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#include "gossip_store.h"
#include <ccan/endian/endian.h>
#include <ccan/read_write_all/read_write_all.h>
#include <common/status.h>
#include <common/utils.h>
#include <errno.h>
#include <fcntl.h>
#include <gossipd/gen_gossip_store.h>
#include <unistd.h>
#include <wire/gen_peer_wire.h>
#include <wire/wire.h>
#define GOSSIP_STORE_FILENAME "gossip_store"
static u8 gossip_store_version = 0x01;
struct gossip_store {
int fd;
u8 version;
};
static void gossip_store_destroy(struct gossip_store *gs)
{
close(gs->fd);
}
struct gossip_store *gossip_store_new(const tal_t *ctx)
{
struct gossip_store *gs = tal(ctx, struct gossip_store);
gs->fd = open(GOSSIP_STORE_FILENAME, O_RDWR|O_APPEND|O_CREAT, 0600);
tal_add_destructor(gs, gossip_store_destroy);
/* Try to read the version, write it if this is a new file, or truncate
* if the version doesn't match */
if (read(gs->fd, &gs->version, sizeof(gs->version))
== sizeof(gs->version)) {
/* Version match? All good */
if (gs->version == gossip_store_version)
return gs;
status_unusual("Gossip store version %u not %u: removing",
gs->version, gossip_store_version);
if (ftruncate(gs->fd, 0) != 0)
status_failed(STATUS_FAIL_INTERNAL_ERROR,
"Truncating store: %s", strerror(errno));
}
/* Empty file, write version byte */
gs->version = gossip_store_version;
if (write(gs->fd, &gs->version, sizeof(gs->version))
!= sizeof(gs->version))
status_failed(STATUS_FAIL_INTERNAL_ERROR,
"Writing version to store: %s", strerror(errno));
return gs;
}
/**
* Write an incoming message to the `gossip_store`
*
* @param gs The gossip_store to write to
* @param msg The message to write
* @return The newly created and initialized `gossip_store`
*/
static void gossip_store_append(struct gossip_store *gs, const u8 *msg)
{
u32 msglen = tal_len(msg);
beint32_t belen = cpu_to_be32(msglen);
/* Only give error message once. */
if (gs->fd == -1)
return;
/* FORTIFY_SOURCE gets upset if we don't check return. */
if (write(gs->fd, &belen, sizeof(belen)) != sizeof(belen) ||
write(gs->fd, msg, msglen) != msglen) {
status_broken("Failed writing to gossip store: %s",
strerror(errno));
gs->fd = -1;
}
}
void gossip_store_add_channel_announcement(struct gossip_store *gs, const u8 *gossip_msg, u64 satoshis)
{
u8 *msg = towire_gossip_store_channel_announcement(NULL, gossip_msg, satoshis);
gossip_store_append(gs, msg);
tal_free(msg);
}
void gossip_store_add_channel_update(struct gossip_store *gs,
const u8 *gossip_msg)
{
u8 *msg = towire_gossip_store_channel_update(NULL, gossip_msg);
gossip_store_append(gs, msg);
tal_free(msg);
}
void gossip_store_add_node_announcement(struct gossip_store *gs,
const u8 *gossip_msg)
{
u8 *msg = towire_gossip_store_node_announcement(NULL, gossip_msg);
gossip_store_append(gs, msg);
tal_free(msg);
}
void gossip_store_add_channel_delete(struct gossip_store *gs,
const struct short_channel_id *scid)
{
u8 *msg = towire_gossip_store_channel_delete(NULL, scid);
gossip_store_append(gs, msg);
tal_free(msg);
}
void gossip_store_local_add_channel(struct gossip_store *gs,
const u8 *add_msg)
{
u8 *msg = towire_gossip_store_local_add_channel(NULL, add_msg);
gossip_store_append(gs, msg);
tal_free(msg);
}
void gossip_store_load(struct routing_state *rstate, struct gossip_store *gs)
{
beint32_t belen;
u32 msglen;
u8 *msg, *gossip_msg;
u64 satoshis;
struct short_channel_id scid;
/* We set/check version byte on creation */
off_t known_good = 1;
const char *bad;
size_t stats[] = {0, 0, 0, 0};
if (lseek(gs->fd, known_good, SEEK_SET) < 0) {
status_unusual("gossip_store: lseek failure");
goto truncate_nomsg;
}
while (read(gs->fd, &belen, sizeof(belen)) == sizeof(belen)) {
msglen = be32_to_cpu(belen);
msg = tal_arr(gs, u8, msglen);
if (read(gs->fd, msg, msglen) != msglen) {
status_unusual("gossip_store: truncated file?");
goto truncate_nomsg;
}
if (fromwire_gossip_store_channel_announcement(msg, msg,
&gossip_msg,
&satoshis)) {
if (!routing_add_channel_announcement(rstate,
gossip_msg,
satoshis)) {
bad = "Bad channel_announcement";
goto truncate;
}
stats[0]++;
} else if (fromwire_gossip_store_channel_update(msg, msg,
&gossip_msg)) {
if (!routing_add_channel_update(rstate, gossip_msg)) {
bad = "Bad channel_update";
goto truncate;
}
stats[1]++;
} else if (fromwire_gossip_store_node_announcement(msg, msg,
&gossip_msg)) {
if (!routing_add_node_announcement(rstate, gossip_msg)) {
bad = "Bad node_announcement";
goto truncate;
}
stats[2]++;
} else if (fromwire_gossip_store_channel_delete(msg, &scid)) {
struct chan *c = get_channel(rstate, &scid);
if (!c) {
bad = "Bad channel_delete";
goto truncate;
}
tal_free(c);
stats[3]++;
} else if (fromwire_gossip_store_local_add_channel(
msg, msg, &gossip_msg)) {
handle_local_add_channel(rstate, gossip_msg);
} else {
bad = "Unknown message";
goto truncate;
}
known_good += sizeof(belen) + msglen;
tal_free(msg);
}
goto out;
truncate:
status_unusual("gossip_store: %s (%s) truncating to %"PRIu64,
bad, tal_hex(msg, msg), (u64)1);
truncate_nomsg:
/* FIXME: We would like to truncate to known_good, except we would
* miss channel_delete msgs. If we put block numbers into the store
* as we process them, we can know how far we need to roll back if we
* truncate the store */
if (ftruncate(gs->fd, 1) != 0)
status_failed(STATUS_FAIL_INTERNAL_ERROR,
"Truncating store: %s", strerror(errno));
out:
status_trace("gossip_store: Read %zu/%zu/%zu/%zu cannounce/cupdate/nannounce/cdelete from store in %"PRIu64" bytes",
stats[0], stats[1], stats[2], stats[3],
(u64)known_good);
}