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param: make command sinks (fail/success) return a special type.

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These routines free the 'struct command': a common coding error is not
to return immediately.

To catch this, we make them return a non-NULL 'struct command_result
*', and we're going to make the command handlers return the same (to
encourage 'return command_fail(...)'-style usage).

We also provide two sources for external use:
1. command_param_failed() when param() fails.
2. command_its_complicated() for some complex cases.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2018-12-16 15:19:06 +10:30
parent 12731c4a60
commit 93bf7c4839
6 changed files with 90 additions and 25 deletions
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40
lightningd/jsonrpc.c
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@@ -45,6 +45,23 @@
#include <sys/types.h>
#include <sys/un.h>
/* Dummy structure. */
struct command_result {
char c;
};
static struct command_result param_failed, complete, pending, unknown;
struct command_result *command_param_failed(void)
{
return &param_failed;
}
struct command_result *command_its_complicated(void)
{
return &unknown;
}
/* This represents a JSON RPC connection. It can invoke multiple commands, but
* a command can outlive the connection, which could close any time. */
struct json_connection {
@@ -383,7 +400,8 @@ static void destroy_command(struct command *cmd)
list_del_from(&cmd->jcon->commands, &cmd->list);
}
void command_raw_complete(struct command *cmd, struct json_stream *result)
struct command_result *command_raw_complete(struct command *cmd,
struct json_stream *result)
{
json_stream_close(result, cmd);
@@ -392,28 +410,31 @@ void command_raw_complete(struct command *cmd, struct json_stream *result)
tal_steal(cmd->jcon, result);
tal_free(cmd);
return &complete;
}
void command_success(struct command *cmd, struct json_stream *result)
struct command_result *command_success(struct command *cmd,
struct json_stream *result)
{
assert(cmd);
assert(cmd->have_json_stream);
json_stream_append(result, " }\n\n");
command_raw_complete(cmd, result);
return command_raw_complete(cmd, result);
}
void command_failed(struct command *cmd, struct json_stream *result)
struct command_result *command_failed(struct command *cmd,
struct json_stream *result)
{
assert(cmd->have_json_stream);
/* Have to close error */
json_stream_append(result, " } }\n\n");
command_raw_complete(cmd, result);
return command_raw_complete(cmd, result);
}
void PRINTF_FMT(3, 4) command_fail(struct command *cmd, int code,
const char *fmt, ...)
struct command_result *command_fail(struct command *cmd, int code,
const char *fmt, ...)
{
const char *errmsg;
struct json_stream *r;
@@ -424,13 +445,14 @@ void PRINTF_FMT(3, 4) command_fail(struct command *cmd, int code,
va_end(ap);
r = json_stream_fail_nodata(cmd, code, errmsg);
command_failed(cmd, r);
return command_failed(cmd, r);
}
void command_still_pending(struct command *cmd)
struct command_result *command_still_pending(struct command *cmd)
{
notleak_with_children(cmd);
cmd->pending = true;
return &pending;
}
static void json_command_malformed(struct json_connection *jcon,