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Merge bitcoin/bitcoin#22098: [test, init] DNS seed querying logic

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82b6f89819 [style] Small style improvements to DNS parameters (Amiti Uttarwar)
4c89e24f64 [test] Test the delay before querying DNS seeds (Amiti Uttarwar)
6395c8ed56 [test] Test the interactions between -forcednsseed and -dnsseed (Amiti Uttarwar)
6f6b7df6bd [init] Disallow starting up with conflicting paramters for -dnsseed and -forcednsseed (Amiti Uttarwar)
26d0ffe4f2 [test] Test -forcednsseed causes querying DNS seeds (Amiti Uttarwar)
35851450a9 [test] Test the interactions between -connect and -dnsseed (Amiti Uttarwar)
75c05af361 [test] Test logic to query DNS seeds with block-relay-only connections (Amiti Uttarwar)
9c08719778 [test] Introduce test logic to query DNS seeds (Amiti Uttarwar)

Pull request description:

  This PR adds a DNS seed to the regtest chain params to enable testing the DNS seed querying logic of `CConnman::ThreadDNSAddressSeed` and relevant startup parameters. Adds coverage for the changes in #22013 (and then some).

  The main behavioral change to bitcoind is that this PR disallows starting up with conflicting parameters for `-dnsseed` and `-forcednsseed`.

  The tests include:
  * parameter interactions of different combinations of `-connect`, `-dnsseed` and `-forcednsseed`
  * the delay before querying DNS seeds depending on how many addresses are in the addrman
  * the behavior of `-forcednsseed`
  * skipping DNS querying if we have outbound full relay connections & not block-relay-only connections

  Huge props to mzumsande for identifying the timing technique for testing successful connections before running `ThreadDNSAddressSeed` 🙌🏽

ACKs for top commit:
  mzumsande:
    ACK 82b6f89819
  jnewbery:
    reACK 82b6f89819

Tree-SHA512: 9f0c29bfbf99426727e79c0a25606ae09deab91a92e3c5cee7f84c3ca7503a8ac9ab85a85c51841d40b164ef8c991326070f0b2f41d075fb7985df26f6e95d6d
This commit is contained in:
fanquake
2021-08-03 10:49:31 +08:00
parent 06788c6705 82b6f89819
commit 10fbb37268
6 changed files with 144 additions and 7 deletions
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5
test/functional/feature_config_args.py
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@ -159,8 +159,9 @@ class ConfArgsTest(BitcoinTestFramework):
self.stop_node(0)
# No peers.dat exists and -dnsseed=1
# We expect the node will use DNS Seeds, but Regtest mode has 0 DNS seeds
# So after 60 seconds, the node should fallback to fixed seeds (this is a slow test)
# We expect the node will use DNS Seeds, but Regtest mode does not have
# any valid DNS seeds. So after 60 seconds, the node should fallback to
# fixed seeds
assert not os.path.exists(os.path.join(default_data_dir, "peers.dat"))
start = int(time.time())
with self.nodes[0].assert_debug_log(expected_msgs=[