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/*
* This converts S3 plugin's request buffer into Apache Arrow format.
*
* We use GLib binding to call Arrow functions (which is implemented
* in C++) from Fluent Bit.
*
* https://github.com/apache/arrow/tree/master/c_glib
*/
#include <arrow-glib/arrow-glib.h>
#include <inttypes.h>
/*
* GArrowTable is the central structure that represents "table" (a.k.a.
* data frame).
*/
static GArrowTable* parse_json(uint8_t *json, int size)
{
GArrowJSONReader *reader;
GArrowBuffer *buffer;
GArrowBufferInputStream *input;
GArrowJSONReadOptions *options;
GArrowTable *table;
GError *error = NULL;
buffer = garrow_buffer_new(json, size);
if (buffer == NULL) {
return NULL;
}
input = garrow_buffer_input_stream_new(buffer);
if (input == NULL) {
g_object_unref(buffer);
return NULL;
}
options = garrow_json_read_options_new();
if (options == NULL) {
g_object_unref(buffer);
g_object_unref(input);
return NULL;
}
reader = garrow_json_reader_new(GARROW_INPUT_STREAM(input), options, &error);
if (reader == NULL) {
g_error_free(error);
g_object_unref(buffer);
g_object_unref(input);
g_object_unref(options);
return NULL;
}
table = garrow_json_reader_read(reader, &error);
if (table == NULL) {
g_error_free(error);
g_object_unref(buffer);
g_object_unref(input);
g_object_unref(options);
g_object_unref(reader);
return NULL;
}
g_object_unref(buffer);
g_object_unref(input);
g_object_unref(options);
g_object_unref(reader);
return table;
}
static GArrowResizableBuffer* table_to_buffer(GArrowTable *table)
{
GArrowResizableBuffer *buffer;
GArrowBufferOutputStream *sink;
GError *error = NULL;
gboolean success;
buffer = garrow_resizable_buffer_new(0, &error);
if (buffer == NULL) {
g_error_free(error);
return NULL;
}
sink = garrow_buffer_output_stream_new(buffer);
if (sink == NULL) {
g_object_unref(buffer);
return NULL;
}
success = garrow_table_write_as_feather(
table, GARROW_OUTPUT_STREAM(sink),
NULL, &error);
if (!success) {
g_error_free(error);
g_object_unref(buffer);
g_object_unref(sink);
return NULL;
}
g_object_unref(sink);
return buffer;
}
int out_s3_compress_arrow(void *json, size_t size, void **out_buf, size_t *out_size)
{
GArrowTable *table;
GArrowResizableBuffer *buffer;
GBytes *bytes;
gconstpointer ptr;
gsize len;
uint8_t *buf;
table = parse_json((uint8_t *) json, size);
if (table == NULL) {
return -1;
}
buffer = table_to_buffer(table);
g_object_unref(table);
if (buffer == NULL) {
return -1;
}
bytes = garrow_buffer_get_data(GARROW_BUFFER(buffer));
if (bytes == NULL) {
g_object_unref(buffer);
return -1;
}
ptr = g_bytes_get_data(bytes, &len);
if (ptr == NULL) {
g_object_unref(buffer);
g_bytes_unref(bytes);
return -1;
}
buf = malloc(len);
if (buf == NULL) {
g_object_unref(buffer);
g_bytes_unref(bytes);
return -1;
}
memcpy(buf, ptr, len);
*out_buf = (void *) buf;
*out_size = len;
g_object_unref(buffer);
g_bytes_unref(bytes);
return 0;
}
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