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# Copyright 1999-2019 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=6

CMAKE_MAKEFILE_GENERATOR="ninja"

inherit cmake-utils systemd toolchain-funcs user

DESCRIPTION="An OSS column-oriented database management system for real-time data analysis"
HOMEPAGE="https://clickhouse.yandex"
LICENSE="Apache-2.0"

MY_PN="ClickHouse"
TYPE="stable"

CCTZ_COMMIT="4f9776a"
SRC_URI="https://github.com/yandex/${MY_PN}/archive/v${PV}-${TYPE}.zip -> ${P}.zip
	https://github.com/google/cctz/archive/${CCTZ_COMMIT}.tar.gz -> cctz-${CCTZ_COMMIT}.tar.gz
"

SLOT="0/${TYPE}"
IUSE="+client cpu_flags_x86_sse4_2 +server debug doc kafka mongodb mysql static test tools"
KEYWORDS="~amd64"

REQUIRED_USE="
	server? ( cpu_flags_x86_sse4_2 )
	static? ( client server tools )
"

RDEPEND="
	dev-libs/re2:0=
	!static? (
		>=app-arch/lz4-1.8.0:=
		>=app-arch/zstd-1.3.4:=
		client? (
			sys-libs/ncurses:0=
			sys-libs/readline:0=
		)

		dev-libs/double-conversion
		dev-libs/capnproto
		dev-libs/libltdl:0
		sys-libs/libunwind:7
		sys-libs/zlib
		dev-libs/poco[odbc]
		dev-libs/icu:=
		dev-libs/glib
		>=dev-libs/boost-1.65.0:=
		dev-libs/openssl:0=
		kafka? ( dev-libs/librdkafka:= )
		mysql? ( virtual/libmysqlclient )
	)

	>=dev-libs/poco-1.9.0
	dev-libs/libpcre
	dev-libs/jemalloc
	dev-libs/protobuf
"

DEPEND="${RDEPEND}
	doc? ( >=dev-python/mkdocs-1.0.1 )
	static? (
		>=app-arch/lz4-1.8.0[static-libs]
		>=app-arch/zstd-1.3.4[static-libs]
		client? (
			sys-libs/ncurses:0=[static-libs]
			sys-libs/readline:0=[static-libs]
		)
		dev-libs/double-conversion[static-libs]
		dev-libs/capnproto[static-libs]
		dev-libs/libltdl[static-libs]
		sys-libs/libunwind:7[static-libs]
		sys-libs/zlib[static-libs]
		|| (
			dev-db/unixODBC[static-libs]
			dev-libs/poco[odbc]
		)
		dev-libs/icu[static-libs]
		dev-libs/glib[static-libs]
		>=dev-libs/boost-1.65.0[static-libs]
		dev-libs/openssl[static-libs]
		virtual/libmysqlclient[static-libs]
		kafka? ( dev-libs/librdkafka[static-libs] )
	)

	sys-libs/libtermcap-compat
	dev-util/patchelf
	>=sys-devel/lld-6.0.0
	>=sys-devel/gcc-7.0
	>=sys-devel/clang-6.0
"

S="${WORKDIR}/${MY_PN}-${PV}-${TYPE}"

_clang_fullversion() {
	local ver="$1"; shift
	set -- $($(tc-getCPP "$@") -E -P - <<<"__clang_major__ __clang_minor__ __clang_patchlevel__")
	eval echo "$ver"
}

clang-fullversion() {
	_clang_fullversion '$1.$2.$3' "$@"
}

clang-version() {
	_clang_fullversion '$1.$2' "$@"
}

clang-major-version() {
	_clang_fullversion '$1' "$@"
}

clang-minor-version() {
	_clang_fullversion '$2' "$@"
}

clang-micro-version() {
	_clang_fullversion '$3' "$@"
}

pkg_pretend() {
	if [[ $(tc-getCC) == clang ]]; then
		if [[ $(clang-major-version) -lt 6 ]]; then
			eerror "Compilation with clang older than 6.0 is not supported"
			die "Too old clang found"
		fi
		:
	elif [[ $(gcc-major-version) -lt 7 ]] && [[$(gcc-minor-version) -lt 2 ]]; then
		eerror "Compilation with gcc older than 7.2 is not supported"
		die "Too old gcc found"
	fi
}

src_unpack() {
	default_src_unpack
	[[ ${PV} == 9999 ]] && return 0
	cd "${S}/contrib" || die "failed to cd to contrib"
	mkdir -p cctz zstd || die "failed to create directories"
	tar --strip-components=1 -C cctz -xf "${DISTDIR}/cctz-${CCTZ_COMMIT}.tar.gz" || die "failed to unpack cctz"
}

src_prepare() {
	eapply_user
	cmake-utils_src_prepare
}
src_configure() {
	local mycmakeargs=(
		-DENABLE_POCO_MONGODB="$(usex mongodb)"
		-DENABLE_RDKAFKA="$(usex kafka)"
		-DENABLE_TESTS="$(usex test)"
		-DUSE_STATIC_LIBRARIES="$(usex static)"
		-DMAKE_STATIC_LIBRARIES="$(usex static)"
		-DUSE_MYSQL="$(usex mysql)"
		-DENABLE_CLICKHOUSE_SERVER="$(usex server)"
		-DENABLE_CLICKHOUSE_CLIENT="$(usex client)"
		-DENABLE_CLICKHOUSE_LOCAL="$(usex tools)"
		-DENABLE_CLICKHOUSE_BENCHMARK="$(usex tools)"
		-DENABLE_CLICKHOUSE_PERFORMANCE="$(usex tools)"
		-DENABLE_CLICKHOUSE_EXTRACT_FROM_CONFIG="$(usex tools)"
		-DENABLE_CLICKHOUSE_COMPRESSOR="$(usex tools)"
		-DENABLE_CLICKHOUSE_COPIER="$(usex tools)"
		# As of now, clickhouse fails to build if odbc is disabled
		-DENABLE_ODBC=True
		-DENABLE_CLICKHOUSE_ODBC_BRIDGE=True
		-DENABLE_CLICKHOUSE_ALL=OFF
		-DUSE_INTERNAL_SSL_LIBRARY=False
		-DUSE_INTERNAL_CITYHASH_LIBRARY=ON # Clickhouse explicitly requires bundled patched cityhash
		-DUNBUNDLED=ON
	)

	cmake-utils_src_configure
}

src_install() {
	cmake-utils_src_install

	if ! use test; then
		rm -rf "${D}/usr/share/clickhouse-test" || die "failed to remove tests"
	fi

	if use doc; then
		pushd "${S}/docs/tools" || die "Failed to enter docs build directory"
		./build.py || die "Failed to build docs"
		popd || die "Failed to exit docs build directory"

		dodoc -r "${S}/docs/build"
	fi

	if use server; then
		newinitd "${FILESDIR}"/clickhouse-server.initd clickhouse-server
		systemd_dounit "${FILESDIR}"/clickhouse-server.service
	fi

	keepdir /var/log/clickhouse-server
	chown clickhouse:clickhouse "${D}"/var/log/clickhouse-server
}

pkg_preinst() {
	if use server; then
		enewgroup clickhouse
		enewuser clickhouse -1 -1 /var/lib/clickhouse clickhouse
	fi
}