Adding simple file storage driver for persistent storage

file_storage.go

@@ -0,0 +1,22 @@
+package minio
+
+import (
+	"io/ioutil"
+	"os"
+	"path"
+	"path/filepath"
+)
+
+type FileStorage struct {
+	RootDir string
+}
+
+func (storage FileStorage) Get(objectPath string) ([]byte, error) {
+	return ioutil.ReadFile(path.Join(storage.RootDir, objectPath))
+
+}
+
+func (storage FileStorage) Put(objectPath string, object []byte) error {
+	os.MkdirAll(filepath.Dir(path.Join(storage.RootDir, objectPath)), 0700)
+	return ioutil.WriteFile(path.Join(storage.RootDir, objectPath), object, 0600)
+}

file_storage_test.go

@@ -0,0 +1,51 @@
+package minio
+
+import (
+	. "gopkg.in/check.v1"
+	"io/ioutil"
+	"os"
+)
+
+type FileStorageSuite struct{}
+
+var _ = Suite(&FileStorageSuite{})
+
+func makeTempTestDir() (string, error) {
+	return ioutil.TempDir("/tmp", "minio-test-")
+}
+
+func (s *FileStorageSuite) TestFileStoragePutAtRootPath(c *C) {
+	rootDir, err := makeTempTestDir()
+	c.Assert(err, IsNil)
+	defer os.RemoveAll(rootDir)
+
+	var storage ObjectStorage
+	storage = FileStorage{
+		RootDir: rootDir,
+	}
+
+	storage.Put("path1", []byte("object1"))
+
+	// assert object1 was created in correct path
+	object1, err := storage.Get("path1")
+	c.Assert(err, IsNil)
+	c.Assert(string(object1), Equals, "object1")
+}
+
+func (s *FileStorageSuite) TestFileStoragePutDirPath(c *C) {
+	rootDir, err := makeTempTestDir()
+	c.Assert(err, IsNil)
+	defer os.RemoveAll(rootDir)
+
+	var storage ObjectStorage
+	storage = FileStorage{
+		RootDir: rootDir,
+	}
+
+	storage.Put("path1/path2/path3", []byte("object"))
+
+	// assert object1 was created in correct path
+	object1, err := storage.Get("path1/path2/path3")
+	c.Assert(err, IsNil)
+	c.Assert(string(object1), Equals, "object")
+}

gateway.go

@@ -7,6 +7,7 @@ import (
 	"github.com/tchap/go-patricia/patricia"
 	"io/ioutil"
 	"net/http"
+	"path"
 )
 
 // Stores system configuration, populated from CLI or test runner
@@ -14,6 +15,7 @@ type GatewayConfig struct {
 	StorageDriver     StorageDriver
 	BucketDriver      BucketDriver
 	requestBucketChan chan BucketRequest
+	dataDir           string
 }
 
 // Message for requesting a bucket
@@ -37,7 +39,7 @@ type Bucket interface {
 type BucketDriver func(config GatewayConfig)
 
 // Storage driver function, should read from a channel and respond through callback channels
-type StorageDriver func(bucket string, input chan ObjectRequest)
+type StorageDriver func(bucket string, input chan ObjectRequest, config GatewayConfig)
 
 // TODO remove when building real context
 type fakeContext struct{}
@@ -103,7 +105,7 @@ func SynchronizedBucketDriver(config GatewayConfig) {
 	for request := range config.requestBucketChan {
 		if buckets[request.name] == nil {
 			bucketChannel := make(chan ObjectRequest)
-			go config.StorageDriver(request.name, bucketChannel)
+			go config.StorageDriver(request.name, bucketChannel, config)
 			buckets[request.name] = &SynchronizedBucket{
 				name:    request.name,
 				channel: bucketChannel,
@@ -176,17 +178,14 @@ func (bucket *SynchronizedBucket) closeChannel() {
 	close(bucket.channel)
 }
 
-func InMemoryStorageDriver(bucket string, input chan ObjectRequest) {
+func InMemoryStorageDriver(bucket string, input chan ObjectRequest, config GatewayConfig) {
 	objects := patricia.NewTrie()
 	for request := range input {
 		prefix := patricia.Prefix(request.path)
-		fmt.Println("objects:", objects)
 		switch request.requestType {
 		case "GET":
-			fmt.Println("GET: " + request.path)
 			request.callback <- objects.Get(prefix)
 		case "PUT":
-			fmt.Println("PUT: " + request.path)
 			objects.Insert(prefix, request.object)
 			request.callback <- nil
 		default:
@@ -194,3 +193,27 @@ func InMemoryStorageDriver(bucket string, input chan ObjectRequest) {
 		}
 	}
 }
+
+func SimpleFileStorageDriver(bucket string, input chan ObjectRequest, config GatewayConfig) {
+	storage := FileStorage{
+		RootDir: config.dataDir,
+	}
+	for request := range input {
+		switch request.requestType {
+		case "GET":
+			objectPath := path.Join(bucket, request.path)
+			object, err := storage.Get(objectPath)
+			if err != nil {
+				request.callback <- nil
+			} else {
+				request.callback <- object
+			}
+		case "PUT":
+			objectPath := path.Join(bucket, request.path)
+			storage.Put(objectPath, request.object)
+			request.callback <- nil
+		default:
+			request.callback <- errors.New("Unexpected message")
+		}
+	}
+}

gateway_test.go

@@ -6,17 +6,15 @@ import (
 	"io/ioutil"
 	"net/http"
 	"net/http/httptest"
+	"os"
 	"strings"
-	"testing"
 )
 
-type MySuite struct{}
+type GatewaySuite struct{}
 
-var _ = Suite(&MySuite{})
+var _ = Suite(&GatewaySuite{})
 
-func Test(t *testing.T) { TestingT(t) }
-
-func (s *MySuite) TestPrintsGateway(c *C) {
+func (s *GatewaySuite) TestPrintsGateway(c *C) {
 	// set up router with in memory storage driver
 	router := mux.NewRouter()
 	config := GatewayConfig{
@@ -59,7 +57,7 @@ func (s *MySuite) TestPrintsGateway(c *C) {
 
 type TestContext struct{}
 
-func (s *MySuite) TestBucketCreation(c *C) {
+func (s *GatewaySuite) TestBucketCreation(c *C) {
 	config := GatewayConfig{
 		StorageDriver:     InMemoryStorageDriver,
 		requestBucketChan: make(chan BucketRequest),
@@ -103,38 +101,50 @@ func (s *MySuite) TestBucketCreation(c *C) {
 	c.Assert(bucketB.GetName(context), Equals, "bucketB")
 }
 
-func (s *MySuite) TestInMemoryBucketOperations(c *C) {
-	// Test in memory bucket operations
-	config := GatewayConfig{
-		StorageDriver:     InMemoryStorageDriver,
-		requestBucketChan: make(chan BucketRequest),
+func (s *GatewaySuite) TestInMemoryBucketOperations(c *C) {
+	simpleFileStorageRootDir, err := makeTempTestDir()
+	c.Assert(err, IsNil)
+	defer os.RemoveAll(simpleFileStorageRootDir)
+	configs := []GatewayConfig{
+		GatewayConfig{
+			StorageDriver:     InMemoryStorageDriver,
+			requestBucketChan: make(chan BucketRequest),
+		},
+		GatewayConfig{
+			StorageDriver:     SimpleFileStorageDriver,
+			requestBucketChan: make(chan BucketRequest),
+			dataDir:           simpleFileStorageRootDir,
+		},
 	}
-	defer close(config.requestBucketChan)
-	go SynchronizedBucketDriver(config)
-	context := TestContext{}
+	for _, config := range configs {
+		defer close(config.requestBucketChan)
+		go SynchronizedBucketDriver(config)
+		context := TestContext{}
+
+		// get bucket
+		callback := make(chan Bucket)
+		config.requestBucketChan <- BucketRequest{
+			name:     "bucket",
+			context:  context,
+			callback: callback,
+		}
+		bucket := <-callback
+		c.Assert(bucket.GetName(context), Equals, "bucket")
+
+		// get missing value
+		nilResult, err := bucket.Get(context, "foo")
+		c.Assert(nilResult, IsNil)
+		c.Assert(err, Not(IsNil))
+		c.Assert(err.Error(), Equals, "Object not found")
+
+		// add new value
+		err = bucket.Put(context, "foo", []byte("bar"))
+		c.Assert(err, IsNil)
+
+		// retrieve value
+		barResult, err := bucket.Get(context, "foo")
+		c.Assert(err, IsNil)
+		c.Assert(string(barResult), Equals, "bar")
 
-	// get bucket
-	callback := make(chan Bucket)
-	config.requestBucketChan <- BucketRequest{
-		name:     "bucket",
-		context:  context,
-		callback: callback,
 	}
-	bucket := <-callback
-	c.Assert(bucket.GetName(context), Equals, "bucket")
-
-	// get missing value
-	nilResult, err := bucket.Get(context, "foo")
-	c.Assert(nilResult, IsNil)
-	c.Assert(err, Not(IsNil))
-	c.Assert(err.Error(), Equals, "Object not found")
-
-	// add new value
-	err = bucket.Put(context, "foo", []byte("bar"))
-	c.Assert(err, IsNil)
-
-	// retrieve value
-	barResult, err := bucket.Get(context, "foo")
-	c.Assert(err, IsNil)
-	c.Assert(string(barResult), Equals, "bar")
 }

setup_test.go

@@ -0,0 +1,8 @@
+package minio
+
+import (
+	. "gopkg.in/check.v1"
+	"testing"
+)
+
+func Test(t *testing.T) { TestingT(t) }

storage.go

@@ -6,6 +6,11 @@ import (
 	"net/http"
 )
 
+type ObjectStorage interface {
+	Get(path string) ([]byte, error)
+	Put(path string, object []byte) error
+}
+
 func RegisterStorageHandlers(router *mux.Router) {
 	router.HandleFunc("/storage/rpc", StorageHandler)
 }