hono
Version:
Web framework built on Web Standards
87 lines (86 loc) • 2.89 kB
JavaScript
;
var __defProp = Object.defineProperty;
var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
var __getOwnPropNames = Object.getOwnPropertyNames;
var __hasOwnProp = Object.prototype.hasOwnProperty;
var __export = (target, all) => {
for (var name in all)
__defProp(target, name, { get: all[name], enumerable: true });
};
var __copyProps = (to, from, except, desc) => {
if (from && typeof from === "object" || typeof from === "function") {
for (let key of __getOwnPropNames(from))
if (!__hasOwnProp.call(to, key) && key !== except)
__defProp(to, key, { get: () => from[key], enumerable: !(desc = __getOwnPropDesc(from, key)) || desc.enumerable });
}
return to;
};
var __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: true }), mod);
var sse_exports = {};
__export(sse_exports, {
SSEStreamingApi: () => SSEStreamingApi,
streamSSE: () => streamSSE
});
module.exports = __toCommonJS(sse_exports);
var import_html = require("../../utils/html");
var import_stream = require("../../utils/stream");
var import_utils = require("./utils");
class SSEStreamingApi extends import_stream.StreamingApi {
constructor(writable, readable) {
super(writable, readable);
}
async writeSSE(message) {
const data = await (0, import_html.resolveCallback)(message.data, import_html.HtmlEscapedCallbackPhase.Stringify, false, {});
const dataLines = data.split("\n").map((line) => {
return `data: ${line}`;
}).join("\n");
const sseData = [
message.event && `event: ${message.event}`,
dataLines,
message.id && `id: ${message.id}`,
message.retry && `retry: ${message.retry}`
].filter(Boolean).join("\n") + "\n\n";
await this.write(sseData);
}
}
const run = async (stream, cb, onError) => {
try {
await cb(stream);
} catch (e) {
if (e instanceof Error && onError) {
await onError(e, stream);
await stream.writeSSE({
event: "error",
data: e.message
});
} else {
console.error(e);
}
} finally {
stream.close();
}
};
const contextStash = /* @__PURE__ */ new WeakMap();
const streamSSE = (c, cb, onError) => {
const { readable, writable } = new TransformStream();
const stream = new SSEStreamingApi(writable, readable);
if ((0, import_utils.isOldBunVersion)()) {
c.req.raw.signal.addEventListener("abort", () => {
if (!stream.closed) {
stream.abort();
}
});
}
contextStash.set(stream.responseReadable, c);
c.header("Transfer-Encoding", "chunked");
c.header("Content-Type", "text/event-stream");
c.header("Cache-Control", "no-cache");
c.header("Connection", "keep-alive");
run(stream, cb, onError);
return c.newResponse(stream.responseReadable);
};
// Annotate the CommonJS export names for ESM import in node:
0 && (module.exports = {
SSEStreamingApi,
streamSSE
});