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serval-dna/rhizome_store.c
Andrew Bettison c9131f43a2 POST /restful/rhizome/append for journals
2015-03-02 18:52:12 +10:30

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/*
Serval DNA Rhizome storage
Copyright (C) 2013 Serval Project Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <assert.h>
#ifdef HAVE_SYS_STATVFS_H
# include <sys/statvfs.h>
#else
# if defined(HAVE_SYS_STAT_H) && defined(HAVE_SYS_VFS_H)
# include <sys/stat.h>
# include <sys/vfs.h>
# define statvfs statfs
# endif
#endif
#include "serval.h"
#include "rhizome.h"
#include "conf.h"
#include "strlcpy.h"
#define RHIZOME_BUFFER_MAXIMUM_SIZE (1024*1024)
uint64_t rhizome_copy_file_to_blob(int fd, uint64_t id, size_t size);
int rhizome_exists(const rhizome_filehash_t *hashp)
{
uint64_t gotfile = 0;
if (sqlite_exec_uint64(&gotfile, "SELECT COUNT(*) FROM FILES WHERE id = ? and datavalid = 1;", RHIZOME_FILEHASH_T, hashp, END) != 1)
return 0;
if (gotfile==0)
return 0;
uint64_t blob_rowid;
if (sqlite_exec_uint64(&blob_rowid,
"SELECT rowid "
"FROM FILEBLOBS "
"WHERE id = ?", RHIZOME_FILEHASH_T, hashp, END) == -1)
return 0;
if (blob_rowid !=0)
return 1;
// No row in FILEBLOBS, look for an external blob file.
char blob_path[1024];
if (!FORMF_RHIZOME_STORE_PATH(blob_path, "%s/%s", RHIZOME_BLOB_SUBDIR, alloca_tohex_rhizome_filehash_t(*hashp)))
return 0;
struct stat st;
if (stat(blob_path, &st) == -1)
return 0;
return 1;
}
/* Creates a row in the FILEBLOBS table and return the ROWID. Returns 0 if unsuccessful (error
* logged).
*/
static uint64_t rhizome_create_fileblob(sqlite_retry_state *retry, uint64_t id, size_t size)
{
if (sqlite_exec_void_retry(
retry,
"INSERT OR REPLACE INTO FILEBLOBS(id,data) VALUES(?,?)",
UINT64_TOSTR, id,
ZEROBLOB, (int)size,
END) == -1
) {
WHYF("Failed to create blob, size=%zu, id=%"PRIu64, size, id);
return 0;
}
uint64_t rowid = sqlite3_last_insert_rowid(rhizome_db);
if (config.debug.rhizome_store)
DEBUGF("Inserted fileblob rowid=%"PRId64" for id='%"PRIu64"'", rowid, id);
return rowid;
}
static int rhizome_delete_external(const char *id)
{
// attempt to remove any external blob
char blob_path[1024];
if (!FORMF_RHIZOME_STORE_PATH(blob_path, "%s/%s", RHIZOME_BLOB_SUBDIR, id))
return -1;
if (unlink(blob_path) == -1) {
if (errno != ENOENT)
return WHYF_perror("unlink(%s)", alloca_str_toprint(blob_path));
return 1;
}
if (config.debug.rhizome_store)
DEBUGF("Deleted blob file %s", blob_path);
return 0;
}
static int rhizome_delete_file_id_retry(sqlite_retry_state *retry, const char *id)
{
int ret = 0;
rhizome_delete_external(id);
sqlite3_stmt *statement = sqlite_prepare_bind(retry, "DELETE FROM fileblobs WHERE id = ?", STATIC_TEXT, id, END);
if (!statement || sqlite_exec_retry(retry, statement) == -1)
ret = -1;
statement = sqlite_prepare_bind(retry, "DELETE FROM files WHERE id = ?", STATIC_TEXT, id, END);
if (!statement || sqlite_exec_retry(retry, statement) == -1)
ret = -1;
return ret == -1 ? -1 : sqlite3_changes(rhizome_db) ? 0 : 1;
}
static int rhizome_delete_payload_retry(sqlite_retry_state *retry, const rhizome_bid_t *bidp)
{
strbuf fh = strbuf_alloca(RHIZOME_FILEHASH_STRLEN + 1);
int rows = sqlite_exec_strbuf_retry(retry, fh, "SELECT filehash FROM manifests WHERE id = ?", RHIZOME_BID_T, bidp, END);
if (rows == -1)
return -1;
if (rows && rhizome_delete_file_id_retry(retry, strbuf_str(fh)) == -1)
return -1;
return 0;
}
/* Remove a bundle's payload (file) from the database, given its manifest ID, leaving its manifest
* untouched if present.
*
* Returns 0 if manifest is found, its payload is found and removed
* Returns 1 if manifest or payload is not found
* Returns -1 on error
*
* @author Andrew Bettison <andrew@servalproject.com>
*/
int rhizome_delete_payload(const rhizome_bid_t *bidp)
{
sqlite_retry_state retry = SQLITE_RETRY_STATE_DEFAULT;
return rhizome_delete_payload_retry(&retry, bidp);
}
int rhizome_delete_file_id(const char *id)
{
sqlite_retry_state retry = SQLITE_RETRY_STATE_DEFAULT;
return rhizome_delete_file_id_retry(&retry, id);
}
/* Remove a file from the database, given its file hash.
*
* Returns 0 if file is found and removed
* Returns 1 if file is not found
* Returns -1 on error
*
* @author Andrew Bettison <andrew@servalproject.com>
*/
int rhizome_delete_file(const rhizome_filehash_t *hashp)
{
return rhizome_delete_file_id(alloca_tohex_rhizome_filehash_t(*hashp));
}
static uint64_t store_get_free_space()
{
const char *fake_space = getenv("SERVALD_FREE_SPACE");
if (fake_space)
return atol(fake_space);
#if defined(HAVE_SYS_STATVFS_H) || (defined(HAVE_SYS_STAT_H) && defined(HAVE_SYS_VFS_H))
char store_path[1024];
if (!FORMF_RHIZOME_STORE_PATH(store_path, "rhizome.db"))
return UINT64_MAX;
struct statvfs stats;
if (statvfs(store_path, &stats)==-1){
WARNF_perror("statvfs(%s)", store_path);
return UINT64_MAX;
}
return stats.f_bsize * stats.f_bfree;
#else
return UINT64_MAX;
#endif
}
static uint64_t store_space_limit(uint64_t current_size)
{
uint64_t limit = config.rhizome.database_size;
if (config.rhizome.min_free_space!=0){
uint64_t free_space = store_get_free_space();
if (free_space < config.rhizome.min_free_space){
if (current_size + free_space < config.rhizome.min_free_space)
limit = 0;
else
limit = current_size + free_space - config.rhizome.min_free_space;
}
}
return limit;
}
// TODO readonly version?
static enum rhizome_payload_status store_make_space(uint64_t bytes, struct rhizome_cleanup_report *report)
{
uint64_t external_bytes;
uint64_t db_page_size;
uint64_t db_page_count;
uint64_t db_free_page_count;
sqlite_retry_state retry = SQLITE_RETRY_STATE_DEFAULT;
// No limit?
if (config.rhizome.database_size==UINT64_MAX && config.rhizome.min_free_space==0)
return RHIZOME_PAYLOAD_STATUS_NEW;
// TODO index external_bytes calculation and/or cache result
if ( sqlite_exec_uint64_retry(&retry, &db_page_size, "PRAGMA page_size;", END) == -1LL
|| sqlite_exec_uint64_retry(&retry, &db_page_count, "PRAGMA page_count;", END) == -1LL
|| sqlite_exec_uint64_retry(&retry, &db_free_page_count, "PRAGMA freelist_count;", END) == -1LL
|| sqlite_exec_uint64_retry(&retry, &external_bytes,
"SELECT SUM(length) "
"FROM FILES "
"WHERE NOT EXISTS( "
"SELECT 1 "
"FROM FILEBLOBS "
"WHERE FILES.ID = FILEBLOBS.ID "
");", END) == -1LL
)
return WHY("Cannot measure database used bytes");
uint64_t db_used = external_bytes + db_page_size * (db_page_count - db_free_page_count);
const uint64_t limit = store_space_limit(db_used);
if (bytes && bytes >= limit){
if (config.debug.rhizome)
DEBUGF("Not enough space for %"PRIu64". Used; %"PRIu64" = %"PRIu64" + %"PRIu64" * (%"PRIu64" - %"PRIu64"), Limit; %"PRIu64,
bytes, db_used, external_bytes, db_page_size, db_page_count, db_free_page_count, limit);
return RHIZOME_PAYLOAD_STATUS_TOO_BIG;
}
// vacuum database pages if we're already using too much free space
if (external_bytes + db_page_size * db_page_count > limit)
rhizome_vacuum_db(&retry);
// If there is enough space, do nothing
if (db_used + bytes <= limit)
return RHIZOME_PAYLOAD_STATUS_NEW;
// penalise new things by 10 minutes to reduce churn
time_ms_t cost = gettime_ms() - 60000 - bytes;
// query files by age, penalise larger files so they are removed earlier
sqlite3_stmt *statement = sqlite_prepare_bind(&retry,
"SELECT id, length, inserttime FROM FILES ORDER BY (inserttime - length)",
END);
if (!statement)
return RHIZOME_PAYLOAD_STATUS_ERROR;
int r=0;
while (db_used + bytes > limit && (r=sqlite_step_retry(&retry, statement)) == SQLITE_ROW) {
const char *id=(const char *) sqlite3_column_text(statement, 0);
uint64_t length = sqlite3_column_int(statement, 1);
time_ms_t inserttime = sqlite3_column_int64(statement, 2);
time_ms_t cost_existing = inserttime - length;
if (config.debug.rhizome)
DEBUGF("Considering dropping file %s, size %"PRId64" cost %"PRId64" vs %"PRId64" to add %"PRId64" new bytes",
id, length, cost, cost_existing, bytes);
// don't allow the new file, we've got more important things to store
if (bytes && cost < cost_existing)
break;
// drop the existing content and recalculate used space
if (rhizome_delete_external(id)==0)
external_bytes -= length;
sqlite3_stmt *s = sqlite_prepare_bind(&retry, "DELETE FROM fileblobs WHERE id = ?", STATIC_TEXT, id, END);
if (s)
sqlite_exec_retry(&retry, s);
s = sqlite_prepare_bind(&retry, "DELETE FROM files WHERE id = ?", STATIC_TEXT, id, END);
if (s)
sqlite_exec_retry(&retry, s);
sqlite_exec_uint64_retry(&retry, &db_page_count, "PRAGMA page_count;", END);
sqlite_exec_uint64_retry(&retry, &db_free_page_count, "PRAGMA freelist_count;", END);
if (report)
report->deleted_expired_files++;
db_used = external_bytes + db_page_size * (db_page_count - db_free_page_count);
}
sqlite3_finalize(statement);
rhizome_vacuum_db(&retry);
if (db_used + bytes <= limit)
return RHIZOME_PAYLOAD_STATUS_NEW;
if (sqlite_code_ok(r)){
if (config.debug.rhizome)
DEBUGF("Not enough space for %"PRIu64". Used; %"PRIu64" = %"PRIu64" + %"PRIu64" * (%"PRIu64" - %"PRIu64"), Limit; %"PRIu64,
bytes, db_used, external_bytes, db_page_size, db_page_count, db_free_page_count, limit);
return RHIZOME_PAYLOAD_STATUS_EVICTED;
}
return RHIZOME_PAYLOAD_STATUS_ERROR;
}
int rhizome_store_cleanup(struct rhizome_cleanup_report *report)
{
return store_make_space(0, report);
}
enum rhizome_payload_status rhizome_open_write(struct rhizome_write *write, const rhizome_filehash_t *expectedHashp, uint64_t file_length)
{
if (file_length == 0)
return RHIZOME_PAYLOAD_STATUS_EMPTY;
write->blob_fd=-1;
write->sql_blob=NULL;
if (expectedHashp){
if (rhizome_exists(expectedHashp))
return RHIZOME_PAYLOAD_STATUS_STORED;
write->id = *expectedHashp;
write->id_known=1;
}else{
write->id_known=0;
}
if (file_length!=RHIZOME_SIZE_UNSET){
enum rhizome_payload_status status = store_make_space(file_length, NULL);
if (status != RHIZOME_PAYLOAD_STATUS_NEW)
return status;
}
static unsigned id=0;
write->temp_id = (getpid()<<16) + id++;
write->file_length = file_length;
write->file_offset = 0;
write->written_offset = 0;
SHA512_Init(&write->sha512_context);
return RHIZOME_PAYLOAD_STATUS_NEW;
}
/* blob_open / close will lock the database, this is bad for other processes that might attempt to
* use it at the same time. However, opening a blob has about O(n^2) performance.
* */
// encrypt and hash data, data buffers must be passed in file order.
static int prepare_data(struct rhizome_write *write_state, uint8_t *buffer, size_t data_size)
{
if (data_size <= 0)
return WHY("No content supplied");
/* Make sure we aren't being asked to write more data than we expected */
if ( write_state->file_length != RHIZOME_SIZE_UNSET
&& write_state->file_offset + data_size > write_state->file_length
)
return WHYF("Too much content supplied, %"PRIu64" + %zu > %"PRIu64,
write_state->file_offset, data_size, write_state->file_length);
if (write_state->crypt){
if (rhizome_crypt_xor_block(
buffer, data_size,
write_state->file_offset + write_state->tail,
write_state->key, write_state->nonce))
return -1;
}
SHA512_Update(&write_state->sha512_context, buffer, data_size);
write_state->file_offset+=data_size;
if (config.debug.rhizome_store)
DEBUGF("Processed %"PRIu64" of %"PRIu64, write_state->file_offset, write_state->file_length);
return 0;
}
// open database locks
static int write_get_lock(struct rhizome_write *write_state)
{
sqlite_retry_state retry = SQLITE_RETRY_STATE_DEFAULT;
if (write_state->blob_fd != -1 || write_state->sql_blob)
return 0;
if (write_state->file_length == RHIZOME_SIZE_UNSET ||
write_state->file_length > config.rhizome.max_blob_size){
char blob_path[1024];
if (!FORMF_RHIZOME_STORE_PATH(blob_path, "%s/%"PRIu64, RHIZOME_BLOB_SUBDIR, write_state->temp_id))
return -1;
if (config.debug.rhizome_store)
DEBUGF("Attempting to put blob for id='%"PRIu64"' in %s", write_state->temp_id, blob_path);
if ((write_state->blob_fd = open(blob_path, O_CREAT | O_TRUNC | O_RDWR, 0664)) == -1) {
WHYF("Failed to create payload file, id='%"PRIu64"'", write_state->temp_id);
return -1;
}
if (config.debug.rhizome_store)
DEBUGF("Writing to new blob file %s (fd=%d)", blob_path, write_state->blob_fd);
}else{
// use an explicit transaction so we can delay I/O failures until COMMIT so they can be retried.
if (sqlite_exec_void_retry(&retry, "BEGIN TRANSACTION;", END) == -1)
return -1;
if (write_state->blob_rowid == 0){
write_state->blob_rowid = rhizome_create_fileblob(&retry, write_state->temp_id, write_state->file_length);
if (write_state->blob_rowid == 0)
goto fail;
}
if (sqlite_blob_open_retry(&retry, "main", "FILEBLOBS", "data", write_state->blob_rowid, 1 /* read/write */, &write_state->sql_blob) == -1)
goto fail;
}
return 0;
fail:
sqlite_exec_void_retry(&retry, "ROLLBACK;", END);
return -1;
}
// write data to disk
static int write_data(struct rhizome_write *write_state, uint64_t file_offset, uint8_t *buffer, size_t data_size)
{
if (config.debug.rhizome_store)
DEBUGF("write_state->file_length=%"PRIu64" file_offset=%"PRIu64, write_state->file_length, file_offset);
if (data_size<=0)
return 0;
if (file_offset != write_state->written_offset)
WARNF("Writing file data out of order! [%"PRId64",%"PRId64"]", file_offset, write_state->written_offset);
if (write_state->blob_fd != -1) {
size_t ofs = 0;
// keep trying until all of the data is written.
if (lseek64(write_state->blob_fd, (off64_t) file_offset, SEEK_SET) == -1)
return WHYF_perror("lseek64(%d,%"PRIu64",SEEK_SET)", write_state->blob_fd, file_offset);
while (ofs < data_size){
ssize_t r = write(write_state->blob_fd, buffer + ofs, (size_t)(data_size - ofs));
if (r == -1)
return WHY_perror("write");
if (config.debug.rhizome_store)
DEBUGF("Wrote %zd bytes to fd %d", (size_t)r, write_state->blob_fd);
ofs += (size_t)r;
}
}else{
if (!write_state->sql_blob)
return WHY("Must call write_get_lock() before write_data()");
sqlite_retry_state retry = SQLITE_RETRY_STATE_DEFAULT;
if (sqlite_blob_write_retry(&retry, write_state->sql_blob, buffer, data_size, file_offset) == -1)
return -1;
}
write_state->written_offset = file_offset + data_size;
if (config.debug.rhizome_store)
DEBUGF("Wrote %"PRIu64" of %"PRIu64, file_offset + data_size, write_state->file_length);
return 0;
}
// close database locks
static int write_release_lock(struct rhizome_write *write_state)
{
int ret=0;
if (write_state->sql_blob){
ret = sqlite_blob_close(write_state->sql_blob);
sqlite_retry_state retry = SQLITE_RETRY_STATE_DEFAULT;
if (sqlite_exec_void_retry(&retry, "COMMIT;", END) == -1)
ret=-1;
write_state->sql_blob=NULL;
}
return ret;
}
// Write data buffers in any order, the data will be cached and streamed into the database in file order.
// Though there is an upper bound on the amount of cached data
int rhizome_random_write(struct rhizome_write *write_state, uint64_t offset, uint8_t *buffer, size_t data_size)
{
if (config.debug.rhizome_store)
DEBUGF("write_state->file_length=%"PRIu64" offset=%"PRIu64, write_state->file_length, offset);
if ( write_state->file_length != RHIZOME_SIZE_UNSET
&& offset >= write_state->file_length)
return 0;
if ( write_state->file_length != RHIZOME_SIZE_UNSET
&& offset + data_size > write_state->file_length)
data_size = write_state->file_length - offset;
struct rhizome_write_buffer **ptr = &write_state->buffer_list;
int ret=0;
int should_write = 0;
// if we are writing to a file, or already have the sql blob open, or are finishing, write as much
// as we can.
if (write_state->blob_fd != -1 ||
write_state->sql_blob ||
buffer == NULL ||
write_state->file_length > config.rhizome.max_blob_size ||
write_state->file_offset > config.rhizome.max_blob_size) {
should_write = 1;
if (config.debug.rhizome_store)
DEBUGF("Attempting to write (fd=%d, blob=%p, buffer=%p, len=%"PRId64", offset=%"PRId64")",
write_state->blob_fd, write_state->sql_blob, buffer,
write_state->file_length, write_state->file_offset);
} else {
// cache up to RHIZOME_BUFFER_MAXIMUM_SIZE or file length before attempting to write everything in one go.
// (Not perfect if the range overlaps)
uint64_t new_size = write_state->written_offset + write_state->buffer_size + data_size;
if ( (write_state->file_length != RHIZOME_SIZE_UNSET && new_size >= write_state->file_length)
|| new_size >= RHIZOME_BUFFER_MAXIMUM_SIZE
)
should_write = 1;
}
uint64_t last_offset = write_state->written_offset;
while(1){
// can we process this existing data block now?
if (*ptr && (*ptr)->offset == write_state->file_offset){
if (prepare_data(write_state, (*ptr)->data, (*ptr)->data_size)){
ret=-1;
break;
}
}
// if existing data should be written, do so now
if (should_write && *ptr && (*ptr)->offset == write_state->written_offset){
struct rhizome_write_buffer *n=*ptr;
if (write_get_lock(write_state)){
ret=-1;
break;
}
if (write_data(write_state, n->offset, n->data, n->data_size)){
ret=-1;
break;
}
write_state->buffer_size-=n->data_size;
last_offset = n->offset + n->data_size;
*ptr=n->_next;
free(n);
continue;
}
// skip over incoming data that we've already received
if (offset < last_offset){
uint64_t delta = last_offset - offset;
if (delta >= data_size)
break;
data_size -= delta;
offset+=delta;
buffer+=delta;
}
// no new data? we can just stop now.
if (data_size<=0)
break;
if (!*ptr || offset < (*ptr)->offset){
// found the insert position in the list
size_t size = data_size;
// allow for buffers to overlap, we may need to split the incoming buffer into multiple pieces.
if (*ptr && offset+size > (*ptr)->offset)
size = (*ptr)->offset - offset;
// should we process the incoming data block now?
if (offset == write_state->file_offset){
if (prepare_data(write_state, buffer, size)){
ret=-1;
break;
}
}
if (should_write && offset == write_state->written_offset){
if (write_get_lock(write_state)){
ret=-1;
break;
}
if (write_data(write_state, offset, buffer, size)){
ret=-1;
break;
}
// we need to go around the loop again to re-test if this buffer can now be written
}else{
// impose a limit on the total amount of cached data
if (write_state->buffer_size + size > RHIZOME_BUFFER_MAXIMUM_SIZE)
size = RHIZOME_BUFFER_MAXIMUM_SIZE - write_state->buffer_size;
if (size<=0)
break;
if (config.debug.rhizome_store)
DEBUGF("Caching block @%"PRId64", %zu", offset, size);
struct rhizome_write_buffer *i = emalloc(size + sizeof(struct rhizome_write_buffer));
if (!i){
ret=-1;
break;
}
i->offset = offset;
i->buffer_size = i->data_size = size;
bcopy(buffer, i->data, size);
i->_next = *ptr;
write_state->buffer_size += size;
*ptr = i;
// if there's any overlap of this buffer and the current one, we may need to add another buffer.
ptr = &((*ptr)->_next);
}
data_size -= size;
offset+=size;
buffer+=size;
continue;
}
last_offset = (*ptr)->offset + (*ptr)->data_size;
ptr = &((*ptr)->_next);
}
if (write_release_lock(write_state))
ret=-1;
return ret;
}
int rhizome_write_buffer(struct rhizome_write *write_state, uint8_t *buffer, size_t data_size)
{
return rhizome_random_write(write_state, write_state->file_offset, buffer, data_size);
}
/* If file_length is known, then expects file to be at least file_length in size, ignoring anything
* longer than that. Returns 0 if successful, -1 if error (logged).
*/
int rhizome_write_file(struct rhizome_write *write, const char *filename)
{
int fd = open(filename, O_RDONLY);
if (fd == -1)
return WHYF_perror("open(%s,O_RDONLY)", alloca_str_toprint(filename));
unsigned char buffer[RHIZOME_CRYPT_PAGE_SIZE];
int ret=0;
while (write->file_length == RHIZOME_SIZE_UNSET || write->file_offset < write->file_length) {
size_t size = sizeof buffer;
if (write->file_length != RHIZOME_SIZE_UNSET && write->file_offset + size > write->file_length)
size = write->file_length - write->file_offset;
ssize_t r = read(fd, buffer, size);
if (r == -1) {
ret = WHYF_perror("read(%d,%p,%zu)", fd, buffer, size);
break;
}
if (write->file_length != RHIZOME_SIZE_UNSET && (size_t) r != size) {
ret = WHYF("file truncated - read(%d,%p,%zu) returned %zu", fd, buffer, size, (size_t) r);
break;
}
if (r && rhizome_write_buffer(write, buffer, (size_t) r)) {
ret = -1;
break;
}
if ((size_t) r != size)
break;
}
if (write_release_lock(write))
ret = -1;
close(fd);
return ret;
}
void rhizome_fail_write(struct rhizome_write *write)
{
if (write->blob_fd != -1){
if (config.debug.rhizome_store)
DEBUGF("Closing and removing fd %d", write->blob_fd);
close(write->blob_fd);
write->blob_fd=-1;
char blob_path[1024];
if (FORMF_RHIZOME_STORE_PATH(blob_path, "%s/%"PRIu64, RHIZOME_BLOB_SUBDIR, write->temp_id)){
unlink(blob_path);
}
}
write_release_lock(write);
if (write->blob_rowid){
sqlite_exec_void_loglevel(LOG_LEVEL_WARN, "DELETE FROM FILEBLOBS WHERE rowid = ?;",
INT64, write->blob_rowid, END);
}
while(write->buffer_list){
struct rhizome_write_buffer *n=write->buffer_list;
write->buffer_list=n->_next;
free(n);
}
}
enum rhizome_payload_status rhizome_finish_write(struct rhizome_write *write)
{
enum rhizome_payload_status status = RHIZOME_PAYLOAD_STATUS_NEW;
// Once the whole file has been processed, we should finally know its length
if (write->file_length == RHIZOME_SIZE_UNSET) {
if (config.debug.rhizome_store)
DEBUGF("Wrote %"PRIu64" bytes, set file_length", write->file_offset);
write->file_length = write->file_offset;
if (write->file_length == 0)
status = RHIZOME_PAYLOAD_STATUS_EMPTY;
else {
status = store_make_space(write->file_length, NULL);
if (status != RHIZOME_PAYLOAD_STATUS_NEW)
goto failure;
}
}
// flush out any remaining buffered pieces to disk
if (write->buffer_list){
if (rhizome_random_write(write, 0, NULL, 0)) {
status = RHIZOME_PAYLOAD_STATUS_ERROR;
goto failure;
}
if (write->buffer_list) {
WHYF("Buffer was not cleared");
status = RHIZOME_PAYLOAD_STATUS_ERROR;
goto failure;
}
}
if (write->file_offset < write->file_length) {
WHYF("Only wrote %"PRIu64" bytes, expected %"PRIu64, write->file_offset, write->file_length);
status = RHIZOME_PAYLOAD_STATUS_WRONG_SIZE;
goto failure;
}
assert(write->file_offset == write->file_length);
if (write->file_length == 0) {
// whoops, no payload, don't store anything
if (config.debug.rhizome_store)
DEBUGF("Ignoring empty write");
goto failure;
}
rhizome_filehash_t hash_out;
SHA512_Final(hash_out.binary, &write->sha512_context);
SHA512_End(&write->sha512_context, NULL);
if (write->id_known) {
if (cmp_rhizome_filehash_t(&write->id, &hash_out) != 0) {
WARNF("expected filehash=%s, got %s", alloca_tohex_rhizome_filehash_t(write->id), alloca_tohex_rhizome_filehash_t(hash_out));
status = RHIZOME_PAYLOAD_STATUS_WRONG_HASH;
goto failure;
}
} else
write->id = hash_out;
char blob_path[1024];
if (!FORMF_RHIZOME_STORE_PATH(blob_path, "%s/%"PRIu64, RHIZOME_BLOB_SUBDIR, write->temp_id)) {
WHYF("Failed to generate external blob path");
status = RHIZOME_PAYLOAD_STATUS_ERROR;
goto failure;
}
// If the payload was written into an external blob (file) but is small enough to fit into a
// SQLite blob, then copy it into a proper blob (this occurs if rhizome_open_write() was called
// with file_length == RHIZOME_SIZE_UNSET) and max_blob_size > RHIZOME_BUFFER_MAXIMUM_SIZE.
int external = 0;
if (write->blob_fd != -1) {
external = 1;
if (write->file_length <= config.rhizome.max_blob_size) {
if (config.debug.rhizome_store)
DEBUGF("Copying %zu bytes from external file %s into blob, id=%"PRIu64, (size_t)write->file_offset, blob_path, write->temp_id);
int ret = 0;
if (lseek(write->blob_fd, 0, SEEK_SET) == (off_t) -1)
ret = WHYF_perror("lseek(%d,0,SEEK_SET)", write->blob_fd);
else if ((write->blob_rowid = rhizome_copy_file_to_blob(write->blob_fd, write->temp_id, (size_t)write->file_length)) == 0)
ret = -1;
if (ret == -1) {
WHY("Failed to copy external file into blob; keeping external file");
} else {
external = 0;
if (unlink(blob_path) == -1)
WARNF_perror("unlink(%s)", alloca_str_toprint(blob_path));
}
}
if (config.debug.rhizome_store)
DEBUGF("Closing fd=%d", write->blob_fd);
close(write->blob_fd);
write->blob_fd = -1;
}
if (write_release_lock(write)) {
status = RHIZOME_PAYLOAD_STATUS_ERROR;
goto failure;
}
sqlite_retry_state retry = SQLITE_RETRY_STATE_DEFAULT;
if (rhizome_exists(&write->id)) {
// we've already got that payload, delete the new copy
if (write->blob_rowid){
sqlite_exec_void_retry_loglevel(LOG_LEVEL_WARN, &retry, "DELETE FROM FILEBLOBS WHERE rowid = ?;",
INT64, write->blob_rowid, END);
}
if (external){
if (unlink(blob_path) == -1)
WARNF_perror("unlink(%s)", alloca_str_toprint(blob_path));
}
if (config.debug.rhizome_store)
DEBUGF("Payload id=%s already present, removed id='%"PRIu64"'", alloca_tohex_rhizome_filehash_t(write->id), write->temp_id);
}else{
if (sqlite_exec_void_retry(&retry, "BEGIN TRANSACTION;", END) == -1)
goto dbfailure;
time_ms_t now = gettime_ms();
if (sqlite_exec_void_retry(
&retry,
"INSERT OR REPLACE INTO FILES(id,length,datavalid,inserttime,last_verified) VALUES(?,?,1,?,?);",
RHIZOME_FILEHASH_T, &write->id,
INT64, write->file_length,
INT64, now,
INT64, now,
END
) == -1
)
goto dbfailure;
if (external) {
char dest_path[1024];
if (!FORMF_RHIZOME_STORE_PATH(dest_path, "%s/%s", RHIZOME_BLOB_SUBDIR, alloca_tohex_rhizome_filehash_t(write->id)))
goto dbfailure;
if (rename(blob_path, dest_path) == -1) {
WHYF_perror("rename(%s, %s)", blob_path, dest_path);
goto dbfailure;
}
if (config.debug.rhizome_store)
DEBUGF("Renamed %s to %s", blob_path, dest_path);
}else{
if (sqlite_exec_void_retry(
&retry,
"UPDATE FILEBLOBS SET id = ? WHERE rowid = ?",
RHIZOME_FILEHASH_T, &write->id,
INT64, write->blob_rowid,
END
) == -1
)
goto dbfailure;
}
if (sqlite_exec_void_retry(&retry, "COMMIT;", END) == -1)
goto dbfailure;
if (config.debug.rhizome_store)
DEBUGF("Stored file %s", alloca_tohex_rhizome_filehash_t(write->id));
}
write->blob_rowid = 0;
return status;
dbfailure:
sqlite_exec_void_retry(&retry, "ROLLBACK;", END);
status = RHIZOME_PAYLOAD_STATUS_ERROR;
failure:
rhizome_fail_write(write);
return status;
}
/* Import the payload for an existing manifest with a known file size and hash. Compute the hash of
* the payload as it is imported, and when finished, check if the size and hash match the manifest.
* If the import is successful and the size and hash match, return 0. If the size or hash do not
* match, return 1. If there is an error reading the payload file or writing to the database,
* return -1.
*/
enum rhizome_payload_status rhizome_import_payload_from_file(rhizome_manifest *m, const char *filepath)
{
assert(m->filesize != RHIZOME_SIZE_UNSET);
if (m->filesize == 0)
return RHIZOME_PAYLOAD_STATUS_EMPTY;
/* Import the file first, checking the hash as we go */
struct rhizome_write write;
bzero(&write, sizeof(write));
enum rhizome_payload_status status = rhizome_open_write(&write, &m->filehash, m->filesize);
if (status != RHIZOME_PAYLOAD_STATUS_NEW)
return status;
// file payload is not in the store yet
if (rhizome_write_file(&write, filepath)){
rhizome_fail_write(&write);
return RHIZOME_PAYLOAD_STATUS_ERROR;
}
return rhizome_finish_write(&write);
}
// store a whole payload from a single buffer
enum rhizome_payload_status rhizome_import_buffer(rhizome_manifest *m, uint8_t *buffer, size_t length)
{
assert(m->filesize != RHIZOME_SIZE_UNSET);
if (m->filesize == 0)
return RHIZOME_PAYLOAD_STATUS_EMPTY;
if (length != m->filesize) {
WHYF("Expected %"PRIu64" bytes, got %zu", m->filesize, length);
return RHIZOME_PAYLOAD_STATUS_WRONG_SIZE;
}
/* Import the file first, checking the hash as we go */
struct rhizome_write write;
bzero(&write, sizeof(write));
enum rhizome_payload_status status = rhizome_open_write(&write, &m->filehash, m->filesize);
if (status != RHIZOME_PAYLOAD_STATUS_NEW)
return status;
// file payload is not in the store yet
if (rhizome_write_buffer(&write, buffer, length)){
rhizome_fail_write(&write);
return RHIZOME_PAYLOAD_STATUS_ERROR;
}
return rhizome_finish_write(&write);
}
/* Checks the size of the file with the given path as a candidate payload for an existing manifest.
* An empty path (zero length) is taken to mean empty payload (size = 0). If the manifest's
* 'filesize' is not yet set, then sets the manifest's 'filesize' to the size of the file and
* returns 0. Otherwise, if the file's size equals the 'filesize' in the manifest, return 0. If
* the file size does not match the manifest's 'filesize', returns 1. If there is an error calling
* stat(2) on the payload file (eg, file does not exist), returns -1.
*/
enum rhizome_payload_status rhizome_stat_payload_file(rhizome_manifest *m, const char *filepath)
{
uint64_t size = 0;
if (filepath[0]) {
struct stat stat;
if (lstat(filepath, &stat)) {
WHYF_perror("lstat(%s)", alloca_str_toprint(filepath));
return RHIZOME_PAYLOAD_STATUS_ERROR;
}
size = stat.st_size;
}
if (m->filesize == RHIZOME_SIZE_UNSET)
rhizome_manifest_set_filesize(m, size);
else if (size != m->filesize) {
if (config.debug.rhizome_store)
DEBUGF("payload file %s (size=%"PRIu64") does not match manifest[%d].filesize=%"PRIu64,
alloca_str_toprint(filepath), size, m->manifest_record_number, m->filesize);
return RHIZOME_PAYLOAD_STATUS_WRONG_SIZE;
}
return size ? RHIZOME_PAYLOAD_STATUS_NEW : RHIZOME_PAYLOAD_STATUS_EMPTY;
}
static enum rhizome_payload_status rhizome_write_derive_key(rhizome_manifest *m, struct rhizome_write *write)
{
if (m->payloadEncryption != PAYLOAD_ENCRYPTED)
return RHIZOME_PAYLOAD_STATUS_NEW;
// if the manifest specifies encryption, make sure we can generate the payload key and encrypt the
// contents as we go
if (!rhizome_derive_payload_key(m))
return RHIZOME_PAYLOAD_STATUS_CRYPTO_FAIL;
if (config.debug.rhizome_store)
DEBUGF("Encrypting payload contents for bid=%s, version=%"PRIu64,
alloca_tohex_rhizome_bid_t(m->cryptoSignPublic), m->version);
write->crypt=1;
if (m->is_journal && m->tail > 0)
write->tail = m->tail;
bcopy(m->payloadKey, write->key, sizeof(write->key));
bcopy(m->payloadNonce, write->nonce, sizeof(write->nonce));
return RHIZOME_PAYLOAD_STATUS_NEW;
}
enum rhizome_payload_status rhizome_write_open_manifest(struct rhizome_write *write, rhizome_manifest *m)
{
enum rhizome_payload_status status = rhizome_open_write(
write,
m->has_filehash ? &m->filehash : NULL,
m->filesize
);
if (status == RHIZOME_PAYLOAD_STATUS_NEW)
status = rhizome_write_derive_key(m, write);
return status;
}
// import a file for a new bundle with an unknown file hash
// update the manifest with the details of the file
enum rhizome_payload_status rhizome_store_payload_file(rhizome_manifest *m, const char *filepath)
{
// Stream the file directly into the database, encrypting & hashing as we go.
struct rhizome_write write;
bzero(&write, sizeof(write));
enum rhizome_payload_status status = rhizome_write_open_manifest(&write, m);
int status_ok = 0;
switch (status) {
case RHIZOME_PAYLOAD_STATUS_EMPTY:
case RHIZOME_PAYLOAD_STATUS_NEW:
status_ok = 1;
break;
case RHIZOME_PAYLOAD_STATUS_STORED:
case RHIZOME_PAYLOAD_STATUS_TOO_BIG:
case RHIZOME_PAYLOAD_STATUS_EVICTED:
case RHIZOME_PAYLOAD_STATUS_ERROR:
case RHIZOME_PAYLOAD_STATUS_WRONG_SIZE:
case RHIZOME_PAYLOAD_STATUS_WRONG_HASH:
case RHIZOME_PAYLOAD_STATUS_CRYPTO_FAIL:
return status;
}
if (!status_ok)
FATALF("rhizome_write_open_manifest() returned status = %d", status);
if (rhizome_write_file(&write, filepath) == -1) {
rhizome_fail_write(&write);
return RHIZOME_PAYLOAD_STATUS_ERROR;
}
status = rhizome_finish_write(&write);
switch (status) {
case RHIZOME_PAYLOAD_STATUS_EMPTY:
assert(write.file_length == 0);
assert(m->filesize == 0);
return status;
case RHIZOME_PAYLOAD_STATUS_NEW:
assert(m->filesize == write.file_length);
if (m->has_filehash)
assert(cmp_rhizome_filehash_t(&m->filehash, &write.id) == 0);
else
rhizome_manifest_set_filehash(m, &write.id);
return status;
case RHIZOME_PAYLOAD_STATUS_ERROR:
case RHIZOME_PAYLOAD_STATUS_STORED:
case RHIZOME_PAYLOAD_STATUS_WRONG_SIZE:
case RHIZOME_PAYLOAD_STATUS_WRONG_HASH:
case RHIZOME_PAYLOAD_STATUS_CRYPTO_FAIL:
case RHIZOME_PAYLOAD_STATUS_TOO_BIG:
case RHIZOME_PAYLOAD_STATUS_EVICTED:
return status;
}
FATALF("rhizome_finish_write() returned status = %d", status);
}
/* Return RHIZOME_PAYLOAD_STATUS_STORED if file blob found, RHIZOME_PAYLOAD_STATUS_NEW if not found.
*/
enum rhizome_payload_status rhizome_open_read(struct rhizome_read *read, const rhizome_filehash_t *hashp)
{
read->id = *hashp;
read->blob_rowid = 0;
read->blob_fd = -1;
read->verified = 0;
read->offset = 0;
read->hash_offset = 0;
if (sqlite_exec_uint64(&read->length,"SELECT length FROM FILES WHERE id = ?",
RHIZOME_FILEHASH_T, &read->id, END) == -1)
return RHIZOME_PAYLOAD_STATUS_ERROR;
if (sqlite_exec_uint64(&read->blob_rowid,
"SELECT rowid "
"FROM FILEBLOBS "
"WHERE id = ?", RHIZOME_FILEHASH_T, &read->id, END) == -1)
return RHIZOME_PAYLOAD_STATUS_ERROR;
if (read->blob_rowid == 0) {
// No row in FILEBLOBS, look for an external blob file.
char blob_path[1024];
if (!FORMF_RHIZOME_STORE_PATH(blob_path, "%s/%s", RHIZOME_BLOB_SUBDIR, alloca_tohex_rhizome_filehash_t(read->id)))
return RHIZOME_PAYLOAD_STATUS_ERROR;
read->blob_fd = open(blob_path, O_RDONLY);
if (read->blob_fd == -1) {
if (errno == ENOENT) {
if (config.debug.rhizome_store)
DEBUGF("Stored file does not exist: %s", blob_path);
// make sure we remove an orphan file row
rhizome_delete_file(&read->id);
return RHIZOME_PAYLOAD_STATUS_NEW;
}
WHYF_perror("open(%s)", alloca_str_toprint(blob_path));
return RHIZOME_PAYLOAD_STATUS_ERROR;
}
off64_t pos = lseek64(read->blob_fd, 0, SEEK_END);
if (pos == -1) {
WHYF_perror("lseek64(%s,0,SEEK_END)", alloca_str_toprint(blob_path));
return RHIZOME_PAYLOAD_STATUS_ERROR;
}
if (read->length != (uint64_t)pos){
WHYF("Length mismatch");
return RHIZOME_PAYLOAD_STATUS_ERROR;
}
if (config.debug.rhizome_store)
DEBUGF("Opened stored file %s as fd %d, len %"PRIx64, blob_path, read->blob_fd, read->length);
}
SHA512_Init(&read->sha512_context);
return RHIZOME_PAYLOAD_STATUS_STORED;
}
static ssize_t rhizome_read_retry(sqlite_retry_state *retry, struct rhizome_read *read_state, unsigned char *buffer, size_t bufsz)
{
IN();
if (read_state->blob_fd != -1) {
if (lseek64(read_state->blob_fd, (off64_t) read_state->offset, SEEK_SET) == -1)
RETURN(WHYF_perror("lseek64(%d,%"PRIu64",SEEK_SET)", read_state->blob_fd, read_state->offset));
if (bufsz == 0)
RETURN(0);
ssize_t rd = read(read_state->blob_fd, buffer, bufsz);
if (rd == -1)
RETURN(WHYF_perror("read(%d,%p,%zu)", read_state->blob_fd, buffer, bufsz));
if (config.debug.rhizome_store)
DEBUGF("Read %zu bytes from fd=%d @%"PRIx64, (size_t) rd, read_state->blob_fd, read_state->offset);
RETURN(rd);
}
if (read_state->blob_rowid == 0)
RETURN(WHY("blob not created"));
sqlite3_blob *blob = NULL;
if (sqlite_blob_open_retry(retry, "main", "FILEBLOBS", "data", read_state->blob_rowid, 0 /* read only */, &blob) == -1)
RETURN(WHY("blob open failed"));
assert(blob != NULL);
assert(read_state->length == (uint64_t)sqlite3_blob_bytes(blob));
// A NULL buffer skips the actual sqlite3_blob_read() call, which is useful just to work out
// the length.
size_t bytes_read = 0;
if (buffer && bufsz && read_state->offset < read_state->length) {
bytes_read = (size_t)(read_state->length - read_state->offset);
if (bytes_read > bufsz)
bytes_read = bufsz;
assert(bytes_read > 0);
int ret;
do {
ret = sqlite3_blob_read(blob, buffer, (int) bytes_read, read_state->offset);
} while (sqlite_code_busy(ret) && sqlite_retry(retry, "sqlite3_blob_read"));
if (ret != SQLITE_OK) {
WHYF("sqlite3_blob_read() failed: %s", sqlite3_errmsg(rhizome_db));
sqlite_blob_close(blob);
RETURN(-1);
}
}
sqlite_blob_close(blob);
RETURN(bytes_read);
OUT();
}
/* Read content from the store, hashing and decrypting as we go.
Random access is supported, but hashing requires all payload contents to be read sequentially. */
// returns the number of bytes read
ssize_t rhizome_read(struct rhizome_read *read_state, unsigned char *buffer, size_t buffer_length)
{
IN();
// hash check failed, just return an error
if (read_state->verified == -1)
RETURN(-1);
sqlite_retry_state retry = SQLITE_RETRY_STATE_DEFAULT;
ssize_t n = rhizome_read_retry(&retry, read_state, buffer, buffer_length);
if (n == -1)
RETURN(-1);
size_t bytes_read = (size_t) n;
// hash the payload as we go, but only if we happen to read the payload data in order
if (read_state->hash_offset == read_state->offset && buffer && bytes_read>0){
SHA512_Update(&read_state->sha512_context, buffer, bytes_read);
read_state->hash_offset += bytes_read;
// if we hash everything and the hash doesn't match, we need to delete the payload
if (read_state->hash_offset >= read_state->length){
rhizome_filehash_t hash_out;
SHA512_Final(hash_out.binary, &read_state->sha512_context);
SHA512_End(&read_state->sha512_context, NULL);
if (cmp_rhizome_filehash_t(&read_state->id, &hash_out) != 0) {
// hash failure, mark the payload as invalid
read_state->verified = -1;
RETURN(WHYF("Expected hash=%s, got %s", alloca_tohex_rhizome_filehash_t(read_state->id), alloca_tohex_rhizome_filehash_t(hash_out)));
}else{
// we read it, and it's good. Lets remember that (not fatal if the database is locked)
read_state->verified = 1;
}
}
}
if (read_state->crypt && buffer && bytes_read>0){
if(rhizome_crypt_xor_block(
buffer, bytes_read,
read_state->offset + read_state->tail,
read_state->key, read_state->nonce)){
RETURN(-1);
}
}
read_state->offset += bytes_read;
if (config.debug.rhizome_store)
DEBUGF("read %zu bytes, read_state->offset=%"PRIu64, bytes_read, read_state->offset);
RETURN(bytes_read);
OUT();
}
/* Read len bytes from read->offset into data, using *buffer to cache any reads */
ssize_t rhizome_read_buffered(struct rhizome_read *read, struct rhizome_read_buffer *buffer, unsigned char *data, size_t len)
{
size_t bytes_copied=0;
while (len>0){
//DEBUGF("len=%zu read->length=%"PRIu64" read->offset=%"PRIu64" buffer->offset=%"PRIu64"", len, read->length, read->offset, buffer->offset);
// make sure we only attempt to read data that actually exists
if (read->length != RHIZOME_SIZE_UNSET && read->offset + len > read->length)
len = read->length - read->offset;
// if we can supply either the beginning or end of the data from cache, do that first.
if (read->offset >= buffer->offset) {
assert(read->offset - buffer->offset <= SIZE_MAX);
size_t ofs = read->offset - buffer->offset;
if (ofs <= buffer->len){
size_t size = len;
if (size > buffer->len - ofs)
size = buffer->len - ofs;
if (size > 0){
// copy into the start of the data buffer
bcopy(buffer->data + ofs, data, size);
data+=size;
len-=size;
read->offset+=size;
bytes_copied+=size;
continue;
}
}
}
if (read->offset + len > buffer->offset) {
assert(read->offset + len - buffer->offset <= SIZE_MAX);
size_t ofs = read->offset + len - buffer->offset;
if (ofs <= buffer->len){
size_t size = len;
if (size > ofs)
size = ofs;
if (size>0){
// copy into the end of the data buffer
bcopy(buffer->data + ofs - size, data + len - size, size);
len-=size;
bytes_copied+=size;
continue;
}
}
}
// ok, so we need to read a new buffer to fulfill the request.
// remember the requested read offset so we can put it back
uint64_t ofs = read->offset;
buffer->offset = read->offset = ofs & ~(RHIZOME_CRYPT_PAGE_SIZE -1);
ssize_t r = rhizome_read(read, buffer->data, sizeof buffer->data);
read->offset = ofs;
buffer->len = 0;
if (r == -1)
return -1;
buffer->len = (size_t) r;
}
return bytes_copied;
}
void rhizome_read_close(struct rhizome_read *read)
{
if (read->blob_fd != -1) {
if (config.debug.rhizome_store)
DEBUGF("Closing store fd %d", read->blob_fd);
close(read->blob_fd);
read->blob_fd = -1;
}
if (read->verified==-1) {
// delete payload!
rhizome_delete_file(&read->id);
}else if(read->verified==1) {
// remember when we verified the file
time_ms_t now = gettime_ms();
sqlite_exec_void_loglevel(LOG_LEVEL_WARN,
"UPDATE FILES SET last_verified = ? WHERE id=?",
INT64, now,
RHIZOME_FILEHASH_T, &read->id,
END);
}
}
struct cache_entry{
struct cache_entry *_left;
struct cache_entry *_right;
rhizome_bid_t bundle_id;
uint64_t version;
struct rhizome_read read_state;
time_ms_t expires;
};
struct cache_entry *root;
static struct cache_entry ** find_entry_location(struct cache_entry **ptr, const rhizome_bid_t *bundle_id, uint64_t version)
{
while(*ptr){
struct cache_entry *entry = *ptr;
int cmp = cmp_rhizome_bid_t(bundle_id, &entry->bundle_id);
if (cmp==0){
if (entry->version==version)
break;
if (version < entry->version)
ptr = &entry->_left;
else
ptr = &entry->_right;
continue;
}
if (cmp<0)
ptr = &entry->_left;
else
ptr = &entry->_right;
}
return ptr;
}
static time_ms_t close_entries(struct cache_entry **entry, time_ms_t timeout)
{
if (!*entry)
return 0;
time_ms_t ret = close_entries(&(*entry)->_left, timeout);
time_ms_t t_right = close_entries(&(*entry)->_right, timeout);
if (t_right!=0 && (t_right < ret || ret==0))
ret=t_right;
if ((*entry)->expires < timeout || timeout==0){
rhizome_read_close(&(*entry)->read_state);
// remember the two children
struct cache_entry *left=(*entry)->_left;
struct cache_entry *right=(*entry)->_right;
// free this entry
free(*entry);
// re-add both children to the tree
*entry=left;
if (right){
entry = find_entry_location(entry, &right->bundle_id, right->version);
*entry=right;
}
}else{
if ((*entry)->expires < ret || ret==0)
ret=(*entry)->expires;
}
return ret;
}
// close any expired cache entries
static void rhizome_cache_alarm(struct sched_ent *alarm)
{
alarm->alarm = close_entries(&root, gettime_ms());
if (alarm->alarm){
alarm->deadline = alarm->alarm + 1000;
schedule(alarm);
}
}
static struct profile_total cache_alarm_stats={
.name="rhizome_cache_alarm",
};
static struct sched_ent cache_alarm={
.function = rhizome_cache_alarm,
.stats = &cache_alarm_stats,
};
// close all cache entries
int rhizome_cache_close()
{
close_entries(&root, 0);
unschedule(&cache_alarm);
return 0;
}
static int _rhizome_cache_count(struct cache_entry *entry)
{
if (!entry)
return 0;
return 1+_rhizome_cache_count(entry->_left)+_rhizome_cache_count(entry->_right);
}
int rhizome_cache_count()
{
return _rhizome_cache_count(root);
}
// read a block of data, caching meta data for reuse
ssize_t rhizome_read_cached(const rhizome_bid_t *bidp, uint64_t version, time_ms_t timeout, uint64_t fileOffset, unsigned char *buffer, size_t length)
{
// look for a cached entry
struct cache_entry **ptr = find_entry_location(&root, bidp, version);
struct cache_entry *entry = *ptr;
// if we don't have one yet, create one and open it
if (!entry){
rhizome_filehash_t filehash;
if (rhizome_database_filehash_from_id(bidp, version, &filehash) != 0){
if (config.debug.rhizome_store)
DEBUGF("Payload not found for bundle bid=%s version=%"PRIu64,
alloca_tohex_rhizome_bid_t(*bidp), version);
return -1;
}
entry = emalloc_zero(sizeof(struct cache_entry));
if (entry == NULL)
return -1;
enum rhizome_payload_status status = rhizome_open_read(&entry->read_state, &filehash);
switch (status) {
case RHIZOME_PAYLOAD_STATUS_EMPTY:
case RHIZOME_PAYLOAD_STATUS_STORED:
break;
case RHIZOME_PAYLOAD_STATUS_NEW:
free(entry);
return WHYF("Payload %s not found", alloca_tohex_rhizome_filehash_t(filehash));
case RHIZOME_PAYLOAD_STATUS_ERROR:
case RHIZOME_PAYLOAD_STATUS_WRONG_SIZE:
case RHIZOME_PAYLOAD_STATUS_WRONG_HASH:
case RHIZOME_PAYLOAD_STATUS_CRYPTO_FAIL:
free(entry);
return WHYF("Error opening payload %s", alloca_tohex_rhizome_filehash_t(filehash));
default:
FATALF("status = %d", status);
}
entry->bundle_id = *bidp;
entry->version = version;
*ptr = entry;
}
entry->read_state.offset = fileOffset;
if (entry->read_state.length != RHIZOME_SIZE_UNSET && fileOffset >= entry->read_state.length)
return 0;
if (entry->expires < timeout){
entry->expires = timeout;
if (!cache_alarm.alarm){
cache_alarm.alarm = timeout;
cache_alarm.deadline = timeout + 1000;
schedule(&cache_alarm);
}
}
return rhizome_read(&entry->read_state, buffer, length);
}
/* Returns -1 on error, 0 on success.
*/
static int write_file(struct rhizome_read *read, const char *filepath){
int fd=-1, ret=0;
if (filepath&&filepath[0]) {
fd = open(filepath, O_WRONLY | O_CREAT | O_TRUNC, 0775);
if (fd == -1)
return WHY_perror("open");
}
unsigned char buffer[RHIZOME_CRYPT_PAGE_SIZE];
while((ret=rhizome_read(read, buffer, sizeof(buffer)))>0){
if (fd!=-1){
if (write(fd,buffer,ret)!=ret) {
ret = WHY("Failed to write data to file");
break;
}
}
}
if (fd!=-1){
if (close(fd)==-1)
ret=WHY_perror("close");
if (ret<0){
// TODO delete partial file
}
}
return ret;
}
static enum rhizome_payload_status read_derive_key(rhizome_manifest *m, struct rhizome_read *read_state)
{
read_state->crypt = m->payloadEncryption == PAYLOAD_ENCRYPTED;
if (read_state->crypt){
// if the manifest specifies encryption, make sure we can generate the payload key and encrypt
// the contents as we go
if (!rhizome_derive_payload_key(m)) {
rhizome_read_close(read_state);
WHY("Unable to decrypt bundle, valid key not found");
return RHIZOME_PAYLOAD_STATUS_CRYPTO_FAIL;
}
if (config.debug.rhizome_store)
DEBUGF("Decrypting payload contents for bid=%s version=%"PRIu64, alloca_tohex_rhizome_bid_t(m->cryptoSignPublic), m->version);
if (m->is_journal && m->tail > 0)
read_state->tail = m->tail;
bcopy(m->payloadKey, read_state->key, sizeof(read_state->key));
bcopy(m->payloadNonce, read_state->nonce, sizeof(read_state->nonce));
}
return RHIZOME_PAYLOAD_STATUS_STORED;
}
enum rhizome_payload_status rhizome_open_decrypt_read(rhizome_manifest *m, struct rhizome_read *read_state)
{
enum rhizome_payload_status status = rhizome_open_read(read_state, &m->filehash);
if (status == RHIZOME_PAYLOAD_STATUS_STORED)
status = read_derive_key(m, read_state);
return status;
}
/* Extract the file related to a manifest to the file system. The file will be de-crypted and
* verified while reading. If filepath is not supplied, the file will still be checked.
*/
enum rhizome_payload_status rhizome_extract_file(rhizome_manifest *m, const char *filepath)
{
struct rhizome_read read_state;
bzero(&read_state, sizeof read_state);
enum rhizome_payload_status status = rhizome_open_decrypt_read(m, &read_state);
if (status == RHIZOME_PAYLOAD_STATUS_STORED) {
if (write_file(&read_state, filepath) == -1)
status = RHIZOME_PAYLOAD_STATUS_ERROR;
}
rhizome_read_close(&read_state);
return status;
}
/* dump the raw contents of a file
*/
enum rhizome_payload_status rhizome_dump_file(const rhizome_filehash_t *hashp, const char *filepath, uint64_t *lengthp)
{
struct rhizome_read read_state;
bzero(&read_state, sizeof read_state);
enum rhizome_payload_status status = rhizome_open_read(&read_state, hashp);
if (status == RHIZOME_PAYLOAD_STATUS_STORED) {
if (write_file(&read_state, filepath) == -1)
status = RHIZOME_PAYLOAD_STATUS_ERROR;
else if (lengthp)
*lengthp = read_state.length;
}
rhizome_read_close(&read_state);
return status;
}
// pipe data from one payload to another
static int rhizome_pipe(struct rhizome_read *read, struct rhizome_write *write, uint64_t length)
{
assert(write->file_offset <= write->file_length);
if (length > (uint64_t)(write->file_length - write->file_offset))
return WHY("Unable to pipe that much data");
unsigned char buffer[RHIZOME_CRYPT_PAGE_SIZE];
while(length>0){
size_t size=sizeof(buffer);
if (size > length)
size=length;
ssize_t r = rhizome_read(read, buffer, size);
if (r == -1)
return r;
length -= (size_t) r;
if (rhizome_write_buffer(write, buffer, (size_t) r))
return -1;
}
return 0;
}
uint64_t rhizome_copy_file_to_blob(int fd, uint64_t id, size_t size)
{
sqlite_retry_state retry = SQLITE_RETRY_STATE_DEFAULT;
uint64_t rowid = rhizome_create_fileblob(&retry, id, size);
if (rowid == 0)
return 0;
sqlite3_blob *blob = NULL;
if (sqlite_blob_open_retry(&retry, "main", "FILEBLOBS", "data", rowid, 1 /* read/write */, &blob) == -1)
goto fail;
char buf[16384];
size_t offset = 0;
while (offset < size) {
size_t toread = size - offset;
if (toread > sizeof buf)
toread = sizeof buf;
ssize_t nread = read(fd, buf, toread);
if (nread == -1) {
WHYF_perror("read(%d,%p,%zu)", fd, buf, toread);
goto fail;
}
if ((size_t)nread == 0) {
WHYF("read(%d,%p,%zu) returned 0", fd, buf, toread);
goto fail;
}
if (sqlite_blob_write_retry(&retry, blob, buf, (int)nread, (int)offset) == -1)
goto fail;
assert((size_t)nread <= toread);
offset += (size_t)nread;
}
assert(offset == size);
sqlite_blob_close(blob);
return rowid;
fail:
if (blob)
sqlite_blob_close(blob);
sqlite_exec_void_retry(&retry, "DELETE FROM FILEBLOBS WHERE id = ?;", UINT64_TOSTR, id, END);
return 0;
}
enum rhizome_payload_status rhizome_journal_pipe(struct rhizome_write *write, const rhizome_filehash_t *hashp, uint64_t start_offset, uint64_t length)
{
struct rhizome_read read_state;
bzero(&read_state, sizeof read_state);
enum rhizome_payload_status status = rhizome_open_read(&read_state, hashp);
if (status == RHIZOME_PAYLOAD_STATUS_STORED) {
read_state.offset = start_offset;
if (rhizome_pipe(&read_state, write, length) == -1)
status = RHIZOME_PAYLOAD_STATUS_ERROR;
}
rhizome_read_close(&read_state);
return status;
}
// open an existing journal bundle, advance the head pointer, duplicate the existing content and get ready to add more.
enum rhizome_payload_status rhizome_write_open_journal(struct rhizome_write *write, rhizome_manifest *m, uint64_t advance_by, uint64_t append_size)
{
assert(m->is_journal);
assert(m->filesize != RHIZOME_SIZE_UNSET);
assert(advance_by <= m->filesize);
uint64_t copy_length = m->filesize - advance_by;
uint64_t new_filesize = RHIZOME_SIZE_UNSET;
if (append_size != RHIZOME_SIZE_UNSET) {
assert(m->filesize + append_size > m->filesize); // no wraparound
new_filesize = m->filesize + append_size - advance_by;
}
if (advance_by > 0)
rhizome_manifest_set_tail(m, m->tail + advance_by);
enum rhizome_payload_status status = rhizome_open_write(write, NULL, new_filesize);
if (status == RHIZOME_PAYLOAD_STATUS_NEW && copy_length > 0) {
// note that we don't need to bother decrypting the existing journal payload
enum rhizome_payload_status rstatus = rhizome_journal_pipe(write, &m->filehash, advance_by, copy_length);
if (rstatus != RHIZOME_PAYLOAD_STATUS_STORED)
status = RHIZOME_PAYLOAD_STATUS_ERROR;
}
if (status == RHIZOME_PAYLOAD_STATUS_NEW)
status = rhizome_write_derive_key(m, write);
if (status != RHIZOME_PAYLOAD_STATUS_NEW)
rhizome_fail_write(write);
return status;
}
// Call to finish any write started with rhizome_write_open_journal()
static void rhizome_finish_journal(struct rhizome_write *write, rhizome_manifest *m)
{
assert(m->is_journal);
rhizome_manifest_set_filesize(m, write->file_length);
rhizome_manifest_set_version(m, write->file_length);
rhizome_manifest_set_filehash(m, &write->id);
}
enum rhizome_payload_status rhizome_append_journal_buffer(rhizome_manifest *m, uint64_t advance_by, uint8_t *buffer, size_t len)
{
struct rhizome_write write;
bzero(&write, sizeof write);
enum rhizome_payload_status status = rhizome_write_open_journal(&write, m, advance_by, (uint64_t) len);
if (status != RHIZOME_PAYLOAD_STATUS_NEW)
return status;
if (buffer && len && rhizome_write_buffer(&write, buffer, len) == -1) {
rhizome_fail_write(&write);
return RHIZOME_PAYLOAD_STATUS_ERROR;
}
status = rhizome_finish_write(&write);
if (status != RHIZOME_PAYLOAD_STATUS_NEW) {
rhizome_fail_write(&write);
return status;
}
rhizome_finish_journal(&write, m);
return status;
}
enum rhizome_payload_status rhizome_append_journal_file(rhizome_manifest *m, uint64_t advance_by, const char *filename)
{
struct stat stat;
if (lstat(filename,&stat))
return WHYF_perror("stat(%s)", alloca_str_toprint(filename));
struct rhizome_write write;
bzero(&write, sizeof write);
enum rhizome_payload_status status = rhizome_write_open_journal(&write, m, advance_by, stat.st_size);
if (status != RHIZOME_PAYLOAD_STATUS_NEW)
return status;
if (stat.st_size != 0 && rhizome_write_file(&write, filename) == -1) {
rhizome_fail_write(&write);
return RHIZOME_PAYLOAD_STATUS_ERROR;
}
status = rhizome_finish_write(&write);
if (status != RHIZOME_PAYLOAD_STATUS_NEW) {
rhizome_fail_write(&write);
return status;
}
rhizome_finish_journal(&write, m);
return status;
}
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