tools: add update-llhttp.sh

PR-URL: #44652
Reviewed-By: Michael Dawson <midawson@redhat.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Co-authored-by: Antoine du Hamel <duhamelantoine1995@gmail.com>
Co-authored-by: Tobias Nießen <tniessen@tnie.de>
Co-authored-by: Luigi Pinca <luigipinca@gmail.com>

doc/contributing/maintaining-http.md

@@ -78,32 +78,32 @@ are maintained in the [llhttp](https://github.com/nodejs/llhttp)
 repository. Updates are pulled into Node.js under
 [deps/llhttp](https://github.com/nodejs/node/tree/HEAD/deps/llhttp).
 
-In order to update Node.js with a new version of llhttp:
-
-* check out the tagged release that you want to update to (a release
-  should be created in the llhttp repo before updating Node.js).
-* run `npm install` in the directory that you checked out llhttp.
-* run `make release` in the directory that you checked out llhttp.
-* copy the contents of the `release` directory from the directory you
-  checked llhttp out to
-  [deps/llhttp](https://github.com/nodejs/node/tree/HEAD/deps/llhttp)
-
-It should look like the following:
-
-```console
-├── CMakeLists.txt
-├── common.gypi
-├── include
-│   └── llhttp.h
-├── LICENSE-MIT
-├── llhttp.gyp
-├── README.md
-└── src
-    ├── api.c
-    ├── http.c
-    └── llhttp.c
+In order to update Node.js with a new version of llhttp you can use the
+`tools/update-llhttp.sh` script.
+
+The contents of the `deps/llhttp` folder should look like the following:
+
+```bash
+$ find deps/llhttp
+
+deps/llhttp/
+deps/llhttp/CMakeLists.txt
+deps/llhttp/include
+deps/llhttp/include/llhttp.h
+deps/llhttp/llhttp.gyp
+deps/llhttp/README.md
+deps/llhttp/common.gypi
+deps/llhttp/libllhttp.pc.in
+deps/llhttp/LICENSE-MIT
+deps/llhttp/src
+deps/llhttp/src/api.c
+deps/llhttp/src/http.c
+deps/llhttp/src/llhttp.c
 ```
 
+After updating, make sure the version in `CMakeLists.txt` and `include/llhttp.h`
+are the same and that they match the one you are expecting.
+
 The low-level implementation is made available in the Node.js API through
 JavaScript code in the [lib](https://github.com/nodejs/node/tree/HEAD/lib)
 directory and C++ code in the

tools/update-llhttp.sh

@@ -0,0 +1,63 @@
+#!/bin/sh
+set -e
+
+# Shell script to update llhttp in the source tree to specific version
+
+BASE_DIR="$( pwd )"/
+DEPS_DIR="${BASE_DIR}deps/"
+LLHTTP_VERSION="$1"
+
+if [ "$#" -le 0 ]; then
+  echo "Error: Please provide an llhttp version to update to."
+  echo "Error: To download directly from GitHub, use the organization/repository syntax, without the .git suffix."
+  exit 1
+fi
+
+cleanup () {
+  EXIT_CODE=$?
+  [ -d "$WORKSPACE" ] && rm -rf "$WORKSPACE"
+  exit $EXIT_CODE
+}
+
+echo "Making temporary workspace ..."
+WORKSPACE=$(mktemp -d 2> /dev/null || mktemp -d -t 'tmp')
+trap cleanup INT TERM EXIT
+
+cd "$WORKSPACE"
+
+if echo "$LLHTTP_VERSION" | grep -qs "/" ; then # Download a release
+  REPO="git@github.com:$LLHTTP_VERSION.git"
+  BRANCH=$2
+  [ -z "$BRANCH" ] && BRANCH=main
+
+  echo "Cloning llhttp source archive $REPO ..."
+  git clone "$REPO" llhttp
+  cd llhttp
+  echo "Checking out branch $BRANCH ..."
+  git checkout "$BRANCH"
+
+  echo "Building llhtttp ..."
+  npm install
+  make release
+
+  echo "Copying llhtttp release ..."
+  rm -rf "$DEPS_DIR/llhttp"
+  cp -a release "$DEPS_DIR/llhttp"
+else
+  echo "Download llhttp release $LLHTTP_VERSION ..."
+  curl -sL -o llhttp.tar.gz "https://github.com/nodejs/llhttp/archive/refs/tags/release/v$LLHTTP_VERSION.tar.gz"
+  gzip -dc llhttp.tar.gz | tar xf -
+
+  echo "Copying llhtttp release ..."
+  rm -rf "$DEPS_DIR/llhttp"
+  cp -a "llhttp-release-v$LLHTTP_VERSION" "$DEPS_DIR/llhttp"
+fi
+
+echo ""
+echo "All done!"
+echo ""
+echo "Please git add llhttp, commit the new version:"
+echo ""
+echo "$ git add -A deps/llhttp"
+echo "$ git commit -m \"deps: update nghttp2 to $LLHTTP_VERSION\""
+echo ""