def __init__( self,
launch_dir, api_args, cmd_files, interactive, piped_input, diagnostic, verbose ):
# Set passed in values and link to my Session Specification
self.launch_dir = launch_dir
self.api_args = api_args # These args are passed through to the API
self.spec = Session_Spec()
self.verbose = verbose # initial setting passed in from the command line
self.diagnostic = diagnostic # initial setting passed in from the command line
# Initialize the API
self.api = API( *api_args )
# Initialized UI specific (non-API) features
self.ui_cmd = {}
self.ui_alias = {}
self.exit_commands = ['q', 'quit', 'exit', 'ciao', 'bye']
self.init_ui_cmd()
# Initialize the DB session
self.editor = mi_RDB.db_Session()
# Special handling of stdio if a command file is piped in
if piped_input:
self.mode = "piped"
self.interact()
if not cmd_files and not interactive:
exit(0)
if interactive:
# Switch standard input to tty for interactive session
sys.stdin = open('/dev/tty', 'r')
if cmd_files:
self.mode = "batch"
self.process_command_files( cmd_files, interactive )
if not interactive:
self.editor.close()
exit(0)
# Start prompting for commands
self.mode = "interactive"
self.interact()
# User ended the command session, clean up and quit
self.editor.close()
def ui_refresh( self, arg_map=None ):
"""
Re-reads the API.
"""
self.api = API( *self.api_args )
class Session:
"""
Session
All user interaction occurs in the context of a Session.
"""
def __init__( self,
launch_dir, api_args, cmd_files, interactive, piped_input, diagnostic, verbose ):
# Set passed in values and link to my Session Specification
self.launch_dir = launch_dir
self.api_args = api_args # These args are passed through to the API
self.spec = Session_Spec()
self.verbose = verbose # initial setting passed in from the command line
self.diagnostic = diagnostic # initial setting passed in from the command line
# Initialize the API
self.api = API( *api_args )
# Initialized UI specific (non-API) features
self.ui_cmd = {}
self.ui_alias = {}
self.exit_commands = ['q', 'quit', 'exit', 'ciao', 'bye']
self.init_ui_cmd()
# Initialize the DB session
self.editor = mi_RDB.db_Session()
# Special handling of stdio if a command file is piped in
if piped_input:
self.mode = "piped"
self.interact()
if not cmd_files and not interactive:
exit(0)
if interactive:
# Switch standard input to tty for interactive session
sys.stdin = open('/dev/tty', 'r')
if cmd_files:
self.mode = "batch"
self.process_command_files( cmd_files, interactive )
if not interactive:
self.editor.close()
exit(0)
# Start prompting for commands
self.mode = "interactive"
self.interact()
# User ended the command session, clean up and quit
self.editor.close()
def extract_arg_item( self, arg_text ):
"""
Extracts the leftmost argument name - value pair from the supplied text
and returns the end char position of the matched text.
"""
for f, p in self.spec.arg_extract: # function, pattern
r = p.match( arg_text ) # Matches leftmost arg-value pair, if any
if r:
# Apply the extraction function for this pattern
a, v, match_end, pattern = f( r )
# Chop off what we just extracted on the left
arg_text = None if match_end >= len( arg_text ) - 1 \
else arg_text[match_end:].lstrip()
return a, v, pattern, arg_text
# No pattern matched
raise mi_Syntax_Error( "<op> <subject> [<args>]" )
def parse_app_args( self, arg_text ):
"""
Simple version of parse_ui_args which does no validation. It simply
produces the arg_map which can be later validated by the api.
"""
# Later we will fuse both parse_ui/app_args functions
# but they are separate now for tesing/experimentation
arg_map = {} # the parsed data goes here
# No need to parse the arg text if there is a ? in it anywhere
# as we will just print the complete list of required args
if "?" in arg_text:
arg_map["help"] = True # Detected when building the API command
return arg_map
# line is unparsed portion of arg_text
# strip it and remove any internal single or double quotes
arg_text = arg_text.strip().replace("'","").replace('"',"")
match_end = 0 # total length of matched groups for line chopping
while arg_text:
a, v, pattern, arg_text = self.extract_arg_item( arg_text )
arg_map[a] = v
# pattern not used for app args
return arg_map
def parse_ui_args( self, op, arg_text ):
"""
Parses the args portion of a single text command line to produce an arg_map.
This is a dictionary of arg:value and switch:True pairs. The arg_map can be
later supplied to the op's designated implementation function.
"""
arg_map = {} # the parsed data goes here
arg_text = arg_text.strip() # line is unparsed portion of arg_text
fset = set() # For grouping comparison
# Build the arg map
match_end = 0 # total length of matched groups for line chopping
while arg_text:
a, v, pattern, arg_text = self.extract_arg_item( arg_text )
if pattern == 'value': # matches arg value pattern, ex: -s domain
# validate( a ) # validate_uiarg(a) or validate_apparg(a)
if a not in self.ui_cmd[op]['syntax']:
# Arg not defined for this op
raise mi_Syntax_Error( self.ui_cmd[op]['help'] )
if self.ui_cmd[op]['syntax'][a]['action'] != 'store':
# Arg does not take a value for this op
raise mi_Syntax_Error( self.ui_cmd[op]['help'] )
elif pattern == 'flag': # matches flat pattern, ex: -f
if a not in self.ui_cmd[op]['syntax']:
# Arg not defined for this op
raise mi_Syntax_Error( self.ui_cmd[op]['help'] )
arg_spec = self.ui_cmd[op]['syntax'][a] # for brevity
if arg_spec['action'] == 'store':
try:
v = arg_spec['default']
except KeyError:
# Value should have been specified since there was no default
raise mi_Syntax_Error( self.ui_cmd[op]['help'] )
elif arg_spec['action'] == 'switch':
v = True
else: # action must be 'store' or 'switch', fatal error
raise mi_Error( 'No action defined for flag: ' + a )
else:
# A regex was matched, but it's not valid for a ui command
# For example, a comma separated list is not an acceptable ui arg
raise mi_Syntax_Error( self.ui_cmd[op]['help'] )
# Add arg_map entry a, v, will overwrite any duplicate
arg_map[ self.ui_cmd[op]['syntax'][a]['var'] ] = v.strip() if v else None
# Update group
fset.add(a)
# Ensure that each required flag has been provided
# and has a value. Switches will always carry a True value.
for flag in self.ui_cmd[op]['syntax']:
if 'required' not in self.ui_cmd[op]['syntax'][flag]:
continue # Don't worry about optional flags
if self.ui_cmd[op]['syntax'][flag]['var'] not in arg_map:
raise mi_Syntax_Error( self.ui_cmd[op]['help'] )
# Enforce grouping rules
if not arg_map and not self.ui_cmd[op].get('grouping'):
# No groups and no args
return arg_map
group_found = False
# Find
for group in self.ui_cmd[op]['grouping']:
if fset == set(group): # Order doesn't matter, so we use sets
group_found = True
break
if not group_found:
# There is no legal grouping that corresponds to what we parsed
raise mi_Syntax_Error( self.ui_cmd[op]['help'] )
return arg_map
# <<< UI Command Functions
def ui_refresh( self, arg_map=None ):
"""
Re-reads the API.
"""
self.api = API( *self.api_args )
def ui_help( self, arg_map=None ):
"""
Prints command line help
"""
if not arg_map:
# Print everything, starting with UI commands
print()
print("UI Commands")
print("---")
print()
for u in self.ui_cmd:
print( self.ui_cmd[u]['help'] )
print()
print( "Exit with: [ " + " | ".join(self.exit_commands) + " ]" )
# Print all app commands
self.api.show_help( arg_map )
# Print guide to more detailed help
print( "Type a partial command with a question mark for help on a particular item." )
print (" example: help new attr ?" )
print()
def ui_toggle_verbose( self, arg_map ):
"""
Toggles verbose mode where API calls are printed before being invoked.
"""
self.verbose = not( self.verbose )
print( "Verbose mode {}".format( "ON" if self.verbose else "OFF") )
def ui_toggle_diagnostic( self, arg_map ):
"""
Toggles diagnostic mode where API calls are printed, but not invoked.
"""
self.diagnostic = not( self.diagnostic )
print( "Diagnostic mode {}".format( "ON" if self.diagnostic else "OFF") )
def ui_focus( self, arg_map ):
"""
Sets or clears a focus attribute, or clears all focus attributes.
"""
if 'subject_to_clear' in arg_map:
# Can't use get() since value might be None
# Either clear all defaults or the specified subject
self.api.clear_default( arg_map['subject_to_clear'] )
return
if not arg_map.get('subject'):
# Return all default values (if any have been set)
for s, v in self.api.get_all_defaults():
print('{} : {}'.format(s, v))
return
# A subject has been specified
if arg_map.get('value'):
# Set the subject's default to provided value
s, v = self.api.set_default( arg_map['subject'], arg_map['value'] )
return
# Subject, but no value specified, so return the subject's current default value or None
s, v = self.api.get_default_for_subject( arg_map['subject'])
print( '{} : {}'.format(s, v) )
def ui_process_cmd_file( self, arg_map ):
"""
Reads and processes a single command file during an interactive
session.
"""
cmd_file = arg_map['file'] if os.path.isabs(arg_map['file']) else \
os.path.join( self.launch_dir, arg_map['file'] )
try:
cf = open( cmd_file )
except IOError:
mi_File_Error("Could not open", cmd_file )
return
print()
print("Reading file: " + cmd_file )
print ()
self.mode = "file"
for command in cf:
command = strip_comment_ws( command )
if not command:
continue
print( "* " + command )
try:
self.process( command )
except mi_Quiet_Error:
print()
print( "Aborted file: " + cmd_file )
print()
return # to interactive session
finally:
self.mode = "interactive"
print()
print( "End of file: " + cmd_file )
print()
def init_ui_cmd( self ):
"""
Build up a list of recognized UI commands with required args.
"""
self.ui_cmd['read'] = {
'func':Session.ui_process_cmd_file,
'syntax':{
'f':{'action':'store', 'var':'file'},
},
'grouping':( ('f') ),
'help':""
}
self.ui_cmd['diagnostic'] = {
'func':Session.ui_toggle_diagnostic,
'syntax':{},
'grouping':( () ),
'help':""
}
self.ui_cmd['verbose'] = {
'func':Session.ui_toggle_verbose,
'syntax':{},
'grouping':( () ),
'help':""
}
self.ui_cmd['refresh'] = {
'func':Session.ui_refresh,
'syntax':{},
'grouping':( () ),
'help':""
}
self.ui_cmd['focus'] = { # name of op
'func':Session.ui_focus, # Session function that implements op
'syntax':{ # flag specs
# action: store or switch, var: name of stored value
# 'required' means flag is required, otherwise flag is optional
# default:value means user can omit a value
# No value is provided with a switch action example:
# 'f':{'action':'switch', 'var':'force'},
's':{'action':'store', 'var':'subject'},
'v':{'action':'store', 'var':'value'},
'c':{'action':'store', 'var':'subject_to_clear', 'default':None}
},
# possible flag groupings on command line
# () means that a command with no args is okay
'grouping':( (), ('c'), ('s'), ('s', 'v') ),
'help':"" # generated below
}
self.ui_cmd['h'] = {
'func':Session.ui_help,
'syntax':{},
# 's':{'action':'store', 'var':'subject'},
# 'op':{'action':'store', 'var':'op'}
# },
'grouping':( () ),
'help':""
}
self.ui_alias = {
'h': 'h', 'help' : 'h',
'focus' : 'focus', 'f' : 'focus',
'r':'refresh', 'refresh':'refresh',
'read':'read', 'run':'read',
'diagnostic':'diagnostic', 'd':'diagnostic',
'verbose':'verbose', 'v':'verbose'
}
# Create help syntax dictionary with entry for each command
for op in self.ui_cmd:
args_optional = False
group_strings = [] # Help string for each grouping
for grouping in self.ui_cmd[op]['grouping']:
if not grouping: # Empty grouping means 'no args' is okay
args_optional = True
continue
gstr = "" # Help string for this group
for flag in grouping:
fstr = "" # Help string for this flag
flag_spec = self.ui_cmd[op]['syntax'][flag] # for brevity
# Add flag syntax to help string
if flag_spec['action'] == 'store':
if 'default' in flag_spec:
# stores a default value -f [value]
fstr += "-{} [{}] ".format( flag, flag_spec['var'] )
else:
# stores a required value -f value
fstr += "-{} {} ".format( flag, flag_spec['var'] )
elif flag_spec['action'] == 'switch':
# no value
fstr += "-{}".format( flag )
# Append to group string
gstr += fstr
# Add the flag help to the current group
if gstr:
group_strings.append( gstr )
# Join all the groups together with 'or' delimiter
arg_help = ' | '.join(group_strings)
# Wrap all args in 'optional' [] braces if the op may be used without args
#if 'required' not in [f for f in self.ui_cmd[op]['syntax']]:
if args_optional:
arg_help = " [ " + arg_help + " ]"
self.ui_cmd[op]['help'] = op + " " + arg_help
def process_command_files( self, cmd_files, interactive ):
"""
Process each command (line) from each command file. Exits if any command
fails unless interactive mode has been requested.
"""
for cmd_fname in cmd_files:
print()
print("Reading file: " + cmd_fname )
print()
try:
cf = open( cmd_fname )
except:
mi_File_Error("Could not open", cmd_fname )
for command in cf:
command = strip_comment_ws( command )
if not command:
continue
print( "* " + command )
try:
self.process( command )
except:
# If a command fails, no point in reading the rest of the file
# since the error will likely cascade. Stop processing files.
print()
print( "Aborted file: " + cmd_fname )
print()
if not interactive:
exit(1)
return # Will enter an interactive session
print()
print( "End of file: " + cmd_fname )
print()
def interact( self ):
"""
Interactive command loop. Repeatedly prompts for a raw line of input.
"""
if self.mode == "piped":
print()
print("--- Processing commands from input pipe ---")
print()
else:
# Print start of session message
print()
print( self.spec.title + " " + "Version: " + self.spec.version )
print()
print( "Developer: " + self.spec.developer + " / " + self.spec.copyright )
print( self.spec.license )
print()
print ("? <subject> to get valid operations, ex: ? domain")
print ("<op> <subject> without any args to get required args, ex: new domain")
print( "h, help for help and q to quit" )
print()
# Prompt for commands and process them until a quit command is detected
while True:
line = None
while not line: # ignore blank lines
try:
if self.mode == "interactive":
line = input( self.spec.prompt )
else:
line = input()
line = None if line.startswith( COMMENT_CHAR ) else line
except EOFError:
# We'll get this when processing an input stream
if self.mode == "piped":
print()
print("--- Finished processing input pipe ---")
print()
return
else:
print("Ctrl-D detected.")
print("Bye.")
print()
break
if line in self.exit_commands:
print("Bye.")
print()
break
if self.mode != "interactive":
print( "* " + line.strip() )
try:
self.process( line )
except mi_Command_Error:
# Error message has been printed, continue to next prompt
continue
def process( self, line ):
"""
Process line
"""
# Initially assume it is a UI command with two parts <UIOP> <UIARGS>
term = line.split( None, 1 )
# Is this a valid UI command?
if term[UIOP] in self.ui_alias:
# replace alias with official ui command
term[UIOP] = self.ui_alias[term[UIOP]]
# Split off the arg portion of the command line
arg_text = "" if len(term) < 2 else term[UIARGS]
# Parse the args
arg_map = self.parse_ui_args( term[UIOP], arg_text )
# Execute the UI command
self.ui_cmd[term[UIOP]]['func']( self, arg_map )
return
# Assert: Not a UI command, possibly a legal App command
# Break the line into 1-3 parts, <op> <subject> <args>
term = line.split( None, 2 )
if len(term) < 2: # We need at least an op and a subject
raise mi_Syntax_Error( "<op> <subject> [arg, ...]" )
if self.mode in {'batch', 'file'}:
raise mi_Quiet_Error()
return
if len(term) == 2:
term.append( "" ) # to avoid index error later
# Assert term is a list of three elements OP, SUB, ARGS
arg_map = self.parse_app_args( term[ARGS] )
command = self.api.command_to_call( term[SUB], term[OP], arg_map )
try:
relations, attrs = self.editor.exec_command(
command['call'], command['pvals'], command['ovals'],
self.diagnostic, self.verbose
)
except mi_DB_Error:
if self.mode in {'batch', 'file'}:
raise mi_Quiet_Error()
return # Non-fatal error was printed
if attrs: # Any expected return value?
print("<----")
hlen = 0
for a in attrs:
print(a, end="\t")
hlen += len(a) + 3
else:
print()
print("="*hlen)
for r in relations:
print(r)
else:
print("="*hlen)
