seaweedfs/weed/server/filer_server.go

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package weed_server
import (
"math/rand"
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"net/http"
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"strconv"
"sync"
"time"
"github.com/chrislusf/seaweedfs/weed/filer"
"github.com/chrislusf/seaweedfs/weed/filer/cassandra_store"
"github.com/chrislusf/seaweedfs/weed/filer/embedded_filer"
"github.com/chrislusf/seaweedfs/weed/filer/flat_namespace"
"github.com/chrislusf/seaweedfs/weed/filer/redis_store"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/security"
"github.com/chrislusf/seaweedfs/weed/storage"
"github.com/chrislusf/seaweedfs/weed/util"
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)
type FilerServer struct {
port string
master string
mnLock sync.RWMutex
collection string
defaultReplication string
redirectOnRead bool
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disableDirListing bool
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secret security.Secret
filer filer.Filer
masterNodes *storage.MasterNodes
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}
func NewFilerServer(r *http.ServeMux, ip string, port int, master string, dir string, collection string,
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replication string, redirectOnRead bool, disableDirListing bool,
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secret string,
cassandra_server string, cassandra_keyspace string,
redis_server string, redis_password string, redis_database int,
) (fs *FilerServer, err error) {
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fs = &FilerServer{
master: master,
collection: collection,
defaultReplication: replication,
redirectOnRead: redirectOnRead,
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disableDirListing: disableDirListing,
port: ip + ":" + strconv.Itoa(port),
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}
if cassandra_server != "" {
cassandra_store, err := cassandra_store.NewCassandraStore(cassandra_keyspace, cassandra_server)
if err != nil {
glog.Fatalf("Can not connect to cassandra server %s with keyspace %s: %v", cassandra_server, cassandra_keyspace, err)
}
fs.filer = flat_namespace.NewFlatNamespaceFiler(master, cassandra_store)
} else if redis_server != "" {
redis_store := redis_store.NewRedisStore(redis_server, redis_password, redis_database)
fs.filer = flat_namespace.NewFlatNamespaceFiler(master, redis_store)
} else {
if fs.filer, err = embedded_filer.NewFilerEmbedded(master, dir); err != nil {
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glog.Fatalf("Can not start filer in dir %s : %v", dir, err)
return
}
r.HandleFunc("/admin/mv", fs.moveHandler)
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}
r.HandleFunc("/", fs.filerHandler)
go func() {
connected := true
fs.masterNodes = storage.NewMasterNodes(fs.master)
glog.V(0).Infof("Filer server bootstraps with master %s", fs.getMasterNode())
//force initialize with all available master nodes
fs.masterNodes.FindMaster()
for {
glog.V(4).Infof("Filer server sending to master %s", fs.getMasterNode())
master, err := fs.detectHealthyMaster(fs.getMasterNode())
if err == nil {
if !connected {
connected = true
if fs.getMasterNode() != master {
fs.setMasterNode(master)
}
glog.V(0).Infoln("Filer Server Connected with master at", master)
}
} else {
glog.V(1).Infof("Filer Server Failed to talk with master %s: %v", fs.getMasterNode(), err)
if connected {
connected = false
}
}
if connected {
time.Sleep(time.Duration(float32(10*1e3)*(1+rand.Float32())) * time.Millisecond)
} else {
time.Sleep(time.Duration(float32(10*1e3)*0.25) * time.Millisecond)
}
}
}()
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return fs, nil
}
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func (fs *FilerServer) jwt(fileId string) security.EncodedJwt {
return security.GenJwt(fs.secret, fileId)
}
func (fs *FilerServer) getMasterNode() string {
fs.mnLock.RLock()
defer fs.mnLock.RUnlock()
return fs.master
}
func (fs *FilerServer) setMasterNode(masterNode string) {
fs.mnLock.Lock()
defer fs.mnLock.Unlock()
fs.master = masterNode
}
func (fs *FilerServer) detectHealthyMaster(masterNode string) (master string, e error) {
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if e = checkMaster(masterNode); e != nil {
fs.masterNodes.Reset()
for i := 0; i <= 3; i++ {
master, e = fs.masterNodes.FindMaster()
if e != nil {
continue
} else {
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if e = checkMaster(masterNode); e == nil {
break
}
}
}
} else {
master = masterNode
}
return
}
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func checkMaster(masterNode string) error {
statUrl := "http://" + masterNode + "/stats"
glog.V(4).Infof("Connecting to %s ...", statUrl)
_, e := util.Get(statUrl)
return e
}