1MongoDB::GridFSBucket::UDsoewrnlCooandtSrtirbeuatme(d3M)PoenrgloDDBo:c:uGmreindtFaStBiuocnket::DownloadStream(3)
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NAME

6       MongoDB::GridFSBucket::DownloadStream - File handle abstraction for
7       downloading
8

VERSION

10       version v2.2.1
11

SYNOPSIS

13           # OO API
14           $stream = $bucket->open_download_stream($file_id)
15           while ( my $line = $stream->readline ) {
16               ...
17           }
18
19           # Tied-handle API
20           $fh = $stream->fh;
21           while ( my $line = <$fh> ) {
22               ...
23           }
24

DESCRIPTION

26       This class provides a file abstraction for downloading.  You can stream
27       data from an object of this class using method calls or a tied-handle
28       interface.
29

ATTRIBUTES

31   file_doc
32       The file document for the file to be downloaded.
33
34       Valid file documents typically include the following fields:
35
36       ·   _id – a unique ID for this document, typically a BSON::OID object.
37           Legacy GridFS files may store this value as a different type.
38
39       ·   length – the length of this stored file, in bytes
40
41       ·   chunkSize – the size, in bytes, of each full data chunk of this
42           file.
43
44       ·   uploadDate – the date and time this file was added to GridFS,
45           stored as a BSON datetime value and inflated per the bucket's
46           bson_codec attribute.
47
48       ·   filename – the name of this stored file; this does not need to be
49           unique
50
51       ·   metadata – any additional application-specific data
52
53       ·   md5 – DEPRECATED
54
55       ·   contentType – DEPRECATED
56
57       ·   aliases – DEPRECATED
58

METHODS

60   fh
61           my $fh = $downloadstream->fh;
62           while ( <$fh> ) {
63               say($_);
64           }
65
66       Returns a new Perl file handle tied to this instance of DownloadStream
67       that can be operated on with the built-in functions "read", "readline",
68       "getc", "eof", "fileno" and "close".
69
70       Important notes:
71
72       Allowing one of these tied filehandles to fall out of scope will NOT
73       cause close to be called. This is due to the way tied file handles are
74       implemented in Perl.  For close to be called implicitly, all tied
75       filehandles and the original object must go out of scope.
76
77       Each file handle retrieved this way is tied back to the same object, so
78       calling close on multiple tied file handles and/or the original object
79       will have the same effect as calling close on the original object
80       multiple times.
81
82   close
83           $stream->close
84
85       Works like the builtin "close".
86
87       Important notes:
88
89       ·   Calling close will also cause any tied file handles created for the
90           stream to also close.
91
92       ·   "close" will be automatically called when a stream object is
93           destroyed.
94
95       ·   Calling "close" repeatedly will warn.
96
97   eof
98           if ( $stream->eof() ) { ... }
99
100       Works like the builtin "eof".
101
102   fileno
103           if ( $stream->fileno() ) { ... }
104
105       Works like the builtin "fileno", but it returns -1 if the stream is
106       open and undef if closed.
107
108   getc
109           $char = $stream->getc();
110
111       Works like the builtin "getc".
112
113   read
114           $data = $stream->read($buf, $length, $offset)
115
116       Works like the builtin "read".
117
118   readline
119           $line  = $stream->readline();
120           @lines = $stream->readline();
121
122       Works like the builtin "readline".
123

AUTHORS

125       ·   David Golden <david@mongodb.com>
126
127       ·   Rassi <rassi@mongodb.com>
128
129       ·   Mike Friedman <friedo@friedo.com>
130
131       ·   Kristina Chodorow <k.chodorow@gmail.com>
132
133       ·   Florian Ragwitz <rafl@debian.org>
134

136       This software is Copyright (c) 2019 by MongoDB, Inc.
137
138       This is free software, licensed under:
139
140         The Apache License, Version 2.0, January 2004
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144perl v5.30.1                      2020-M0o1n-g3o0DB::GridFSBucket::DownloadStream(3)
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