private

hyper/capi/gen_header.sh

@@ -0,0 +1,108 @@
+#!/usr/bin/env bash
+
+# This script regenerates hyper.h. As of April 2021, it only works with the
+# nightly build of Rust.
+
+set -e
+
+CAPI_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+
+WORK_DIR=$(mktemp -d)
+
+# check if tmp dir was created
+if [[ ! "$WORK_DIR" || ! -d "$WORK_DIR" ]]; then
+    echo "Could not create temp dir"
+    exit 1
+fi
+
+header_file_backup="$CAPI_DIR/include/hyper.h.backup"
+
+function cleanup {
+    rm -rf "$WORK_DIR"
+    rm "$header_file_backup" || true
+}
+
+trap cleanup EXIT
+
+mkdir "$WORK_DIR/src"
+
+# Fake a library
+cat > "$WORK_DIR/src/lib.rs" << EOF
+#[path = "$CAPI_DIR/../src/ffi/mod.rs"]
+pub mod ffi;
+EOF
+
+# And its Cargo.toml
+cat > "$WORK_DIR/Cargo.toml" << EOF
+[package]
+name = "hyper"
+version = "0.0.0"
+edition = "2018"
+publish = false
+
+[dependencies]
+# Determined which dependencies we need by running the "cargo rustc" command
+# below and watching the compile error output for references to unknown imports,
+# until we didn't get any errors.
+bytes = "1"
+futures-channel = "0.3"
+futures-util = { version = "0.3", default-features = false, features = ["alloc"] }
+libc = { version = "0.2", optional = true }
+http = "0.2"
+http-body = "0.4"
+tokio = { version = "1", features = ["rt"] }
+
+[features]
+default = [
+    "client",
+    "ffi",
+    "http1",
+]
+
+http1 = []
+client = []
+ffi = ["libc", "tokio/rt"]
+EOF
+
+cp "$CAPI_DIR/include/hyper.h" "$header_file_backup"
+
+#cargo metadata --no-default-features --features ffi --format-version 1 > "$WORK_DIR/metadata.json"
+
+cd "${WORK_DIR}" || exit 2
+
+# Expand just the ffi module
+if ! output=$(RUSTFLAGS='--cfg hyper_unstable_ffi' cargo rustc -- -Z unpretty=expanded 2>&1 > expanded.rs); then
+    # As of April 2021 the script above prints a lot of warnings/errors, and
+    # exits with a nonzero return code, but hyper.h still gets generated.
+    #
+    # However, on Github Actions, this will result in automatic "annotations"
+    # being added to files not related to a PR, so if this is `--verify` mode,
+    # then don't show it.
+    #
+    # But yes show it when using it locally.
+    if [[ "--verify" != "$1" ]]; then
+        echo "$output"
+    fi
+fi
+
+# Replace the previous copy with the single expanded file
+rm -rf ./src
+mkdir src
+mv expanded.rs src/lib.rs
+
+
+# Bindgen!
+if ! cbindgen \
+    --config "$CAPI_DIR/cbindgen.toml" \
+    --lockfile "$CAPI_DIR/../Cargo.lock" \
+    --output "$CAPI_DIR/include/hyper.h" \
+    "${@}"; then
+    bindgen_exit_code=$?
+    if [[ "--verify" == "$1" ]]; then
+        echo "diff generated (<) vs backup (>)"
+        diff "$CAPI_DIR/include/hyper.h" "$header_file_backup"
+    fi
+    exit $bindgen_exit_code
+fi
+
+exit 0