Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/requests_toolbelt/streaming_iterator.py @ 0:4f3585e2f14b draft default tip
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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1 # -*- coding: utf-8 -*- |
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2 """ |
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3 |
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4 requests_toolbelt.streaming_iterator |
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5 ==================================== |
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6 |
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7 This holds the implementation details for the :class:`StreamingIterator`. It |
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8 is designed for the case where you, the user, know the size of the upload but |
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9 need to provide the data as an iterator. This class will allow you to specify |
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10 the size and stream the data without using a chunked transfer-encoding. |
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11 |
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12 """ |
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13 from requests.utils import super_len |
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14 |
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15 from .multipart.encoder import CustomBytesIO, encode_with |
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16 |
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17 |
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18 class StreamingIterator(object): |
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19 |
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20 """ |
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21 This class provides a way of allowing iterators with a known size to be |
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22 streamed instead of chunked. |
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23 |
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24 In requests, if you pass in an iterator it assumes you want to use |
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25 chunked transfer-encoding to upload the data, which not all servers |
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26 support well. Additionally, you may want to set the content-length |
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27 yourself to avoid this but that will not work. The only way to preempt |
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28 requests using a chunked transfer-encoding and forcing it to stream the |
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29 uploads is to mimic a very specific interace. Instead of having to know |
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30 these details you can instead just use this class. You simply provide the |
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31 size and iterator and pass the instance of StreamingIterator to requests |
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32 via the data parameter like so: |
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33 |
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34 .. code-block:: python |
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35 |
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36 from requests_toolbelt import StreamingIterator |
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37 |
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38 import requests |
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39 |
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40 # Let iterator be some generator that you already have and size be |
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41 # the size of the data produced by the iterator |
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42 |
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43 r = requests.post(url, data=StreamingIterator(size, iterator)) |
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44 |
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45 You can also pass file-like objects to :py:class:`StreamingIterator` in |
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46 case requests can't determize the filesize itself. This is the case with |
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47 streaming file objects like ``stdin`` or any sockets. Wrapping e.g. files |
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48 that are on disk with ``StreamingIterator`` is unnecessary, because |
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49 requests can determine the filesize itself. |
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50 |
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51 Naturally, you should also set the `Content-Type` of your upload |
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52 appropriately because the toolbelt will not attempt to guess that for you. |
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53 """ |
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54 |
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55 def __init__(self, size, iterator, encoding='utf-8'): |
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56 #: The expected size of the upload |
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57 self.size = int(size) |
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58 |
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59 if self.size < 0: |
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60 raise ValueError( |
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61 'The size of the upload must be a positive integer' |
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62 ) |
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63 |
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64 #: Attribute that requests will check to determine the length of the |
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65 #: body. See bug #80 for more details |
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66 self.len = self.size |
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67 |
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68 #: Encoding the input data is using |
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69 self.encoding = encoding |
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70 |
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71 #: The iterator used to generate the upload data |
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72 self.iterator = iterator |
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73 |
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74 if hasattr(iterator, 'read'): |
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75 self._file = iterator |
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76 else: |
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77 self._file = _IteratorAsBinaryFile(iterator, encoding) |
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78 |
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79 def read(self, size=-1): |
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80 return encode_with(self._file.read(size), self.encoding) |
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81 |
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82 |
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83 class _IteratorAsBinaryFile(object): |
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84 def __init__(self, iterator, encoding='utf-8'): |
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85 #: The iterator used to generate the upload data |
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86 self.iterator = iterator |
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87 |
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88 #: Encoding the iterator is using |
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89 self.encoding = encoding |
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90 |
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91 # The buffer we use to provide the correct number of bytes requested |
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92 # during a read |
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93 self._buffer = CustomBytesIO() |
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94 |
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95 def _get_bytes(self): |
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96 try: |
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97 return encode_with(next(self.iterator), self.encoding) |
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98 except StopIteration: |
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99 return b'' |
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100 |
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101 def _load_bytes(self, size): |
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102 self._buffer.smart_truncate() |
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103 amount_to_load = size - super_len(self._buffer) |
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104 bytes_to_append = True |
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105 |
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106 while amount_to_load > 0 and bytes_to_append: |
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107 bytes_to_append = self._get_bytes() |
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108 amount_to_load -= self._buffer.append(bytes_to_append) |
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109 |
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110 def read(self, size=-1): |
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111 size = int(size) |
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112 if size == -1: |
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113 return b''.join(self.iterator) |
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114 |
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115 self._load_bytes(size) |
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116 return self._buffer.read(size) |