PyHP-Interpreter

PyHP is a package that allows you to embed Python code like PHP code into HTML and other text files. A script is called either by the configuration of the web server or a shebang and communicates with the web server via WSGI.

Features:

• Parser for embedding python Code in HTML
• a bunch of PHP features implemented in python
• modular structure to allow the use of features outside of the interpreter
• automatic code alignment for improved readability
• caching

How it works:

Syntax

• like PHP, Python code is contained within the <?pyhp and ?> tags
• code sections are allowed to have a starting indentation for better readability inside (for example) HTML files
• unlike PHP, each code section of code must have a valid syntax of its own
  • if-Statements or loops can not span multiple code sections

Runtime

• module level constants are set and allow for source introspection if the backend supports it
• exit and sys.exit terminate the script, not the whole server
• atexit registered functions dont get called until server shutdown in WSGI mode
• since try statements can't span multiple code sections cleanup actions should be executed by register_shutdown_function

Usage

• can be used for
• CLI scripts with the pyhp-cli command
• CGI scripts by using the pyhp-cgi command
• WSGI servers by using the pyhp.wsgi.apps submodule
• if no name is given, the program is reading from stdin, else it is using the name to load code from the configured backend

Apps

• execute code and capture its output
• provide the code with an interface
• are available for single and multi-threaded environments
• can be constructed by factories contained in the pyhp.wsgi.util submodule

Interfaces

• act as an interface between the WSGI gateway and the script
• are available as thin WSGI wrappers or PHP-style interfaces

PHP Interface

• the following PHP features are available:
  • $_SERVER as SERVER
  • $_REQUEST as REQUEST
  • $_GET as GET
  • $_POST as POST
  • $_COOKIE as COOKIE
  • $_FILES as FILES
  • http_response_code
  • header
  • headers_list
  • header_remove
  • headers_sent
  • header_register_callback with an additional replace keyword argument to register multiple callbacks
  • setcookie with an additional samesite keyword argument
  • setrawcookie also with an additional samesite keyword argument
  • register_shutdown_function with reversed callback execution order (LIFO)
  • opcache_compile_file which raises Exceptions instead of returning False when compilation fails
  • opcache_invalidate
  • opcache_is_script_cached
  • opcache_reset

Config file

• is valid toml
• is looked for in these locations (no merging takes place, the first file wins):
  • the path given by the -c or --config cli argument
  • the path pointed to by the PYHPCONFIG environment variable
  • ~/.config/pyhp.toml
  • /etc/pyhp.toml
• raises a RuntimeError if not found

Backends

• implement code retrieval or decorate other backends to add i.a. caching
• act as containers for CodeSources
• form a hierarchy configured in pyhp.toml
• are contained inside pyhp.backends
• can be interacted with via the pyhp-backend or python3 -m pyhp.backends cli commands

Installation

This section shows you how to install PyHP on your computer. If you want to use pyhp scripts on your website by CGI you have to additionally enable CGI in your webserver.

Just as python package

1. build the pyhp-core python package with python3 setup.py bdist_wheel
2. Done! You can now install the wheel contained in the dist directory with pip

• Optional: set the PYHPCONFIG environ variable or copy pyhp.toml to one of the config file locations to use the CLI commands

Debian package

1. execute debian/build_deb.sh in the root directory of the project.
2. Done! You can now install the debian package with sudo dpkg -i python3-pyhp-core_{version}-1_all.deb

• Optional: check if the recommended packages python3-toml and python3-werkzeug are installed to use the CLI commands
• Important: pyhp-backend clear will be executed on uninstall or upgrade if the backend is a cache, remember this when using paths containing ~ for the file cache

Manually

1. install the pyhp-core python package
2. set the PYHPCONFIG environ variable or copy pyhp.toml to one of the config file locations
3. Done! You can now use the pyhp-* commands

WSGI Example

Manually

    import sys
    import re
    import tempfile
    from wsgiref.simple_server import make_server
    from pyhp.compiler import parsers, util, generic
    from pyhp.backends.files import Directory
    from pyhp.wsgi.apps import ConcurrentWSGIApp
    from pyhp.wsgi.proxys import LocalStackProxy
    from pyhp.wsgi.interfaces.php import PHPWSGIInterfaceFactory
    from pyhp.wsgi.interfaces.phputils import UploadStreamFactory


    compiler = util.Compiler(
        parsers.RegexParser(
            re.compile(r"<\?pyhp\s"),
            re.compile(r"\s\?>")
        ),
        util.Dedenter(
            generic.GenericCodeBuilder(-1)
        )
    )

    interface_factory = PHPWSGIInterfaceFactory(
        200,
        [("Content-type", "text/html; charset=\"UTF-8\"")],
        None,
        ("GET", "POST", "COOKIE"),
        8000000,
        UploadStreamFactory(
            tempfile.gettempdir(),
            20
        )
    )

    sys.stdout = proxy = LocalStackProxy(sys.stdout)

    with Directory(".", compiler) as backend:
        with ConcurrentWSGIApp("tests/embedding/syntax.pyhp", backend, proxy, interface_factory) as app:
            with make_server("", 8000, app) as httpd:
                httpd.serve_forever()

From a config file

  from wsgiref.simple_server import make_server
  import toml
  from pyhp.wsgi.util import ConcurrentWSGIAppFactory


  config = toml.load("pyhp.toml")

  with ConcurrentWSGIAppFactory.from_config(config) as factory:
      with factory.app("tests/embedding/syntax.pyhp") as app:
          with make_server("", 8000, app) as httpd:
              httpd.serve_forever()