minio/cmd/utils.go
2016-10-21 01:25:17 -07:00

200 lines
5.3 KiB
Go

/*
* Minio Cloud Storage, (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 cmd
import (
"encoding/base64"
"encoding/xml"
"fmt"
"io"
"net/http"
"os"
"strings"
"encoding/json"
"github.com/pkg/profile"
)
// make a copy of http.Header
func cloneHeader(h http.Header) http.Header {
h2 := make(http.Header, len(h))
for k, vv := range h {
vv2 := make([]string, len(vv))
copy(vv2, vv)
h2[k] = vv2
}
return h2
}
// checkDuplicates - function to validate if there are duplicates in a slice of strings.
func checkDuplicateStrings(list []string) error {
// Empty lists are not allowed.
if len(list) == 0 {
return errInvalidArgument
}
// Empty keys are not allowed.
for _, key := range list {
if key == "" {
return errInvalidArgument
}
}
listMaps := make(map[string]int)
// Navigate through each configs and count the entries.
for _, key := range list {
listMaps[key]++
}
// Validate if there are any duplicate counts.
for key, count := range listMaps {
if count != 1 {
return fmt.Errorf("Duplicate key: \"%s\" found of count: \"%d\"", key, count)
}
}
// No duplicates.
return nil
}
// checkDuplicates - function to validate if there are duplicates in a slice of endPoints.
func checkDuplicateEndPoints(list []storageEndPoint) error {
var strs []string
for _, ep := range list {
strs = append(strs, ep.String())
}
return checkDuplicateStrings(strs)
}
// Find local node through the command line arguments. Returns in
// `host:port` format.
func getLocalAddress(srvCmdConfig serverCmdConfig) string {
if !srvCmdConfig.isDistXL {
return srvCmdConfig.serverAddr
}
for _, ep := range srvCmdConfig.endPoints {
// Validates if remote disk is local.
if isLocalStorage(ep) {
return fmt.Sprintf("%s:%d", ep.host, ep.port)
}
}
return ""
}
// xmlDecoder provide decoded value in xml.
func xmlDecoder(body io.Reader, v interface{}, size int64) error {
var lbody io.Reader
if size > 0 {
lbody = io.LimitReader(body, size)
} else {
lbody = body
}
d := xml.NewDecoder(lbody)
return d.Decode(v)
}
// checkValidMD5 - verify if valid md5, returns md5 in bytes.
func checkValidMD5(md5 string) ([]byte, error) {
return base64.StdEncoding.DecodeString(strings.TrimSpace(md5))
}
/// http://docs.aws.amazon.com/AmazonS3/latest/dev/UploadingObjects.html
const (
// maximum object size per PUT request is 5GiB
maxObjectSize = 1024 * 1024 * 1024 * 5
// minimum Part size for multipart upload is 5MB
minPartSize = 1024 * 1024 * 5
// maximum Part ID for multipart upload is 10000 (Acceptable values range from 1 to 10000 inclusive)
maxPartID = 10000
)
// isMaxObjectSize - verify if max object size
func isMaxObjectSize(size int64) bool {
return size > maxObjectSize
}
// Check if part size is more than or equal to minimum allowed size.
func isMinAllowedPartSize(size int64) bool {
return size >= minPartSize
}
// isMaxPartNumber - Check if part ID is greater than the maximum allowed ID.
func isMaxPartID(partID int) bool {
return partID > maxPartID
}
func contains(stringList []string, element string) bool {
for _, e := range stringList {
if e == element {
return true
}
}
return false
}
// urlPathSplit - split url path into bucket and object components.
func urlPathSplit(urlPath string) (bucketName, prefixName string) {
if urlPath == "" {
return urlPath, ""
}
urlPath = strings.TrimPrefix(urlPath, "/")
i := strings.Index(urlPath, "/")
if i != -1 {
return urlPath[:i], urlPath[i+1:]
}
return urlPath, ""
}
// Starts a profiler returns nil if profiler is not enabled, caller needs to handle this.
func startProfiler(profiler string) interface {
Stop()
} {
// Set ``MINIO_PROFILE_DIR`` to the directory where profiling information should be persisted
profileDir := os.Getenv("MINIO_PROFILE_DIR")
// Enable profiler if ``MINIO_PROFILER`` is set. Supported options are [cpu, mem, block].
switch profiler {
case "cpu":
return profile.Start(profile.CPUProfile, profile.NoShutdownHook, profile.ProfilePath(profileDir))
case "mem":
return profile.Start(profile.MemProfile, profile.NoShutdownHook, profile.ProfilePath(profileDir))
case "block":
return profile.Start(profile.BlockProfile, profile.NoShutdownHook, profile.ProfilePath(profileDir))
default:
return nil
}
}
// Global profiler to be used by service go-routine.
var globalProfiler interface {
Stop()
}
// dump the request into a string in JSON format.
func dumpRequest(r *http.Request) string {
header := cloneHeader(r.Header)
header.Set("Host", r.Host)
req := struct {
Method string `json:"method"`
Path string `json:"path"`
Query string `json:"query"`
Header http.Header `json:"header"`
}{r.Method, r.URL.Path, r.URL.RawQuery, header}
jsonBytes, err := json.Marshal(req)
if err != nil {
return "<error dumping request>"
}
return string(jsonBytes)
}