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cli: implement new 'flattened JSON' mode.

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Much nicer for grepping, since `{ "foo": { "bar": [7] } }` is turned into
`foo.bar[0]=7`.

Changelog-Added: cli: New `--flat` mode for easy grepping.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2020-05-11 10:33:09 +09:30 • committed by Christian Decker
parent 679d3494b4
commit abb16b4226
2 changed files with 66 additions and 0 deletions
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55
cli/lightning-cli.c
View file

@ -78,6 +78,49 @@ static size_t human_readable(const char *buffer, const jsmntok_t *t, char term)
abort();
}
/* Returns number of tokens digested */
static size_t flat_json(const char *prefix,
const char *buffer, const jsmntok_t *t)
{
size_t i, n;
char *p;
switch (t->type) {
case JSMN_PRIMITIVE:
case JSMN_STRING:
printf("%s=%.*s\n",
prefix, t->end - t->start, buffer + t->start);
return 1;
case JSMN_ARRAY:
n = 1;
for (i = 0; i < t->size; i++) {
p = tal_fmt(NULL, "%s[%zi]", prefix, i);
n += flat_json(p, buffer, t + n);
tal_free(p);
}
return n;
case JSMN_OBJECT:
n = 1;
for (i = 0; i < t->size; i++) {
if (streq(prefix, ""))
p = tal_fmt(NULL, "%.*s",
t[n].end - t[n].start,
buffer + t[n].start);
else
p = tal_fmt(NULL, "%s.%.*s", prefix,
t[n].end - t[n].start,
buffer + t[n].start);
n++;
n += flat_json(p, buffer, t + n);
tal_free(p);
}
return n;
case JSMN_UNDEFINED:
break;
}
abort();
}
static int compare_tok(const jsmntok_t *a, const jsmntok_t *b,
const char *buffer)
{
@ -184,6 +227,7 @@ enum format {
JSON,
HUMAN,
HELPLIST,
FLAT,
DEFAULT_FORMAT,
RAW
};
@ -194,6 +238,12 @@ static char *opt_set_human(enum format *format)
return NULL;
}
static char *opt_set_flat(enum format *format)
{
*format = FLAT;
return NULL;
}
static char *opt_set_json(enum format *format)
{
*format = JSON;
@ -454,6 +504,8 @@ int main(int argc, char *argv[])
"<command> [<params>...]", "Show this message. Use the command help (without hyphens -- \"lightning-cli help\") to get a list of all RPC commands");
opt_register_noarg("-H|--human-readable", opt_set_human, &format,
"Human-readable output (default for 'help')");
opt_register_noarg("-F|--flat", opt_set_flat, &format,
"Flatten output ('x.y.x=' format)");
opt_register_noarg("-J|--json", opt_set_json, &format,
"JSON output (default unless 'help')");
opt_register_noarg("-R|--raw", opt_set_raw, &format,
@ -624,6 +676,9 @@ int main(int argc, char *argv[])
case HUMAN:
human_readable(resp, result, '\n');
break;
case FLAT:
flat_json("", resp, result);
break;
case JSON:
print_json(resp, result, "");
printf("\n");

11
tests/test_misc.py
View file

@ -1063,6 +1063,17 @@ def test_cli(node_factory):
assert [l for l in lines if l.startswith('help=')] == []
assert [l for l in lines if l.startswith('format-hint=')] == []
# Flat format is great for grep. LONG LIVE UNIX!
out = subprocess.check_output(['cli/lightning-cli',
'--network={}'.format(TEST_NETWORK),
'--lightning-dir={}'
.format(l1.daemon.lightning_dir),
'-F',
'help']).decode('utf-8')
lines = out.splitlines()
# Everything is a help[XX]= line, except format-hint.
assert [l for l in lines if not re.search(r'^help\[[0-9]*\].', l)] == ['format-hint=simple']
def test_daemon_option(node_factory):
"""