| #!/usr/bin/env python |
| |
| r""" |
| This module provides many valuable functions such as my_parm_file. |
| """ |
| |
| # sys and os are needed to get the program dir path and program name. |
| import sys |
| import errno |
| import os |
| import ConfigParser |
| import StringIO |
| import re |
| import socket |
| import tempfile |
| try: |
| import psutil |
| psutil_imported = True |
| except ImportError: |
| psutil_imported = False |
| |
| import gen_print as gp |
| import gen_cmd as gc |
| |
| robot_env = gp.robot_env |
| if robot_env: |
| from robot.libraries.BuiltIn import BuiltIn |
| |
| |
| def add_trailing_slash(dir_path): |
| r""" |
| Add a trailing slash to the directory path if it doesn't already have one |
| and return it. |
| |
| Description of arguments: |
| dir_path A directory path. |
| """ |
| |
| return os.path.normpath(dir_path) + os.path.sep |
| |
| |
| def which(file_path): |
| r""" |
| Find the full path of an executable file and return it. |
| |
| The PATH environment variable dictates the results of this function. |
| |
| Description of arguments: |
| file_path The relative file path (e.g. "my_file" or |
| "lib/my_file"). |
| """ |
| |
| shell_rc, out_buf = gc.cmd_fnc_u("which " + file_path, quiet=1, |
| print_output=0, show_err=0) |
| if shell_rc != 0: |
| error_message = "Failed to find complete path for file \"" +\ |
| file_path + "\".\n" |
| error_message += gp.sprint_var(shell_rc, 1) |
| error_message += out_buf |
| if robot_env: |
| BuiltIn().fail(gp.sprint_error(error_message)) |
| else: |
| gp.print_error_report(error_message) |
| return False |
| |
| file_path = out_buf.rstrip("\n") |
| |
| return file_path |
| |
| |
| def dft(value, default): |
| r""" |
| Return default if value is None. Otherwise, return value. |
| |
| This is really just shorthand as shown below. |
| |
| dft(value, default) |
| |
| vs |
| |
| default if value is None else value |
| |
| Description of arguments: |
| value The value to be returned. |
| default The default value to return if value is |
| None. |
| """ |
| |
| return default if value is None else value |
| |
| |
| def get_mod_global(var_name, |
| default=None, |
| mod_name="__main__"): |
| r""" |
| Get module global variable value and return it. |
| |
| If we are running in a robot environment, the behavior will default to |
| calling get_variable_value. |
| |
| Description of arguments: |
| var_name The name of the variable whose value is |
| sought. |
| default The value to return if the global does not |
| exist. |
| mod_name The name of the module containing the |
| global variable. |
| """ |
| |
| if robot_env: |
| return BuiltIn().get_variable_value("${" + var_name + "}", default) |
| |
| try: |
| module = sys.modules[mod_name] |
| except KeyError: |
| gp.print_error_report("Programmer error - The mod_name passed to" |
| + " this function is invalid:\n" |
| + gp.sprint_var(mod_name)) |
| raise ValueError('Programmer error.') |
| |
| if default is None: |
| return getattr(module, var_name) |
| else: |
| return getattr(module, var_name, default) |
| |
| |
| def global_default(var_value, |
| default=0): |
| r""" |
| If var_value is not None, return it. Otherwise, return the global |
| variable of the same name, if it exists. If not, return default. |
| |
| This is meant for use by functions needing help assigning dynamic default |
| values to their parms. Example: |
| |
| def func1(parm1=None): |
| |
| parm1 = global_default(parm1, 0) |
| |
| Description of arguments: |
| var_value The value being evaluated. |
| default The value to be returned if var_value is |
| None AND the global variable of the same |
| name does not exist. |
| """ |
| |
| var_name = gp.get_arg_name(0, 1, stack_frame_ix=2) |
| |
| return dft(var_value, get_mod_global(var_name, 0)) |
| |
| |
| def set_mod_global(var_value, |
| mod_name="__main__", |
| var_name=None): |
| r""" |
| Set a global variable for a given module. |
| |
| Description of arguments: |
| var_value The value to set in the variable. |
| mod_name The name of the module whose variable is |
| to be set. |
| var_name The name of the variable to set. This |
| defaults to the name of the variable used |
| for var_value when calling this function. |
| """ |
| |
| try: |
| module = sys.modules[mod_name] |
| except KeyError: |
| gp.print_error_report("Programmer error - The mod_name passed to" |
| + " this function is invalid:\n" |
| + gp.sprint_var(mod_name)) |
| raise ValueError('Programmer error.') |
| |
| if var_name is None: |
| var_name = gp.get_arg_name(None, 1, 2) |
| |
| setattr(module, var_name, var_value) |
| |
| |
| def my_parm_file(prop_file_path): |
| r""" |
| Read a properties file, put the keys/values into a dictionary and return |
| the dictionary. |
| |
| The properties file must have the following format: |
| var_name<= or :>var_value |
| Comment lines (those beginning with a "#") and blank lines are allowed and |
| will be ignored. Leading and trailing single or double quotes will be |
| stripped from the value. E.g. |
| var1="This one" |
| Quotes are stripped so the resulting value for var1 is: |
| This one |
| |
| Description of arguments: |
| prop_file_path The caller should pass the path to the |
| properties file. |
| """ |
| |
| # ConfigParser expects at least one section header in the file (or you |
| # get ConfigParser.MissingSectionHeaderError). Properties files don't |
| # need those so I'll write a dummy section header. |
| |
| string_file = StringIO.StringIO() |
| # Write the dummy section header to the string file. |
| string_file.write('[dummysection]\n') |
| # Write the entire contents of the properties file to the string file. |
| string_file.write(open(prop_file_path).read()) |
| # Rewind the string file. |
| string_file.seek(0, os.SEEK_SET) |
| |
| # Create the ConfigParser object. |
| config_parser = ConfigParser.ConfigParser() |
| # Make the property names case-sensitive. |
| config_parser.optionxform = str |
| # Read the properties from the string file. |
| config_parser.readfp(string_file) |
| # Return the properties as a dictionary. |
| return dict(config_parser.items('dummysection')) |
| |
| |
| def file_to_list(file_path, |
| newlines=0, |
| comments=1, |
| trim=0): |
| r""" |
| Return the contents of a file as a list. Each element of the resulting |
| list is one line from the file. |
| |
| Description of arguments: |
| file_path The path to the file (relative or |
| absolute). |
| newlines Include newlines from the file in the |
| results. |
| comments Include comment lines and blank lines in |
| the results. Comment lines are any that |
| begin with 0 or more spaces followed by |
| the pound sign ("#"). |
| trim Trim white space from the beginning and |
| end of each line. |
| """ |
| |
| lines = [] |
| file = open(file_path) |
| for line in file: |
| if not comments: |
| if re.match(r"[ ]*#|^$", line): |
| continue |
| if not newlines: |
| line = line.rstrip("\n") |
| if trim: |
| line = line.strip() |
| lines.append(line) |
| |
| return lines |
| |
| |
| def return_path_list(): |
| r""" |
| This function will split the PATH environment variable into a PATH_LIST |
| and return it. Each element in the list will be normalized and have a |
| trailing slash added. |
| """ |
| |
| PATH_LIST = os.environ['PATH'].split(":") |
| PATH_LIST = [os.path.normpath(path) + os.sep for path in PATH_LIST] |
| |
| return PATH_LIST |
| |
| |
| def escape_bash_quotes(buffer): |
| r""" |
| Escape quotes in string and return it. |
| |
| The escape style implemented will be for use on the bash command line. |
| |
| Example: |
| That's all. |
| |
| Result: |
| That'\''s all. |
| |
| The result may then be single quoted on a bash command. Example: |
| |
| echo 'That'\''s all.' |
| |
| Description of argument(s): |
| buffer The string whose quotes are to be escaped. |
| """ |
| |
| return re.sub("\'", "\'\\\'\'", buffer) |
| |
| |
| def quote_bash_parm(parm): |
| r""" |
| Return the bash command line parm with single quotes if they are needed. |
| |
| Description of arguments: |
| parm The string to be quoted. |
| """ |
| |
| # If any of these characters are found in the parm string, then the |
| # string should be quoted. This list is by no means complete and should |
| # be expanded as needed by the developer of this function. |
| bash_special_chars = set(' $') |
| |
| if any((char in bash_special_chars) for char in parm): |
| return "'" + parm + "'" |
| |
| return parm |
| |
| |
| def get_host_name_ip(host, |
| short_name=0): |
| r""" |
| Get the host name and the IP address for the given host and return them as |
| a tuple. |
| |
| Description of argument(s): |
| host The host name or IP address to be obtained. |
| short_name Include the short host name in the |
| returned tuple, i.e. return host, ip and |
| short_host. |
| """ |
| |
| host_name = socket.getfqdn(host) |
| try: |
| host_ip = socket.gethostbyname(host) |
| except socket.gaierror as my_gaierror: |
| message = "Unable to obtain the host name for the following host:" +\ |
| "\n" + gp.sprint_var(host) |
| gp.print_error_report(message) |
| raise my_gaierror |
| |
| if short_name: |
| host_short_name = host_name.split(".")[0] |
| return host_name, host_ip, host_short_name |
| else: |
| return host_name, host_ip |
| |
| |
| def pid_active(pid): |
| r""" |
| Return true if pid represents an active pid and false otherwise. |
| |
| Description of argument(s): |
| pid The pid whose status is being sought. |
| """ |
| |
| try: |
| os.kill(int(pid), 0) |
| except OSError as err: |
| if err.errno == errno.ESRCH: |
| # ESRCH == No such process |
| return False |
| elif err.errno == errno.EPERM: |
| # EPERM clearly means there's a process to deny access to |
| return True |
| else: |
| # According to "man 2 kill" possible error values are |
| # (EINVAL, EPERM, ESRCH) |
| raise |
| |
| return True |
| |
| |
| def to_signed(number, |
| bit_width=gp.bit_length(long(sys.maxsize)) + 1): |
| r""" |
| Convert number to a signed number and return the result. |
| |
| Examples: |
| |
| With the following code: |
| |
| var1 = 0xfffffffffffffff1 |
| print_var(var1) |
| print_var(var1, 1) |
| var1 = to_signed(var1) |
| print_var(var1) |
| print_var(var1, 1) |
| |
| The following is written to stdout: |
| var1: 18446744073709551601 |
| var1: 0x00000000fffffffffffffff1 |
| var1: -15 |
| var1: 0xfffffffffffffff1 |
| |
| The same code but with var1 set to 0x000000000000007f produces the |
| following: |
| var1: 127 |
| var1: 0x000000000000007f |
| var1: 127 |
| var1: 0x000000000000007f |
| |
| Description of argument(s): |
| number The number to be converted. |
| bit_width The number of bits that defines a complete |
| hex value. Typically, this would be a |
| multiple of 32. |
| """ |
| |
| if number < 0: |
| return number |
| neg_bit_mask = 2**(bit_width - 1) |
| if number & neg_bit_mask: |
| return ((2**bit_width) - number) * -1 |
| else: |
| return number |
| |
| |
| def get_child_pids(quiet=1): |
| |
| r""" |
| Get and return a list of pids representing all first-generation processes |
| that are the children of the current process. |
| |
| Example: |
| |
| children = get_child_pids() |
| print_var(children) |
| |
| Output: |
| children: |
| children[0]: 9123 |
| |
| Description of argument(s): |
| quiet Display output to stdout detailing how |
| this child pids are obtained. |
| """ |
| |
| if psutil_imported: |
| # If "import psutil" worked, find child pids using psutil. |
| current_process = psutil.Process() |
| return [x.pid for x in current_process.children(recursive=False)] |
| else: |
| # Otherwise, find child pids using shell commands. |
| print_output = not quiet |
| |
| ps_cmd_buf = "ps --no-headers --ppid " + str(os.getpid()) +\ |
| " -o pid,args" |
| # Route the output of ps to a temporary file for later grepping. |
| # Avoid using " | grep" in the ps command string because it creates |
| # yet another process which is of no interest to the caller. |
| temp = tempfile.NamedTemporaryFile() |
| temp_file_path = temp.name |
| gc.shell_cmd(ps_cmd_buf + " > " + temp_file_path, |
| print_output=print_output) |
| # Sample contents of the temporary file: |
| # 30703 sleep 2 |
| # 30795 /bin/bash -c ps --no-headers --ppid 30672 -o pid,args > |
| # /tmp/tmpqqorWY |
| # Use egrep to exclude the "ps" process itself from the results |
| # collected with the prior shell_cmd invocation. Only the other |
| # children are of interest to the caller. Use cut on the grep results |
| # to obtain only the pid column. |
| rc, output = \ |
| gc.shell_cmd("egrep -v '" + re.escape(ps_cmd_buf) + "' " |
| + temp_file_path + " | cut -c1-5", |
| print_output=print_output) |
| # Split the output buffer by line into a list. Strip each element of |
| # extra spaces and convert each element to an integer. |
| return map(int, map(str.strip, filter(None, output.split("\n")))) |