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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1 @@ | ||
| module gno.land/p/n2p5/loci |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,44 @@ | ||
| // loci is a single purpose datastore keyed by the caller's address. It has two | ||
| // functions: Set and Get. loci is plural for locus, which is a central or core | ||
| // place where something is found or from which it originates. In this case, | ||
| // it's a simple key-value store where an address (the key) can store exactly | ||
| // one value (in the form of a byte slice). Only the caller can set the value | ||
| // for their address, but anyone can retrieve the value for any address. | ||
| package loci | ||
|
|
||
| import ( | ||
| "std" | ||
|
|
||
| "gno.land/p/demo/avl" | ||
| ) | ||
|
|
||
| // LociStore is a simple key-value store that uses | ||
| // an AVL tree to store the data. | ||
| type LociStore struct { | ||
| internal *avl.Tree | ||
| } | ||
|
|
||
| // New creates a reference to a new LociStore. | ||
| func New() *LociStore { | ||
| return &LociStore{ | ||
| internal: avl.NewTree(), | ||
| } | ||
| } | ||
|
|
||
| // Set stores a byte slice in the AVL tree using the `std.PrevRealm().Addr()` | ||
| // string as the key. | ||
| func (s *LociStore) Set(value []byte) { | ||
| key := string(std.PrevRealm().Addr()) | ||
| s.internal.Set(key, value) | ||
| } | ||
|
|
||
| // Get retrieves a byte slice from the AVL tree using the provided address. | ||
| // The return values are the byte slice value and a boolean indicating | ||
| // whether the value exists. | ||
| func (s *LociStore) Get(addr std.Address) []byte { | ||
| value, exists := s.internal.Get(string(addr)) | ||
| if !exists { | ||
| return nil | ||
| } | ||
| return value.([]byte) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,84 @@ | ||
| package loci | ||
|
|
||
| import ( | ||
| "std" | ||
| "testing" | ||
|
|
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| "gno.land/p/demo/testutils" | ||
| ) | ||
|
|
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| func TestLociStore(t *testing.T) { | ||
| t.Parallel() | ||
|
|
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| u1 := testutils.TestAddress("u1") | ||
| u2 := testutils.TestAddress("u1") | ||
|
|
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| t.Run("TestSet", func(t *testing.T) { | ||
| t.Parallel() | ||
| store := New() | ||
| u1 := testutils.TestAddress("u1") | ||
|
|
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| m1 := []byte("hello") | ||
| m2 := []byte("world") | ||
| std.TestSetOrigCaller(u1) | ||
|
|
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| // Ensure that the value is nil before setting it. | ||
| r1 := store.Get(u1) | ||
| if r1 != nil { | ||
| t.Errorf("expected value to be nil, got '%s'", r1) | ||
| } | ||
| store.Set(m1) | ||
| // Ensure that the value is correct after setting it. | ||
| r2 := store.Get(u1) | ||
| if string(r2) != "hello" { | ||
| t.Errorf("expected value to be 'hello', got '%s'", r2) | ||
| } | ||
| store.Set(m2) | ||
| // Ensure that the value is correct after overwriting it. | ||
| r3 := store.Get(u1) | ||
| if string(r3) != "world" { | ||
| t.Errorf("expected value to be 'world', got '%s'", r3) | ||
| } | ||
| }) | ||
| t.Run("TestGet", func(t *testing.T) { | ||
| t.Parallel() | ||
| store := New() | ||
| u1 := testutils.TestAddress("u1") | ||
| u2 := testutils.TestAddress("u2") | ||
| u3 := testutils.TestAddress("u3") | ||
| u4 := testutils.TestAddress("u4") | ||
|
|
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| m1 := []byte("hello") | ||
| m2 := []byte("world") | ||
| m3 := []byte("goodbye") | ||
|
|
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| std.TestSetOrigCaller(u1) | ||
| store.Set(m1) | ||
| std.TestSetOrigCaller(u2) | ||
| store.Set(m2) | ||
| std.TestSetOrigCaller(u3) | ||
| store.Set(m3) | ||
|
|
||
| // Ensure that the value is correct after setting it. | ||
| r0 := store.Get(u4) | ||
| if r0 != nil { | ||
| t.Errorf("expected value to be nil, got '%s'", r0) | ||
| } | ||
| // Ensure that the value is correct after setting it. | ||
| r1 := store.Get(u1) | ||
| if string(r1) != "hello" { | ||
| t.Errorf("expected value to be 'hello', got '%s'", r1) | ||
| } | ||
| // Ensure that the value is correct after setting it. | ||
| r2 := store.Get(u2) | ||
| if string(r2) != "world" { | ||
| t.Errorf("expected value to be 'world', got '%s'", r2) | ||
| } | ||
| // Ensure that the value is correct after setting it. | ||
| r3 := store.Get(u3) | ||
| if string(r3) != "goodbye" { | ||
| t.Errorf("expected value to be 'goodbye', got '%s'", r3) | ||
| } | ||
| }) | ||
|
|
||
| } |
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