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util/deephash: implement SelfHasher to allow types to hash themselves

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Updates: corp#16409
Signed-off-by: Tom DNetto <tom@tailscale.com>
This commit is contained in:
Tom DNetto
2024-01-31 15:33:59 -08:00
committed by Tom
parent b4b2ec7801
commit 2aeef4e610
4 changed files with 62 additions and 2 deletions
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15
util/deephash/deephash_test.go
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@ -29,6 +29,7 @@ import (
"tailscale.com/types/ptr"
"tailscale.com/util/deephash/testtype"
"tailscale.com/util/dnsname"
"tailscale.com/util/hashx"
"tailscale.com/version"
"tailscale.com/wgengine/filter"
"tailscale.com/wgengine/router"
@ -41,6 +42,14 @@ func (p appendBytes) AppendTo(b []byte) []byte {
return append(b, p...)
}
type implsSelfHasherValueRecv struct {
emit uint64
}
func (s implsSelfHasherValueRecv) Hash(h *hashx.Block512) {
h.HashUint64(s.emit)
}
func TestHash(t *testing.T) {
type tuple [2]any
type iface struct{ X any }
@ -169,6 +178,12 @@ func TestHash(t *testing.T) {
b[0] = 1
return b
}()))}, wantEq: false},
{in: tuple{&implsSelfHasher{}, &implsSelfHasher{}}, wantEq: true},
{in: tuple{(*implsSelfHasher)(nil), (*implsSelfHasher)(nil)}, wantEq: true},
{in: tuple{(*implsSelfHasher)(nil), &implsSelfHasher{}}, wantEq: false},
{in: tuple{&implsSelfHasher{emit: 1}, &implsSelfHasher{emit: 2}}, wantEq: false},
{in: tuple{implsSelfHasherValueRecv{emit: 1}, implsSelfHasherValueRecv{emit: 2}}, wantEq: false},
{in: tuple{implsSelfHasherValueRecv{emit: 2}, implsSelfHasherValueRecv{emit: 2}}, wantEq: true},
}
for _, tt := range tests {