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// Copyright 2025 The Tessera authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package tessera
import (
"context"
"strings"
"testing"
"time"
"golang.org/x/mod/sumdb/note"
)
func TestMemoize(t *testing.T) {
// Set up an AddFn which will increment a counter every time it's called, and return that in the Index.
i := uint64(0)
deleg := func() (Index, error) {
i++
return Index{
Index: i,
}, nil
}
add := func(_ context.Context, _ *Entry) IndexFuture {
return deleg
}
// Create a single future (for a single Entry), and convince ourselves that the counter is being incremented
// each time the future is being invoked.
f1 := add(nil, nil)
a, _ := f1()
b, _ := f1()
if a.Index == b.Index {
t.Fatalf("a(=%d) == b(=%d)", a.Index, b.Index)
}
// Now create an AddFn which memoizes the result of the delegate, like we do in NewAppender, and assert that
// repeated calls to the future work as expected; only incrementing the counter once.
add = func(_ context.Context, _ *Entry) IndexFuture {
return memoizeFuture(deleg)
}
f2 := add(nil, nil)
c, _ := f2()
d, _ := f2()
if c.Index != d.Index {
t.Fatalf("c(=%d) != d(=%d)", c.Index, d.Index)
}
}
const testSignerKey = "PRIVATE+KEY+example.com/log/testdata+33d7b496+AeymY/SZAX0jZcJ8enZ5FY1Dz+wTML2yWSkK+9DSF3eg"
func TestAppendOptionsValid(t *testing.T) {
for _, test := range []struct {
name string
opts *AppendOptions
wantErrContains string
}{
{
name: "Valid",
opts: NewAppendOptions().WithCheckpointSigner(mustCreateSigner(t, testSignerKey)),
}, {
name: "Valid: CheckpointRepublishInterval == CheckpointInterval",
opts: NewAppendOptions().
WithCheckpointSigner(mustCreateSigner(t, testSignerKey)).
WithCheckpointInterval(10 * time.Second).
WithCheckpointRepublishInterval(10 * time.Second),
}, {
name: "Error: CheckpointRepublishInterval < CheckpointInterval",
opts: NewAppendOptions().
WithCheckpointSigner(mustCreateSigner(t, testSignerKey)).
WithCheckpointInterval(10 * time.Second).
WithCheckpointRepublishInterval(9 * time.Second),
wantErrContains: "WithCheckpointRepublishInterval",
}, {
name: "Error: No CheckpointSigner",
opts: NewAppendOptions(),
wantErrContains: "WithCheckpointSigner",
},
} {
t.Run(test.name, func(t *testing.T) {
err := test.opts.valid()
switch gotErr, wantErr := err != nil, test.wantErrContains != ""; {
case gotErr && !wantErr:
t.Fatalf("Got unexpected error %q, want no error", err)
case !gotErr && wantErr:
t.Fatalf("Got no error, expected error")
case gotErr:
if !strings.Contains(err.Error(), test.wantErrContains) {
t.Fatalf("Got err %q, want error containing %q", err.Error(), test.wantErrContains)
}
}
})
}
}
func TestMaxEntrySize(t *testing.T) {
d := func(_ context.Context, e *Entry) IndexFuture {
return func() (Index, error) {
return Index{}, nil
}
}
const limit = 128
add := entrySizeLimitDecorator(d, limit)
for _, test := range []struct {
name string
size uint
wantErr bool
}{
{
name: "< limit",
size: limit - 1,
}, {
name: "== limit",
size: limit,
}, {
name: "> limit",
size: limit + 1,
wantErr: true,
},
} {
t.Run(test.name, func(t *testing.T) {
_, err := add(t.Context(), NewEntry(make([]byte, test.size)))()
if gotErr := err != nil; gotErr != test.wantErr {
t.Fatalf("Got err %q, want err? %T", err, test.wantErr)
}
})
}
}
func mustCreateSigner(t *testing.T, k string) note.Signer {
t.Helper()
s, err := note.NewSigner(k)
if err != nil {
t.Fatalf("Failed to create signer: %v", err)
}
return s
}
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