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json: Add function to duplicate a json_stream

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Will be used in the next commit to fan out notifications to multiple
subscribing plugins. We can't just use `tal_dup` from outside since
the definition is hidden outside the compilation unit.

Signed-off-by: Christian Decker <decker.christian@gmail.com>
This commit is contained in:
Christian Decker
2018-12-12 19:09:06 +01:00
parent 7355e62964
commit dd2696a88b
2 changed files with 24 additions and 0 deletions
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11
lightningd/json_stream.c
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@@ -59,6 +59,17 @@ struct json_stream *new_json_stream(const tal_t *ctx, struct command *writer)
return js;
}
struct json_stream *json_stream_dup(const tal_t *ctx, struct json_stream *original)
{
size_t num_elems = membuf_num_elems(&original->outbuf);
char *elems = membuf_elems(&original->outbuf);
struct json_stream *js = tal_dup(ctx, struct json_stream, original);
membuf_init(&js->outbuf, tal_dup_arr(js, char, elems, num_elems, 0),
num_elems, membuf_tal_realloc);
membuf_added(&js->outbuf, num_elems);
return js;
}
bool json_stream_still_writing(const struct json_stream *js)
{
return js->writer != NULL;