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lightningd: format JSON directly into json connection membuf.

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My test case is a mainnet gossip store with 22107 channels, and
time to do `lightning-cli listchannels`:

Before: `lightning-cli listchannels` DEVELOPER=0
	real	0m1.303000-1.324000(1.3114+/-0.0091)s

After:
	real	0m0.629000-0.695000(0.64985+/-0.019)s

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2018-10-19 11:47:48 +10:30
parent 03e7be5bce
commit c403415caa
9 changed files with 179 additions and 152 deletions
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8
lightningd/jsonrpc.h
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@@ -7,6 +7,7 @@
#include <ccan/membuf/membuf.h>
#include <common/io_lock.h>
#include <common/json.h>
#include <stdarg.h>
struct bitcoin_txid;
struct wireaddr;
@@ -40,10 +41,6 @@ struct command {
bool *ok;
/* Have we started a json stream already? For debugging. */
bool have_json_stream;
/* FIXME: Temporary. */
int failcode;
const char *errmsg;
};
struct json_connection {
@@ -97,6 +94,9 @@ void PRINTF_FMT(3, 4) command_fail(struct command *cmd, int code,
/* Mainly for documentation, that we plan to close this later. */
void command_still_pending(struct command *cmd);
/* Low level jcon routines. */
void jcon_append(struct json_connection *jcon, const char *str);
void jcon_append_vfmt(struct json_connection *jcon, const char *fmt, va_list ap);
/* For initialization */
void setup_jsonrpc(struct lightningd *ld, const char *rpc_filename);