/
gateway.go
263 lines (238 loc) · 6.52 KB
/
gateway.go
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/*
* Copyright 2022 Holoinsight Project Authors. Licensed under Apache-2.0.
*/
package gateway
import (
"context"
"crypto/tls"
"crypto/x509"
"encoding/base64"
"fmt"
"github.com/traas-stack/holoinsight-agent/pkg/logger"
"github.com/traas-stack/holoinsight-agent/pkg/model"
pb2 "github.com/traas-stack/holoinsight-agent/pkg/server/gateway/pb"
commonpb "github.com/traas-stack/holoinsight-agent/pkg/server/pb"
"google.golang.org/grpc"
"google.golang.org/grpc/backoff"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/credentials/insecure"
_ "google.golang.org/grpc/encoding/gzip"
"google.golang.org/grpc/keepalive"
"google.golang.org/protobuf/types/known/emptypb"
"time"
)
const (
pingTimeout = 3 * time.Second
reconnectInterval = 10 * time.Minute
delayCloseTimeout = 1 * time.Minute
compressThreshold = 10
defaultCompression = "gzip"
)
type (
Config struct {
Addr string
Secure bool
CaCert string
CaCertBase64 string
ServerName string
Apikey string
}
Service struct {
config Config
conn *grpc.ClientConn
stop chan struct{}
}
)
func New(config Config) (*Service, error) {
conn, err := newConn(config)
if err != nil {
return nil, err
}
s := &Service{
config: config,
conn: conn,
stop: make(chan struct{}),
}
return s, nil
}
func (s *Service) Start() {
// 立即触发一个grpc请求, 如果失败了只是记录一下日志不做其他处理
// 为的是不让conn为nil 利用grpc的自动重连功能 可能可以恢复正常
ctx, cancel := context.WithTimeout(context.Background(), pingTimeout)
defer cancel()
ping(ctx, s.conn)
go s.reconnectLoop()
}
func ping(ctx context.Context, conn *grpc.ClientConn) {
c := pb2.NewGatewayServiceClient(conn)
_, err := c.Ping(ctx, &emptypb.Empty{})
if err != nil {
logger.Errorf("ping gateway error %+v", err)
}
}
func (s *Service) reconnectLoop() {
timer := time.NewTimer(reconnectInterval)
defer timer.Stop()
for {
select {
case <-timer.C:
s.reconnect()
timer.Reset(reconnectInterval)
case <-s.stop:
conn := s.conn
if conn != nil {
conn.Close()
}
break
}
}
}
func (s *Service) reconnect() {
conn, err := newConn(s.config)
if err != nil {
logger.Errorf("reconnect error %+v", err)
return
}
ctx, cancel := context.WithTimeout(context.Background(), pingTimeout)
defer cancel()
ping(ctx, conn)
old := s.conn
s.conn = conn
delayClose(old)
}
func delayClose(conn *grpc.ClientConn) {
if conn != nil {
time.AfterFunc(delayCloseTimeout, func() {
conn.Close()
})
}
}
func (s *Service) Stop() {
conn := s.conn
s.conn = nil
delayClose(conn)
close(s.stop)
}
func (s *Service) client() pb2.GatewayServiceClient {
return pb2.NewGatewayServiceClient(s.conn)
}
func (s *Service) WriteMetricsV1Extension(ctx context.Context, extension map[string]string, points []*pb2.Point) (*pb2.WriteMetricsResponse, error) {
req := &pb2.WriteMetricsRequestV1{
Header: &commonpb.CommonRequestHeader{
Apikey: s.config.Apikey,
Header: extension,
},
Point: points,
}
return s.client().WriteMetricsV1(ctx, req)
}
func (s *Service) WriteMetricsV1Extension2(ctx context.Context, extension map[string]string, metrics []*model.Metric) (*pb2.WriteMetricsResponse, error) {
points := make([]*pb2.Point, len(metrics))
for i, metric := range metrics {
points[i] = &pb2.Point{
MetricName: metric.Name,
Timestamp: metric.Timestamp,
Tags: metric.Tags,
NumberValues: map[string]float64{
"value": metric.Value,
},
StringValues: nil,
}
}
req := &pb2.WriteMetricsRequestV1{
Header: &commonpb.CommonRequestHeader{
Apikey: s.config.Apikey,
Header: extension,
},
Point: points,
}
var callOpts []grpc.CallOption
if len(points) > compressThreshold {
callOpts = append(callOpts, grpc.UseCompressor(defaultCompression))
}
return s.client().WriteMetricsV1(ctx, req, callOpts...)
}
func (s *Service) WriteMetrics(ctx context.Context, results []*pb2.WriteMetricsRequestV4_TaskResult) (*pb2.WriteMetricsResponse, error) {
// TODO 修改tags
req := &pb2.WriteMetricsRequestV4{
Header: &commonpb.CommonRequestHeader{
Apikey: s.config.Apikey,
},
Results: results,
}
var callOpts []grpc.CallOption
callOpts = append(callOpts, grpc.UseCompressor(defaultCompression))
return s.client().WriteMetricsV4(ctx, req, callOpts...)
}
func (s *Service) Ping(ctx context.Context) error {
_, err := s.client().Ping(ctx, &emptypb.Empty{})
return err
}
func newConn(config Config) (*grpc.ClientConn, error) {
var opts []grpc.DialOption
opts = append(opts, grpc.WithConnectParams(grpc.ConnectParams{
Backoff: backoff.Config{
BaseDelay: 300 * time.Millisecond,
Multiplier: 1.6,
Jitter: 0.2,
MaxDelay: 10 * time.Second,
},
// 默认就是20 防止不小心覆盖了
MinConnectTimeout: 20 * time.Second,
}), grpc.WithKeepaliveParams(keepalive.ClientParameters{
// https://www.jianshu.com/p/97d465428a89
// grpc 其实会进行错误重连的 所以其实keepalive不是很有必要, TODO 验证一下这句话
// 1min没有包就ping一下
Time: 1 * time.Minute,
Timeout: 20 * time.Second,
PermitWithoutStream: false,
}), grpc.WithDefaultCallOptions(grpc.MaxCallSendMsgSize(64*1024*1024),
grpc.UseCompressor("gzip")), grpc.WithDefaultServiceConfig(`
{
"methodConfig": [
{
"name": [
{
"service": "io.holoinsight.server.gateway.grpc.GatewayService"
}
],
"retryPolicy": {
"maxAttempts": 3,
"initialBackoff": "0.3s",
"maxBackoff": "3s",
"backoffMultiplier": 2,
"retryableStatusCodes": [
"UNAVAILABLE"
]
}
}
]
}`))
if config.Secure {
var cred credentials.TransportCredentials = nil
var err error
if config.CaCert != "" {
cred, err = credentials.NewClientTLSFromFile(config.CaCert, config.ServerName)
} else {
var rootCas *x509.CertPool = nil
if config.CaCertBase64 != "" {
b, err := base64.StdEncoding.DecodeString(config.CaCertBase64)
if err != nil {
return nil, err
}
rootCas = x509.NewCertPool()
if !rootCas.AppendCertsFromPEM(b) {
return nil, fmt.Errorf("credentials: failed to append certificates")
}
}
cred, err = credentials.NewTLS(&tls.Config{ServerName: config.ServerName, RootCAs: rootCas}), nil
}
if err != nil {
return nil, err
}
opts = append(opts, grpc.WithTransportCredentials(cred))
} else {
opts = append(opts, grpc.WithTransportCredentials(insecure.NewCredentials()))
}
return grpc.DialContext(context.Background(), config.Addr, opts...)
}