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paymod: Generate type-safe accessor functions for modifier data

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This should make it easy for JSON-RPC functions and modifiers to get the
associated data for a given modifier name. Useful if a modifier needs to
access its parent's modifier data, or in other functions that need to access
modifier data, e.g., when passing destination pointers into the `param()`
call.
This commit is contained in:
Christian Decker 2020-05-08 16:46:56 +02:00
parent 23b4dca3c7
commit aeb5cc0b7c
2 changed files with 26 additions and 0 deletions
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13
plugins/libplugin-pay.c
View File

@ -146,6 +146,19 @@ void payment_continue(struct payment *p)
abort();
}
void *payment_mod_get_data(const struct payment *p,
const struct payment_modifier *mod)
{
for (size_t i = 0; p->modifiers[i] != NULL; i++)
if (p->modifiers[i] == mod)
return p->modifier_data[i];
/* If we ever get here it means that we asked for the data for a
* non-existent modifier. This is a compile-time/wiring issue, so we
* better check that modifiers match the data we ask for. */
abort();
}
static inline struct dummy_data *
dummy_data_init(struct payment *p)
{

13
plugins/libplugin-pay.h
View File

@ -120,6 +120,9 @@ struct payment_modifier {
void (*post_step_cb)(void *data, struct payment *p);
};
void *payment_mod_get_data(const struct payment *payment,
const struct payment_modifier *mod);
#define REGISTER_PAYMENT_MODIFIER(name, data_type, data_init_cb, step_cb) \
struct payment_modifier name##_pay_mod = { \
stringify(name), \
@ -129,12 +132,22 @@ struct payment_modifier {
void (*)(data_type, struct payment *), step_cb), \
};
/* The UNUSED marker is used to shut some compilers up. */
#define REGISTER_PAYMENT_MODIFIER_HEADER(name, data_type) \
extern struct payment_modifier name##_pay_mod; \
UNUSED static inline data_type *payment_mod_##name##_get_data( \
const struct payment *p) \
{ \
return payment_mod_get_data(p, &name##_pay_mod); \
}
struct dummy_data {
unsigned int *dummy_param;
};
/* List of globally available payment modifiers. */
extern struct payment_modifier dummy_pay_mod;
REGISTER_PAYMENT_MODIFIER_HEADER(retry, struct retry_mod_data);
struct payment *payment_new(tal_t *ctx, struct command *cmd,
struct payment *parent,