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@@ -1,95 +1,95 b'' | |||
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1 | 1 | import sys |
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2 | 2 | import time |
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3 | 3 | from io import StringIO |
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4 | 4 | |
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5 | 5 | from session import extract_header, Message |
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6 | 6 | |
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7 |
from IPython.utils import io, text |
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7 | from IPython.utils import io, text | |
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8 | 8 | from IPython.utils import py3compat |
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9 | 9 | |
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10 | 10 | #----------------------------------------------------------------------------- |
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11 | 11 | # Globals |
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12 | 12 | #----------------------------------------------------------------------------- |
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13 | 13 | |
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14 | 14 | #----------------------------------------------------------------------------- |
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15 | 15 | # Stream classes |
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16 | 16 | #----------------------------------------------------------------------------- |
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17 | 17 | |
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18 | 18 | class OutStream(object): |
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19 | 19 | """A file like object that publishes the stream to a 0MQ PUB socket.""" |
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20 | 20 | |
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21 | 21 | # The time interval between automatic flushes, in seconds. |
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22 | 22 | flush_interval = 0.05 |
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23 | 23 | topic=None |
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24 | 24 | |
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25 | 25 | def __init__(self, session, pub_socket, name): |
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26 | self.encoding = 'UTF-8' | |
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26 | 27 | self.session = session |
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27 | 28 | self.pub_socket = pub_socket |
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28 | 29 | self.name = name |
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29 | 30 | self.parent_header = {} |
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30 | 31 | self._new_buffer() |
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31 | 32 | |
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32 | 33 | def set_parent(self, parent): |
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33 | 34 | self.parent_header = extract_header(parent) |
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34 | 35 | |
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35 | 36 | def close(self): |
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36 | 37 | self.pub_socket = None |
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37 | 38 | |
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38 | 39 | def flush(self): |
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39 | 40 | #io.rprint('>>>flushing output buffer: %s<<<' % self.name) # dbg |
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40 | 41 | if self.pub_socket is None: |
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41 | 42 | raise ValueError(u'I/O operation on closed file') |
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42 | 43 | else: |
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43 | 44 | data = self._buffer.getvalue() |
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44 | 45 | if data: |
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45 | 46 | content = {u'name':self.name, u'data':data} |
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46 | 47 | msg = self.session.send(self.pub_socket, u'stream', content=content, |
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47 | 48 | parent=self.parent_header, ident=self.topic) |
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48 | 49 | |
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49 | 50 | if hasattr(self.pub_socket, 'flush'): |
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50 | 51 | # socket itself has flush (presumably ZMQStream) |
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51 | 52 | self.pub_socket.flush() |
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52 | 53 | self._buffer.close() |
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53 | 54 | self._new_buffer() |
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54 | 55 | |
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55 | 56 | def isatty(self): |
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56 | 57 | return False |
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57 | 58 | |
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58 | 59 | def __next__(self): |
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59 | 60 | raise IOError('Read not supported on a write only stream.') |
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60 | 61 | |
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61 | 62 | if not py3compat.PY3: |
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62 | 63 | next = __next__ |
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63 | 64 | |
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64 | 65 | def read(self, size=-1): |
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65 | 66 | raise IOError('Read not supported on a write only stream.') |
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66 | 67 | |
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67 | 68 | def readline(self, size=-1): |
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68 | 69 | raise IOError('Read not supported on a write only stream.') |
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69 | 70 | |
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70 | 71 | def write(self, string): |
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71 | 72 | if self.pub_socket is None: |
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72 | 73 | raise ValueError('I/O operation on closed file') |
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73 | 74 | else: |
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74 | 75 | # Make sure that we're handling unicode |
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75 | 76 | if not isinstance(string, unicode): |
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76 | enc = encoding.DEFAULT_ENCODING | |
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77 | string = string.decode(enc, 'replace') | |
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77 | string = string.decode(self.encoding, 'replace') | |
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78 | 78 | |
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79 | 79 | self._buffer.write(string) |
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80 | 80 | current_time = time.time() |
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81 | 81 | if self._start <= 0: |
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82 | 82 | self._start = current_time |
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83 | 83 | elif current_time - self._start > self.flush_interval: |
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84 | 84 | self.flush() |
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85 | 85 | |
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86 | 86 | def writelines(self, sequence): |
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87 | 87 | if self.pub_socket is None: |
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88 | 88 | raise ValueError('I/O operation on closed file') |
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89 | 89 | else: |
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90 | 90 | for string in sequence: |
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91 | 91 | self.write(string) |
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92 | 92 | |
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93 | 93 | def _new_buffer(self): |
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94 | 94 | self._buffer = StringIO() |
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95 | 95 | self._start = -1 |
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