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common/json: make json_scan return an error string.

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This makes for more useful errors.  It prints where it was up to in
the guide, but doesn't print the entire JSON it's scanning.

Suggested-by: Christian Decker
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2021-01-07 16:04:43 +10:30
committed by Christian Decker
parent 53582a0f81
commit 3b7d0e7a62
9 changed files with 381 additions and 265 deletions
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34
plugins/libplugin.c
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@@ -498,6 +498,7 @@ void rpc_scan(struct plugin *plugin,
...)
{
bool error;
const char *err;
const jsmntok_t *contents;
int reqlen;
const char *p;
@@ -515,12 +516,13 @@ void rpc_scan(struct plugin *plugin,
p = membuf_consume(&plugin->rpc_conn->mb, reqlen);
va_start(ap, guide);
error = !json_scanv(p, contents, guide, ap);
err = json_scanv(tmpctx, p, contents, guide, ap);
va_end(ap);
if (error)
plugin_err(plugin, "Could not parse %s in reply to %s: '%.*s'",
guide, method, reqlen, membuf_elems(&plugin->rpc_conn->mb));
if (err)
plugin_err(plugin, "Could not parse %s in reply to %s: %s: '%.*s'",
guide, method, err,
reqlen, membuf_elems(&plugin->rpc_conn->mb));
}
static void handle_rpc_reply(struct plugin *plugin, const jsmntok_t *toks)
@@ -810,19 +812,21 @@ static struct command_result *handle_init(struct command *cmd,
char *dir, *network;
struct plugin *p = cmd->plugin;
bool with_rpc = p->rpc_conn != NULL;
const char *err;
configtok = json_get_member(buf, params, "configuration");
if (!json_scan(buf, configtok,
"{lightning-dir:%"
",network:%"
",feature_set:%"
",rpc-file:%}",
JSON_SCAN_TAL(tmpctx, json_strdup, &dir),
JSON_SCAN_TAL(tmpctx, json_strdup, &network),
JSON_SCAN_TAL(p, json_to_feature_set, &p->our_features),
JSON_SCAN_TAL(p, json_strdup, &p->rpc_location)))
plugin_err(p, "cannot scan init params: %.*s",
json_tok_full_len(params),
err = json_scan(tmpctx, buf, configtok,
"{lightning-dir:%"
",network:%"
",feature_set:%"
",rpc-file:%}",
JSON_SCAN_TAL(tmpctx, json_strdup, &dir),
JSON_SCAN_TAL(tmpctx, json_strdup, &network),
JSON_SCAN_TAL(p, json_to_feature_set, &p->our_features),
JSON_SCAN_TAL(p, json_strdup, &p->rpc_location));
if (err)
plugin_err(p, "cannot scan init params: %s: %.*s",
err, json_tok_full_len(params),
json_tok_full(buf, params));
/* Move into lightning directory: other files are relative */