		this.registerView(
 			LogsView.TYPE,
-			(leaf) => new LogsView(this, this.client, leaf)
+			(leaf) => new LogsView(this.client, leaf)
 		);
 
 		this.addRibbonIcon(

frontend/obsidian-plugin/src/views/logs-view.ts

@@ -1,14 +1,15 @@
 import type { WorkspaceLeaf } from "obsidian";
 import { ItemView } from "obsidian";
-import type VaultLinkPlugin from "../vault-link-plugin";
-import { LogLevel, type SyncClient } from "sync-client";
+import { LogLevel, LogLine, type SyncClient } from "sync-client";
 
 export class LogsView extends ItemView {
 	public static readonly TYPE = "logs-view";
 	public static readonly ICON = "logs";
 
+	private logsContainer: HTMLElement | undefined;
+	private logLineToElement: Map<LogLine, HTMLElement> = new Map();
+
 	public constructor(
-		private readonly plugin: VaultLinkPlugin,
 		private readonly client: SyncClient,
 		leaf: WorkspaceLeaf
 	) {
@@ -36,76 +37,58 @@ export class LogsView extends ItemView {
 
 		const container = this.containerEl.children[1];
 		container.addClass("logs-view");
+		container.createEl("h4", { text: "VaultLink logs" });
+		this.logsContainer = container.createDiv({ cls: "logs-container" });
 	}
 
 	private updateView(): void {
-		const container = this.containerEl.children[1];
-
-		let logsContainer = container
-			.getElementsByClassName("logs-container")
-			.item(0);
-		const scrollPosition = logsContainer?.scrollTop;
-
-		container.empty();
-
-		container.createEl("h4", { text: "VaultLink logs" });
-		container.createEl(
-			"p",
-			{
-				text: "This view displays logs generated by VaultLink. You can set the log level in the "
-			},
-			(p) => {
-				p.createEl(
-					"a",
-					{
-						text: "settings"
-					},
-					(button) => {
-						button.addEventListener("click", () => {
-							this.plugin.openSettings();
-						});
-					}
-				);
-
-				p.createSpan({ text: "." });
-			}
-		);
-
-		const logs = this.client.logger.getMessages(LogLevel.DEBUG);
-
-		if (logs.length === 0) {
-			container.createEl("p", { text: "No logs available yet." });
+		const container = this.logsContainer;
+		if (container === undefined) {
 			return;
 		}
 
-		logsContainer = container.createDiv(
-			{ cls: "logs-container" },
-			(element) => {
-				logs.forEach((message) =>
-					element.createDiv(
-						{
-							cls: ["log-message", message.level]
-						},
-						(messageContainer) => {
-							messageContainer.createEl("span", {
-								text: LogsView.formatTimestamp(
-									message.timestamp
-								),
-								cls: "timestamp"
-							});
-							messageContainer.createEl("span", {
-								text: message.message
-							});
-						}
-					)
-				);
-			}
-		);
+		const logs = this.client.logger.getMessages(LogLevel.DEBUG);
 
-		if (scrollPosition !== undefined) {
-			logsContainer.scrollTop = scrollPosition;
-		} else {
-			logsContainer.scrollTop = logsContainer.scrollHeight;
+		if (this.logLineToElement.size === 0 && logs.length > 0) {
+			// Clear the "No logs available yet" message
+			container.empty();
+		}
+
+		logs.forEach((message) => {
+			if (this.logLineToElement.has(message)) {
+				return;
+			}
+
+			const element = container.createDiv(
+				{
+					cls: ["log-message", message.level]
+				},
+				(messageContainer) => {
+					messageContainer.createEl("span", {
+						text: LogsView.formatTimestamp(message.timestamp),
+						cls: "timestamp"
+					});
+					messageContainer.createEl("span", {
+						text: message.message
+					});
+				}
+			);
+
+			this.logLineToElement.set(message, element);
+		});
+
+		const newLines = new Set(logs);
+		for (const [logLine, element] of this.logLineToElement) {
+			if (!newLines.has(logLine)) {
+				element.remove();
+				this.logLineToElement.delete(logLine);
+			}
+		}
+
+		if (logs.length === 0) {
+			container.createEl("p", {
+				text: "No logs available yet."
+			});
 		}
 	}
 }

frontend/sync-client/src/tracing/logger.ts

@@ -21,7 +21,7 @@ export class LogLine {
 }
 
 export class Logger {
-	private static readonly MAX_MESSAGES = 10000;
+	private static readonly MAX_MESSAGES = 2000;
 	private readonly messages: LogLine[] = [];
 	private readonly onMessageListeners: ((message: LogLine) => void)[] = [];