Implement Deno.kill for windows (#5347)

5 files changed, 104 insertions, 67 deletions

diff --git a/cli/js/lib.deno.unstable.d.ts b/cli/js/lib.deno.unstable.d.ts
index a166cb1c0..d34d86636 100644
--- a/cli/js/lib.deno.unstable.d.ts
+++ b/cli/js/lib.deno.unstable.d.ts
@@ -1120,8 +1120,6 @@ declare namespace Deno {
    *
    *      Deno.kill(p.pid, Deno.Signal.SIGINT);
    *
-   * Throws Error (not yet implemented) on Windows
-   *
    * Requires `allow-run` permission. */
   export function kill(pid: number, signo: number): void;
 
diff --git a/cli/js/ops/process.ts b/cli/js/ops/process.ts
index 4fba4d2de..39c6eb8b7 100644
--- a/cli/js/ops/process.ts
+++ b/cli/js/ops/process.ts
@@ -1,12 +1,8 @@
 // Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 import { sendSync, sendAsync } from "./dispatch_json.ts";
 import { assert } from "../util.ts";
-import { build } from "../build.ts";
 
 export function kill(pid: number, signo: number): void {
-  if (build.os === "windows") {
-    throw new Error("Not yet implemented");
-  }
   sendSync("op_kill", { pid, signo });
 }
 
diff --git a/cli/js/tests/process_test.ts b/cli/js/tests/process_test.ts
index b70ce8307..1ea6f95b7 100644
--- a/cli/js/tests/process_test.ts
+++ b/cli/js/tests/process_test.ts
@@ -5,12 +5,20 @@ import {
   assertStrContains,
   unitTest,
 } from "./test_util.ts";
-const { kill, run, readFile, open, makeTempDir, writeFile } = Deno;
+const {
+  kill,
+  run,
+  readFile,
+  open,
+  makeTempDir,
+  writeFile,
+  writeFileSync,
+} = Deno;
 
 unitTest(function runPermissions(): void {
   let caughtError = false;
   try {
-    Deno.run({ cmd: ["python", "-c", "print('hello world')"] });
+    run({ cmd: ["python", "-c", "print('hello world')"] });
   } catch (e) {
     caughtError = true;
     assert(e instanceof Deno.errors.PermissionDenied);
@@ -99,7 +107,7 @@ while True:
     pass
 `;
 
-    Deno.writeFileSync(`${cwd}/${pyProgramFile}.py`, enc.encode(pyProgram));
+    writeFileSync(`${cwd}/${pyProgramFile}.py`, enc.encode(pyProgram));
     const p = run({
       cwd,
       cmd: ["python", `${pyProgramFile}.py`],
@@ -108,7 +116,7 @@ while True:
     // Write the expected exit code *after* starting python.
     // This is how we verify that `run()` is actually asynchronous.
     const code = 84;
-    Deno.writeFileSync(`${cwd}/${exitCodeFile}`, enc.encode(`${code}`));
+    writeFileSync(`${cwd}/${exitCodeFile}`, enc.encode(`${code}`));
 
     const status = await p.status();
     assertEquals(status.success, false);
@@ -325,60 +333,54 @@ unitTest(function signalNumbers(): void {
   }
 });
 
-// Ignore signal tests on windows for now...
-if (Deno.build.os !== "windows") {
-  unitTest(function killPermissions(): void {
-    let caughtError = false;
-    try {
-      // Unlike the other test cases, we don't have permission to spawn a
-      // subprocess we can safely kill. Instead we send SIGCONT to the current
-      // process - assuming that Deno does not have a special handler set for it
-      // and will just continue even if a signal is erroneously sent.
-      Deno.kill(Deno.pid, Deno.Signal.SIGCONT);
-    } catch (e) {
-      caughtError = true;
-      assert(e instanceof Deno.errors.PermissionDenied);
-    }
-    assert(caughtError);
+unitTest(function killPermissions(): void {
+  let caughtError = false;
+  try {
+    // Unlike the other test cases, we don't have permission to spawn a
+    // subprocess we can safely kill. Instead we send SIGCONT to the current
+    // process - assuming that Deno does not have a special handler set for it
+    // and will just continue even if a signal is erroneously sent.
+    kill(Deno.pid, Deno.Signal.SIGCONT);
+  } catch (e) {
+    caughtError = true;
+    assert(e instanceof Deno.errors.PermissionDenied);
+  }
+  assert(caughtError);
+});
+
+unitTest({ perms: { run: true } }, async function killSuccess(): Promise<void> {
+  const p = run({
+    cmd: ["python", "-c", "from time import sleep; sleep(10000)"],
   });
 
-  unitTest({ perms: { run: true } }, async function killSuccess(): Promise<
-    void
-  > {
-    const p = run({
-      cmd: ["python", "-c", "from time import sleep; sleep(10000)"],
-    });
+  assertEquals(Deno.Signal.SIGINT, 2);
+  kill(p.pid, Deno.Signal.SIGINT);
+  const status = await p.status();
 
-    assertEquals(Deno.Signal.SIGINT, 2);
-    kill(p.pid, Deno.Signal.SIGINT);
-    const status = await p.status();
+  assertEquals(status.success, false);
+  // TODO(ry) On Linux, status.code is sometimes undefined and sometimes 1.
+  // The following assert is causing this test to be flaky. Investigate and
+  // re-enable when it can be made deterministic.
+  // assertEquals(status.code, 1);
+  // assertEquals(status.signal, Deno.Signal.SIGINT);
+  p.close();
+});
 
-    assertEquals(status.success, false);
-    // TODO(ry) On Linux, status.code is sometimes undefined and sometimes 1.
-    // The following assert is causing this test to be flaky. Investigate and
-    // re-enable when it can be made deterministic.
-    // assertEquals(status.code, 1);
-    // assertEquals(status.signal, Deno.Signal.SIGINT);
-    p.close();
+unitTest({ perms: { run: true } }, function killFailed(): void {
+  const p = run({
+    cmd: ["python", "-c", "from time import sleep; sleep(10000)"],
   });
+  assert(!p.stdin);
+  assert(!p.stdout);
 
-  unitTest({ perms: { run: true } }, function killFailed(): void {
-    const p = run({
-      cmd: ["python", "-c", "from time import sleep; sleep(10000)"],
-    });
-    assert(!p.stdin);
-    assert(!p.stdout);
-
-    let err;
-    try {
-      kill(p.pid, 12345);
-    } catch (e) {
-      err = e;
-    }
-
-    assert(!!err);
-    assert(err instanceof TypeError);
+  let err;
+  try {
+    kill(p.pid, 12345);
+  } catch (e) {
+    err = e;
+  }
+  assert(!!err);
+  assert(err instanceof TypeError);
 
-    p.close();
-  });
-}
+  p.close();
+});
diff --git a/cli/signal.rs b/cli/signal.rs
index 6be588b84..f74f9ab26 100644
--- a/cli/signal.rs
+++ b/cli/signal.rs
@@ -1,6 +1,23 @@
 // Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 use crate::op_error::OpError;
 
+#[cfg(not(unix))]
+const SIGINT: i32 = 2;
+#[cfg(not(unix))]
+const SIGKILL: i32 = 9;
+#[cfg(not(unix))]
+const SIGTERM: i32 = 15;
+
+#[cfg(not(unix))]
+use winapi::{
+  shared::minwindef::DWORD,
+  um::{
+    handleapi::CloseHandle,
+    processthreadsapi::{OpenProcess, TerminateProcess},
+    winnt::PROCESS_TERMINATE,
+  },
+};
+
 #[cfg(unix)]
 pub fn kill(pid: i32, signo: i32) -> Result<(), OpError> {
   use nix::sys::signal::{kill as unix_kill, Signal};
@@ -11,7 +28,29 @@ pub fn kill(pid: i32, signo: i32) -> Result<(), OpError> {
 }
 
 #[cfg(not(unix))]
-pub fn kill(_pid: i32, _signal: i32) -> Result<(), OpError> {
-  // TODO: implement this for windows
+pub fn kill(pid: i32, signal: i32) -> Result<(), OpError> {
+  match signal {
+    SIGINT | SIGKILL | SIGTERM => {
+      if pid <= 0 {
+        return Err(OpError::type_error("unsupported pid".to_string()));
+      }
+      unsafe {
+        let handle = OpenProcess(PROCESS_TERMINATE, 0, pid as DWORD);
+        if handle.is_null() {
+          return Err(OpError::from(std::io::Error::last_os_error()));
+        }
+        if TerminateProcess(handle, 1) == 0 {
+          CloseHandle(handle);
+          return Err(OpError::from(std::io::Error::last_os_error()));
+        }
+        if CloseHandle(handle) == 0 {
+          return Err(OpError::from(std::io::Error::last_os_error()));
+        }
+      }
+    }
+    _ => {
+      return Err(OpError::type_error("unsupported signal".to_string()));
+    }
+  }
   Ok(())
 }
diff --git a/std/http/server_test.ts b/std/http/server_test.ts
index 807695c6b..0560f7f8d 100644
--- a/std/http/server_test.ts
+++ b/std/http/server_test.ts
@@ -351,12 +351,15 @@ test("requestBodyReaderWithTransferEncoding", async function (): Promise<void> {
 
 test({
   name: "destroyed connection",
-  // FIXME(bartlomieju): hangs on windows, cause can't do `Deno.kill`
-  ignore: true,
   fn: async (): Promise<void> => {
     // Runs a simple server as another process
     const p = Deno.run({
-      cmd: [Deno.execPath(), "--allow-net", "http/testdata/simple_server.ts"],
+      cmd: [
+        Deno.execPath(),
+        "run",
+        "--allow-net",
+        "http/testdata/simple_server.ts",
+      ],
       stdout: "piped",
     });
 
@@ -392,13 +395,12 @@ test({
 
 test({
   name: "serveTLS",
-  // FIXME(bartlomieju): hangs on windows, cause can't do `Deno.kill`
-  ignore: true,
   fn: async (): Promise<void> => {
     // Runs a simple server as another process
     const p = Deno.run({
       cmd: [
         Deno.execPath(),
+        "run",
         "--allow-net",
         "--allow-read",
         "http/testdata/simple_https_server.ts",