Curl extension for the Node.js build of PHP.wasm (#1273)

Ships the Node.js version of PHP built with `--with-libcurl` option to support the curl extension.

It also changes two nuances in the overall PHP build process:

* It replaces the `select(2)` function using `-Wl,--wrap=select` emcc
option instead of patching PHP source code – this enables supporting
asynchronous `select(2)` in curl without additional patches.
* Brings the `__wrap_select` implementation more in line with
`select(2)`, add support for `POLLERR`.
* Adds support for polling file descriptors that represent neither child
processes nor streams in `poll(2)` – that's because `libcurl` polls
`/dev/urandom`.

Builds on top of and supersedes
#1133

## Debugging Asyncify problems

The [typical way of resolving Asyncify
crashes](https://wordpress.github.io/wordpress-playground/architecture/wasm-asyncify/)
didn't work during the work on this PR. Functions didn't come up in the
error messages and even raw stack traces. The reasons are unclear.

[The JSPI build of
PHP](#1339) was
more helpful as it enabled logging the current stack trace in all the
asynchronous calls, which quickly revealed all the missing
`ASYNCIFY_ONLY` functions. This is the way to debug any future issues
until we fully migrate to JSPI.

## Testing Instructions

Confirm the CI checks pass. This PR ships a few new tests specifically
targeting networking with curl.


## Related resources

* #85
* #1093

---------

Co-authored-by: Adam Zieliński <adam@adamziel.com>
Co-authored-by: MHO <yannick@chillpills.io>

packages/php-wasm/compile/Makefile

@@ -28,7 +28,7 @@ libzip/dist/1.9.2/root/lib/lib/libzip.a: base-image libz
 libpng16: libpng16/dist/root/lib/lib/libpng16.a
 libpng16/dist/root/lib/lib/libpng16.a: base-image libz
 	mkdir -p ./libpng16/dist/root/lib
-	docker build -f ./libpng16/Dockerfile -t playground-php-wasm:libpng . 
+	docker build -f ./libpng16/Dockerfile -t playground-php-wasm:libpng .
 	docker cp $$(docker create playground-php-wasm:libpng):/root/install/lib ./libpng16/dist/root/lib
 	docker cp $$(docker create playground-php-wasm:libpng):/root/install/include ./libpng16/dist/root/lib
 
@@ -88,7 +88,21 @@ oniguruma/dist/root/lib/lib/libonig.a: base-image
 	docker cp $$(docker create playground-php-wasm:oniguruma):/root/lib/lib ./oniguruma/dist/root/lib/
 	docker cp $$(docker create playground-php-wasm:oniguruma):/root/lib/include ./oniguruma/dist/root/lib
 
-all: libz libzip libpng16 libxml2 libopenssl libsqlite3 libiconv libncurses libedit bison2.7 oniguruma
+libcurl: libcurl/dist/root/lib/lib/libcurl.a
+libcurl/dist/root/lib/lib/libcurl.a: base-image libz libopenssl
+	mkdir -p ./libcurl/dist/root/lib
+	docker build -f ./libcurl/Dockerfile -t playground-php-wasm:libcurl . --progress=plain
+	docker cp $$(docker create playground-php-wasm:libcurl):/root/curl-7.69.1/lib/.libs ./libcurl/dist/root/lib/lib
+	docker cp $$(docker create playground-php-wasm:libcurl):/root/curl-7.69.1/include/ ./libcurl/dist/root/lib
+
+libcurl7.15: libcurl7.15/dist/root/lib/lib/libcurl.a
+libcurl7.15/dist/root/lib/lib/libcurl.a: base-image libz libopenssl
+	mkdir -p ./libcurl7.15/dist/root/lib
+	docker build -f ./libcurl7.15/Dockerfile -t playground-php-wasm:libcurl7.15 . --progress=plain
+	docker cp $$(docker create playground-php-wasm:libcurl):/root/curl-7.15.5/lib/.libs ./libcurl7.15/dist/root/lib/lib
+	docker cp $$(docker create playground-php-wasm:libcurl):/root/curl-7.15.5/include/ ./libcurl7.15/dist/root/lib
+
+all: libz libzip libpng16 libxml2 libopenssl libsqlite3 libiconv libncurses libedit bison2.7 oniguruma libcurl libcurl7.15
 clean:
 	rm -rf ./libz/dist
 	rm -rf ./libzip/dist

packages/php-wasm/compile/build.js

@@ -132,6 +132,7 @@ const platformDefaults = {
 		WITH_OPENSSL: 'yes',
 	},
 	node: {
+		WITH_CURL: 'yes',
 		WITH_FILEINFO: 'yes',
 		WITH_ICONV: 'yes',
 		WITH_LIBXML: 'yes',

packages/php-wasm/compile/libcurl/Dockerfile

@@ -0,0 +1,66 @@
+FROM playground-php-wasm:base
+
+RUN mkdir -p /root/lib/include /root/lib/lib
+COPY ./libz/dist/root/lib/include /root/lib/include
+COPY ./libz/dist/root/lib/lib /root/lib/lib
+COPY ./libopenssl/dist/root/lib/include /root/lib/include
+COPY ./libopenssl/dist/root/lib/lib /root/lib/lib
+
+ARG CURL_VERSION="curl-7.69.1"
+
+RUN /root/copy-lib.sh lib-libz
+RUN set -euxo pipefail && \
+    source /root/emsdk/emsdk_env.sh && \
+    wget https://curl.haxx.se/download/$CURL_VERSION.tar.gz && \
+    tar xf $CURL_VERSION.tar.gz
+
+WORKDIR /root/$CURL_VERSION
+
+RUN CPPFLAGS="-I/root/lib/include " \
+    LDFLAGS="-L/root/lib/lib " \
+    PKG_CONFIG_PATH=$PKG_CONFIG_PATH \
+    source /root/emsdk/emsdk_env.sh && \
+    emconfigure ./configure \
+        --build i386-pc-linux-gnu \
+        --target wasm32-unknown-emscripten \
+        --prefix=/root/lib/ \
+        --disable-shared \
+        --enable-static \
+        --with-ssl \
+        --with-openssl=/root/lib \
+        --enable-https \
+        --enable-http \
+        --disable-pop3 \
+        --disable-imap \
+        --disable-smb \
+        --disable-smtp \
+        --disable-telnet \
+        --disable-gopher \
+        --disable-ftp \
+        --disable-ftps \
+        --disable-rtsp \
+        --disable-tftp \
+        --disable-pthreads \
+        --disable-threaded-resolver \
+        --with-zlib=/root/lib
+
+RUN cp /root/emsdk/upstream/bin/wasm-ld /root/emsdk/upstream/bin/wasm-ld-original && \
+    echo $'#!/bin/bash\n\
+if [[ " $@ " =~ " -o curl " ]]; then \n\
+echo '' > /root/curl-7.69.1/src/curl; \n\
+echo '' > /root/curl-7.69.1/curl; \n\
+fi; \n\
+/root/emsdk/upstream/bin/wasm-ld-original "$@" || true; \n\
+exit 0; \n' > /root/emsdk/upstream/bin/wasm-ld && \
+    chmod a+x /root/emsdk/upstream/bin/wasm-ld
+
+
+RUN source /root/emsdk/emsdk_env.sh && \
+EMCC_SKIP="-lc -lz -lcurl -lssl " \
+EMCC_FLAGS="-sSIDE_MODULE -Wl,--wrap=select " emmake make -i || true 
+
+RUN source /root/emsdk/emsdk_env.sh && \
+EMCC_SKIP="-lc -lz -lcurl -lssl " \
+EMCC_FLAGS="-sSIDE_MODULE -Wl,--wrap=select " emmake make install -i || true
+
+RUN ls -R /root/lib