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Use dedicated type for error codes

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Before this patch we used `int` for error codes. The problem with
`int` is that we try to pass it to/from wire and the size of `int` is
not defined by the standard. So a sender with 4-byte `int` would write
4 bytes to the wire and a receiver with 2-byte `int` (for example) would
read just 2 bytes from the wire.

To resolve this:

* Introduce an error code type with a known size:
  `typedef s32 errcode_t`.

* Change all error code macros to constants of type `errcode_t`.
  Constants also play better with gdb - it would visualize the name of
  the constant instead of the numeric value.

* Change all functions that take error codes to take the new type
  `errcode_t` instead of `int`.

* Introduce towire / fromwire functions to send / receive the newly added
  type `errcode_t` and use it instead of `towire_int()`.

In addition:

* Remove the now unneeded `towire_int()`.

* Replace a hardcoded error code `-2` with a new constant
  `INVOICE_EXPIRED_DURING_WAIT` (903).

Changelog-Changed: The waitinvoice command would now return error code 903 to designate that the invoice expired during wait, instead of the previous -2
This commit is contained in:
Vasil Dimov
2020-01-26 13:52:29 +01:00
committed by ZmnSCPxj, ZmnSCPxj jxPCSmnZ
parent 295ca2a436
commit 55173a56b7
29 changed files with 187 additions and 108 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
plugins/pay.c
View File

@@ -7,6 +7,7 @@
#include <ccan/tal/str/str.h>
#include <common/amount.h>
#include <common/bolt11.h>
#include <common/errcode.h>
#include <common/features.h>
#include <common/gossip_constants.h>
#include <common/pseudorand.h>
@@ -425,13 +426,14 @@ static struct command_result *waitsendpay_error(struct command *cmd,
{
struct pay_attempt *attempt = current_attempt(pc);
const jsmntok_t *codetok, *failcodetok, *nodeidtok, *scidtok, *dirtok;
int code, failcode;
errcode_t code;
int failcode;
bool node_err = false;
attempt_failed_tok(pc, "waitsendpay", buf, error);
codetok = json_get_member(buf, error, "code");
if (!json_to_int(buf, codetok, &code))
if (!json_to_errcode(buf, codetok, &code))
plugin_err("waitsendpay error gave no 'code'? '%.*s'",
error->end - error->start, buf + error->start);
@@ -849,13 +851,13 @@ static struct command_result *getroute_error(struct command *cmd,
const jsmntok_t *error,
struct pay_command *pc)
{
int code;
errcode_t code;
const jsmntok_t *codetok;
attempt_failed_tok(pc, "getroute", buf, error);
codetok = json_get_member(buf, error, "code");
if (!json_to_int(buf, codetok, &code))
if (!json_to_errcode(buf, codetok, &code))
plugin_err("getroute error gave no 'code'? '%.*s'",
error->end - error->start, buf + error->start);