#!/usr/bin/env python

import boinc_path_config
from Boinc.assimilator import *
import os, sys, shutil

class PymwAssimilator(Assimilator):
    """
    PyMW Assimilator. Copies workunit results to a predefined output directory. 
    """
    
    def __init__(self):
        Assimilator.__init__(self)
        self.pymwDir = None

    def _copy_to_output(self, result, error_mask=0):
        # validate that the destination path still exists
        if not os.path.exists(self.pymwDir):
            self.logCritical("PyMW path does not exist or is inaccessible: %s\n", \
                            self.pymwDir)
            return
        
        resultFullPath = self.get_file_path(result)
        resultName = re.search('<open_name>(.*)</open_name>',result.xml_doc_in).group(1)

        # validate that the source path is accessible
        if not error_mask and not os.path.exists(resultFullPath):
            self.logCritical("Result path does not exist or is inaccessible: %s\n", \
                            resultFullPath)
            return
        
        # copy the file to the output directory where it
        # will be processed by PyMW
        try:
            dest = os.path.join(self.pymwDir, resultName)
            if error_mask:
                dest += ".error"
                f = open(dest, "w")
                try: f.writelines("BOINC error: " + error_mask)
                finally: f.close()
                self.logNormal("Error flag created [%s]\n", resultName)
            else:
                shutil.copy2(resultFullPath, dest)
                self.logNormal("Result copied [%s]\n", resultName)
        except Exception:
            self.logCritical("Error copying output\n" + \
                             "  - Source: %s\n" + \
                             "  - Dest: %s\n" + 
                             "  - Error: %s",
                             resultFullPath, dest, Exception)
    
    def assimilate_handler(self, wu, results, canonical_result):
        """
        Assimilates a canonical result by copying the result file
        to the PyMW pickup directory, self.pymwDir
        """
        
        # check for valid wu.canonical_result
        if wu.canonical_result:
            self.logNormal("[%s] Found canonical result\n", wu.name)
            self._copy_to_output(canonical_result, wu.error_mask)
        elif wu.error_mask != 0:
            # this is an error
            self.logNormal("[%s] Workunit failed, sending arbitrary result\n", wu.name)
            self._copy_to_output(results[0], wu.error_mask)
            self.logNormal("[%s] No canonical result\n", wu.name)
        else:
            self.logNormal("[%s] No canonical result\n", wu.name)

        # report errors with the workunit
        if self.report_errors(wu):
            pass    


    def parse_args(self, args):
        """
        This overridden version adds support for a PyMW destination directory.
        """
        
        # scan the args for the -pymw_dir switch
        # remove it when found so the base class doesn't complain
        # then call the base parse_args method
        
        newArgs = []
        args.reverse()
        found = False
        
        while len(args):
            arg = args.pop()
            if arg.strip() == '-pymw_dir':
                if len(args) == 0:
                    self.logCritical("Error, path switch found, but no path specified\n")
                    sys.exit(1)
                
                self.pymwDir = args.pop()
                if not os.path.exists(self.pymwDir):
                    self.logCritical("Path does not exist or is inaccessible: %s\n", \
                                    self.pymwDir)
                    sys.exit(1)
                else:
                    found = True
            else:
                newArgs.append(arg)
        
        if not found:
            self.logCritical("Error, path argument expected: -pymw_dir <PATH>\n")
            sys.exit(1)
        
        Assimilator.parse_args(self, newArgs)
        
# allow the module to be executed as an application
if __name__ == '__main__':
    asm = PymwAssimilator()
    asm.run()