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/*
* Minio Cloud Storage, (C) 2017 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 (
"fmt"
"net"
"net/url"
"path"
"sort"
"strconv"
"strings"
"github.com/minio/minio-go/pkg/set"
)
// EndpointType - enum for endpoint type.
type EndpointType int
const (
// PathEndpointType - path style endpoint type enum.
PathEndpointType EndpointType = iota + 1
// URLEndpointType - URL style endpoint type enum.
URLEndpointType
)
// Endpoint - any type of endpoint.
type Endpoint struct {
*url.URL
IsLocal bool
}
func (endpoint Endpoint) String() string {
if endpoint.Host == "" {
return endpoint.Path
}
return endpoint.URL.String()
}
// Type - returns type of endpoint.
func (endpoint Endpoint) Type() EndpointType {
if endpoint.Host == "" {
return PathEndpointType
}
return URLEndpointType
}
// SetHTTPS - sets secure http for URLEndpointType.
func (endpoint Endpoint) SetHTTPS() {
if endpoint.Host != "" {
endpoint.Scheme = "https"
}
}
// SetHTTP - sets insecure http for URLEndpointType.
func (endpoint Endpoint) SetHTTP() {
if endpoint.Host != "" {
endpoint.Scheme = "http"
}
}
// NewEndpoint - returns new endpoint based on given arguments.
func NewEndpoint(arg string) (Endpoint, error) {
// isEmptyPath - check whether given path is not empty.
isEmptyPath := func(path string) bool {
return path == "" || path == "." || path == "/" || path == `\`
}
if isEmptyPath(arg) {
return Endpoint{}, fmt.Errorf("empty or root endpoint is not supported")
}
var isLocal bool
u, err := url.Parse(arg)
if err == nil && u.Host != "" {
// URL style of endpoint.
// Valid URL style endpoint is
// - Scheme field must contain "http" or "https"
// - All field should be empty except Host and Path.
if !((u.Scheme == "http" || u.Scheme == "https") &&
u.User == nil && u.Opaque == "" && u.ForceQuery == false && u.RawQuery == "" && u.Fragment == "") {
return Endpoint{}, fmt.Errorf("invalid URL endpoint format")
}
host, port, err := net.SplitHostPort(u.Host)
if err != nil {
if !strings.Contains(err.Error(), "missing port in address") {
return Endpoint{}, fmt.Errorf("invalid URL endpoint format: %s", err)
}
host = u.Host
} else {
var p int
p, err = strconv.Atoi(port)
if err != nil {
return Endpoint{}, fmt.Errorf("invalid URL endpoint format: invalid port number")
} else if p < 1 || p > 65535 {
return Endpoint{}, fmt.Errorf("invalid URL endpoint format: port number must be between 1 to 65535")
}
}
if host == "" {
return Endpoint{}, fmt.Errorf("invalid URL endpoint format: empty host name")
}
// As this is path in the URL, we should use path package, not filepath package.
// On MS Windows, filepath.Clean() converts into Windows path style ie `/foo` becomes `\foo`
u.Path = path.Clean(u.Path)
if isEmptyPath(u.Path) {
return Endpoint{}, fmt.Errorf("empty or root path is not supported in URL endpoint")
}
// Get IPv4 address of the host.
hostIPs, err := getHostIP4(host)
if err != nil {
return Endpoint{}, err
}
// If intersection of two IP sets is not empty, then the host is local host.
isLocal = !localIP4.Intersection(hostIPs).IsEmpty()
} else {
u = &url.URL{Path: path.Clean(arg)}
isLocal = true
}
return Endpoint{
URL: u,
IsLocal: isLocal,
}, nil
}
// EndpointList - list of same type of endpoint.
type EndpointList []Endpoint
// Swap - helper method for sorting.
func (endpoints EndpointList) Swap(i, j int) {
endpoints[i], endpoints[j] = endpoints[j], endpoints[i]
}
// Len - helper method for sorting.
func (endpoints EndpointList) Len() int {
return len(endpoints)
}
// Less - helper method for sorting.
func (endpoints EndpointList) Less(i, j int) bool {
return endpoints[i].String() < endpoints[j].String()
}
// SetHTTPS - sets secure http for URLEndpointType.
func (endpoints EndpointList) SetHTTPS() {
for i := range endpoints {
endpoints[i].SetHTTPS()
}
}
// SetHTTP - sets insecure http for URLEndpointType.
func (endpoints EndpointList) SetHTTP() {
for i := range endpoints {
endpoints[i].SetHTTP()
}
}
// NewEndpointList - returns new endpoint list based on input args.
func NewEndpointList(args ...string) (endpoints EndpointList, err error) {
// isValidDistribution - checks whether given count is a valid distribution for erasure coding.
isValidDistribution := func(count int) bool {
return (count >= minErasureBlocks && count <= maxErasureBlocks && count%2 == 0)
}
// Check whether no. of args are valid for XL distribution.
if !isValidDistribution(len(args)) {
return nil, fmt.Errorf("A total of %d endpoints were found. For erasure mode it should be an even number between %d and %d", len(args), minErasureBlocks, maxErasureBlocks)
}
var endpointType EndpointType
var scheme string
uniqueArgs := set.NewStringSet()
// Loop through args and adds to endpoint list.
for i, arg := range args {
endpoint, err := NewEndpoint(arg)
if err != nil {
return nil, fmt.Errorf("'%s': %s", arg, err.Error())
}
// All endpoints have to be same type and scheme if applicable.
if i == 0 {
endpointType = endpoint.Type()
scheme = endpoint.Scheme
} else if endpoint.Type() != endpointType {
return nil, fmt.Errorf("mixed style endpoints are not supported")
} else if endpoint.Scheme != scheme {
return nil, fmt.Errorf("mixed scheme is not supported")
}
arg = endpoint.String()
if uniqueArgs.Contains(arg) {
return nil, fmt.Errorf("duplicate endpoints found")
}
uniqueArgs.Add(arg)
endpoints = append(endpoints, endpoint)
}
sort.Sort(endpoints)
return endpoints, nil
}
// CreateEndpoints - validates and creates new endpoints for given args.
func CreateEndpoints(serverAddr string, args ...string) (string, EndpointList, SetupType, error) {
var endpoints EndpointList
var setupType SetupType
var err error
// Check whether serverAddr is valid for this host.
if err = CheckLocalServerAddr(serverAddr); err != nil {
return serverAddr, endpoints, setupType, err
}
_, serverAddrPort := mustSplitHostPort(serverAddr)
// For single arg, return FS setup.
if len(args) == 1 {
var endpoint Endpoint
endpoint, err = NewEndpoint(args[0])
if err != nil {
return serverAddr, endpoints, setupType, err
}
if endpoint.Type() != PathEndpointType {
return serverAddr, endpoints, setupType, fmt.Errorf("use path style endpoint for FS setup")
}
endpoints = append(endpoints, endpoint)
setupType = FSSetupType
return serverAddr, endpoints, setupType, nil
}
// Convert args to endpoints
if endpoints, err = NewEndpointList(args...); err != nil {
return serverAddr, endpoints, setupType, err
}
// Return XL setup when all endpoints are path style.
if endpoints[0].Type() == PathEndpointType {
setupType = XLSetupType
return serverAddr, endpoints, setupType, nil
}
// Here all endpoints are URL style.
endpointPathSet := set.NewStringSet()
localEndpointCount := 0
localServerAddrSet := set.NewStringSet()
localPortSet := set.NewStringSet()
for _, endpoint := range endpoints {
endpointPathSet.Add(endpoint.Path)
if endpoint.IsLocal {
localServerAddrSet.Add(endpoint.Host)
var port string
_, port, err = net.SplitHostPort(endpoint.Host)
if err != nil {
port = serverAddrPort
}
localPortSet.Add(port)
localEndpointCount++
}
}
// No local endpoint found.
if localEndpointCount == 0 {
return serverAddr, endpoints, setupType, fmt.Errorf("no endpoint found for this host")
}
// Check whether same path is not used in endpoints of a host.
{
pathIPMap := make(map[string]set.StringSet)
for _, endpoint := range endpoints {
var host string
host, _, err = net.SplitHostPort(endpoint.Host)
if err != nil {
host = endpoint.Host
}
hostIPSet, _ := getHostIP4(host)
if IPSet, ok := pathIPMap[endpoint.Path]; ok {
if !IPSet.Intersection(hostIPSet).IsEmpty() {
err = fmt.Errorf("path '%s' can not be served by different port on same address", endpoint.Path)
return serverAddr, endpoints, setupType, err
}
pathIPMap[endpoint.Path] = IPSet.Union(hostIPSet)
} else {
pathIPMap[endpoint.Path] = hostIPSet
}
}
}
// Check whether serverAddrPort matches at least in one of port used in local endpoints.
{
if !localPortSet.Contains(serverAddrPort) {
if len(localPortSet) > 1 {
err = fmt.Errorf("port number in server address must match with one of the port in local endpoints")
} else {
err = fmt.Errorf("server address and local endpoint have different ports")
}
return serverAddr, endpoints, setupType, err
}
}
// All endpoints are pointing to local host
if len(endpoints) == localEndpointCount {
// If all endpoints have same port number, then this is XL setup using URL style endpoints.
if len(localPortSet) == 1 {
if len(localServerAddrSet) > 1 {
// TODO: Eventhough all endpoints are local, the local host is referred by different IP/name.
// eg '172.0.0.1', 'localhost' and 'mylocalhostname' point to same local host.
//
// In this case, we bind to 0.0.0.0 ie to all interfaces.
// The actual way to do is bind to only IPs in uniqueLocalHosts.
serverAddr = net.JoinHostPort("", serverAddrPort)
}
endpointPaths := endpointPathSet.ToSlice()
endpoints, _ = NewEndpointList(endpointPaths...)
setupType = XLSetupType
return serverAddr, endpoints, setupType, nil
}
// Eventhough all endpoints are local, but those endpoints use different ports.
// This means it is DistXL setup.
} else {
// This is DistXL setup.
// Check whether local server address are not 127.x.x.x
for _, localServerAddr := range localServerAddrSet.ToSlice() {
host, _, err := net.SplitHostPort(localServerAddr)
if err != nil {
host = localServerAddr
}
ipList, err := getHostIP4(host)
fatalIf(err, "unexpected error when resolving host '%s'", host)
// Filter ipList by IPs those start with '127.'.
loopBackIPs := ipList.FuncMatch(func(ip string, matchString string) bool {
return strings.HasPrefix(ip, "127.")
}, "")
// If loop back IP is found and ipList contains only loop back IPs, then error out.
if len(loopBackIPs) > 0 && len(loopBackIPs) == len(ipList) {
err = fmt.Errorf("'%s' resolves to loopback address is not allowed for distributed XL", localServerAddr)
return serverAddr, endpoints, setupType, err
}
}
}
// Add missing port in all endpoints.
for i := range endpoints {
_, port, err := net.SplitHostPort(endpoints[i].Host)
if err != nil {
endpoints[i].Host = net.JoinHostPort(endpoints[i].Host, serverAddrPort)
} else if endpoints[i].IsLocal && serverAddrPort != port {
// If endpoint is local, but port is different than serverAddrPort, then make it as remote.
endpoints[i].IsLocal = false
}
}
setupType = DistXLSetupType
return serverAddr, endpoints, setupType, nil
}
// GetRemotePeers - get hosts information other than this minio service.
func GetRemotePeers(endpoints EndpointList) []string {
peerSet := set.NewStringSet()
for _, endpoint := range endpoints {
if endpoint.Type() != URLEndpointType {
continue
}
peer := endpoint.Host
if endpoint.IsLocal {
if _, port := mustSplitHostPort(peer); port == globalMinioPort {
continue
}
}
peerSet.Add(peer)
}
return peerSet.ToSlice()
}