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master_grpc_server.go
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master_grpc_server.go
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package master
import (
"fmt"
"io"
"io/ioutil"
"log"
"os"
"path/filepath"
"strings"
"time"
"context"
"github.com/chrislusf/gleam/pb"
"github.com/golang/protobuf/proto"
"github.com/hashicorp/golang-lru"
)
type MasterServer struct {
Topology *Topology
statusCache *lru.Cache
logDirectory string
startTime time.Time
}
func newMasterServer(logDirectory string) *MasterServer {
m := &MasterServer{
Topology: NewTopology(),
logDirectory: logDirectory,
startTime: time.Now(),
}
m.statusCache, _ = lru.NewWithEvict(512, m.onCacheEvict)
if strings.HasSuffix(m.logDirectory, "/") {
m.logDirectory = strings.TrimSuffix(m.logDirectory, "/")
}
m.onStartup()
return m
}
func (s *MasterServer) GetResources(ctx context.Context, in *pb.ComputeRequest) (*pb.AllocationResult, error) {
var err error
dcName := in.GetDataCenter()
if dcName == "" {
dcName, err = s.Topology.allocateDataCenter(in.GetComputeResources())
if err != nil {
return nil, err
}
}
dc, hasDc := s.Topology.GetDataCenter(dcName)
if !hasDc {
return nil, fmt.Errorf("Failed to find existing data center: %s", dcName)
}
allocations := s.Topology.findServers(dc, in.GetComputeResources())
log.Printf("%v requests %+v, allocated %+v", in.FlowHashCode, in.GetComputeResources(), allocations)
return &pb.AllocationResult{
Allocations: allocations,
}, nil
}
func (s *MasterServer) SendHeartbeat(stream pb.GleamMaster_SendHeartbeatServer) error {
var location *pb.Location
for {
heartbeat, err := stream.Recv()
if err == nil {
if location == nil {
location = heartbeat.Location
log.Printf("added agent: %v", location)
}
} else {
if location != nil {
s.Topology.deleteAgentInformation(location)
}
log.Printf("lost agent: %v", location)
if err == io.EOF {
return nil
}
if err != nil {
return err
}
}
s.Topology.UpdateAgentInformation(heartbeat)
}
}
func (s *MasterServer) SendFlowExecutionStatus(stream pb.GleamMaster_SendFlowExecutionStatusServer) (err error) {
var id uint32
defer func() {
if id == 0 {
return
}
status, ok := s.statusCache.Get(id)
if !ok {
return
}
fes := status.(*pb.FlowExecutionStatus)
if err != nil && err != io.EOF {
fes.Error = err.Error()
}
if fes.Driver.StopTime == 0 {
fes.Driver.StopTime = time.Now().UnixNano()
}
s.statusCache.Add(id, fes)
data, _ := proto.Marshal(fes)
ioutil.WriteFile(fmt.Sprintf("%s/f%d.log", s.logDirectory, id), data, 0644)
}()
for {
status, err := stream.Recv()
if err == io.EOF {
return nil
}
if err != nil {
return err
}
id = status.GetId()
s.statusCache.Add(id, status)
}
}
func (s *MasterServer) onStartup() {
files, _ := filepath.Glob(fmt.Sprintf("%s/f[0-9]*\\.log", s.logDirectory))
for _, f := range files {
data, _ := ioutil.ReadFile(f)
status := &pb.FlowExecutionStatus{}
if err := proto.Unmarshal(data, status); err == nil {
// println("loading", f, "for", status.GetId())
s.statusCache.Add(status.GetId(), status)
} else {
os.Remove(f)
}
}
}
func (s *MasterServer) onCacheEvict(key interface{}, value interface{}) {
id := key.(uint32)
os.Remove(fmt.Sprintf("%s/f%d.log", s.logDirectory, id))
}