#!/bin/bash
#
# **inc/python** - Python-related functions
#
# Support for pip/setuptools interfaces and virtual environments
#
# External functions used:
# - GetOSVersion
# - is_fedora
# - is_suse
# - safe_chown

# Save trace setting
INC_PY_TRACE=$(set +o | grep xtrace)
set +o xtrace


# Global Config Variables

# PROJECT_VENV contains the name of the virtual environment for each
# project.  A null value installs to the system Python directories.
declare -A -g PROJECT_VENV


# Python Functions
# ================

# Get the path to the pip command.
# get_pip_command
function get_pip_command {
    local version="$1"
    # NOTE(dhellmann): I don't know if we actually get a pip3.4-python
    # under any circumstances.
    which pip${version} || which pip${version}-python

    if [ $? -ne 0 ]; then
        die $LINENO "Unable to find pip${version}; cannot continue"
    fi
}

# Get the path to the directory where python executables are installed.
# get_python_exec_prefix
function get_python_exec_prefix {
    local xtrace
    xtrace=$(set +o | grep xtrace)
    set +o xtrace
    if [[ -z "$os_PACKAGE" ]]; then
        GetOSVersion
    fi
    $xtrace

    if python3_enabled && [[ "$os_VENDOR" == "Fedora" && $os_RELEASE -gt 26 ]]; then
        # Default Python 3 install prefix changed to /usr/local in Fedora 27:
        # https://fedoraproject.org/wiki/Changes/Making_sudo_pip_safe
        echo "/usr/local/bin"
    elif is_fedora || is_suse; then
        echo "/usr/bin"
    else
        echo "/usr/local/bin"
    fi
}

# Wrapper for ``pip install`` that only installs versions of libraries
# from the global-requirements specification.
#
# Uses globals ``REQUIREMENTS_DIR``
#
# pip_install_gr packagename
function pip_install_gr {
    local name=$1
    local clean_name
    clean_name=$(get_from_global_requirements $name)
    pip_install $clean_name
}

# Wrapper for ``pip install`` that only installs versions of libraries
# from the global-requirements specification with extras.
#
# Uses globals ``REQUIREMENTS_DIR``
#
# pip_install_gr_extras packagename extra1,extra2,...
function pip_install_gr_extras {
    local name=$1
    local extras=$2
    local clean_name
    clean_name=$(get_from_global_requirements $name)
    pip_install $clean_name[$extras]
}

# Determine the python versions supported by a package
function get_python_versions_for_package {
    local name=$1
    cd $name && python setup.py --classifiers \
        | grep 'Language' | cut -f5 -d: | grep '\.' | tr '\n' ' '
}

# Check for python3 classifier in local directory
function check_python3_support_for_package_local {
    local name=$1
    cd $name
    set +e
    classifier=$(python setup.py --classifiers \
        | grep 'Programming Language :: Python :: 3$')
    set -e
    echo $classifier
}

# Check for python3 classifier on pypi
function check_python3_support_for_package_remote {
    local name=$1
    set +e
    classifier=$(curl -s -L "https://pypi.python.org/pypi/$name/json" \
        | grep '"Programming Language :: Python :: 3"')
    set -e
    echo $classifier
}

# python3_enabled_for() assumes the service(s) specified as arguments are
# enabled for python 3 unless explicitly disabled. See python3_disabled_for().
#
# Multiple services specified as arguments are ``OR``'ed together; the test
# is a short-circuit boolean, i.e it returns on the first match.
#
# python3_enabled_for dir [dir ...]
function python3_enabled_for {
    local xtrace
    xtrace=$(set +o | grep xtrace)
    set +o xtrace

    local enabled=1
    local dirs=$@
    local dir
    for dir in ${dirs}; do
        if ! python3_disabled_for "${dir}"; then
            enabled=0
        fi
    done

    $xtrace
    return $enabled
}

# python3_disabled_for() checks if the service(s) specified as arguments are
# disabled by the user in ``DISABLED_PYTHON3_PACKAGES``.
#
# Multiple services specified as arguments are ``OR``'ed together; the test
# is a short-circuit boolean, i.e it returns on the first match.
#
# Uses global ``DISABLED_PYTHON3_PACKAGES``
# python3_disabled_for dir [dir ...]
function python3_disabled_for {
    local xtrace
    xtrace=$(set +o | grep xtrace)
    set +o xtrace

    local enabled=1
    local dirs=$@
    local dir
    for dir in ${dirs}; do
        [[ ,${DISABLED_PYTHON3_PACKAGES}, =~ ,${dir}, ]] && enabled=0
    done

    $xtrace
    return $enabled
}

# enable_python3_package() -- no-op for backwards compatibility
#
# For example:
#   enable_python3_package nova
#
# enable_python3_package dir [dir ...]
function enable_python3_package {
    local xtrace
    xtrace=$(set +o | grep xtrace)
    set +o xtrace

    echo "It is no longer necessary to call enable_python3_package()."

    $xtrace
}

# disable_python3_package() adds the services passed as argument to
# the ``DISABLED_PYTHON3_PACKAGES`` list.
#
# For example:
#   disable_python3_package swift
#
# Uses global ``DISABLED_PYTHON3_PACKAGES``
# disable_python3_package dir [dir ...]
function disable_python3_package {
    local xtrace
    xtrace=$(set +o | grep xtrace)
    set +o xtrace

    local disabled_svcs="${DISABLED_PYTHON3_PACKAGES}"
    local dir
    for dir in $@; do
        disabled_svcs+=",$dir"
    done
    DISABLED_PYTHON3_PACKAGES=$(_cleanup_service_list "$disabled_svcs")

    $xtrace
}

# Wrapper for ``pip install`` to set cache and proxy environment variables
# Uses globals ``OFFLINE``, ``PIP_VIRTUAL_ENV``,
# ``PIP_UPGRADE``, ``TRACK_DEPENDS``, ``*_proxy``,
# Usage:
#  pip_install pip_arguments
function pip_install {
    local xtrace result
    xtrace=$(set +o | grep xtrace)
    set +o xtrace
    local upgrade=""
    local offline=${OFFLINE:-False}
    if [[ "$offline" == "True" || -z "$@" ]]; then
        $xtrace
        return
    fi

    time_start "pip_install"

    PIP_UPGRADE=$(trueorfalse False PIP_UPGRADE)
    if [[ "$PIP_UPGRADE" = "True" ]] ; then
        upgrade="--upgrade"
    fi

    if [[ -z "$os_PACKAGE" ]]; then
        GetOSVersion
    fi

    # Try to extract the path of the package we are installing into
    # package_dir.  We need this to check for test-requirements.txt,
    # at least.
    #
    # ${!#} expands to the last positional argument to this function.
    # With "extras" syntax included, our arguments might be something
    # like:
    #  -e /path/to/fooproject[extra]
    # Thus this magic line grabs just the path without extras
    #
    # Note that this makes no sense if this is a pypi (rather than
    # local path) install; ergo you must check this path exists before
    # use.  Also, if we had multiple or mixed installs, we would also
    # likely break.  But for historical reasons, it's basically only
    # the other wrapper functions in here calling this to install
    # local packages, and they do so with single call per install.  So
    # this works (for now...)
    local package_dir=${!#%\[*\]}

    if [[ $TRACK_DEPENDS = True && ! "$@" =~ virtualenv ]]; then
        # TRACK_DEPENDS=True installation creates a circular dependency when
        # we attempt to install virtualenv into a virtualenv, so we must global
        # that installation.
        source $DEST/.venv/bin/activate
        local cmd_pip=$DEST/.venv/bin/pip
        local sudo_pip="env"
    else
        if [[ -n ${PIP_VIRTUAL_ENV:=} && -d ${PIP_VIRTUAL_ENV} ]]; then
            local cmd_pip=$PIP_VIRTUAL_ENV/bin/pip
            local sudo_pip="env"
        else
            local cmd_pip
            cmd_pip=$(get_pip_command $PYTHON2_VERSION)
            local sudo_pip="sudo -H"
            if python3_enabled; then
                # Look at the package classifiers to find the python
                # versions supported, and if we find the version of
                # python3 we've been told to use, use that instead of the
                # default pip
                local python_versions

                # Special case some services that have experimental
                # support for python3 in progress, but don't claim support
                # in their classifier
                echo "Check python version for : $package_dir"
                if python3_disabled_for ${package_dir##*/}; then
                    echo "Explicitly using $PYTHON2_VERSION version to install $package_dir based on DISABLED_PYTHON3_PACKAGES"
                elif python3_enabled_for ${package_dir##*/}; then
                    echo "Using $PYTHON3_VERSION version to install $package_dir based on default behavior"
                    sudo_pip="$sudo_pip LC_ALL=en_US.UTF-8"
                    cmd_pip=$(get_pip_command $PYTHON3_VERSION)
                elif [[ -d "$package_dir" ]]; then
                    python_versions=$(get_python_versions_for_package $package_dir)
                    if [[ $python_versions =~ $PYTHON3_VERSION ]]; then
                        echo "Automatically using $PYTHON3_VERSION version to install $package_dir based on classifiers"
                        sudo_pip="$sudo_pip LC_ALL=en_US.UTF-8"
                        cmd_pip=$(get_pip_command $PYTHON3_VERSION)
                    else
                        # The package may not have yet advertised python3.5
                        # support so check for just python3 classifier and log
                        # a warning.
                        python3_classifier=$(check_python3_support_for_package_local $package_dir)
                        if [[ ! -z "$python3_classifier" ]]; then
                            echo "Automatically using $PYTHON3_VERSION version to install $package_dir based on local package settings"
                            sudo_pip="$sudo_pip LC_ALL=en_US.UTF-8"
                            cmd_pip=$(get_pip_command $PYTHON3_VERSION)
                        fi
                    fi
                else
                    # Check pypi as we don't have the package on disk
                    package=$(echo $package_dir | grep -o '^[.a-zA-Z0-9_-]*')
                    python3_classifier=$(check_python3_support_for_package_remote $package)
                    if [[ ! -z "$python3_classifier" ]]; then
                        echo "Automatically using $PYTHON3_VERSION version to install $package based on remote package settings"
                        sudo_pip="$sudo_pip LC_ALL=en_US.UTF-8"
                        cmd_pip=$(get_pip_command $PYTHON3_VERSION)
                    fi
                fi
            fi
        fi
    fi

    cmd_pip="$cmd_pip install"
    # Always apply constraints
    cmd_pip="$cmd_pip -c $REQUIREMENTS_DIR/upper-constraints.txt"

    # FIXME(dhellmann): Need to force multiple versions of pip for
    # packages like setuptools?
    local pip_version
    pip_version=$(python -c "import pip; \
                        print(pip.__version__.split('.')[0])")
    if (( pip_version<6 )); then
        die $LINENO "Currently installed pip version ${pip_version} does not" \
            "meet minimum requirements (>=6)."
    fi

    $xtrace

    # Also install test requirements
    local install_test_reqs=""
    local test_req="${package_dir}/test-requirements.txt"
    if [[ -e "$test_req" ]]; then
        install_test_reqs="-r $test_req"
    fi

    # adding SETUPTOOLS_SYS_PATH_TECHNIQUE is a workaround to keep
    # the same behaviour of setuptools before version 25.0.0.
    # related issue: https://github.com/pypa/pip/issues/3874
    $sudo_pip \
        http_proxy="${http_proxy:-}" \
        https_proxy="${https_proxy:-}" \
        no_proxy="${no_proxy:-}" \
        PIP_FIND_LINKS=$PIP_FIND_LINKS \
        SETUPTOOLS_SYS_PATH_TECHNIQUE=rewrite \
        $cmd_pip $upgrade $install_test_reqs \
        $@
    result=$?

    time_stop "pip_install"
    return $result
}

function pip_uninstall {
    # Skip uninstall if offline
    [[ "${OFFLINE}" = "True" ]] && return

    local name=$1
    if [[ -n ${PIP_VIRTUAL_ENV:=} && -d ${PIP_VIRTUAL_ENV} ]]; then
        local cmd_pip=$PIP_VIRTUAL_ENV/bin/pip
        local sudo_pip="env"
    else
        local cmd_pip
        cmd_pip=$(get_pip_command $PYTHON2_VERSION)
        local sudo_pip="sudo -H"
    fi
    # don't error if we can't uninstall, it might not be there
    $sudo_pip $cmd_pip uninstall -y $name || /bin/true
}

# get version of a package from global requirements file
# get_from_global_requirements <package>
function get_from_global_requirements {
    local package=$1
    local required_pkg
    required_pkg=$(grep -i -h ^${package} $REQUIREMENTS_DIR/global-requirements.txt | cut -d\# -f1)
    if [[ $required_pkg == ""  ]]; then
        die $LINENO "Can't find package $package in requirements"
    fi
    echo $required_pkg
}

# should we use this library from their git repo, or should we let it
# get pulled in via pip dependencies.
function use_library_from_git {
    local name=$1
    local enabled=1
    [[ ${LIBS_FROM_GIT} = 'ALL' ]] || [[ ,${LIBS_FROM_GIT}, =~ ,${name}, ]] && enabled=0
    return $enabled
}

# determine if a package was installed from git
function lib_installed_from_git {
    local name=$1
    local safe_name
    safe_name=$(python -c "from pkg_resources import safe_name; \
        print(safe_name('${name}'))")
    # Note "pip freeze" doesn't always work here, because it tries to
    # be smart about finding the remote of the git repo the package
    # was installed from.  This doesn't work with zuul which clones
    # repos with no remote.
    #
    # The best option seems to be to use "pip list" which will tell
    # you the path an editable install was installed from; for example
    # in response to something like
    #  pip install -e 'git+http://git.openstack.org/openstack-dev/bashate#egg=bashate'
    # pip list --format columns shows
    #  bashate 0.5.2.dev19 /tmp/env/src/bashate
    # Thus we check the third column to see if we're installed from
    # some local place.
    [[ -n $(pip list --format=columns 2>/dev/null | awk "/^$safe_name/ {print \$3}") ]]
}

# setup a library by name. If we are trying to use the library from
# git, we'll do a git based install, otherwise we'll punt and the
# library should be installed by a requirements pull from another
# project.
function setup_lib {
    local name=$1
    local dir=${GITDIR[$name]}
    setup_install $dir
}

# setup a library by name in editable mode. If we are trying to use
# the library from git, we'll do a git based install, otherwise we'll
# punt and the library should be installed by a requirements pull from
# another project.
#
# use this for non namespaced libraries
function setup_dev_lib {
    local name=$1
    local dir=${GITDIR[$name]}
    if python3_enabled; then
        # Turn off Python 3 mode and install the package again,
        # forcing a Python 2 installation. This ensures that all libs
        # being used for development are installed under both versions
        # of Python.
        echo "Installing $name again without Python 3 enabled"
        USE_PYTHON3=False
        setup_develop $dir
        USE_PYTHON3=True
    fi
    setup_develop $dir
}

# this should be used if you want to install globally, all libraries should
# use this, especially *oslo* ones
#
# setup_install project_dir [extras]
# project_dir: directory of project repo (e.g., /opt/stack/keystone)
# extras: comma-separated list of optional dependencies to install
#         (e.g., ldap,memcache).
#         See https://docs.openstack.org/pbr/latest/user/using.html#extra-requirements
# The command is like "pip install <project_dir>[<extras>]"
function setup_install {
    local project_dir=$1
    local extras=$2
    _setup_package_with_constraints_edit $project_dir "" $extras
}

# this should be used for projects which run services, like all services
#
# setup_develop project_dir [extras]
# project_dir: directory of project repo (e.g., /opt/stack/keystone)
# extras: comma-separated list of optional dependencies to install
#         (e.g., ldap,memcache).
#         See https://docs.openstack.org/pbr/latest/user/using.html#extra-requirements
# The command is like "pip install -e <project_dir>[<extras>]"
function setup_develop {
    local project_dir=$1
    local extras=$2
    _setup_package_with_constraints_edit $project_dir -e $extras
}

# ``pip install -e`` the package, which processes the dependencies
# using pip before running `setup.py develop`
#
# Updates the constraints from REQUIREMENTS_DIR to reflect the
# future installed state of this package. This ensures when we
# install this package we get the from source version.
#
# Uses globals ``REQUIREMENTS_DIR``
# _setup_package_with_constraints_edit project_dir flags [extras]
# project_dir: directory of project repo (e.g., /opt/stack/keystone)
# flags: pip CLI options/flags
# extras: comma-separated list of optional dependencies to install
#         (e.g., ldap,memcache).
#         See https://docs.openstack.org/pbr/latest/user/using.html#extra-requirements
# The command is like "pip install <flags> <project_dir>[<extras>]"
function _setup_package_with_constraints_edit {
    local project_dir=$1
    local flags=$2
    local extras=$3

    # Normalize the directory name to avoid
    # "installation from path or url cannot be constrained to a version"
    # error.
    # REVISIT(yamamoto): Remove this when fixed in pip.
    # https://github.com/pypa/pip/pull/3582
    project_dir=$(cd $project_dir && pwd)

    if [ -n "$REQUIREMENTS_DIR" ]; then
        # Constrain this package to this project directory from here on out.
        local name
        name=$(awk '/^name.*=/ {print $3}' $project_dir/setup.cfg)
        $REQUIREMENTS_DIR/.venv/bin/edit-constraints \
            $REQUIREMENTS_DIR/upper-constraints.txt -- $name \
            "$flags file://$project_dir#egg=$name"
    fi

    setup_package $project_dir "$flags" $extras

    # If this project is in LIBS_FROM_GIT, verify it was actually installed
    # correctly.  This helps catch errors caused by constraints mismatches.
    if use_library_from_git "$project_dir"; then
        if ! lib_installed_from_git "$project_dir"; then
            die $LINENO "The following LIBS_FROM_GIT was not installed correctly: $project_dir"
        fi
    fi
}

# ``pip install -e`` the package, which processes the dependencies
# using pip before running `setup.py develop`
#
# Uses globals ``STACK_USER``
# setup_package project_dir [flags] [extras]
# project_dir: directory of project repo (e.g., /opt/stack/keystone)
# flags: pip CLI options/flags
# extras: comma-separated list of optional dependencies to install
#         (e.g., ldap,memcache).
#         See https://docs.openstack.org/pbr/latest/user/using.html#extra-requirements
# The command is like "pip install <flags> <project_dir>[<extras>]"
function setup_package {
    local project_dir=$1
    local flags=$2
    local extras=$3

    # if the flags variable exists, and it doesn't look like a flag,
    # assume it's actually the extras list.
    if [[ -n "$flags" && -z "$extras" && ! "$flags" =~ ^-.* ]]; then
        extras=$flags
        flags=""
    fi

    if [[ ! -z "$extras" ]]; then
        extras="[$extras]"
    fi

    pip_install $flags "$project_dir$extras"
    # ensure that further actions can do things like setup.py sdist
    if [[ "$flags" == "-e" ]]; then
        safe_chown -R $STACK_USER $1/*.egg-info
    fi
}

# Report whether python 3 should be used
function python3_enabled {
    if [[ $USE_PYTHON3 == "True" ]]; then
        return 0
    else
        return 1
    fi
}

# Install python3 packages
function install_python3 {
    if is_ubuntu; then
        apt_get install python${PYTHON3_VERSION} python${PYTHON3_VERSION}-dev
    elif is_suse; then
        install_package python3-devel python3-dbm
    fi
}

function install_devstack_tools {
    # intentionally old to ensure devstack-gate has control
    local dstools_version=${DSTOOLS_VERSION:-0.1.2}
    install_python3
    sudo pip3 install -U devstack-tools==${dstools_version}
}

# Restore xtrace
$INC_PY_TRACE

# Local variables:
# mode: shell-script
# End: