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#!/usr/bin/env python
#
#   Library:    pyflowctrl
#   Module:     filereader2
#   Dependency:    core3
#   Examples:   
#
#

import os
from core3 import Stream, Process, EmptyStream
from core3 import WAITING, PROCESSING
from streams.stdiostreams1 import StandardErrorStream

class FileReader(Process):
    ''' file reader '''
    
    def __init__(self):
        super(FileReader, self).__init__()
        self.io = { 
            'input': Stream(data_type='path'),
            'output': Stream(data_type=('path', 'data')),
        }
            
    def main(self):
        while True:
            try:
                path = self.io['input'].get()
            except EmptyStream:
                yield WAITING
                continue
                
            if os.path.isfile(path):
                data = open(path, 'r').read()
                self.io['output'].put((path, data))
            yield PROCESSING