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jsonrpc: don't crash on multiple commands at once. 

Once we read a command, we are supposed to io_wait until it finishes.
However, we are actually woken in two places: when it's complete
(which is correct), and when it's written out (which is wrong).

We don't care when it's written out, only when it's finished:
refactor to make json_done() free and NULL the old ->current,
rather than have the callers do it.  Now it's clear that it's
ready for both new output and new input.

Fixes: #934
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2018-02-14 16:48:29 +10:30 committed by Christian Decker
parent cb1a4a5180
commit a08bcfdbd3
2 changed files with 26 additions and 5 deletions
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12
lightningd/jsonrpc.c
View File

@ -242,8 +242,13 @@ static void json_done(struct json_connection *jcon, const char *json TAKES)
struct json_output *out = tal(jcon, struct json_output);
out->json = tal_strdup(out, json);
/* Queue for writing, and wake writer (and maybe reader). */
/* Clear existing command (if any: NULL in malformed case) */
jcon->current = tal_free(jcon->current);
/* Queue for writing. */
list_add_tail(&jcon->output, &out->list);
/* Both writer and reader can now continue. */
io_wake(jcon);
}
@ -378,7 +383,6 @@ void command_success(struct command *cmd, struct json_result *result)
assert(jcon->current == cmd);
connection_complete_ok(jcon, cmd->id, result);
log_debug(jcon->log, "Success");
jcon->current = tal_free(cmd);
}
static void command_fail_v(struct command *cmd,
@ -402,7 +406,6 @@ static void command_fail_v(struct command *cmd,
assert(jcon->current == cmd);
connection_complete_error(jcon, cmd->id, error, code, data);
jcon->current = tal_free(cmd);
}
void command_fail(struct command *cmd, const char *fmt, ...)
{
@ -628,8 +631,7 @@ static struct io_plan *write_json(struct io_conn *conn,
return io_close(conn);
}
/* Reader can go again now. */
io_wake(jcon);
/* Wait for more output. */
return io_out_wait(conn, jcon, write_json, jcon);
}

19
tests/test_lightningd.py
View File

@ -10,6 +10,7 @@ import queue
import os
import random
import re
import socket
import sqlite3
import string
import subprocess
@ -3407,6 +3408,24 @@ class LightningDTests(BaseLightningDTests):
assert channels[i]['state'] == 'ONCHAIND_MUTUAL'
assert channels[-1]['state'] == 'CLOSINGD_COMPLETE'
def test_multirpc(self):
"""Test that we can do multiple RPC without waiting for response"""
l1,l2 = self.connect()
sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
sock.connect(l1.rpc.socket_path)
sock.sendall(b'{"id":1,"jsonrpc":"2.0","method":"listpeers","params":[]}\n'
b'{"id":2,"jsonrpc":"2.0","method":"listpeers","params":[]}\n'
b'{"id":3,"jsonrpc":"2.0","method":"listpeers","params":[]}\n'
b'{"id":4,"jsonrpc":"2.0","method":"listpeers","params":[]}\n'
b'{"id":5,"jsonrpc":"2.0","method":"listpeers","params":[]}\n'
b'{"id":6,"jsonrpc":"2.0","method":"listpeers","params":[]}\n')
# This isn't quite right, as it will read the first object and stop.
# But enough to trigger the crash!
l1.rpc._readobj(sock)
sock.close()
def test_cli(self):
l1 = self.node_factory.get_node()