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feerates: new command to inject/query fee estimates.

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This is useful mainly in the case where bitcoind is not giving estimates,
but can also be used to bias results if you want.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2018-08-24 11:52:02 +09:30
parent 9d37b78088
commit c7c5affa3f
4 changed files with 135 additions and 1 deletions
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79
lightningd/chaintopology.c
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@@ -20,6 +20,7 @@
#include <lightningd/channel_control.h>
#include <lightningd/gossip_control.h>
#include <lightningd/json.h>
#include <lightningd/jsonrpc_errors.h>
#include <lightningd/param.h>
/* Mutual recursion via timer. */
@@ -388,6 +389,84 @@ static void start_fee_estimate(struct chain_topology *topo)
update_feerates, topo);
}
static void json_feerates(struct command *cmd,
const char *buffer, const jsmntok_t *params)
{
struct chain_topology *topo = cmd->ld->topology;
struct json_result *response;
u32 *urgent, *normal, *slow, feerates[NUM_FEERATES];
bool missing;
const jsmntok_t *style;
bool bitcoind_style;
if (!param(cmd, buffer, params,
p_req("style", json_tok_tok, &style),
p_opt("urgent", json_tok_number, &urgent),
p_opt("normal", json_tok_number, &normal),
p_opt("slow", json_tok_number, &slow),
NULL))
return;
/* update_feerates uses 0 as "don't know" */
feerates[FEERATE_URGENT] = urgent ? *urgent : 0;
feerates[FEERATE_NORMAL] = normal ? *normal : 0;
feerates[FEERATE_SLOW] = slow ? *slow : 0;
if (json_tok_streq(buffer, style, "sipa"))
bitcoind_style = false;
else if (json_tok_streq(buffer, style, "bitcoind")) {
/* Everyone uses satoshi per kbyte, but we use satoshi per ksipa
* (don't round down to zero though)! */
for (size_t i = 0; i < ARRAY_SIZE(feerates); i++)
feerates[i] = (feerates[i] + 3) / 4;
bitcoind_style = true;
} else {
command_fail(cmd, JSONRPC2_INVALID_PARAMS, "invalid style");
return;
}
log_info(topo->log,
"feerates: inserting feerates in sipa/kb %u/%u/%u",
feerates[FEERATE_URGENT],
feerates[FEERATE_NORMAL],
feerates[FEERATE_SLOW]);
update_feerates(topo->bitcoind, feerates, topo);
missing = false;
for (size_t i = 0; i < ARRAY_SIZE(feerates); i++) {
feerates[i] = try_get_feerate(topo, i);
if (!feerates[i])
missing = true;
if (bitcoind_style)
feerates[i] *= 4;
}
response = new_json_result(cmd);
json_object_start(response, NULL);
json_object_start(response, bitcoind_style ? "bitcoind" : "sipa");
for (size_t i = 0; i < ARRAY_SIZE(feerates); i++) {
if (!feerates[i])
continue;
json_add_num(response, feerate_name(i), feerates[i]);
}
json_object_end(response);
if (missing)
json_add_string(response, "warning",
"Some fee estimates unavailable: bitcoind startup?");
json_object_end(response);
command_success(cmd, response);
}
static const struct json_command feerates_command = {
"feerates",
json_feerates,
"Add/query feerate estimates, either satoshi-per-kw ({style} sipa) or satoshi-per-kb ({style} bitcoind) for {urgent}, {normal} and {slow}."
};
AUTODATA(json_command, &feerates_command);
static void next_updatefee_timer(struct chain_topology *topo)
{
/* This takes care of its own lifetime. */