Add napi_fatal_error API #13971

kfarnung · 2017-06-28T21:19:14Z

Checklist

make -j4 test (UNIX), or vcbuild test (Windows) passes
tests and/or benchmarks are included
documentation is changed or added
commit message follows commit guidelines

Affected core subsystem(s)

n-api

kfarnung · 2017-06-28T21:19:47Z

/cc @jasongin @mhdawson

cjihrig · 2017-06-28T21:21:13Z

doc/api/n-api.md

+- `[in] location`: The location at which the error occurred.
+- `[in] message`: The message associated with the error.
+
+Call does not return, the process will be terminated.


Call -> The function call

cjihrig · 2017-06-28T21:28:45Z

src/node_api.cc

@@ -772,6 +772,11 @@ napi_status napi_get_last_error_info(napi_env env,
  return napi_ok;
 }

+NAPI_NO_RETURN void napi_fatal_error(const char* location,
+                                     const char* message) {
+  node::FatalError(location, message);


Doesn't this require node internals?

It does, but since it was already included in the file I assumed it wasn't a big deal. Since this is the v8-specific implementation of N-API, this can still be considered internal (I think).

Sorry, I forgot this hadn't landed. #13892

Ahh, ok, I hadn't seen that. It seems like it would be best then to adapt an implementation into node_api.cc that mimics the node::FatalError behavior?

Yes, that is what I had expected we would need to do.

Based on discussion today in the WG meeting, we'll be reverting back to the original change and removing the duplicated code.

cjihrig · 2017-06-28T21:29:30Z

test/addons-napi/test_fatal/binding.gyp

+  "targets": [
+    {
+      "target_name": "test_fatal",
+      "sources": [ "test_fatal.cc" ]


Any reason not to use just C?

cjihrig · 2017-06-28T21:31:11Z

test/addons-napi/test_fatal/test_fatal.cc

+#include <node_api.h>
+#include "../common.h"
+
+#if defined _WIN32


Do you need windows.h and/or unistd.h?

Nope, I meant to try removing this and forgot.

kfarnung · 2017-06-28T23:36:47Z

src/node_api.cc

+  fflush(stderr);
+  ABORT();
+  // to suppress compiler warning
+  ABORT();


Whoops, I'll clean this up.

kfarnung · 2017-06-29T00:20:18Z

@cjihrig @jasongin I grabbed the relevant portions of the node::FatalError method directly into node_api.cc, but it feels a little dirty to have to copy the PrintErrorString method. I don't see any other instances of print in node_api.cc, so I wasn't sure how else to do it.

kfarnung · 2017-06-29T01:13:19Z

Resolves #13927

jasongin · 2017-06-29T03:45:33Z

test/addons-napi/test_fatal/test.js

+const test_fatal = require(`./build/${common.buildType}/test_fatal`);
+
+// Exception thrown from async completion callback.
+// (Tested in a spawned process because the exception is fatal.)


I recognize these comments, they were copy-pasted from an async callback test I wrote. Please update them. :)

jasongin · 2017-06-29T03:56:25Z

src/node_api.cc

+
+  // Don't include the null character in the output
+  CHECK_GT(n, 0);
+  WriteConsoleW(stderr_handle, wbuf.data(), n - 1, nullptr, nullptr);


Does anyone know the reason for this special case of calling WriteConsoleW() for a windows console? node::Assert() is very similar to node::FatalError(), but it just does a regular fprintf(stderr, ...).

Oh, I think it's required for proper display of UTF-8 encoded error messages? I guess assertion messages are more likely to be limited to plain ASCII. I suppose we do want UTF-8 capability here.

TimothyGu · 2017-06-29T06:09:09Z

doc/api/n-api.md

+```
+
+- `[in] location`: The location at which the error occurred.
+- `[in] message`: The message associated with the error.


Make it clear that location is NULL-able, while message isn't. Speaking of that, I'd actually prefer the function signature to be (message, location) as it seems customary for NULL-able parameters to go last.

Speaking of this, maybe it would be helpful if message can be a printf format string instead? That'd invalidate my comment above but would provide callers more flexibility.

I think it would lead to mistakes when people are migrating code to N-API if the parameter order is different from node::FatalError().

bnoordhuis

Copy/pasting large chunks of code from src/node.cc is not acceptable. See also #13892 (comment).

mhdawson · 2017-06-29T19:23:43Z

Based on discussion today in N-API meeting we are going to look at having a version of the node internals file as part of the wrapper so that we can avoid having to have copies in the core Node.js codebase.

kfarnung · 2017-07-05T20:21:08Z

@bnoordhuis Can you take another look? I've eliminated all of the code duplication in node source files.

CI: https://ci.nodejs.org/job/node-test-pull-request/8996

bnoordhuis

LGTM with a style nit.

bnoordhuis · 2017-07-05T20:44:04Z

test/addons-napi/test_fatal/test.js

+}
+
+const p = child_process.spawnSync(
+  process.execPath, [ '--napi-modules', __filename, 'child' ]);


4 space indent here and below (line continuation.)

bnoordhuis · 2017-07-05T20:51:04Z

test/addons-napi/test_fatal/test_fatal.c

+  };
+
+  NAPI_CALL_RETURN_VOID(env, napi_define_properties(
+    env, exports, sizeof(properties) / sizeof(*properties), properties));


Tangential: macros like NAPI_ASSERT_BASE and NAPI_CALL_BASE should have their bodies wrapped in do { } while (0) in order for them to be safe to use in if/else statements. Right now they can create bugs that will be hard to figure out. Something for another PR.

I opened PR #14095 to fix this.

kfarnung · 2017-07-07T00:00:45Z

FreeBSD rerun: https://ci.nodejs.org/job/node-test-commit-freebsd/10188/

mhdawson

LGTM

kfarnung · 2017-07-07T22:18:09Z

@mhdawson @jasongin I believe this is ready to land whenever someone is ready to do it.

kfarnung · 2017-07-13T18:37:58Z

Rebased and new CI: https://ci.nodejs.org/job/node-test-pull-request/9113/

mhdawson · 2017-07-13T19:28:08Z

Failed in CI on PPCBE is known issue.

mhdawson · 2017-07-13T19:32:49Z

Failure on Alpine is known issue.

mhdawson · 2017-07-13T19:34:28Z

Linux fips issue was a machine issue.

mhdawson · 2017-07-13T22:47:47Z

Ok CI completed, landing.

PR-URL: #13971 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Jason Ginchereau <jasongin@microsoft.com> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>

mhdawson · 2017-07-13T23:07:11Z

landed as 73078d6

PR-URL: #13971 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Jason Ginchereau <jasongin@microsoft.com> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>

PR-URL: nodejs#13971 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Jason Ginchereau <jasongin@microsoft.com> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>

Backport-PR-URL: #19447 PR-URL: #13971 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Jason Ginchereau <jasongin@microsoft.com> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>

nodejs-github-bot added c++ Issues and PRs that require attention from people who are familiar with C++. node-api Issues and PRs related to the Node-API. labels Jun 28, 2017

cjihrig reviewed Jun 28, 2017

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kfarnung force-pushed the fatal_error branch 2 times, most recently from 434945d to 70e0919 Compare June 28, 2017 22:14

kfarnung commented Jun 28, 2017

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src/node_api.cc Outdated

fflush(stderr);

ABORT();

// to suppress compiler warning

ABORT();

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kfarnung Jun 28, 2017

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Whoops, I'll clean this up.

kfarnung force-pushed the fatal_error branch 2 times, most recently from fc27c86 to 44bcf8e Compare June 29, 2017 00:05

jasnell approved these changes Jun 29, 2017

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jasongin approved these changes Jun 29, 2017

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kfarnung force-pushed the fatal_error branch from d15975c to abcf5b2 Compare June 29, 2017 06:05

TimothyGu reviewed Jun 29, 2017

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bnoordhuis requested changes Jun 29, 2017

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bnoordhuis mentioned this pull request Jun 29, 2017

N-API: Remove reference to node internals #13892

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kfarnung force-pushed the fatal_error branch 2 times, most recently from e8ac6ae to bf61c1f Compare June 29, 2017 22:08

kfarnung mentioned this pull request Jun 30, 2017

Add support for Error::Fatal nodejs/node-addon-api#70

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kfarnung force-pushed the fatal_error branch 2 times, most recently from 945c457 to ee3aa34 Compare July 5, 2017 20:18

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cjihrig approved these changes Jul 5, 2017

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kfarnung force-pushed the fatal_error branch 2 times, most recently from 4068780 to 6a32422 Compare July 6, 2017 22:53

mhdawson approved these changes Jul 7, 2017

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n-api: add napi_fatal_error API

9f16c16

kfarnung force-pushed the fatal_error branch from 6a32422 to 9f16c16 Compare July 13, 2017 18:36

mhdawson closed this Jul 13, 2017

kfarnung deleted the fatal_error branch July 13, 2017 23:10

cjihrig mentioned this pull request Jul 14, 2017

N-API: add function for fatal error #13927

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addaleax mentioned this pull request Jul 18, 2017

v8.2.0 proposal #13744

Merged

MylesBorins added the dont-land-on-v6.x label Aug 16, 2017

digitalinfinity mentioned this pull request Aug 31, 2017

Can't use node::FatalError() nodejs/abi-stable-node#232

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MylesBorins mentioned this pull request Apr 16, 2018

v6.14.2 proposal #19996

Merged

Add napi_fatal_error API #13971

Add napi_fatal_error API #13971

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kfarnung commented Jun 28, 2017

Checklist

Affected core subsystem(s)

kfarnung commented Jun 28, 2017

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kfarnung commented Jun 29, 2017

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