EXPORT int mongo_gridfile_get_chunks(struct gridfile_* gf, int start, int count, struct mongo_cursor_** out) {
mongo_cursor* cursor = gridfile_get_chunks((gridfile*)gf, start, count);
if (!cursor)
return 0;
*out = (struct mongo_cursor_*)cursor;
return 1;
}
SEXP mongo_gridfile_get_chunks(SEXP gfile, SEXP start, SEXP count) {
gridfile* _gfile = _checkGridfile(gfile);
int _start = asInteger(start);
int _count = asInteger(count);
mongo_cursor* cursor = gridfile_get_chunks(_gfile, _start, _count);
return _mongo_cursor_create(cursor);
}
gridfs_offset gridfile_read(gridfile* gfile, gridfs_offset size, char* buf)
{
mongo_cursor* chunks;
bson chunk;
int first_chunk;
int last_chunk;
int total_chunks;
gridfs_offset chunksize;
gridfs_offset contentlength;
gridfs_offset bytes_left;
int i;
bson_iterator it;
gridfs_offset chunk_len;
const char * chunk_data;
contentlength = gridfile_get_contentlength(gfile);
chunksize = gridfile_get_chunksize(gfile);
size = (contentlength - gfile->pos < size)
? contentlength - gfile->pos
: size;
bytes_left = size;
first_chunk = (gfile->pos)/chunksize;
last_chunk = (gfile->pos+size-1)/chunksize;
total_chunks = last_chunk - first_chunk + 1;
chunks = gridfile_get_chunks(gfile, first_chunk, total_chunks);
for (i = 0; i < total_chunks; i++) {
mongo_cursor_next(chunks);
chunk = chunks->current;
bson_find(&it, &chunk, "data");
chunk_len = bson_iterator_bin_len( &it );
chunk_data = bson_iterator_bin_data( &it );
if (i == 0) {
chunk_data += (gfile->pos)%chunksize;
chunk_len -= (gfile->pos)%chunksize;
}
if (bytes_left > chunk_len) {
memcpy(buf, chunk_data, chunk_len);
bytes_left -= chunk_len;
buf += chunk_len;
} else {
memcpy(buf, chunk_data, bytes_left);
}
}
mongo_cursor_destroy(chunks);
gfile->pos = gfile->pos + size;
return size;
}
static ngx_int_t ngx_http_gridfs_handler(ngx_http_request_t* request) {
ngx_http_gridfs_loc_conf_t* gridfs_conf;
ngx_http_core_loc_conf_t* core_conf;
ngx_buf_t* buffer;
ngx_chain_t out;
ngx_str_t location_name;
ngx_str_t full_uri;
char* value;
ngx_http_mongo_connection_t *mongo_conn;
gridfs gfs;
gridfile gfile;
gridfs_offset length;
ngx_uint_t numchunks;
char* contenttype;
char* md5;
bson_date_t last_modified;
volatile ngx_uint_t i;
ngx_int_t rc = NGX_OK;
bson query;
bson_oid_t oid;
mongo_cursor ** cursors;
gridfs_offset chunk_len;
const char * chunk_data;
bson_iterator it;
bson chunk;
ngx_pool_cleanup_t* gridfs_cln;
ngx_http_gridfs_cleanup_t* gridfs_clndata;
int status;
volatile ngx_uint_t e = FALSE;
volatile ngx_uint_t ecounter = 0;
uint64_t range_start = 0;
uint64_t range_end = 0;
uint64_t current_buf_pos = 0;
gridfs_conf = ngx_http_get_module_loc_conf(request, ngx_http_gridfs_module);
core_conf = ngx_http_get_module_loc_conf(request, ngx_http_core_module);
// ---------- ENSURE MONGO CONNECTION ---------- //
mongo_conn = ngx_http_get_mongo_connection( gridfs_conf->mongo );
if (mongo_conn == NULL) {
ngx_log_error(NGX_LOG_ERR, request->connection->log, 0,
"Mongo Connection not found: \"%V\"", &gridfs_conf->mongo);
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
if (mongo_conn->conn.connected == 0) {
if (ngx_http_mongo_reconnect(request->connection->log, mongo_conn) == NGX_ERROR) {
ngx_log_error(NGX_LOG_ERR, request->connection->log, 0,
"Could not connect to mongo: \"%V\"", &gridfs_conf->mongo);
if(mongo_conn->conn.connected) { mongo_disconnect(&mongo_conn->conn); }
return NGX_HTTP_SERVICE_UNAVAILABLE;
}
if (ngx_http_mongo_reauth(request->connection->log, mongo_conn) == NGX_ERROR) {
ngx_log_error(NGX_LOG_ERR, request->connection->log, 0,
"Failed to reauth to mongo: \"%V\"", &gridfs_conf->mongo);
if(mongo_conn->conn.connected) { mongo_disconnect(&mongo_conn->conn); }
return NGX_HTTP_SERVICE_UNAVAILABLE;
}
}
// ---------- RETRIEVE KEY ---------- //
location_name = core_conf->name;
full_uri = request->uri;
if (full_uri.len < location_name.len) {
ngx_log_error(NGX_LOG_ERR, request->connection->log, 0,
"Invalid location name or uri.");
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
value = (char*)malloc(sizeof(char) * (full_uri.len - location_name.len + 1));
if (value == NULL) {
ngx_log_error(NGX_LOG_ERR, request->connection->log, 0,
"Failed to allocate memory for value buffer.");
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
memcpy(value, full_uri.data + location_name.len, full_uri.len - location_name.len);
value[full_uri.len - location_name.len] = '\0';
if (!url_decode(value)) {
ngx_log_error(NGX_LOG_ERR, request->connection->log, 0,
"Malformed request.");
free(value);
return NGX_HTTP_BAD_REQUEST;
}
// ---------- RETRIEVE GRIDFILE ---------- //
bson_init(&query);
switch (gridfs_conf->type) {
case BSON_OID:
bson_oid_from_string(&oid, value);
bson_append_oid(&query, (char*)gridfs_conf->field.data, &oid);
break;
case BSON_INT:
bson_append_int(&query, (char*)gridfs_conf->field.data, ngx_atoi((u_char*)value, strlen(value)));
break;
case BSON_STRING:
bson_append_string(&query, (char*)gridfs_conf->field.data, value);
break;
}
bson_finish(&query);
do {
e = FALSE;
if (gridfs_init(&mongo_conn->conn,
(const char*)gridfs_conf->db.data,
(const char*)gridfs_conf->root_collection.data,
&gfs) != MONGO_OK
|| (status = gridfs_find_query(&gfs, &query, &gfile) == MONGO_ERROR)) {
e = TRUE; ecounter++;
if (ecounter > MONGO_MAX_RETRIES_PER_REQUEST
|| ngx_http_mongo_reconnect(request->connection->log, mongo_conn) == NGX_ERROR
|| ngx_http_mongo_reauth(request->connection->log, mongo_conn) == NGX_ERROR) {
ngx_log_error(NGX_LOG_ERR, request->connection->log, 0,
"Mongo connection dropped, could not reconnect");
if(&mongo_conn->conn.connected) { mongo_disconnect(&mongo_conn->conn); }
bson_destroy(&query);
free(value);
return NGX_HTTP_SERVICE_UNAVAILABLE;
}
}
} while (e);
bson_destroy(&query);
free(value);
/* Get information about the file */
length = gridfile_get_contentlength(&gfile);
numchunks = gridfile_get_numchunks(&gfile);
// NaN workaround
if (numchunks > INT_MAX)
{
gridfile_destroy(&gfile);
gridfs_destroy(&gfs);
return NGX_HTTP_NOT_FOUND;
}
contenttype = (char*)gridfile_get_contenttype(&gfile);
md5 = (char*)gridfile_get_md5(&gfile);
last_modified = gridfile_get_uploaddate(&gfile);
// ---------- Partial Range
// set follow-fork-mode child
// attach (pid)
// break ngx_http_gridfs_module.c:959
if (request->headers_in.range) {
gridfs_parse_range(request, &request->headers_in.range->value, &range_start, &range_end, length);
}
// ---------- SEND THE HEADERS ---------- //
if (range_start == 0 && range_end == 0) {
request->headers_out.status = NGX_HTTP_OK;
request->headers_out.content_length_n = length;
} else {
request->headers_out.status = NGX_HTTP_PARTIAL_CONTENT;
request->headers_out.content_length_n = length;
//request->headers_out.content_range = range_end - range_start + 1;
ngx_table_elt_t *content_range;
content_range = ngx_list_push(&request->headers_out.headers);
if (content_range == NULL) {
return NGX_ERROR;
}
request->headers_out.content_range = content_range;
content_range->hash = 1;
ngx_str_set(&content_range->key, "Content-Range");
content_range->value.data = ngx_pnalloc(request->pool,sizeof("bytes -/") - 1 + 3 * NGX_OFF_T_LEN);
if (content_range->value.data == NULL) {
return NGX_ERROR;
}
/* "Content-Range: bytes SSSS-EEEE/TTTT" header */
content_range->value.len = ngx_sprintf(content_range->value.data,
"bytes %O-%O/%O",
range_start, range_end,
request->headers_out.content_length_n)
- content_range->value.data;
request->headers_out.content_length_n = range_end - range_start + 1;
}
if (contenttype != NULL) {
request->headers_out.content_type.len = strlen(contenttype);
request->headers_out.content_type.data = (u_char*)contenttype;
}
else ngx_http_set_content_type(request);
// use md5 field as ETag if possible
if (md5 != NULL) {
request->headers_out.etag = ngx_list_push(&request->headers_out.headers);
request->headers_out.etag->hash = 1;
request->headers_out.etag->key.len = sizeof("ETag") - 1;
request->headers_out.etag->key.data = (u_char*)"ETag";
ngx_buf_t *b;
b = ngx_create_temp_buf(request->pool, strlen(md5) + 2);
b->last = ngx_sprintf(b->last, "\"%s\"", md5);
request->headers_out.etag->value.len = strlen(md5) + 2;
request->headers_out.etag->value.data = b->start;
}
// use uploadDate field as last_modified if possible
if (last_modified) {
request->headers_out.last_modified_time = (time_t)(last_modified/1000);
}
/* Determine if content is gzipped, set headers accordingly */
if ( gridfile_get_boolean(&gfile,"gzipped") ) {
ngx_log_error(NGX_LOG_ERR, request->connection->log, 0, gridfile_get_field(&gfile,"gzipped") );
request->headers_out.content_encoding = ngx_list_push(&request->headers_out.headers);
if (request->headers_out.content_encoding == NULL) {
gridfile_destroy(&gfile);
gridfs_destroy(&gfs);
return NGX_ERROR;
}
request->headers_out.content_encoding->hash = 1;
request->headers_out.content_encoding->key.len = sizeof("Content-Encoding") - 1;
request->headers_out.content_encoding->key.data = (u_char *) "Content-Encoding";
request->headers_out.content_encoding->value.len = sizeof("gzip") - 1;
request->headers_out.content_encoding->value.data = (u_char *) "gzip";
}
ngx_http_send_header(request);
// ---------- SEND THE BODY ---------- //
/* Empty file */
if (numchunks == 0) {
/* Allocate space for the response buffer */
buffer = ngx_pcalloc(request->pool, sizeof(ngx_buf_t));
if (buffer == NULL) {
ngx_log_error(NGX_LOG_ERR, request->connection->log, 0,
"Failed to allocate response buffer");
gridfile_destroy(&gfile);
gridfs_destroy(&gfs);
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
buffer->pos = NULL;
buffer->last = NULL;
buffer->memory = 1;
buffer->last_buf = 1;
out.buf = buffer;
out.next = NULL;
gridfile_destroy(&gfile);
gridfs_destroy(&gfs);
return ngx_http_output_filter(request, &out);
}
cursors = (mongo_cursor **)ngx_pcalloc(request->pool, sizeof(mongo_cursor *) * numchunks);
if (cursors == NULL) {
gridfile_destroy(&gfile);
gridfs_destroy(&gfs);
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
ngx_memzero( cursors, sizeof(mongo_cursor *) * numchunks);
/* Hook in the cleanup function */
gridfs_cln = ngx_pool_cleanup_add(request->pool, sizeof(ngx_http_gridfs_cleanup_t));
if (gridfs_cln == NULL) {
gridfile_destroy(&gfile);
gridfs_destroy(&gfs);
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
gridfs_cln->handler = ngx_http_gridfs_cleanup;
gridfs_clndata = gridfs_cln->data;
gridfs_clndata->cursors = cursors;
gridfs_clndata->numchunks = numchunks;
/* Read and serve chunk by chunk */
for (i = 0; i < numchunks; i++) {
/* Allocate space for the response buffer */
buffer = ngx_pcalloc(request->pool, sizeof(ngx_buf_t));
if (buffer == NULL) {
ngx_log_error(NGX_LOG_ERR, request->connection->log, 0,
"Failed to allocate response buffer");
gridfile_destroy(&gfile);
gridfs_destroy(&gfs);
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
/* Fetch the chunk from mongo */
do {
e = FALSE;
cursors[i] = gridfile_get_chunks(&gfile, i, 1);
if (!(cursors[i] && mongo_cursor_next(cursors[i]) == MONGO_OK)) {
e = TRUE; ecounter++;
if (ecounter > MONGO_MAX_RETRIES_PER_REQUEST
|| ngx_http_mongo_reconnect(request->connection->log, mongo_conn) == NGX_ERROR
|| ngx_http_mongo_reauth(request->connection->log, mongo_conn) == NGX_ERROR) {
ngx_log_error(NGX_LOG_ERR, request->connection->log, 0,
"Mongo connection dropped, could not reconnect");
if(mongo_conn->conn.connected) { mongo_disconnect(&mongo_conn->conn); }
gridfile_destroy(&gfile);
gridfs_destroy(&gfs);
return NGX_HTTP_SERVICE_UNAVAILABLE;
}
}
} while (e);
chunk = cursors[i]->current;
bson_find(&it, &chunk, "data");
chunk_len = bson_iterator_bin_len( &it ); // break ngx_http_gridfs_module.c:1099
chunk_data = bson_iterator_bin_data( &it );
if (range_start == 0 && range_end == 0) {
/* <<no range request>> */
/* Set up the buffer chain */
buffer->pos = (u_char*)chunk_data;
buffer->last = (u_char*)chunk_data + chunk_len;
buffer->memory = 1;
buffer->last_buf = (i == numchunks-1);
out.buf = buffer;
out.next = NULL;
/* Serve the Chunk */
rc = ngx_http_output_filter(request, &out);
} else {
/* <<range request>> */
if ( range_start >= (current_buf_pos+chunk_len) ||
range_end <= current_buf_pos) {
/* no output */
ngx_pfree(request->pool, buffer);
} else {
if (range_start <= current_buf_pos) {
buffer->pos = (u_char*)chunk_data;
} else {
buffer->pos = (u_char*)chunk_data + (range_start - current_buf_pos);
}
if (range_end < (current_buf_pos+chunk_len)) {
buffer->last = (u_char*)chunk_data + (range_end - current_buf_pos + 1);
} else {
buffer->last = (u_char*)chunk_data + chunk_len;
}
if (buffer->pos == buffer->last) {
ngx_log_error(NGX_LOG_ALERT, request->connection->log, 0,
"zero size buf in writer "
"range_start:%d range_end:%d "
"current_buf_pos:%d chunk_len:%d i:%d numchunk:%d",
range_start,range_end,
current_buf_pos, chunk_len,
i,numchunks);
}
buffer->memory = 1;
buffer->last_buf = (i == numchunks-1) || (range_end < (current_buf_pos+chunk_len));
out.buf = buffer;
out.next = NULL;
/* Serve the Chunk */
rc = ngx_http_output_filter(request, &out);
}
}
current_buf_pos += chunk_len;
/* TODO: More Codes to Catch? */
if (rc == NGX_ERROR) {
gridfile_destroy(&gfile);
gridfs_destroy(&gfs);
return NGX_ERROR;
}
}
gridfile_destroy(&gfile);
gridfs_destroy(&gfs);
return rc;
}
static ngx_int_t ngx_http_gridfs_handler(ngx_http_request_t* request) {
ngx_http_gridfs_loc_conf_t* gridfs_conf;
ngx_http_core_loc_conf_t* core_conf;
ngx_buf_t* buffer;
ngx_chain_t out;
ngx_str_t location_name;
ngx_str_t full_uri;
// --------------- xulin add start -------------------
char* ml_args;
char* arg;
unsigned int add_arg;
unsigned int add_len;
// --------------- xulin add end -------------------
char* value;
ngx_http_mongo_connection_t *mongo_conn;
gridfs gfs;
gridfile gfile;
gridfs_offset length;
ngx_uint_t numchunks;
char* contenttype;
char* md5;
bson_date_t last_modified;
volatile ngx_uint_t i;
ngx_int_t rc = NGX_OK;
bson query;
bson_oid_t oid;
mongo_cursor ** cursors;
gridfs_offset chunk_len;
const char * chunk_data;
bson_iterator it;
bson chunk;
ngx_pool_cleanup_t* gridfs_cln;
ngx_http_gridfs_cleanup_t* gridfs_clndata;
int status;
volatile ngx_uint_t e = FALSE;
volatile ngx_uint_t ecounter = 0;
gridfs_conf = ngx_http_get_module_loc_conf(request, ngx_http_gridfs_module);
core_conf = ngx_http_get_module_loc_conf(request, ngx_http_core_module);
// ---------- ENSURE MONGO CONNECTION ---------- //
mongo_conn = ngx_http_get_mongo_connection( gridfs_conf->mongo );
if (mongo_conn == NULL) {
ngx_log_error(NGX_LOG_ERR, request->connection->log, 0,
"Mongo Connection not found: \"%V\"", &gridfs_conf->mongo);
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
if ( !(&mongo_conn->conn.connected)
&& (ngx_http_mongo_reconnect(request->connection->log, mongo_conn) == NGX_ERROR
|| ngx_http_mongo_reauth(request->connection->log, mongo_conn) == NGX_ERROR)) {
ngx_log_error(NGX_LOG_ERR, request->connection->log, 0,
"Could not connect to mongo: \"%V\"", &gridfs_conf->mongo);
if(&mongo_conn->conn.connected) { mongo_disconnect(&mongo_conn->conn); }
return NGX_HTTP_SERVICE_UNAVAILABLE;
}
// ---------- RETRIEVE KEY ---------- //
location_name = core_conf->name;
full_uri = request->uri;
if (full_uri.len < location_name.len) {
ngx_log_error(NGX_LOG_ERR, request->connection->log, 0,
"Invalid location name or uri.");
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
value = (char*)malloc(sizeof(char) * (full_uri.len - location_name.len + 1 + request->args.len + 1));
if (value == NULL) {
ngx_log_error(NGX_LOG_ERR, request->connection->log, 0,
"Failed to allocate memory for value buffer.");
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
memcpy(value, full_uri.data + location_name.len, full_uri.len - location_name.len);
// ------------------------------------ xulin add start --------------------------------------
if (request->args.len > 0)
{
ml_args = (char*)malloc(sizeof(char) * (request->args.len + 1));
memcpy(ml_args, request->args.data, request->args.len);
ml_args[request->args.len] = '\0';
add_len = full_uri.len - location_name.len;
memcpy(value + add_len, "?", 1);
add_len += 1;
arg = strtok(ml_args, "&");
while (arg != NULL)
{
add_arg = 1;
if (strstr(arg, "xc_md5") != NULL)
{
add_arg = 0;
}
else if (strstr(arg, "_xingcloud_t") != NULL)
{
add_arg = 0;
}
if (add_arg == 1)
{
memcpy(value + add_len, arg, strlen(arg));
add_len += strlen(arg);
memcpy(value + add_len, "&", 1);
add_len += 1;
}
arg = strtok(NULL, "&");
}
free(ml_args);
if (value[add_len - 1] == '?' || value[add_len - 1] == '&')
{
value[add_len - 1] = '\0';
}
else
{
value[add_len] = '\0';
}
}
ngx_log_error(NGX_LOG_ERR, request->connection->log, 0, "ml_url = [%s]", value);
// ------------------------------------ xulin add end --------------------------------------
if (!url_decode(value)) {
ngx_log_error(NGX_LOG_ERR, request->connection->log, 0,
"Malformed request.");
free(value);
return NGX_HTTP_BAD_REQUEST;
}
// ---------- RETRIEVE GRIDFILE ---------- //
do {
e = FALSE;
if (gridfs_init(&mongo_conn->conn,
(const char*)gridfs_conf->db.data,
(const char*)gridfs_conf->root_collection.data,
&gfs) != MONGO_OK) {
e = TRUE; ecounter++;
if (ecounter > MONGO_MAX_RETRIES_PER_REQUEST
|| ngx_http_mongo_reconnect(request->connection->log, mongo_conn) == NGX_ERROR
|| ngx_http_mongo_reauth(request->connection->log, mongo_conn) == NGX_ERROR) {
ngx_log_error(NGX_LOG_ERR, request->connection->log, 0,
"Mongo connection dropped, could not reconnect");
if(&mongo_conn->conn.connected) { mongo_disconnect(&mongo_conn->conn); }
free(value);
return NGX_HTTP_SERVICE_UNAVAILABLE;
}
}
} while (e);
bson_init(&query);
switch (gridfs_conf->type) {
case BSON_OID:
bson_oid_from_string(&oid, value);
bson_append_oid(&query, (char*)gridfs_conf->field.data, &oid);
break;
case BSON_INT:
bson_append_int(&query, (char*)gridfs_conf->field.data, ngx_atoi((u_char*)value, strlen(value)));
break;
case BSON_STRING:
bson_append_string(&query, (char*)gridfs_conf->field.data, value);
break;
}
bson_finish(&query);
status = gridfs_find_query(&gfs, &query, &gfile);
bson_destroy(&query);
free(value);
if(status == MONGO_ERROR) {
gridfs_destroy(&gfs);
return NGX_HTTP_NOT_FOUND;
}
/* Get information about the file */
length = gridfile_get_contentlength(&gfile);
numchunks = gridfile_get_numchunks(&gfile);
contenttype = (char*)gridfile_get_contenttype(&gfile);
md5 = (char*)gridfile_get_md5(&gfile);
last_modified = gridfile_get_uploaddate(&gfile);
// ---------- SEND THE HEADERS ---------- //
request->headers_out.status = NGX_HTTP_OK;
request->headers_out.content_length_n = length;
if (contenttype != NULL) {
request->headers_out.content_type.len = strlen(contenttype);
request->headers_out.content_type.data = (u_char*)contenttype;
}
else ngx_http_set_content_type(request);
// use md5 field as ETag if possible
if (md5 != NULL) {
request->headers_out.etag = ngx_list_push(&request->headers_out.headers);
request->headers_out.etag->hash = 1;
request->headers_out.etag->key.len = sizeof("ETag") - 1;
request->headers_out.etag->key.data = (u_char*)"ETag";
ngx_buf_t *b;
b = ngx_create_temp_buf(request->pool, strlen(md5) + 2);
b->last = ngx_sprintf(b->last, "\"%s\"", md5);
request->headers_out.etag->value.len = strlen(md5) + 2;
request->headers_out.etag->value.data = b->start;
}
// use uploadDate field as last_modified if possible
if (last_modified) {
request->headers_out.last_modified_time = (time_t)(last_modified/1000);
}
/* Determine if content is gzipped, set headers accordingly */
if ( gridfile_get_boolean(&gfile,"gzipped") ) {
ngx_log_error(NGX_LOG_ERR, request->connection->log, 0, gridfile_get_field(&gfile,"gzipped") );
request->headers_out.content_encoding = ngx_list_push(&request->headers_out.headers);
if (request->headers_out.content_encoding == NULL) {
gridfile_destroy(&gfile);
gridfs_destroy(&gfs);
return NGX_ERROR;
}
request->headers_out.content_encoding->hash = 1;
request->headers_out.content_encoding->key.len = sizeof("Content-Encoding") - 1;
request->headers_out.content_encoding->key.data = (u_char *) "Content-Encoding";
request->headers_out.content_encoding->value.len = sizeof("gzip") - 1;
request->headers_out.content_encoding->value.data = (u_char *) "gzip";
}
ngx_http_send_header(request);
// ---------- SEND THE BODY ---------- //
/* Empty file */
if (numchunks == 0) {
/* Allocate space for the response buffer */
buffer = ngx_pcalloc(request->pool, sizeof(ngx_buf_t));
if (buffer == NULL) {
ngx_log_error(NGX_LOG_ERR, request->connection->log, 0,
"Failed to allocate response buffer");
gridfile_destroy(&gfile);
gridfs_destroy(&gfs);
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
buffer->pos = NULL;
buffer->last = NULL;
buffer->memory = 1;
buffer->last_buf = 1;
out.buf = buffer;
out.next = NULL;
gridfile_destroy(&gfile);
gridfs_destroy(&gfs);
return ngx_http_output_filter(request, &out);
}
cursors = (mongo_cursor **)ngx_pcalloc(request->pool, sizeof(mongo_cursor *) * numchunks);
if (cursors == NULL) {
gridfile_destroy(&gfile);
gridfs_destroy(&gfs);
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
ngx_memzero( cursors, sizeof(mongo_cursor *) * numchunks);
/* Hook in the cleanup function */
gridfs_cln = ngx_pool_cleanup_add(request->pool, sizeof(ngx_http_gridfs_cleanup_t));
if (gridfs_cln == NULL) {
gridfile_destroy(&gfile);
gridfs_destroy(&gfs);
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
gridfs_cln->handler = ngx_http_gridfs_cleanup;
gridfs_clndata = gridfs_cln->data;
gridfs_clndata->cursors = cursors;
gridfs_clndata->numchunks = numchunks;
/* Read and serve chunk by chunk */
for (i = 0; i < numchunks; i++) {
/* Allocate space for the response buffer */
buffer = ngx_pcalloc(request->pool, sizeof(ngx_buf_t));
if (buffer == NULL) {
ngx_log_error(NGX_LOG_ERR, request->connection->log, 0,
"Failed to allocate response buffer");
gridfile_destroy(&gfile);
gridfs_destroy(&gfs);
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
/* Fetch the chunk from mongo */
do {
e = FALSE;
cursors[i] = gridfile_get_chunks(&gfile, i, 1);
if (!(cursors[i] && mongo_cursor_next(cursors[i]) == MONGO_OK)) {
e = TRUE; ecounter++;
if (ecounter > MONGO_MAX_RETRIES_PER_REQUEST
|| ngx_http_mongo_reconnect(request->connection->log, mongo_conn) == NGX_ERROR
|| ngx_http_mongo_reauth(request->connection->log, mongo_conn) == NGX_ERROR) {
ngx_log_error(NGX_LOG_ERR, request->connection->log, 0,
"Mongo connection dropped, could not reconnect");
if(&mongo_conn->conn.connected) { mongo_disconnect(&mongo_conn->conn); }
gridfile_destroy(&gfile);
gridfs_destroy(&gfs);
return NGX_HTTP_SERVICE_UNAVAILABLE;
}
}
} while (e);
chunk = cursors[i]->current;
bson_find(&it, &chunk, "data");
chunk_len = bson_iterator_bin_len( &it );
chunk_data = bson_iterator_bin_data( &it );
/* Set up the buffer chain */
buffer->pos = (u_char*)chunk_data;
buffer->last = (u_char*)chunk_data + chunk_len;
buffer->memory = 1;
buffer->last_buf = (i == numchunks-1);
out.buf = buffer;
out.next = NULL;
/* Serve the Chunk */
rc = ngx_http_output_filter(request, &out);
/* TODO: More Codes to Catch? */
if (rc == NGX_ERROR) {
gridfile_destroy(&gfile);
gridfs_destroy(&gfs);
return NGX_ERROR;
}
}
gridfile_destroy(&gfile);
gridfs_destroy(&gfs);
return rc;
}
static ngx_int_t ngx_http_gridfs_handler(ngx_http_request_t* request) {
ngx_http_gridfs_loc_conf_t* gridfs_conf;
ngx_http_core_loc_conf_t* core_conf;
ngx_buf_t* buffer;
ngx_chain_t out;
ngx_str_t location_name;
ngx_str_t full_uri;
char* value;
gridfs gfs;
gridfile gfile;
gridfs_offset length;
ngx_uint_t chunksize;
ngx_uint_t numchunks;
char* contenttype;
ngx_uint_t i;
ngx_int_t rc = NGX_OK;
bson query;
bson_buffer buf;
bson_oid_t oid;
mongo_cursor ** cursors;
gridfs_offset chunk_len;
const char * chunk_data;
bson_iterator it;
bson chunk;
ngx_pool_cleanup_t* gridfs_cln;
ngx_http_gridfs_cleanup_t* gridfs_clndata;
gridfs_conf = ngx_http_get_module_loc_conf(request, ngx_http_gridfs_module);
core_conf = ngx_http_get_module_loc_conf(request, ngx_http_core_module);
location_name = core_conf->name;
full_uri = request->uri;
gridfs_cln = ngx_pool_cleanup_add(request->pool, sizeof(ngx_http_gridfs_cleanup_t));
if (gridfs_cln == NULL) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
gridfs_cln->handler = ngx_http_gridfs_cleanup;
gridfs_clndata = gridfs_cln->data;
/* defensive */
if (full_uri.len < location_name.len) {
ngx_log_error(NGX_LOG_ERR, request->connection->log, 0,
"Invalid location name or uri.");
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
/* Extract the value from the uri */
value = (char*)malloc(sizeof(char) * (full_uri.len - location_name.len + 1));
if (value == NULL) {
ngx_log_error(NGX_LOG_ERR, request->connection->log, 0,
"Failed to allocate memory for value buffer.");
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
memcpy(value, full_uri.data + location_name.len, full_uri.len - location_name.len);
value[full_uri.len - location_name.len] = '\0';
/* URL Decoding */
if (!url_decode(value)) {
ngx_log_error(NGX_LOG_ERR, request->connection->log, 0,
"Malformed request.");
free(value);
return NGX_HTTP_BAD_REQUEST;
}
/* Find the GridFile */
gridfs_init(gridfs_conf->mongod_conn,
(const char*)gridfs_conf->gridfs_db.data,
(const char*)gridfs_conf->gridfs_root_collection.data,
&gfs);
bson_buffer_init(&buf);
switch (gridfs_conf->gridfs_type) {
case bson_oid:
bson_oid_from_string(&oid, value);
bson_append_oid(&buf, (char*)gridfs_conf->gridfs_field.data, &oid);
break;
case bson_int:
bson_append_int(&buf, (char*)gridfs_conf->gridfs_field.data, ngx_atoi((u_char*)value, strlen(value)));
break;
case bson_string:
bson_append_string(&buf, (char*)gridfs_conf->gridfs_field.data, value);
break;
}
bson_from_buffer(&query, &buf);
if(!gridfs_find_query(&gfs, &query, &gfile)){
bson_destroy(&query);
free(value);
return NGX_HTTP_NOT_FOUND;
}
bson_destroy(&query);
free(value);
/* Get information about the file */
length = gridfile_get_contentlength(&gfile);
chunksize = gridfile_get_chunksize(&gfile);
numchunks = gridfile_get_numchunks(&gfile);
contenttype = (char*)gridfile_get_contenttype(&gfile);
/* Set the headers */
request->headers_out.status = NGX_HTTP_OK;
request->headers_out.content_length_n = length;
if (contenttype != NULL) {
request->headers_out.content_type.len = strlen(contenttype);
request->headers_out.content_type.data = (u_char*)contenttype;
}
else ngx_http_set_content_type(request);
/* Determine if content is gzipped, set headers accordingly */
if ( gridfile_get_boolean(&gfile,"gzipped") ) {
ngx_log_error(NGX_LOG_ERR, request->connection->log, 0, gridfile_get_field(&gfile,"gzipped") );
request->headers_out.content_encoding = ngx_list_push(&request->headers_out.headers);
if (request->headers_out.content_encoding == NULL) {
return NGX_ERROR;
}
request->headers_out.content_encoding->hash = 1;
request->headers_out.content_encoding->key.len = sizeof("Content-Encoding") - 1;
request->headers_out.content_encoding->key.data = (u_char *) "Content-Encoding";
request->headers_out.content_encoding->value.len = sizeof("gzip") - 1;
request->headers_out.content_encoding->value.data = (u_char *) "gzip";
}
ngx_http_send_header(request);
if (numchunks == 0) {
/* Allocate space for the response buffer */
buffer = ngx_pcalloc(request->pool, sizeof(ngx_buf_t));
if (buffer == NULL) {
ngx_log_error(NGX_LOG_ERR, request->connection->log, 0,
"Failed to allocate response buffer");
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
buffer->pos = NULL;
buffer->last = NULL;
buffer->memory = 1;
buffer->last_buf = 1;
out.buf = buffer;
out.next = NULL;
return ngx_http_output_filter(request, &out);
}
cursors = (mongo_cursor **)ngx_pcalloc(request->pool, sizeof(mongo_cursor *) * numchunks);
/* Read and serve chunk by chunk */
for (i = 0; i < numchunks; i++) {
/* Allocate space for the response buffer */
buffer = ngx_pcalloc(request->pool, sizeof(ngx_buf_t));
if (buffer == NULL) {
ngx_log_error(NGX_LOG_ERR, request->connection->log, 0,
"Failed to allocate response buffer");
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
/* Fetch the chunk from mongo */
cursors[i] = gridfile_get_chunks(&gfile, i, 1);
mongo_cursor_next(cursors[i]);
chunk = cursors[i]->current;
bson_find(&it, &chunk, "data");
chunk_len = bson_iterator_bin_len( &it );
chunk_data = bson_iterator_bin_data( &it );
/* Set up the buffer chain */
buffer->pos = (u_char*)chunk_data;
buffer->last = (u_char*)chunk_data + chunk_len;
buffer->memory = 1;
buffer->last_buf = (i == numchunks-1);
out.buf = buffer;
out.next = NULL;
/* Serve the Chunk */
rc = ngx_http_output_filter(request, &out);
/* TODO: More Codes to Catch? */
if (rc == NGX_ERROR) {
return NGX_ERROR;
}
}
gridfs_clndata->cursors = cursors;
gridfs_clndata->numchunks = numchunks;
return rc;
}