BSON_JSON_READER_T(3)

NAME
bson_json_reader_t - bson_json_reader_t

Bulk JSON to BSON conversion

SYNOPSIS

        #include <bson/bson.h>

        typedef struct _bson_json_reader_t bson_json_reader_t;

        typedef enum {
           BSON_JSON_ERROR_READ_CORRUPT_JS = 1,
           BSON_JSON_ERROR_READ_INVALID_PARAM,
           BSON_JSON_ERROR_READ_CB_FAILURE,
        } bson_json_error_code_t;

DESCRIPTION

The bson_json_reader_t structure is used for reading a sequence of JSON documents and transforming them to bson_t documents.

This can often be useful if you want to perform bulk operations that are defined in a file containing JSON documents.

TIP:
        bson_json_reader_t works upon JSON documents formatted in MongoDB extended JSON format.

EXAMPLE

        /*
         * Copyright 2013 MongoDB, Inc.
         *
         * Licensed under the Apache License, Version 2.0 (the "License");
         * you may not use this file except in compliance with the License.
         * You may obtain a copy of the License at
         *
         *   http://www.apache.org/licenses/LICENSE-2.0
         *
         * Unless required by applicable law or agreed to in writing, software
         * distributed under the License is distributed on an "AS IS" BASIS,
         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
         * See the License for the specific language governing permissions and
         * limitations under the License.
         */

        /*
         * This program will print each JSON document contained in the provided files
         * as a BSON string to STDOUT.
         */

        #include <bson/bson.h>
        #include <stdlib.h>
        #include <stdio.h>

        int
        main (int argc, char *argv[])
        {
           bson_json_reader_t *reader;
           bson_error_t error;
           const char *filename;
           bson_t doc = BSON_INITIALIZER;
           int i;
           int b;

           /*
            * Print program usage if no arguments are provided.
            */
           if (argc == 1) {
              fprintf (stderr, "usage: %s FILE...\n", argv[0]);
              return 1;
           }

           /*
            * Process command line arguments expecting each to be a filename.
            */
           for (i = 1; i < argc; i++) {
              filename = argv[i];

              /*
               * Open the filename provided in command line arguments.
               */
              if (0 == strcmp (filename, "-")) {
                 reader = bson_json_reader_new_from_fd (STDIN_FILENO, false);
              } else {
                 if (!(reader = bson_json_reader_new_from_file (filename, &error))) {
                    fprintf (
                       stderr, "Failed to open \"%s\": %s\n", filename, error.message);
                    continue;
                 }
              }

              /*
               * Convert each incoming document to BSON and print to stdout.
               */
              while ((b = bson_json_reader_read (reader, &doc, &error))) {
                 if (b < 0) {
                    fprintf (stderr, "Error in json parsing:\n%s\n", error.message);
                    abort ();
                 }

                 if (fwrite (bson_get_data (&doc), 1, doc.len, stdout) != doc.len) {
                    fprintf (stderr, "Failed to write to stdout, exiting.\n");
                    exit (1);
                 }
                 bson_reinit (&doc);
              }

              bson_json_reader_destroy (reader);
              bson_destroy (&doc);
           }

           return 0;
        }

AUTHOR
MongoDB, Inc

COPYRIGHT
2017-present, MongoDB, Inc