Public release release-be1f654ae8de

Source commit: be1f654ae8de7d5eeb2005b4e1a05bf1ebf3124f

Public tree identity: sha256:ab53679496be4be7d1e02bc00723072774d1a3f87e10cc56558a752f28f6abb1

scripts/dap-client.js

@@ -0,0 +1,132 @@
+const cp = require("child_process");
+
+class DapClient {
+  constructor({
+    cwd = process.cwd(),
+    env = process.env,
+    command = "cargo",
+    args = [
+      "run",
+      "-q",
+      "-p",
+      "clusterflux-dap",
+      "--bin",
+      "clusterflux-debug-dap",
+    ],
+  } = {}) {
+    this.child = cp.spawn(
+      command,
+      args,
+      { cwd, env }
+    );
+    this.seq = 1;
+    this.buffer = Buffer.alloc(0);
+    this.messages = [];
+    this.waiters = [];
+    this.stderr = "";
+
+    this.child.stdout.on("data", (chunk) => {
+      this.buffer = Buffer.concat([this.buffer, chunk]);
+      this.parse();
+    });
+    this.child.stderr.on("data", (chunk) => {
+      this.stderr += chunk.toString();
+    });
+    this.child.on("exit", () => this.flushWaiters());
+  }
+
+  send(command, args = {}) {
+    const seq = this.seq++;
+    const message = { seq, type: "request", command, arguments: args };
+    const payload = Buffer.from(JSON.stringify(message));
+    this.child.stdin.write(`Content-Length: ${payload.length}\r\n\r\n`);
+    this.child.stdin.write(payload);
+    return seq;
+  }
+
+  async response(seq, command) {
+    const message = await this.waitFor(
+      (item) =>
+        item.type === "response" &&
+        item.request_seq === seq &&
+        item.command === command
+    );
+    if (!message.success) {
+      throw new Error(
+        `DAP ${command} failed: ${message.message || JSON.stringify(message)}\nAdapter stderr:\n${this.stderr}`
+      );
+    }
+    return message;
+  }
+
+  async failure(seq, command) {
+    const message = await this.waitFor(
+      (item) =>
+        item.type === "response" &&
+        item.request_seq === seq &&
+        item.command === command
+    );
+    if (message.success) {
+      throw new Error(`DAP ${command} unexpectedly succeeded`);
+    }
+    return message;
+  }
+
+  waitFor(predicate, timeoutMs = 120000) {
+    const existing = this.messages.find(predicate);
+    if (existing) return Promise.resolve(existing);
+
+    return new Promise((resolve, reject) => {
+      const timer = setTimeout(() => {
+        this.child.kill("SIGKILL");
+        const recent = this.messages
+          .slice(-10)
+          .map((message) => JSON.stringify(message))
+          .join("\n");
+        reject(
+          new Error(
+            `timed out waiting for DAP message\nRecent DAP messages:\n${recent}\nAdapter stderr:\n${this.stderr}`
+          )
+        );
+      }, timeoutMs);
+      this.waiters.push({ predicate, resolve, timer });
+    });
+  }
+
+  parse() {
+    while (true) {
+      const headerEnd = this.buffer.indexOf("\r\n\r\n");
+      if (headerEnd < 0) return;
+      const header = this.buffer.slice(0, headerEnd).toString();
+      const match = header.match(/Content-Length: (\d+)/i);
+      if (!match) throw new Error(`bad DAP header: ${header}`);
+      const length = Number(match[1]);
+      const start = headerEnd + 4;
+      const end = start + length;
+      if (this.buffer.length < end) return;
+      const payload = this.buffer.slice(start, end).toString();
+      this.buffer = this.buffer.slice(end);
+      this.messages.push(JSON.parse(payload));
+      this.flushWaiters();
+    }
+  }
+
+  flushWaiters() {
+    for (const waiter of [...this.waiters]) {
+      const message = this.messages.find(waiter.predicate);
+      if (!message) continue;
+      clearTimeout(waiter.timer);
+      this.waiters.splice(this.waiters.indexOf(waiter), 1);
+      waiter.resolve(message);
+    }
+  }
+
+  async close() {
+    if (this.child.exitCode !== null) return;
+    const seq = this.send("disconnect");
+    await this.response(seq, "disconnect");
+    this.child.stdin.end();
+  }
+}
+
+module.exports = { DapClient };