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Use the long-poll client for the startup ping and initial GBT (slow/large templates) #75

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Use the long-poll client for the startup ping and initial GBT (slow/large templates) #75

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66d7264
Startup ping uses the long-poll client (enforcer GBT > 10s)
mblowes Sep 3, 2026
d093a28
Initial GBT uses the long-poll client too
mblowes Sep 3, 2026
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20 changes: 16 additions & 4 deletions src/main.c
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Original file line number Diff line number Diff line change
Expand Up @@ -953,11 +953,21 @@ int main(int argc, char **argv) {
/* The ping is a getblockchaininfo sanity check. Some block-template
* backends that accept unauthenticated JSON-RPC don't implement it, so
* skip the ping when no credentials are configured — the initial
* getblocktemplate below still validates connectivity. */
* getblocktemplate below still validates connectivity.
*
* It goes through the long-poll client, not the 10s general-purpose one:
* on a backend without getblockchaininfo (the CUSF enforcer) the ping
* falls back to a full getblocktemplate, and that response is a multi-MB
* template that takes longer than 10s once the mempool fills (10.5–13.5s
* measured live on alphanet). With the short client the pool exits 3 at
* startup — "bitcoind ping failed: curl: Timeout was reached" — and a
* relaunch loop just flaps until a template happens to come back fast.
* The tip watcher already fetches every template with this client. */
if (cfg.bitcoind_user[0] != '\0' || cfg.bitcoind_pass[0] != '\0') {
if (bitcoind_ping(&btc, err, sizeof err) < 0) {
if (bitcoind_ping(&btc_lp, err, sizeof err) < 0) {
fprintf(stderr, "bitcoind ping failed: %s\n", err);
bitcoind_client_free(&btc);
bitcoind_client_free(&btc_lp);
return 3;
}
LOG_INFO("bitcoind ping ok");
Expand Down Expand Up @@ -1056,9 +1066,11 @@ int main(int argc, char **argv) {
bcast = NULL;
}

/* Initial template + job. */
/* Initial template + job. Same client as the ping and the tip watcher:
* a live template can take longer than the 10s general-purpose client
* allows (see the ping above), and exiting 5 here is the same flap. */
bitcoind_template_t *tmpl = NULL;
if (bitcoind_get_block_template(&btc, &tmpl, err, sizeof err) < 0) {
if (bitcoind_get_block_template(&btc_lp, &tmpl, err, sizeof err) < 0) {
fprintf(stderr, "initial GBT failed: %s\n", err);
store_close(store);
bitcoind_client_free(&btc);
Expand Down