1BSON_JSON_READER_T(3)               Libbson              BSON_JSON_READER_T(3)
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NAME

6       bson_json_reader_t - bson_json_reader_t
7
8       Bulk JSON to BSON conversion
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SYNOPSIS

11          #include <bson/bson.h>
12
13          typedef struct _bson_json_reader_t bson_json_reader_t;
14
15          typedef enum {
16             BSON_JSON_ERROR_READ_CORRUPT_JS = 1,
17             BSON_JSON_ERROR_READ_INVALID_PARAM,
18             BSON_JSON_ERROR_READ_CB_FAILURE,
19          } bson_json_error_code_t;
20

DESCRIPTION

22       The bson_json_reader_t structure is used for reading a sequence of JSON
23       documents and transforming them to bson_t documents.
24
25       This can often be useful if you want to perform  bulk  operations  that
26       are defined in a file containing JSON documents.
27
28       TIP:
29          bson_json_reader_t  works  upon  JSON documents formatted in MongoDB
30          extended JSON format.
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EXAMPLE

33          /*
34           * Copyright 2013 MongoDB, Inc.
35           *
36           * Licensed under the Apache License, Version 2.0 (the "License");
37           * you may not use this file except in compliance with the License.
38           * You may obtain a copy of the License at
39           *
40           *   http://www.apache.org/licenses/LICENSE-2.0
41           *
42           * Unless required by applicable law or agreed to in writing, software
43           * distributed under the License is distributed on an "AS IS" BASIS,
44           * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
45           * See the License for the specific language governing permissions and
46           * limitations under the License.
47           */
48
49
50          /*
51           * This program will print each JSON document contained in the provided files
52           * as a BSON string to STDOUT.
53           */
54
55
56          #include <bson/bson.h>
57          #include <stdlib.h>
58          #include <stdio.h>
59
60
61          int
62          main (int argc, char *argv[])
63          {
64             bson_json_reader_t *reader;
65             bson_error_t error;
66             const char *filename;
67             bson_t doc = BSON_INITIALIZER;
68             int i;
69             int b;
70
71             /*
72              * Print program usage if no arguments are provided.
73              */
74             if (argc == 1) {
75                fprintf (stderr, "usage: %s FILE...\n", argv[0]);
76                return 1;
77             }
78
79             /*
80              * Process command line arguments expecting each to be a filename.
81              */
82             for (i = 1; i < argc; i++) {
83                filename = argv[i];
84
85                /*
86                 * Open the filename provided in command line arguments.
87                 */
88                if (0 == strcmp (filename, "-")) {
89                   reader = bson_json_reader_new_from_fd (STDIN_FILENO, false);
90                } else {
91                   if (!(reader = bson_json_reader_new_from_file (filename, &error))) {
92                      fprintf (
93                         stderr, "Failed to open \"%s\": %s\n", filename, error.message);
94                      continue;
95                   }
96                }
97
98                /*
99                 * Convert each incoming document to BSON and print to stdout.
100                 */
101                while ((b = bson_json_reader_read (reader, &doc, &error))) {
102                   if (b < 0) {
103                      fprintf (stderr, "Error in json parsing:\n%s\n", error.message);
104                      abort ();
105                   }
106
107                   if (fwrite (bson_get_data (&doc), 1, doc.len, stdout) != doc.len) {
108                      fprintf (stderr, "Failed to write to stdout, exiting.\n");
109                      exit (1);
110                   }
111                   bson_reinit (&doc);
112                }
113
114                bson_json_reader_destroy (reader);
115                bson_destroy (&doc);
116             }
117
118             return 0;
119          }
120

AUTHOR

122       MongoDB, Inc
123

125       2017-present, MongoDB, Inc
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1301.15.2                           Nov 06, 2019            BSON_JSON_READER_T(3)
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