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minio/pkg/server/server.go

198 lines
5.4 KiB

/*
* Mini Object Storage, (C) 2014 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 server
import (
"log"
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"os/user"
"path"
"reflect"
"github.com/minio-io/minio/pkg/api"
"github.com/minio-io/minio/pkg/api/web"
"github.com/minio-io/minio/pkg/server/httpserver"
mstorage "github.com/minio-io/minio/pkg/storage"
"github.com/minio-io/minio/pkg/storage/file"
"github.com/minio-io/minio/pkg/storage/memory"
)
// Config - http server parameters
type Config struct {
Domain string
Address string
TLS bool
CertFile string
KeyFile string
APIType interface{}
}
// MinioAPI - storage type donut, file, memory
type MinioAPI struct {
StorageType StorageType
}
// Web - web related
type Web struct {
Websocket bool // TODO
}
// StorageType - different storage types supported by minio
type StorageType int
// Storage types
const (
Memory = iota
File
Donut
)
func getHTTPChannels(configs []Config) (ctrlChans []chan<- string, statusChans []<-chan error) {
// a pair of control channels, we use these primarily to add to the lists above
var ctrlChan chan<- string
var statusChan <-chan error
for _, config := range configs {
switch k := config.APIType.(type) {
case MinioAPI:
{
// configure web server
var storage mstorage.Storage
var httpConfig = httpserver.Config{}
httpConfig.Address = config.Address
httpConfig.Websocket = false
httpConfig.TLS = config.TLS
if config.CertFile != "" {
httpConfig.CertFile = config.CertFile
}
if config.KeyFile != "" {
httpConfig.KeyFile = config.KeyFile
}
ctrlChans, statusChans, storage = getStorageChannels(k.StorageType)
// start minio api in a web server, pass storage driver into it
ctrlChan, statusChan, _ = httpserver.Start(api.HTTPHandler(config.Domain, storage), httpConfig)
ctrlChans = append(ctrlChans, ctrlChan)
statusChans = append(statusChans, statusChan)
}
case Web:
{
var httpConfig = httpserver.Config{}
httpConfig.Address = config.Address
httpConfig.TLS = config.TLS
httpConfig.CertFile = config.CertFile
httpConfig.KeyFile = config.KeyFile
httpConfig.Websocket = k.Websocket
ctrlChan, statusChan, _ = httpserver.Start(web.HTTPHandler(), httpConfig)
ctrlChans = append(ctrlChans, ctrlChan)
statusChans = append(statusChans, statusChan)
}
default:
log.Fatal("Invalid api type")
}
}
return
}
func getStorageChannels(storageType StorageType) (ctrlChans []chan<- string, statusChans []<-chan error, storage mstorage.Storage) {
// a pair of control channels, we use these primarily to add to the lists above
var ctrlChan chan<- string
var statusChan <-chan error
// instantiate storage
// preconditions:
// - storage type specified
// - any configuration for storage is populated
// postconditions:
// - storage driver is initialized
// - ctrlChans has channel to communicate to storage
// - statusChans has channel for messages coming from storage
switch {
case storageType == Memory:
{
ctrlChan, statusChan, storage = memory.Start()
ctrlChans = append(ctrlChans, ctrlChan)
statusChans = append(statusChans, statusChan)
}
case storageType == File:
{
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u, err := user.Current()
if err != nil {
return nil, nil, nil
}
root := path.Join(u.HomeDir, "minio-storage")
ctrlChan, statusChan, storage = file.Start(root)
ctrlChans = append(ctrlChans, ctrlChan)
statusChans = append(statusChans, statusChan)
}
default: // should never happen
log.Fatal("No storage driver found")
}
return
}
// Start - create channels
func Start(configs []Config) {
// reflected looping is necessary to remove dead channels from loop and not flood switch
ctrlChans, statusChans := getHTTPChannels(configs)
cases := createSelectCases(statusChans)
for len(cases) > 0 {
chosen, value, recvOk := reflect.Select(cases)
switch recvOk {
case true:
// Status Message Received
switch true {
case value.Interface() != nil:
// For any error received cleanup all existing channels and fail
for _, ch := range ctrlChans {
close(ch)
}
log.Fatal(value.Interface())
}
case false:
// Channel closed, remove from list
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var aliveStatusChans []<-chan error
for i, ch := range statusChans {
if i != chosen {
aliveStatusChans = append(aliveStatusChans, ch)
}
}
// create new select cases without defunct channel
statusChans = aliveStatusChans
cases = createSelectCases(statusChans)
}
}
}
// creates select cases for reflect to switch over dynamically
// this is necessary in order to remove dead channels and not flood
// the loop with closed channel errors
func createSelectCases(channels []<-chan error) []reflect.SelectCase {
cases := make([]reflect.SelectCase, len(channels))
for i, ch := range channels {
cases[i] = reflect.SelectCase{
Dir: reflect.SelectRecv,
Chan: reflect.ValueOf(ch),
}
}
return cases
}