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import dns.rdata
import dns.rdataset
import dns.rdtypes.IN.SRV
def test_processing_order_shuffle():
rds = dns.rdataset.from_text("in", "a", 300, "10.0.0.1", "10.0.0.2", "10.0.0.3")
seen = set()
for i in range(100):
po = rds.processing_order()
assert len(po) == 3
for j in range(3):
assert rds[j] in po
seen.add(tuple(po))
assert len(seen) == 6
def test_processing_order_priority_mx():
rds = dns.rdataset.from_text("in", "mx", 300, "10 a", "20 b", "20 c")
seen = set()
for i in range(100):
po = rds.processing_order()
assert len(po) == 3
for j in range(3):
assert rds[j] in po
assert rds[0] == po[0]
seen.add(tuple(po))
assert len(seen) == 2
def test_processing_order_priority_weighted():
rds = dns.rdataset.from_text(
"in", "srv", 300, "1 10 1234 a", "2 90 1234 b", "2 10 1234 c"
)
seen = set()
weight_90_count = 0
weight_10_count = 0
for i in range(100):
po = rds.processing_order()
assert len(po) == 3
for j in range(3):
assert rds[j] in po
assert rds[0] == po[0]
assert isinstance(po[1], dns.rdtypes.IN.SRV.SRV)
if po[1].weight == 90:
weight_90_count += 1
else:
assert po[1].weight == 10
weight_10_count += 1
seen.add(tuple(po))
assert len(seen) == 2
# We can't assert anything with certainty given these are random
# draws, but it's super likely that weight_90_count > weight_10_count,
# so we just assert that.
assert weight_90_count > weight_10_count
def test_processing_order_priority_naptr():
rds = dns.rdataset.from_text(
"in",
"naptr",
300,
"1 10 a b c foo.",
"1 20 a b c foo.",
"2 10 a b c foo.",
"2 10 d e f bar.",
)
seen = set()
for i in range(100):
po = rds.processing_order()
assert len(po) == 4
for j in range(4):
assert rds[j] in po
assert rds[0] == po[0]
assert rds[1] == po[1]
seen.add(tuple(po))
assert len(seen) == 2
def test_processing_order_empty():
rds = dns.rdataset.from_text("in", "naptr", 300)
po = rds.processing_order()
assert po == []
def test_processing_singleton_priority():
rds = dns.rdataset.from_text("in", "mx", 300, "10 a")
po = rds.processing_order()
assert po == [rds[0]]
def test_processing_singleton_weighted():
rds = dns.rdataset.from_text("in", "srv", 300, "1 10 1234 a")
po = rds.processing_order()
assert po == [rds[0]]
def test_processing_all_zero_weight_srv():
rds = dns.rdataset.from_text(
"in", "srv", 300, "1 0 1234 a", "1 0 1234 b", "1 0 1234 c"
)
seen = set()
for i in range(100):
po = rds.processing_order()
assert len(po) == 3
for j in range(3):
assert rds[j] in po
seen.add(tuple(po))
assert len(seen) == 6
def test_processing_order_uri():
# We're testing here just to provide coverage for URI methods; the
# testing of the weighting algorithm is done above in tests with
# SRV.
rds = dns.rdataset.from_text(
"in",
"uri",
300,
'1 1 "ftp://ftp1.example.com/public"',
'2 2 "ftp://ftp2.example.com/public"',
'3 3 "ftp://ftp3.example.com/public"',
)
po = rds.processing_order()
assert len(po) == 3
for i in range(3):
assert po[i] == rds[i]
def test_processing_order_svcb():
# We're testing here just to provide coverage for SVCB methods; the
# testing of the priority algorithm is done above in tests with
# MX and NAPTR.
rds = dns.rdataset.from_text(
"in",
"svcb",
300,
"1 . mandatory=alpn alpn=h2",
"2 . mandatory=alpn alpn=h2",
"3 . mandatory=alpn alpn=h2",
)
po = rds.processing_order()
assert len(po) == 3
for i in range(3):
assert po[i] == rds[i]
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