void gpbridge_import_start(PG_FUNCTION_ARGS)
{
gphadoop_context* context = create_context(fcinfo);
parse_gphd_uri(context, true, fcinfo);
context->current_fragment = list_head(context->gphd_uri->fragments);
build_uri_for_read(context);
context->churl_headers = churl_headers_init();
add_querydata_to_http_header(context, fcinfo);
set_current_fragment_headers(context);
context->churl_handle = churl_init_download(context->uri.data,
context->churl_headers);
/* read some bytes to make sure the connection is established */
churl_read_check_connectivity(context->churl_handle);
}
/*
* Wrapper for libchurl
*/
static void process_request(ClientContext* client_context, char *uri)
{
size_t n = 0;
char buffer[RAW_BUF_SIZE];
print_http_headers(client_context->http_headers);
client_context->handle = churl_init_download(uri, client_context->http_headers);
memset(buffer, 0, RAW_BUF_SIZE);
resetStringInfo(&(client_context->the_rest_buf));
/*
* This try-catch ensures that in case of an exception during the "communication with PXF and the accumulation of
* PXF data in client_context->the_rest_buf", we still get to terminate the libcurl connection nicely and avoid
* leaving the PXF server connection hung.
*/
PG_TRY();
{
/* read some bytes to make sure the connection is established */
churl_read_check_connectivity(client_context->handle);
while ((n = churl_read(client_context->handle, buffer, sizeof(buffer))) != 0)
{
appendBinaryStringInfo(&(client_context->the_rest_buf), buffer, n);
memset(buffer, 0, RAW_BUF_SIZE);
}
churl_cleanup(client_context->handle, false);
}
PG_CATCH();
{
if (client_context->handle)
churl_cleanup(client_context->handle, true);
PG_RE_THROW();
}
PG_END_TRY();
}
