/
client.go
155 lines (139 loc) · 3.82 KB
/
client.go
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package server_register
import (
"context"
"fmt"
retry "github.com/grpc-ecosystem/go-grpc-middleware/retry"
"github.com/reyukari/server-register/loadbalence"
"github.com/reyukari/server-register/proto"
clientv3 "go.etcd.io/etcd/client/v3"
"go.uber.org/zap"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/credentials/insecure"
"google.golang.org/grpc/keepalive"
"google.golang.org/grpc/resolver"
"google.golang.org/protobuf/types/known/timestamppb"
"sync"
"time"
)
var kacp = keepalive.ClientParameters{
Time: 10 * time.Second, // send pings every 10 seconds if there is no activity
Timeout: time.Second, // wait 1 second for ping ack before considering the connection dead
PermitWithoutStream: true, // send pings even without active streams
}
type Client struct {
hostname string
registerAddr string
currentTaskId int32
client proto.RegisterClient
ctx context.Context
cancel context.CancelFunc
once sync.Once
}
// NewClient returns the pointer of the Client structure
func NewClient(addr string) (*Client, error) {
hostname, err := GetHostName()
if err != nil {
zap.S().Fatal(err)
}
r, err := loadbalence.NewUsageLB(
loadbalence.SetName(hostname),
loadbalence.SetLoadBalancingPolicy(loadbalence.UsageLB),
loadbalence.SetEtcdConf(clientv3.Config{
Endpoints: []string{DefaultEtcdUri},
DialTimeout: time.Second * 5,
}))
if err != nil {
zap.S().Fatal(err)
}
resolver.Register(r)
ctx, cancel := context.WithCancel(context.Background())
c := &Client{
hostname: hostname,
registerAddr: addr,
currentTaskId: 0,
ctx: ctx,
cancel: cancel,
}
opts := []retry.CallOption{
retry.WithBackoff(retry.BackoffLinear(100 * time.Millisecond)),
retry.WithCodes(codes.NotFound, codes.Aborted),
}
cc, err := grpc.Dial(addr, grpc.WithTransportCredentials(insecure.NewCredentials()), grpc.WithDefaultServiceConfig(fmt.Sprintf(`{"LoadBalancingPolicy": "%s"}`, loadbalence.UsageLB)), grpc.WithUnaryInterceptor(retry.UnaryClientInterceptor(opts...)))
if err != nil {
zap.S().Error(err)
return nil, err
}
c.client = proto.NewRegisterClient(cc)
c.register()
go c.timer()
return c, nil
}
func (c *Client) Close() {
c.once.Do(func() {
c.cancel()
})
}
func (c *Client) DoneSignal() <-chan struct{} {
return c.ctx.Done()
}
func (c *Client) timer() {
defer c.Close()
tick := time.NewTicker(time.Second * 1)
defer tick.Stop()
for {
select {
case <-tick.C:
if err := c.task(); err != nil {
return
}
case <-c.ctx.Done():
return
}
}
}
func (c *Client) register() {
//timestamp, err := ptypes.TimestampProto(time.Now())
//if err != nil {
// panic(err)
//}
timestamp := timestamppb.New(time.Now())
if _, err := c.client.Register(
context.Background(),
&proto.RegisterRequest{Hostname: c.hostname, Time: timestamp},
retry.WithMax(3),
retry.WithPerRetryTimeout(1*time.Second),
); err != nil {
zap.S().Error(err)
}
}
func (c *Client) task() (err error) {
var reply *proto.PullTaskReply
if reply, err = c.client.PullTask(
context.Background(),
&proto.PullTaskRequest{Hostname: c.hostname},
retry.WithMax(3),
retry.WithPerRetryTimeout(1*time.Second),
); err != nil {
zap.S().Error(err)
return err
}
zap.S().Info("reply:", reply)
if reply.Task.TaskId == 0 || c.currentTaskId >= reply.Task.TaskId {
return nil
}
c.currentTaskId = reply.Task.TaskId
if len(reply.Task.Command) == 0 {
return nil
}
var out string
if out, err = Exec(reply.Task.Command); err != nil {
zap.S().Error(err)
return err
}
if _, err = c.client.CompleteTask(context.Background(), &proto.CompleteTaskRequest{Hostname: c.hostname, TaskId: reply.Task.TaskId, OutPut: out}, retry.WithMax(3), retry.WithPerRetryTimeout(1*time.Second)); err != nil {
zap.S().Error(err)
return err
}
return nil
}