"""
TestCmd.py:  a testing framework for commands and scripts.

The TestCmd module provides a framework for portable automated testing
of executable commands and scripts (in any language, not just Python),
especially commands and scripts that require file system interaction.

In addition to running tests and evaluating conditions, the TestCmd module
manages and cleans up one or more temporary workspace directories, and
provides methods for creating files and directories in those workspace
directories from in-line data, here-documents), allowing tests to be
completely self-contained.

A TestCmd environment object is created via the usual invocation:

    test = TestCmd()

The TestCmd module provides pass_test(), fail_test(), and no_result()
unbound methods that report test results for use with the Aegis change
management system.  These methods terminate the test immediately,
reporting PASSED, FAILED, or NO RESULT respectively, and exiting with
status 0 (success), 1 or 2 respectively.  This allows for a distinction
between an actual failed test and a test that could not be properly
evaluated because of an external condition (such as a full file system
or incorrect permissions).
"""

# Copyright 2000 Steven Knight
# This module is free software, and you may redistribute it and/or modify
# it under the same terms as Python itself, so long as this copyright message
# and disclaimer are retained in their original form.
#
# IN NO EVENT SHALL THE AUTHOR BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
# SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF
# THIS CODE, EVEN IF THE AUTHOR HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
# DAMAGE.
#
# THE AUTHOR SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
# PARTICULAR PURPOSE.  THE CODE PROVIDED HEREUNDER IS ON AN "AS IS" BASIS,
# AND THERE IS NO OBLIGATION WHATSOEVER TO PROVIDE MAINTENANCE,
# SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.

from string import join, split

__author__ = "Steven Knight <knight@baldmt.com>"
__revision__ = "TestCmd.py 0.D002 2001/08/31 14:56:12 software"
__version__ = "0.02"

from types import *

import os
import os.path
import popen2
import re
import shutil
import stat
import sys
import tempfile
import traceback

tempfile.template = 'testcmd.'

_Cleanup = []

def _clean():
    global _Cleanup
    list = _Cleanup[:]
    _Cleanup = []
    list.reverse()
    for test in list:
        test.cleanup()

sys.exitfunc = _clean

def _caller(tblist, skip):
    string = ""
    arr = []
    for file, line, name, text in tblist:
        if file[-10:] == "TestCmd.py":
                break
        arr = [(file, line, name, text)] + arr
    atfrom = "at"
    for file, line, name, text in arr[skip:]:
        if name == "?":
            name = ""
        else:
            name = " (" + name + ")"
        string = string + ("%s line %d of %s%s\n" % (atfrom, line, file, name))
        atfrom = "\tfrom"
    return string

def fail_test(self = None, condition = 1, function = None, skip = 0):
    """Cause the test to fail.

    By default, the fail_test() method reports that the test FAILED
    and exits with a status of 1.  If a condition argument is supplied,
    the test fails only if the condition is true.
    """
    if not condition:
        return
    if not function is None:
        function()
    of = ""
    desc = ""
    sep = " "
    if not self is None:
        if self.program:
            of = " of " + self.program
            sep = "\n\t"
        if self.description:
            desc = " [" + self.description + "]"
            sep = "\n\t"

    at = _caller(traceback.extract_stack(), skip)

    sys.stderr.write("FAILED test" + of + desc + sep + at)

    sys.exit(1)

def no_result(self = None, condition = 1, function = None, skip = 0):
    """Causes a test to exit with no valid result.

    By default, the no_result() method reports NO RESULT for the test
    and exits with a status of 2.  If a condition argument is supplied,
    the test fails only if the condition is true.
    """
    if not condition:
        return
    if not function is None:
        function()
    of = ""
    desc = ""
    sep = " "
    if not self is None:
        if self.program:
            of = " of " + self.program
            sep = "\n\t"
        if self.description:
            desc = " [" + self.description + "]"
            sep = "\n\t"

    at = _caller(traceback.extract_stack(), skip)
    sys.stderr.write("NO RESULT for test" + of + desc + sep + at)

    sys.exit(2)

def pass_test(self = None, condition = 1, function = None):
    """Causes a test to pass.

    By default, the pass_test() method reports PASSED for the test
    and exits with a status of 0.  If a condition argument is supplied,
    the test passes only if the condition is true.
    """
    if not condition:
        return
    if not function is None:
        function()
    sys.stderr.write("PASSED\n")
    sys.exit(0)

def match_exact(lines = None, matches = None):
    """
    """
    if not type(lines) is ListType:
        lines = split(lines, "\n")
    if not type(matches) is ListType:
        matches = split(matches, "\n")
    if len(lines) != len(matches):
        return
    for i in range(len(lines)):
        if lines[i] != matches[i]:
            return
    return 1

def match_re(lines = None, res = None):
    """
    """
    if not type(lines) is ListType:
        lines = split(lines, "\n")
    if not type(res) is ListType:
        res = split(res, "\n")
    if len(lines) != len(res):
        return
    for i in range(len(lines)):
        if not re.compile("^" + res[i] + "$").search(lines[i]):
            return
    return 1

class TestCmd:
    """Class TestCmd
    """

    def __init__(self, description = None,
                        program = None,
                        interpreter = None,
                        workdir = None,
                        subdir = None,
                        verbose = 0,
                        match = None):
        self._cwd = os.getcwd()
        self.description_set(description)
        self.program_set(program)
        self.interpreter_set(interpreter)
        self.verbose_set(verbose)
        if not match is None:
            self.match_func = match
        else:
            self.match_func = match_re
        self._dirlist = []
        self._preserve = {'pass_test': 0, 'fail_test': 0, 'no_result': 0}
        if os.environ.has_key('PRESERVE') and not os.environ['PRESERVE'] is '':
            self._preserve['pass_test'] = os.environ['PRESERVE']
            self._preserve['fail_test'] = os.environ['PRESERVE']
            self._preserve['no_result'] = os.environ['PRESERVE']
        else:
            try:
                self._preserve['pass_test'] = os.environ['PRESERVE_PASS']
            except KeyError:
                pass
            try:
                self._preserve['fail_test'] = os.environ['PRESERVE_FAIL']
            except KeyError:
                pass
            try:
                self._preserve['no_result'] = os.environ['PRESERVE_NO_RESULT']
            except KeyError:
                pass
        self._stdout = []
        self._stderr = []
        self.status = None
        self.condition = 'no_result'
        self.workdir_set(workdir)
        self.subdir(subdir)

    def __del__(self):
        self.cleanup()

    def __repr__(self):
        return "%x" % id(self)

    def cleanup(self, condition = None):
        """Removes any temporary working directories for the specified
        TestCmd environment.  If the environment variable PRESERVE was
        set when the TestCmd environment was created, temporary working
        directories are not removed.  If any of the environment variables
        PRESERVE_PASS, PRESERVE_FAIL, or PRESERVE_NO_RESULT were set
        when the TestCmd environment was created, then temporary working
        directories are not removed if the test passed, failed, or had
        no result, respectively.  Temporary working directories are also
        preserved for conditions specified via the preserve method.

        Typically, this method is not called directly, but is used when
        the script exits to clean up temporary working directories as
        appropriate for the exit status.
        """
        if not self._dirlist:
            return
        if condition is None:
            condition = self.condition
        if self._preserve[condition]:
            for dir in self._dirlist:
                print "Preserved directory", dir
        else:
            list = self._dirlist[:]
            list.reverse()
            for dir in list:
                self.writable(dir, 1)
                shutil.rmtree(dir, ignore_errors = 1)
                
        self._dirlist = []
        self.workdir = None
        os.chdir(self._cwd)            
        try:
            global _Cleanup
            _Cleanup.remove(self)
        except (AttributeError, ValueError):
            pass

    def description_set(self, description):
        """Set the description of the functionality being tested.
        """
        self.description = description

#    def diff(self):
#        """Diff two arrays.
#        """

    def fail_test(self, condition = 1, function = None, skip = 0):
        """Cause the test to fail.
        """
        if not condition:
            return
        self.condition = 'fail_test'
        fail_test(self = self,
                  condition = condition,
                  function = function,
                  skip = skip)

    def interpreter_set(self, interpreter):
        """Set the program to be used to interpret the program
        under test as a script.
        """
        self.interpreter = interpreter

    def match(self, lines, matches):
        """Compare actual and expected file contents.
        """
        return self.match_func(lines, matches)

    def match_exact(self, lines, matches):
        """Compare actual and expected file contents.
        """
        return match_exact(lines, matches)

    def match_re(self, lines, res):
        """Compare actual and expected file contents.
        """
        return match_re(lines, res)

    def no_result(self, condition = 1, function = None, skip = 0):
        """Report that the test could not be run.
        """
        if not condition:
            return
        self.condition = 'no_result'
        no_result(self = self,
                  condition = condition,
                  function = function,
                  skip = skip)

    def pass_test(self, condition = 1, function = None):
        """Cause the test to pass.
        """
        if not condition:
            return
        self.condition = 'pass_test'
        pass_test(self = self, condition = condition, function = function)

    def preserve(self, *conditions):
        """Arrange for the temporary working directories for the
        specified TestCmd environment to be preserved for one or more
        conditions.  If no conditions are specified, arranges for
        the temporary working directories to be preserved for all
        conditions.
        """
        if conditions is ():
            conditions = ('pass_test', 'fail_test', 'no_result')
        for cond in conditions:
            self._preserve[cond] = 1

    def program_set(self, program):
        """Set the executable program or script to be tested.
        """
        if program and not os.path.isabs(program):
            program = os.path.join(self._cwd, program)
        self.program = program

    def read(self, file, mode = 'rb'):
        """Reads and returns the contents of the specified file name.
        The file name may be a list, in which case the elements are
        concatenated with the os.path.join() method.  The file is
        assumed to be under the temporary working directory unless it
        is an absolute path name.  The I/O mode for the file may
        be specified; it must begin with an 'r'.  The default is
        'rb' (binary read).
        """
        if type(file) is ListType:
            file = apply(os.path.join, tuple(file))
        if not os.path.isabs(file):
            file = os.path.join(self.workdir, file)
        if mode[0] != 'r':
            raise ValueError, "mode must begin with 'r'"
        return open(file, mode).read()

    def run(self, program = None,
                  interpreter = None,
                  arguments = None,
                  chdir = None,
                  stdin = None):
        """Runs a test of the program or script for the test
        environment.  Standard output and error output are saved for
        future retrieval via the stdout() and stderr() methods.
        """
        if chdir:
            oldcwd = os.getcwd()
            if not os.path.isabs(chdir):
                chdir = os.path.join(self.workpath(chdir))
            if self.verbose:
                sys.stderr.write("chdir(" + chdir + ")\n")
            os.chdir(chdir)
        cmd = None
        if program:
            if not os.path.isabs(program):
                program = os.path.join(self._cwd, program)
            cmd = program
            if interpreter:
                cmd = interpreter + " " + cmd
        else:
            cmd = self.program
            if self.interpreter:
                cmd =  self.interpreter + " " + cmd
        if arguments:
            cmd = cmd + " " + arguments
        if self.verbose:
            sys.stderr.write(cmd + "\n")
        try:
            p = popen2.Popen3(cmd, 1)
        except AttributeError:
            (tochild, fromchild, childerr) = os.popen3(cmd)
            if stdin:
                if type(stdin) is ListType:
                    for line in stdin:
                        tochild.write(line)
                else:
                    tochild.write(stdin)
            tochild.close()
            self._stdout.append(fromchild.read())
            self._stderr.append(childerr.read())                
            fromchild.close()
            self.status = childerr.close()
            if not self.status:
                self.status = 0
        except:
            raise
        else:
            if stdin:
                if type(stdin) is ListType:
                    for line in stdin:
                        p.tochild.write(line)
                else:
                    p.tochild.write(stdin)
            p.tochild.close()
            self._stdout.append(p.fromchild.read())
            self._stderr.append(p.childerr.read())
            self.status = p.wait()
            
        if self.verbose:
            sys.stdout.write(self._stdout[-1])
            sys.stderr.write(self._stderr[-1])
            
        if chdir:
            os.chdir(oldcwd)

    def stderr(self, run = None):
        """Returns the error output from the specified run number.
        If there is no specified run number, then returns the error
        output of the last run.  If the run number is less than zero,
        then returns the error output from that many runs back from the
        current run.
        """
        if not run:
            run = len(self._stderr)
        elif run < 0:
            run = len(self._stderr) + run
        run = run - 1
        if (run < 0):
            return ''
        return self._stderr[run]

    def stdout(self, run = None):
        """Returns the standard output from the specified run number.
        If there is no specified run number, then returns the standard
        output of the last run.  If the run number is less than zero,
        then returns the standard output from that many runs back from
        the current run.
        """
        if not run:
            run = len(self._stdout)
        elif run < 0:
            run = len(self._stdout) + run
        run = run - 1
        if (run < 0):
            return ''
        return self._stdout[run]

    def subdir(self, *subdirs):
        """Create new subdirectories under the temporary working
        directory, one for each argument.  An argument may be a list,
        in which case the list elements are concatenated using the
        os.path.join() method.  Subdirectories multiple levels deep
        must be created using a separate argument for each level:

                test.subdir('sub', ['sub', 'dir'], ['sub', 'dir', 'ectory'])

        Returns the number of subdirectories actually created.
        """
        count = 0
        for sub in subdirs:
            if sub is None:
                continue
            if type(sub) is ListType:
                sub = apply(os.path.join, tuple(sub))
            new = os.path.join(self.workdir, sub)
            try:
                os.mkdir(new)
            except:
                pass
            else:
                count = count + 1
        return count

    def unlink (self, file):
        """Unlinks the specified file name.
        The file name may be a list, in which case the elements are
        concatenated with the os.path.join() method.  The file is
        assumed to be under the temporary working directory unless it
        is an absolute path name.
        """
        if type(file) is ListType:
            file = apply(os.path.join, tuple(file))
        if not os.path.isabs(file):
            file = os.path.join(self.workdir, file)
        os.unlink(file)


    def verbose_set(self, verbose):
        """Set the verbose level.
        """
        self.verbose = verbose

    def workdir_set(self, path):
        """Creates a temporary working directory with the specified
        path name.  If the path is a null string (''), a unique
        directory name is created.
        """
        if (path != None):
            if path == '':
                path = tempfile.mktemp()
            if path != None:
                os.mkdir(path)
            self._dirlist.append(path)
            global _Cleanup
            try:
                _Cleanup.index(self)
            except ValueError:
                _Cleanup.append(self)
            # We'd like to set self.workdir like this:
            #        self.workdir = path
            # But symlinks in the path will report things
            # differently from os.getcwd(), so chdir there
            # and back to fetch the canonical path.
            cwd = os.getcwd()
            os.chdir(path)
            self.workdir = os.getcwd()
            os.chdir(cwd)
        else:
            self.workdir = None

    def workpath(self, *args):
        """Returns the absolute path name to a subdirectory or file
        within the current temporary working directory.  Concatenates
        the temporary working directory name with the specified
        arguments using the os.path.join() method.
        """
        return apply(os.path.join, (self.workdir,) + tuple(args))

    def writable(self, top, write):
        """Make the specified directory tree writable (write == 1)
        or not (write == None).
        """

        def _walk_chmod(arg, dirname, names):
            st = os.stat(dirname)
            os.chmod(dirname, arg(st[stat.ST_MODE]))
            for name in names:
                n = os.path.join(dirname, name)
                st = os.stat(n)
                os.chmod(n, arg(st[stat.ST_MODE]))

        def _mode_writable(mode):
            return stat.S_IMODE(mode|0200)

        def _mode_non_writable(mode):
            return stat.S_IMODE(mode&~0200)

        if write:
            f = _mode_writable
        else:
            f = _mode_non_writable
        try:
            os.path.walk(top, _walk_chmod, f)
        except:
            pass # ignore any problems changing modes

    def write(self, file, content, mode = 'wb'):
        """Writes the specified content text (second argument) to the
        specified file name (first argument).  The file name may be
        a list, in which case the elements are concatenated with the
        os.path.join() method.        The file is created under the temporary
        working directory.  Any subdirectories in the path must already
        exist.  The I/O mode for the file may be specified; it must
        begin with a 'w'.  The default is 'wb' (binary write).
        """
        if type(file) is ListType:
            file = apply(os.path.join, tuple(file))
        if not os.path.isabs(file):
            file = os.path.join(self.workdir, file)
        if mode[0] != 'w':
            raise ValueError, "mode must begin with 'w'"
        open(file, mode).write(content)
