Add in memory keyring.

.gitignore

@@ -1 +1,2 @@
 .vagrant
+.idea

examples/example.go

@@ -0,0 +1,23 @@
+package examples
+
+import (
+	"github.com/99designs/keyring"
+	"log"
+)
+
+// ExampleOpen is an example of how you would create a new keyring and how you would
+// retrieve data from it.
+func ExampleOpen() {
+	// Use the best keyring implementation for your operating system
+	kr, err := keyring.Open(keyring.Config{
+		ServiceName: "my-service",
+	})
+
+	v, err := kr.Get("llamas")
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	log.Printf("llamas was %v", v)
+}
+

keyring.go

@@ -4,6 +4,7 @@
 package keyring
 
 import (
+	"bytes"
 	"errors"
 	"log"
 	"time"
@@ -21,6 +22,7 @@ const (
 	WinCredBackend       BackendType = "wincred"
 	FileBackend          BackendType = "file"
 	PassBackend          BackendType = "pass"
+	MemoryBackend BackendType = "memory"
 )
 
 // This order makes sure the OS-specific backends
@@ -36,6 +38,7 @@ var backendOrder = []BackendType{
 	// General
 	PassBackend,
 	FileBackend,
+	MemoryBackend,
 }
 
 var supportedBackends = map[BackendType]opener{}
@@ -85,6 +88,17 @@ type Item struct {
 	KeychainNotSynchronizable   bool
 }
 
+// Equals will return true if the current item is equal to the supplied item.
+func (i Item) Equals(other Item) bool {
+
+	return i.Key == other.Key &&
+		bytes.Equal(i.Data, other.Data) &&
+		i.Label == other.Label &&
+		i.Description == other.Description &&
+		i.KeychainNotTrustApplication == other.KeychainNotTrustApplication &&
+		i.KeychainNotSynchronizable == other.KeychainNotSynchronizable
+}
+
 // Metadata is information about a thing stored on the keyring; retrieving
 // metadata must not require authentication.  The embedded Item should be
 // filled in with an empty Data field.

keyring_test.go

@@ -1,21 +1,64 @@
-package keyring_test
+package keyring
 
-import (
-	"log"
+import "testing"
 
-	"github.com/99designs/keyring"
-)
+func TestItemsEqual(t *testing.T) {
+	i := Item{
+		Key: "key",
+		Data: []byte("data"),
+		Label: "label",
+		Description: "description",
+		KeychainNotTrustApplication: false,
+		KeychainNotSynchronizable: false,
+	}
+
+	// We're basically going to create copies of i and make sure each field difference generates a false return value
+	// from Equals.
+
+	// First, make sure identity is true.
+	o := i
+	if !i.Equals(o) {
+		t.Fatalf("identity case should result in true")
+	}
+
+	// Test key differences
+	o.Key = "something else"
+	if i.Equals(o) {
+		t.Fatalf("key difference should result in false")
+	}
 
-func ExampleOpen() {
-	// Use the best keyring implementation for your operating system
-	kr, err := keyring.Open(keyring.Config{
-		ServiceName: "my-service",
-	})
+	// Test key differences
+	o = i
+	o.Data = []byte("something else")
+	if i.Equals(o) {
+		t.Fatalf("data difference should result in false")
+	}
+
+	// Test label differences
+	o = i
+	o.Label = "something else"
+	if i.Equals(o) {
+		t.Fatalf("label difference should result in false")
+	}
 
-	v, err := kr.Get("llamas")
-	if err != nil {
-		log.Fatal(err)
+	// Test description differences
+	o = i
+	o.Description = "something else"
+	if i.Equals(o) {
+		t.Fatalf("description difference should result in false")
 	}
 
-	log.Printf("llamas was %v", v)
+	// Test KeychainNotTrustApplication differences
+	o = i
+	o.KeychainNotTrustApplication = true
+	if i.Equals(o) {
+		t.Fatalf("KeyChainNotTrustApplication difference should result in false")
+	}
+
+	// Test KeychainNotSynchronizable differences
+	o = i
+	o.KeychainNotSynchronizable = true
+	if i.Equals(o) {
+		t.Fatalf("KeyChainNotSynchronizable difference should result in false")
+	}
 }

kwallet.go

@@ -107,7 +107,7 @@ func (k *kwalletKeyring) Get(key string) (Item, error) {
 // found in docs for methods to use to retrieve metadata without needing unlock
 // credentials.
 func (k *kwalletKeyring) GetMetadata(_ string) (Metadata, error) {
-	return Metadata{}, ErrMetadataNeedsCredentials
+	return Metadata{}, ErrNoAvailImpl
 }
 
 func (k *kwalletKeyring) Set(item Item) error {

memory.go

@@ -0,0 +1,71 @@
+package keyring
+
+import (
+	"sync"
+)
+
+func init() {
+	supportedBackends[MemoryBackend] = opener(func(cfg Config) (Keyring, error) {
+		memory := newMemoryKeyring()
+
+		return memory, nil
+	})
+}
+
+type memoryKeyring struct {
+	mutex sync.RWMutex
+	mapStore map[string]Item
+}
+
+func newMemoryKeyring() *memoryKeyring {
+	return &memoryKeyring{
+		mutex: sync.RWMutex{},
+		mapStore: map[string]Item{},
+	}
+}
+
+func (k *memoryKeyring) Get(key string) (Item, error) {
+	k.mutex.RLock()
+	defer k.mutex.RUnlock()
+
+	if item, ok := k.mapStore[key]; !ok {
+		return Item{}, ErrKeyNotFound
+	} else {
+		return item, nil
+	}
+}
+
+// GetMetadata for memory returns an error indicating that it's unsupported
+// for this backend.
+//
+// It doesn't really apply to the memory backend, as it's a simple wrapper around a map.
+func (k *memoryKeyring) GetMetadata(_ string) (Metadata, error) {
+	return Metadata{}, ErrNoAvailImpl
+}
+
+func (k *memoryKeyring) Set(item Item) error {
+	k.mutex.Lock()
+	defer k.mutex.Unlock()
+
+	k.mapStore[item.Key] = item
+	return nil
+}
+
+func (k *memoryKeyring) Remove(key string) error {
+	k.mutex.Lock()
+	defer k.mutex.Unlock()
+
+	delete(k.mapStore, key)
+	return nil
+}
+
+func (k *memoryKeyring) Keys() ([]string, error) {
+	k.mutex.RLock()
+	defer k.mutex.RUnlock()
+
+	keys := []string{}
+	for k := range k.mapStore {
+		keys = append(keys, k)
+	}
+	return keys, nil
+}

memory_test.go

@@ -0,0 +1,89 @@
+package keyring
+
+import "testing"
+
+func TestSetAndGets(t *testing.T) {
+	k := newMemoryKeyring()
+
+	// Set a few items and try to retrieve them
+	items := []Item{
+		makeItem("key1", "data1", "label1", "description1"),
+		makeItem("key2", "data2", "label2", "description2"),
+		makeItem("key3", "data3", "label3", "description3"),
+		makeItem("key4", "data4", "label4", "description4"),
+	}
+
+	for _, item := range items {
+		k.Set(item)
+	}
+
+	for _, item := range items {
+		getItem, _ := k.Get(item.Key)
+
+		if !item.Equals(getItem) {
+			t.Fatalf("%s is not equal to its version from the store", item.Key)
+		}
+	}
+
+	if _, err := k.Get("non-existent key"); err != ErrKeyNotFound {
+		t.Fatalf("error for non-existent key should have been key not found, was: %v", err)
+	}
+}
+
+func TestRemove(t *testing.T) {
+	k := newMemoryKeyring()
+
+	item := makeItem("key1", "data1", "label1", "description1")
+
+	k.Set(item)
+
+	if _, err := k.Get(item.Key); err != nil {
+		t.Fatalf("unable to find stored item")
+	}
+
+	k.Remove(item.Key)
+
+	if _, err := k.Get(item.Key); err == nil {
+		t.Fatalf("after removal, should not have been able to find item")
+	}
+}
+
+func TestKeys(t *testing.T) {
+	k := newMemoryKeyring()
+
+	items := []Item{
+		makeItem("key1", "data1", "label1", "description1"),
+		makeItem("key2", "data2", "label2", "description2"),
+		makeItem("key3", "data3", "label3", "description3"),
+		makeItem("key4", "data4", "label4", "description4"),
+	}
+
+	for _, item := range items {
+		k.Set(item)
+	}
+
+	keys, _ := k.Keys()
+	for _, item := range items {
+		foundKey := false
+
+		for _, key := range keys {
+			if item.Key == key	 {
+				foundKey = true
+				break
+			}
+		}
+
+		if !foundKey {
+			t.Errorf("unable to find key %s", item.Key)
+		}
+	}
+}
+
+func makeItem(key, data, label, description string) Item {
+	return Item{
+		Key: key,
+		Data: []byte(data),
+		Label: label,
+		Description: description,
+	}
+}