contentdb replaced by new mimedb

pkg/contentdb/Makefile

@@ -1,26 +0,0 @@
-# Generate db.go from db.json downloaded nodejs mime-db project.
-# NOTE: Autogenerated db.go needs to be vet proofed. \
-	Manually edit json -> JSON for all variable names
-all: checkdeps download build
-
-# go-bindata generates go source from any data file.
-checkdeps:
-	@go get -u github.com/jteeuwen/go-bindata/...
-
-# Download db.json from NodeJS's mime-db project. It is under MIT license.
-download: checkdeps
-	@mkdir db
-	@wget -nv https://cdn.rawgit.com/jshttp/mime-db/master/db.json -O db/db.json
-
-
-# After generating db.go, clean up downloaded db.json.
-build: download
-	@go-bindata -pkg contentdb -o db.go db
-	@rm -fv db/db.json
-	@rm -rfv db
-
-# Clean auto-generated files and backups.
-clean:
-	@rm -rf db.go
-	@rm -f *~
-

pkg/contentdb/contentdb.go

@@ -1,118 +0,0 @@
-/*
- * mime-db: Mime Database, (C) 2015 Minio, Inc.
- *
- * 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 contentdb is a database of file extension to mime content-type.
-// Definitions are imported from NodeJS mime-db project under MIT license.
-package contentdb
-
-import (
-	"errors"
-	"fmt"
-	"strings"
-	"sync"
-
-	"encoding/json"
-)
-
-var (
-	// Internal lock.
-	mutex = &sync.Mutex{}
-
-	// Make note of initialization.
-	isInitialized = false
-
-	// Database of extension:content-type.
-	extDB map[string]string
-)
-
-// Load JSON data from gobindata and parse them into extDB.
-func loadDB() error {
-	// Structure of JSON data from mime-db project.
-	type dbEntry struct {
-		Source       string   `json:"source"`
-		Compressible bool     `json:"compresible"`
-		Extensions   []string `json:"extensions"`
-	}
-
-	// Access embedded "db.json" inside go-bindata.
-	jsonDB, e := Asset("db/db.json")
-	if e != nil {
-		return e
-	}
-
-	// Convert db.json into go's typed structure.
-	db := make(map[string]dbEntry)
-	if e := json.Unmarshal(jsonDB, &db); e != nil {
-		return e
-	}
-
-	// Generate a new database from mime-db.
-	for key, val := range db {
-		if len(val.Extensions) > 0 {
-			/* Denormalize - each extension has its own
-			unique content-type now. Looks will be fast. */
-			for _, ext := range val.Extensions {
-				/* Single extension type may map to
-				multiple content-types. In that case,
-				simply prefer the longest content-type
-				to maintain some level of
-				consistency. Only guarantee is,
-				whatever content type is assigned, it
-				is appropriate and valid type. */
-				if strings.Compare(extDB[ext], key) < 0 {
-					extDB[ext] = key
-				}
-			}
-		}
-	}
-	return nil
-}
-
-// Init initializes contentdb for lookups. JSON structure is parsed into a simple map of extension and content-type.
-func Init() error {
-	mutex.Lock()
-	defer mutex.Unlock()
-
-	if !isInitialized {
-		var e error
-		extDB = make(map[string]string)
-
-		if !isInitialized {
-			e = loadDB()
-		}
-		isInitialized = true
-		return e
-	}
-	return nil
-}
-
-// Lookup returns matching content-type for known types of file extensions.
-func Lookup(extension string) (contentType string, e error) {
-	if !isInitialized {
-		return "", errors.New("contentdb is not initialized")
-	}
-
-	return extDB[extension], e
-}
-
-// MustLookup returns matching content-type for known types of file extensions. In case of error, it panics.
-func MustLookup(extension string) (contentType string) {
-	var e error
-	if contentType, e = Lookup(extension); e != nil {
-		panic(fmt.Sprintf("Lookup failed: %s\n", e))
-	}
-	return contentType
-}

pkg/mimedb/Makefile

@@ -0,0 +1,17 @@
+# Generate db.go from db.json downloaded nodejs mime-db project.
+# NOTE: Autogenerated db.go needs to be vet proofed. \
+	Manually edit json -> JSON for all variable names
+all: download build
+
+# Download db.json from NodeJS's mime-db project. It is under MIT license.
+download:
+	@mkdir db
+	@wget -nv -q https://cdn.rawgit.com/jshttp/mime-db/master/db.json -O db/db.json
+
+
+# After generating db.go, clean up downloaded db.json.
+build: download
+	@go run util/gen-db.go db/db.json > db.go
+	@rm -f db/db.json
+	@rm -rf db
+	@echo Generated \"db.go\".

pkg/mimedb/db_test.go

@@ -14,12 +14,12 @@
  * limitations under the License.
  */
 
-package contentdb_test
+package mimedb_test
 
 import (
 	"testing"
 
-	"github.com/minio/minio/pkg/contentdb"
+	"github.com/minio/minio/pkg/mimedb"
 
 	. "gopkg.in/check.v1"
 )
@@ -31,16 +31,7 @@ type MySuite struct{}
 var _ = Suite(&MySuite{})
 
 func (s *MySuite) TestLookup(c *C) {
-	// Test initializing.
-	e := contentdb.Init()
-	c.Assert(e, IsNil)
-
-	// Test MustLookup.
-	contentType, e := contentdb.Lookup("exe")
-	c.Assert(e, IsNil)
-	c.Assert(contentType, Not(Equals), "")
-
 	// Test MustLookup.
-	contentType = contentdb.MustLookup("exe")
+	contentType := mimedb.DB["exe"].ContentType
 	c.Assert(contentType, Not(Equals), "")
 }

pkg/mimedb/util/gen-db.go

@@ -0,0 +1,146 @@
+/*
+ * mimedb: Mime Database, (C) 2015 Minio, Inc.
+ *
+ * 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 mimedb is a database of file extension to mime content-type.
+// Definitions are imported from NodeJS mime-db project under MIT license.
+
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"strings"
+	"text/template"
+)
+
+const progTempl = `// DO NOT EDIT THIS FILE. IT IS AUTO-GENERATED BY "gen-db.go". //
+/*
+ * mimedb: Mime Database, (C) 2016 Minio, Inc.
+ *
+ * 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 mimedb is a database of file extension to mime content-type.
+// Definitions are imported from NodeJS mime-db project under MIT license.
+package mimedb
+
+// Mime is a collection of mime types with extension as key and content-type as value.
+var DB = map[string]struct {
+	ContentType  string
+	Compressible bool
+}{
+{{range $extension, $entry := . }}	"{{$extension}}": {
+		ContentType:  "{{$entry.ContentType}}",
+		Compressible: {{$entry.Compressible}},
+	},
+{{end}}}
+`
+
+type mimeEntry struct {
+	ContentType  string `json:"contentType"`
+	Compressible bool   `json:"compresible"`
+}
+
+type mimeDB map[string]mimeEntry
+
+var ()
+
+//  JSON data from gobindata and parse them into extDB.
+func convertDB(jsonFile string) (mimeDB, error) {
+	// Structure of JSON data from mime-db project.
+	type dbEntry struct {
+		Source       string   `json:"source"`
+		Compressible bool     `json:"compresible"`
+		Extensions   []string `json:"extensions"`
+	}
+
+	// Access embedded "db.json" inside go-bindata.
+	jsonDB, err := ioutil.ReadFile(jsonFile)
+	if err != nil {
+		return nil, err
+	}
+
+	// Convert db.json into go's typed structure.
+	db := make(map[string]dbEntry)
+	if err := json.Unmarshal(jsonDB, &db); err != nil {
+		return nil, err
+	}
+
+	mDB := make(mimeDB)
+
+	// Generate a new database from mime-db.
+	for key, val := range db {
+		if len(val.Extensions) > 0 {
+			/* Denormalize - each extension has its own
+			unique content-type now. Looks will be fast. */
+			for _, ext := range val.Extensions {
+				/* Single extension type may map to
+				multiple content-types. In that case,
+				simply prefer the longest content-type
+				to maintain some level of
+				consistency. Only guarantee is,
+				whatever content type is assigned, it
+				is appropriate and valid type. */
+				if strings.Compare(mDB[ext].ContentType, key) < 0 {
+					mDB[ext] = mimeEntry{
+						ContentType:  key,
+						Compressible: val.Compressible,
+					}
+				}
+			}
+		}
+	}
+	return mDB, nil
+}
+
+func main() {
+	// Take input json file from command-line".
+	if len(os.Args) != 2 {
+		fmt.Print("Syntax:\n\tgen-db /path/to/db.json\n")
+		os.Exit(1)
+	}
+
+	// Load and convert db.json into new database with extension
+	// as key.
+	mDB, err := convertDB(os.Args[1])
+	if err != nil {
+		panic(err)
+	}
+
+	// Generate db embedded go program.
+	tmpl := template.New("mimedb")
+	mimeTmpl, err := tmpl.Parse(progTempl)
+	if err != nil {
+		panic(err)
+	}
+
+	err = mimeTmpl.Execute(os.Stdout, mDB)
+	if err != nil {
+		panic(err)
+	}
+}