source: tester/tester.py @ 1103

import os, os.path, sys, platform, re, copy
import traceback # for custom printing of exception trace/stack
import errno  # for delete_file_if_present()
import argparse
from subprocess import Popen, PIPE
from time import sleep
import telnetlib

# detecting CYGWIN with anaconda windows python is tricky, as all standard methods consider they are running under Windows/win32/nt.
# Consequently, os.linesep is set incorrectly to '\r\n', so we resort to environment variable to fix this. Note that this would
# likely give incorrect results for python installed under cygwin, so if ever needed, we should diffrentiate these two situations.
#print(platform.system())
#print(sys.platform)
#for a,b in os.environ.items(): #prints all environment variables...
#       if 'cyg' in a or 'cyg' in b: #...that contain 'cyg' and therefore may be useful for detecting that we are running under cygwin
#               print(a,b)
CYGWIN='HOME' in os.environ and 'cygwin' in os.environ['HOME']
if CYGWIN:
        os.linesep='\n' #fix wrong value (suitable for Windows)


import comparison  # our source
import globals  # our source




def test(args, test_name, input, output_net, output_msg, exe_prog, exeargs):
        print(test_name, end=" ")
        command = prepare_exe_with_name(exe_prog)
        command += exeargs
        if len(output_net) > 0:
                command += globals.EXENETMODE
        if args.valgrind:
                command = globals.EXEVALGRINDMODE + command

        p = Popen(command, stdout=PIPE, stderr=PIPE, stdin=PIPE)

        if len(output_net) > 0:
                sleep(10 if args.valgrind else 1)  # time for the server to warm up
                tn = telnetlib.Telnet("localhost", 9009)
                tn.write(bytes(input, "UTF-8"))
                sleep(2)  # time for the server to respond...
                # if we had a command in the frams server protocol to close the connection gracefully, then we could use read_all() instead of the trick with sleep()+read_very_eager()+close()
                stdnet = tn.read_very_eager().decode().split("\n")  # the server uses "\n" as the end-of-line character on each platform
                tn.close()  # after this, the server is supposed to close by itself (the -N option)
                input = ""
        # under Windows, p.stderr.read() and p.stdout.read() block while the process works, under linux it may be different
        # http://stackoverflow.com/questions/3076542/how-can-i-read-all-availably-data-from-subprocess-popen-stdout-non-blocking?rq=1
        # http://stackoverflow.com/questions/375427/non-blocking-read-on-a-subprocess-pipe-in-python
        # p.terminate() #this was required when the server did not have the -N option
        # stderrdata=p.stderr.read() #fortunately it is possible to reclaim (a part of?) stream contents after the process is killed... under Windows this is the ending of the stream

        (stdoutdata, stderrdata) = p.communicate(bytes(input, "UTF-8"))  # the server process ends...
        stdoutdata = stdoutdata.decode()  # bytes to str
        stderrdata = stderrdata.decode()  # bytes to str
        # p.stdin.write(we) #this is not recommended because buffers can overflow and the process will hang up (and indeed it does under Windows) - so communicate() is recommended
        # stdout = p.stdout.read()
        # p.terminate()

        # print repr(input)
        # print repr(stdoutdata)

        stdout = stdoutdata.split(os.linesep)
        # print stdout
        stderr = stderrdata.split(os.linesep)
        ok = check(stdnet if len(output_net) > 0 else stdout, output_list if len(output_list) > 0 else output_net, output_msg)

        if p.returncode != 0 and p.returncode is not None:
                print("  ", p.returncode, "<- returned code")

        if len(stderrdata) > 0:
                print("   (stderr has %d lines)" % len(stderr))
                # valgrind examples:
                # ==2176== ERROR SUMMARY: 597 errors from 50 contexts (suppressed: 35 from 8)
                # ==3488== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 35 from 8)
                if (not args.valgrind) or ("ERROR SUMMARY:" in stderrdata and " 0 errors" not in stderrdata) or (args.always_show_stderr):
                        print(stderrdata)

        if not ok and args.stop:
                sys.exit("First test failure, stopping early.")
        return ok


def compare(jest, goal, was_compared_to):
        compare = comparison.Comparison(jest, goal)
        if compare.equal:
                print("\r", globals.ANSI_SETGREEN + " ok" + globals.ANSI_RESET)
        else:
                print("\r", globals.ANSI_SETRED + " FAIL\7" + globals.ANSI_RESET)
                try:
                        print(compare.result)
                except UnicodeEncodeError:
                        print(compare.result.encode("utf-8")) #only encode as utf8 when it is actually used, but this looks incorrect and perhaps should not be needed if the console supports utf8?
                        #sys.stdout.buffer.write(compare.result.encode("utf-8")) #prints nothing (on cygwin)
                failed_result_filename = compare.list2_file + was_compared_to
                if failed_result_filename == '':
                        failed_result_filename = '_test'
                f = open(os.path.join(globals.THISDIR, failed_result_filename + '.Failed-output'), 'w',  encoding='utf8')  # files are easier to compare than stdout
                print('\n'.join(jest)+'\n', end="", file=f) # not sure why one last empty line is always lost (or one too much is expected?), adding here...
                f = open(os.path.join(globals.THISDIR, failed_result_filename + '.Failed-goal'), 'w',  encoding='utf8')  # files are easier to compare than stdout
                print('\n'.join(goal), end="", file=f)
        return compare.equal


def remove_prefix(text, prefix):
        return text[len(prefix):] if text.startswith(prefix) else text


def check(stdout, output_net, output_msg):
        actual_out_msg = []
        if len(output_net) > 0:  # in case of the server, there is no filtering
                for line in stdout:
                        actual_out_msg.append(line)
                return compare(actual_out_msg, output_net, '')
        else:
                FROMSCRIPT = "Script.Message: "
                beginnings = tuple(["[" + v + "] " for v in ("INFO", "WARN", "ERROR", "CRITICAL")])  # there is also "DEBUG"
                header_begin = 'VMNeuronManager.autoload: Neuro classes added: '  # header section printed when the simulator is created
                header_end = "UserScripts.autoload: "  # ending of the header section
                now_in_header = False
                for line in stdout:
                        if now_in_header:
                                if header_end in line:  # "in" because multithreaded simulators prefix their messages with their numerical id, e.g. #12/...
                                        now_in_header = False
                                continue
                        else:
                                if header_begin in line:  # as above
                                        now_in_header = True
                                        continue
                                line = remove_prefix(line, beginnings[0])  # cut out [INFO], other prefixes we want to leave as they are
                                line = remove_prefix(line, FROMSCRIPT)  # cut out FROMSCRIPT
                                actual_out_msg.append(line)
                if actual_out_msg[-1] == '':  # empty line at the end which is not present in our "goal" contents
                        actual_out_msg.pop()
                return compare(actual_out_msg, output_msg, '')


def delete_file_if_present(filename):
        print('"%s" (%s)' % (filename, "the file was present" if os.path.exists(filename) else "this file did not exist"))
        try:
                os.remove(filename)
        except OSError as e:
                if e.errno != errno.ENOENT:  # errno.ENOENT = no such file or directory
                        raise  # re-raise exception if a different error occurred


def reset_values():
        global input_text, output_net, output_msg, test_name, ini, output_list, exeargs, exe_prog
        input_text = ""
        output_list = []
        ini = ""
        output_net, output_msg = [], []
        exeargs = []
        test_name = "no-name test"


def is_test_active():
        global test_name
        if name_template == "":
                return True
        if re.match(name_template, test_name):
                return True
        return False


def prepare_exe_with_name(name):
        if name in globals.EXENAMES:
                exename = copy.copy(globals.EXENAMES[name])  # without copy, the following modifications would change values in the EXENAMES table
        else:
                exename = [name]
        for rule in globals.EXERULES:
                exename[0] = re.sub(rule[0], rule[1], exename[0])
        if CYGWIN: #somehow for anaconda under cygwin, re.sub() works incorrectly and 'anyname' with rule ('(.*)', '../\\1') yields '../anyname../'
                exename=['../'+name]
        return exename


def print_exception(exc):
        print("\n"+("-"*60),'begin exception')
        print(exc) # some exceptions have an empty traceback, they only provide one-line exception name
        traceback.print_exc()
        print("-"*60,'end exception')


def main():
        global input_text, name_template, test_name, exe_prog, exeargs
        name_template = ""
        exeargs = []

        parser = argparse.ArgumentParser()
        parser.add_argument("-val", "--valgrind", help="Use valgrind", action="store_true")
        parser.add_argument("-c", "--nocolor", help="Don't use color output", action="store_true")
        parser.add_argument("-f", "--file", help="File name with tests", required=True)
        parser.add_argument("-tp", "--tests-path", help="tests directory, files containing test definitions, inputs and outputs are relative to this directory, default is '" + globals.THISDIR + "'")
        parser.add_argument("-fp", "--files-path", help="files directory, files tested by OUTFILECOMPARE are referenced relative to this directory, default is '" + globals.FILESDIR + "'")
        parser.add_argument("-wp", "--working-path", help="working directory, test executables are launched after chdir to this directory, default is '" + globals.EXEDIR + "'")
        parser.add_argument("-n", "--name", help="Test name (regexp)")  # e.g. '^((?!python).)*$' = these tests which don't have the word "python" in their name
        parser.add_argument("-s", "--stop", help="Stops on first difference", action="store_true")
        parser.add_argument("-ds", "--diffslashes", help="Discriminate between slashes (consider / and \\ different)", action="store_true")
        parser.add_argument("-err", "--always-show-stderr", help="Always print stderr (by default it is hidden if 0 errors in valgrind)", action="store_true")
        parser.add_argument("-e", "--exe", help="Regexp 'search=replace' rule(s) transforming executable name(s) into paths (eg. '(.*)=path/to/\\1.exe')", action='append')  # in the example, double backslash is just for printing
        parser.add_argument("-p", "--platform", help="Override platform identifier (referencing platform specific files " + globals.SPEC_INSERTPLATFORMDEPENDENTFILE + "), default:sys.platform (win32,linux2)")
        args = parser.parse_args()
        if args.valgrind:
                print("Using valgrind...")
        if args.diffslashes:
                globals.DIFFSLASHES = args.diffslashes
        if args.file:
                main_test_filename = args.file
        if args.tests_path:
                globals.THISDIR = args.tests_path
        if args.files_path:
                globals.FILESDIR = args.files_path
        if args.working_path:
                globals.EXEDIR = args.working_path
        if args.name:
                name_template = args.name
        if args.exe:
                for e in args.exe:
                        search, replace = e.split('=', 1)
                        globals.EXERULES.append((search, replace))
        if args.platform:
                globals.PLATFORM = args.platform

        os.chdir(globals.EXEDIR)

        globals.init_colors(args)

        fin = open(os.path.join(globals.THISDIR, args.file), encoding='utf8')
        reset_values()
        exe_prog = "default"  # no longer in reset_values (exe: persists across tests)
        outfile = []
        tests_failed = 0
        tests_total = 0
        dotOK = ""
        for line in fin:
                line = globals.stripEOL(line)
                if len(line) == 0 or line.startswith("#"):
                        continue
                line = line.split(":", 1)
                # print line
                command = line[0]
                if command == "TESTNAME":
                        reset_values()
                        test_name = line[1]
                elif command == "arg":
                        exeargs.append(line[1])
                elif command == "exe":
                        exe_prog = line[1]
                elif command == "in":
                        input_text += line[1] + "\n"
                elif command == "out-net":
                        output_net.append(line[1])
                elif command == "out-file":
                        outfile.append(line[1])
                elif command == "out-mesg":
                        output_msg.append(line[1])
                elif command == "out":
                        output_list.append(line[1])
                elif command == "DELETEFILENOW":
                        if is_test_active():
                                print("\t ", command, end=" ")
                                delete_file_if_present(os.path.join(globals.FILESDIR, line[1]))
                elif command == "OUTFILECLEAR":
                        outfile = []
                elif command == "OUTFILECOMPARE":
                        if is_test_active():
                                print("\t", command, '"%s"' % line[1], end=" ")
                                try:
                                        contents = []
                                        with open(os.path.join(globals.FILESDIR, line[1]), 'r', encoding='utf8') as main_test_filename:
                                                for line in main_test_filename:
                                                        contents.append(globals.stripEOL(line))
                                        ok = compare(contents, outfile, '_file') # +line[1]
                                except Exception as e: # could also 'raise' for some types of exceptions if we wanted
                                        print_exception(e)
                                        ok = 0
                                tests_failed += int(not ok)
                                tests_total += 1
                                dotOK += '.' if ok else test_name[0] if len(test_name)>0 else '?'
                elif command == "RUNTEST":
                        if is_test_active():
                                print("\t", command, end=" ")
                                try:
                                        ok = test(args, test_name, input_text, output_net, output_msg, exe_prog, exeargs)
                                except Exception as e: # could also 'raise' for some types of exceptions if we wanted
                                        print_exception(e)
                                        ok = 0
                                tests_failed += int(not ok)
                                tests_total += 1
                                dotOK += '.' if ok else test_name[0] if len(test_name)>0 else '?'
                else:
                        raise Exception("Don't know what to do with this line in test file: ", line)

        return (tests_failed, tests_total, dotOK)


if __name__ == "__main__":
        tests_failed, tests_total, dotOK = main()
        print("TestsDotOK:%s(%d)" % (dotOK, tests_failed));
        print("%d / %d failed tests" % (tests_failed, tests_total))
        sys.exit(tests_failed)  # return the number of failed tests as exit code ("error level") to shell