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common/json_stream: add generic double-cr helper.

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And make caller of json_stream_forward_change_id use it, since
we're going to reuse that.

Also call json_out_finished here, so next object doesn't have a ","
prepended.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2020-10-12 16:03:49 +10:30
parent d970addd4b
commit a95205c25c
3 changed files with 30 additions and 10 deletions
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28
common/json_stream.c
View File

@@ -82,6 +82,31 @@ void json_stream_append(struct json_stream *js,
memcpy(dest, str, len);
}
/* We promise it will end in '\n\n' */
void json_stream_double_cr(struct json_stream *js)
{
const char *contents;
size_t len, cr_needed;
if (!js->jout)
return;
/* Must be well-formed at this point! */
json_out_finished(js->jout);
contents = json_out_contents(js->jout, &len);
/* It's an object (with an id!): definitely can't be less that "{}" */
assert(len >= 2);
if (contents[len-1] == '\n') {
if (contents[len-2] == '\n')
return;
cr_needed = 1;
} else
cr_needed = 2;
json_stream_append(js, "\n\n", cr_needed);
}
void json_stream_close(struct json_stream *js, struct command *writer)
{
/* FIXME: We use writer == NULL for malformed: make writer a void *?
@@ -89,8 +114,7 @@ void json_stream_close(struct json_stream *js, struct command *writer)
assert(js->writer == writer);
/* Should be well-formed at this point! */
json_out_finished(js->jout);
json_stream_append(js, "\n\n", strlen("\n\n"));
json_stream_double_cr(js);
json_stream_flush(js);
js->writer = NULL;
}

2
common/json_stream.h
View File

@@ -160,6 +160,8 @@ struct io_plan *json_stream_output_(struct json_stream *js,
void *arg),
void *arg);
/* Ensure there's a double \n after a JSON response. */
void json_stream_double_cr(struct json_stream *js);
void json_stream_flush(struct json_stream *js);
#endif /* LIGHTNING_COMMON_JSON_STREAM_H */

10
lightningd/plugin.c
View File

@@ -774,14 +774,6 @@ static void json_stream_forward_change_id(struct json_stream *stream,
json_stream_append(stream, new_id, strlen(new_id));
json_stream_append(stream, buffer + idtok->end + offset,
toks->end - idtok->end - offset);
/* We promise it will end in '\n\n' */
/* It's an object (with an id!): definitely can't be less that "{}" */
assert(toks->end - toks->start >= 2);
if (buffer[toks->end-1] != '\n')
json_stream_append(stream, "\n\n", 2);
else if (buffer[toks->end-2] != '\n')
json_stream_append(stream, "\n", 1);
}
static void plugin_rpcmethod_cb(const char *buffer,
@@ -794,6 +786,7 @@ static void plugin_rpcmethod_cb(const char *buffer,
response = json_stream_raw_for_cmd(cmd);
json_stream_forward_change_id(response, buffer, toks, idtok, cmd->id);
json_stream_double_cr(response);
command_raw_complete(cmd, response);
list_del(&call->list);
@@ -851,6 +844,7 @@ static struct command_result *plugin_rpcmethod_dispatch(struct command *cmd,
snprintf(id, ARRAY_SIZE(id), "%"PRIu64, req->id);
json_stream_forward_change_id(req->stream, buffer, toks, idtok, id);
json_stream_double_cr(req->stream);
plugin_request_send(plugin, req);
req->stream = NULL;