waveterm/frontend/app/view/term.tsx

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// Copyright 2024, Command Line Inc.
// SPDX-License-Identifier: Apache-2.0
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import { BlockService } from "@/bindings/blockservice";
import { getBlockSubject } from "@/store/global";
import { base64ToArray } from "@/util/util";
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import { FitAddon } from "@xterm/addon-fit";
import type { ITheme } from "@xterm/xterm";
import { Terminal } from "@xterm/xterm";
import * as React from "react";
import "./view.less";
import "/public/xterm.css";
function getThemeFromCSSVars(el: Element): ITheme {
const theme: ITheme = {};
const elemStyle = getComputedStyle(el);
theme.foreground = elemStyle.getPropertyValue("--term-foreground");
theme.background = elemStyle.getPropertyValue("--term-background");
theme.black = elemStyle.getPropertyValue("--term-black");
theme.red = elemStyle.getPropertyValue("--term-red");
theme.green = elemStyle.getPropertyValue("--term-green");
theme.yellow = elemStyle.getPropertyValue("--term-yellow");
theme.blue = elemStyle.getPropertyValue("--term-blue");
theme.magenta = elemStyle.getPropertyValue("--term-magenta");
theme.cyan = elemStyle.getPropertyValue("--term-cyan");
theme.white = elemStyle.getPropertyValue("--term-white");
theme.brightBlack = elemStyle.getPropertyValue("--term-bright-black");
theme.brightRed = elemStyle.getPropertyValue("--term-bright-red");
theme.brightGreen = elemStyle.getPropertyValue("--term-bright-green");
theme.brightYellow = elemStyle.getPropertyValue("--term-bright-yellow");
theme.brightBlue = elemStyle.getPropertyValue("--term-bright-blue");
theme.brightMagenta = elemStyle.getPropertyValue("--term-bright-magenta");
theme.brightCyan = elemStyle.getPropertyValue("--term-bright-cyan");
theme.brightWhite = elemStyle.getPropertyValue("--term-bright-white");
theme.selectionBackground = elemStyle.getPropertyValue("--term-selection-background");
theme.selectionInactiveBackground = elemStyle.getPropertyValue("--term-selection-background");
theme.cursor = elemStyle.getPropertyValue("--term-selection-background");
theme.cursorAccent = elemStyle.getPropertyValue("--term-cursor-accent");
return theme;
}
type InitialLoadDataType = {
loaded: boolean;
heldData: Uint8Array[];
};
const TerminalView = ({ blockId }: { blockId: string }) => {
const connectElemRef = React.useRef<HTMLDivElement>(null);
const termRef = React.useRef<Terminal>(null);
const initialLoadRef = React.useRef<InitialLoadDataType>({ loaded: false, heldData: [] });
React.useEffect(() => {
if (!connectElemRef.current) {
return;
}
console.log("terminal created");
const term = new Terminal({
theme: getThemeFromCSSVars(connectElemRef.current),
fontSize: 12,
fontFamily: "Hack",
drawBoldTextInBrightColors: false,
fontWeight: "normal",
fontWeightBold: "bold",
});
termRef.current = term;
const fitAddon = new FitAddon();
term.loadAddon(fitAddon);
term.open(connectElemRef.current);
fitAddon.fit();
BlockService.SendCommand(blockId, {
command: "controller:input",
termsize: { rows: term.rows, cols: term.cols },
});
term.onData((data) => {
const b64data = btoa(data);
const inputCmd = { command: "controller:input", blockid: blockId, inputdata64: b64data };
BlockService.SendCommand(blockId, inputCmd);
});
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// resize observer
const rszObs = new ResizeObserver(() => {
const oldRows = term.rows;
const oldCols = term.cols;
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fitAddon.fit();
if (oldRows !== term.rows || oldCols !== term.cols) {
BlockService.SendCommand(blockId, {
command: "controller:input",
termsize: { rows: term.rows, cols: term.cols },
});
}
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});
rszObs.observe(connectElemRef.current);
// block subject
const blockSubject = getBlockSubject(blockId);
blockSubject.subscribe((data) => {
// base64 decode
const decodedData = base64ToArray(data.ptydata);
if (initialLoadRef.current.loaded) {
term.write(decodedData);
} else {
initialLoadRef.current.heldData.push(decodedData);
}
});
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return () => {
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term.dispose();
rszObs.disconnect();
blockSubject.release();
};
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}, [connectElemRef.current]);
React.useEffect(() => {
if (!termRef.current) {
return;
}
// load data from filestore
const startTs = Date.now();
let loadedBytes = 0;
const localTerm = termRef.current; // avoids devmode double effect running issue (terminal gets created twice)
const usp = new URLSearchParams();
usp.set("zoneid", blockId);
usp.set("name", "main");
fetch("/wave/file?" + usp.toString())
.then((resp) => {
if (resp.ok) {
return resp.arrayBuffer();
}
console.log("error loading file", resp.status, resp.statusText);
})
.then((data: ArrayBuffer) => {
const uint8View = new Uint8Array(data);
localTerm.write(uint8View);
loadedBytes = uint8View.byteLength;
})
.finally(() => {
initialLoadRef.current.heldData.forEach((data) => {
localTerm.write(data);
});
initialLoadRef.current.loaded = true;
initialLoadRef.current.heldData = [];
console.log(`terminal loaded file ${loadedBytes} bytes, ${Date.now() - startTs}ms`);
});
}, [termRef.current]);
return (
<div className="view-term">
<div key="conntectElem" className="term-connectelem" ref={connectElemRef}></div>
</div>
);
};
export { TerminalView };