Add logging with filters

src/components/Logging/Logging.tsx

@@ -0,0 +1,129 @@
+import {useEffect, useRef, useState} from "react";
+import {create} from "zustand";
+
+import formatDuration from "../../utils/formatDuration.ts";
+import {type LogFilterPredicate, type LogRecord, useLogs} from "./useLogs.ts";
+import Filters from "./Filters.tsx";
+import {type Cell, useCell} from "../../utils/cellStore.ts";
+
+import styles from "./Logging.module.css";
+
+type LoggingSettings = {
+  showRelativeTime: boolean;
+  setShowRelativeTime: (showRelativeTime: boolean) => void;
+  scrollToBottom: boolean;
+  setScrollToBottom: (scrollToBottom: boolean) => void;
+};
+
+const useLoggingSettings = create<LoggingSettings>((set) => ({
+  showRelativeTime: false,
+  setShowRelativeTime: (showRelativeTime: boolean) => set({ showRelativeTime }),
+  scrollToBottom: true,
+  setScrollToBottom: (scrollToBottom: boolean) => set({ scrollToBottom }),
+}));
+
+function LogMessage({
+  recordCell,
+  onUpdate,
+}: {
+  recordCell: Cell<LogRecord>,
+  onUpdate?: () => void,
+}) {
+  const { showRelativeTime, setShowRelativeTime } = useLoggingSettings();
+  const record = useCell(recordCell);
+
+  /**
+   * Normalizes the log level number to a multiple of 10, for which there are CSS styles.
+   */
+  const normalizedLevelNo = (() => {
+    // By default, the highest level is 50 (CRITICAL). Custom levels can be higher, but we don't have more critical color.
+    if (record.levelno >= 50) return 50;
+
+    return Math.round(record.levelno / 10) * 10;
+  })();
+
+  const normalizedName = record.name.split(".").pop() || record.name;
+
+  useEffect(() => {
+    if (onUpdate) onUpdate();
+  }, [record, onUpdate]);
+
+  return <div className={`${styles.logContainer} round-md border-lg flex-row gap-md`}>
+    <div className={`${styles[`accented${normalizedLevelNo}`]} flex-col padding-sm justify-between`}>
+      <span className={"mono bold"}>{record.levelname}</span>
+      <span className={"mono clickable font-small"}
+        onClick={() => setShowRelativeTime(!showRelativeTime)}
+      >{showRelativeTime
+        ? formatDuration(record.relativeCreated)
+        : new Date(record.created * 1000).toLocaleTimeString()
+      }</span>
+    </div>
+    <div className={"flex-col flex-1 padding-sm"}>
+      <span className={"mono"}>{normalizedName}</span>
+      <span>{record.message}</span>
+    </div>
+  </div>;
+}
+
+function LogMessages({ recordCells }: { recordCells: Cell<LogRecord>[] }) {
+  const scrollableRef = useRef<HTMLDivElement>(null);
+  const lastElementRef = useRef<HTMLLIElement>(null)
+  const { scrollToBottom, setScrollToBottom } = useLoggingSettings();
+
+  useEffect(() => {
+    if (!scrollableRef.current) return;
+    const currentScrollableRef = scrollableRef.current;
+
+    const handleScroll = () => setScrollToBottom(false);
+
+    currentScrollableRef.addEventListener("wheel", handleScroll);
+    currentScrollableRef.addEventListener("touchmove", handleScroll);
+
+    return () => {
+      currentScrollableRef.removeEventListener("wheel", handleScroll);
+      currentScrollableRef.removeEventListener("touchmove", handleScroll);
+    }
+  }, [scrollableRef, setScrollToBottom]);
+
+  function scrollLastElementIntoView(force = false) {
+    if ((!scrollToBottom && !force) || !lastElementRef.current) return;
+    lastElementRef.current.scrollIntoView({ behavior: "smooth" });
+  }
+
+  return <div ref={scrollableRef} className={"min-height-0 scroll-y padding-b-md"}>
+    <ol className={`${styles.noNumbers} margin-0 flex-col gap-md`}>
+      {recordCells.map((recordCell, i) => (
+        <li key={`${i}_${recordCell.get().firstRelativeCreated}`}>
+          <LogMessage recordCell={recordCell} onUpdate={scrollLastElementIntoView} />
+        </li>
+      ))}
+      <li ref={lastElementRef}></li>
+    </ol>
+    {!scrollToBottom && <button
+      className={styles.floatingButton}
+      onClick={() => {
+        setScrollToBottom(true);
+        scrollLastElementIntoView(true);
+      }}
+    >
+      Scroll to bottom
+    </button>}
+  </div>;
+}
+
+export default function Logging() {
+  const [filterPredicates, setFilterPredicates] = useState(new Map<string, LogFilterPredicate>());
+  const { filteredLogs, distinctNames } = useLogs(filterPredicates)
+
+  return <div className={`flex-col gap-lg min-height-0 ${styles.loggingContainer}`}>
+    <div className={"flex-row gap-lg justify-between align-center"}>
+      <h2 className={"margin-0"}>Logs</h2>
+      <Filters
+        filterPredicates={filterPredicates}
+        setFilterPredicates={setFilterPredicates}
+        agentNames={distinctNames}
+      />
+    </div>
+    <LogMessages recordCells={filteredLogs} />
+  </div>;
+}