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gossipd: gossip_store_get() to load a single store entry.

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This will allow us to load on demand, and not keep all messages in
memory.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2019-04-10 17:01:29 +09:30
committed by neil saitug
parent 1f08cfb3e3
commit da845b660b
2 changed files with 66 additions and 0 deletions
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57
gossipd/gossip_store.c
View File

@@ -329,6 +329,63 @@ void gossip_store_add_channel_delete(struct gossip_store *gs,
tal_free(msg);
}
const u8 *gossip_store_get(const tal_t *ctx,
struct gossip_store *gs,
u64 offset)
{
beint32_t belen, becsum;
u32 msglen, checksum;
u8 *msg, *gossip_msg;
struct amount_sat satoshis;
if (offset == 0 || offset > gs->len)
status_failed(STATUS_FAIL_INTERNAL_ERROR,
"gossip_store: can't access offset %"PRIu64
", store len %"PRIu64,
offset, gs->len);
if (lseek(gs->fd, offset, SEEK_SET) < 0)
status_failed(STATUS_FAIL_INTERNAL_ERROR,
"gossip_store: can't seek offset %"PRIu64
", store len %"PRIu64": %s",
offset, gs->len, strerror(errno));
if (read(gs->fd, &belen, sizeof(belen)) != sizeof(belen)
|| read(gs->fd, &becsum, sizeof(becsum)) != sizeof(becsum)) {
status_failed(STATUS_FAIL_INTERNAL_ERROR,
"gossip_store: can't read hdr offset %"PRIu64
", store len %"PRIu64": %s",
offset, gs->len, strerror(errno));
}
msglen = be32_to_cpu(belen);
checksum = be32_to_cpu(becsum);
msg = tal_arr(ctx, u8, msglen);
if (read(gs->fd, msg, msglen) != msglen)
status_failed(STATUS_FAIL_INTERNAL_ERROR,
"gossip_store: can't read len %u offset %"PRIu64
", store len %"PRIu64,
msglen, offset, gs->len);
if (checksum != crc32c(0, msg, msglen))
status_failed(STATUS_FAIL_INTERNAL_ERROR,
"gossip_store: bad checksum offset %"PRIu64
", store len %"PRIu64,
offset, gs->len);
/* Now try decoding it */
if (!fromwire_gossip_store_node_announcement(ctx, msg, &gossip_msg)
&& !fromwire_gossip_store_channel_announcement(ctx, msg,
&gossip_msg,
&satoshis)
&& !fromwire_gossip_store_channel_update(ctx, msg, &gossip_msg)) {
status_failed(STATUS_FAIL_INTERNAL_ERROR,
"gossip_store: bad message %s offset %"PRIu64
" from store len %"PRIu64,
tal_hex(tmpctx, msg), offset, gs->len);
}
return gossip_msg;
}
void gossip_store_load(struct routing_state *rstate, struct gossip_store *gs)
{
beint32_t belen, becsum;

9
gossipd/gossip_store.h
View File

@@ -38,6 +38,15 @@ u64 gossip_store_add(struct gossip_store *gs, const u8 *gossip_msg);
void gossip_store_add_channel_delete(struct gossip_store *gs,
const struct short_channel_id *scid);
/**
* Direct store accessor: loads gossip msg back from store.
*
* Caller must ensure offset != 0. Never returns NULL.
*/
const u8 *gossip_store_get(const tal_t *ctx,
struct gossip_store *gs,
u64 offset);
/**
* If we need to compact the gossip store, do so.
* @gs: the gossip store.