/
server.go
223 lines (199 loc) · 5.46 KB
/
server.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
package server
import (
"context"
"time"
grpc_middleware "github.com/grpc-ecosystem/go-grpc-middleware"
grpc_auth "github.com/grpc-ecosystem/go-grpc-middleware/auth"
grpc_zap "github.com/grpc-ecosystem/go-grpc-middleware/logging/zap"
grpc_ctxtags "github.com/grpc-ecosystem/go-grpc-middleware/tags"
"go.opencensus.io/plugin/ocgrpc"
"go.opencensus.io/stats/view"
"go.opencensus.io/trace"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/peer"
"google.golang.org/grpc/status"
api "github.com/neepoo/proglog/api/v1"
)
const (
objectWildcard = "*"
produceAction = "produce"
consumeAction = "consume"
)
type CommitLog interface {
Append(*api.Record) (uint64, error)
Read(uint64) (*api.Record, error)
}
type Authorizer interface {
Authorize(subject, object, action string) error
}
type GetServerer interface {
GetServers() ([]*api.Server, error)
}
type Config struct {
CommitLog CommitLog
Authorizer Authorizer
GetServer GetServerer
}
func NewGRPCServer(config *Config, opts ...grpc.ServerOption) (*grpc.Server, error) {
logger := zap.L().Named("server")
// Then we add a “grpc.time_ns” field to our structured
// logs to log the duration of each request in nanoseconds.
zapOpts := []grpc_zap.Option{
grpc_zap.WithDurationField(
func(duration time.Duration) zapcore.Field {
return zap.Int64("grpc.time_ns",
duration.Nanoseconds(),
)
}),
}
// configure how OpenCensus collects metrics and traces:
trace.ApplyConfig(trace.Config{
DefaultSampler: trace.AlwaysSample(),
})
err := view.Register(ocgrpc.DefaultServerViews...)
if err != nil {
return nil, err
}
/*
These lines configure gRPC to apply the Zap interceptors that log the
gRPC calls and attach OpenCensus as the server’s stat handler so that
OpenCensus can record stats on the server’s request handling.
*/
opts = append(opts, grpc.StreamInterceptor(
grpc_middleware.ChainStreamServer(
grpc_ctxtags.StreamServerInterceptor(), // 设置请求标签
grpc_zap.StreamServerInterceptor(logger, zapOpts...),
grpc_auth.StreamServerInterceptor(authenticate),
)), grpc.UnaryInterceptor(grpc_middleware.ChainUnaryServer(
grpc_ctxtags.UnaryServerInterceptor(), // 设置请求标签
grpc_zap.UnaryServerInterceptor(logger, zapOpts...),
grpc_auth.UnaryServerInterceptor(authenticate),
)), grpc.StatsHandler(&ocgrpc.ServerHandler{}))
gsrv := grpc.NewServer(opts...)
srv, err := newgrpcServer(config)
if err != nil {
return nil, err
}
api.RegisterLogServer(gsrv, srv)
return gsrv, nil
}
type grpcServer struct {
api.UnimplementedLogServer
*Config
}
func newgrpcServer(config *Config) (srv *grpcServer, err error) {
srv = &grpcServer{
Config: config,
}
return srv, nil
}
type subjectContextKey struct{}
func subject(ctx context.Context) string {
return ctx.Value(subjectContextKey{}).(string)
}
// grpc 拦截器, 读取证书进行权限认证
func authenticate(ctx context.Context) (context.Context, error) {
pr, ok := peer.FromContext(ctx)
if !ok {
return ctx, status.New(
codes.Unknown,
"couldn't find peer info",
).Err()
}
if pr.AuthInfo == nil {
return context.WithValue(ctx, subjectContextKey{}, ""), nil
}
tlsInfo := pr.AuthInfo.(credentials.TLSInfo)
// todo look on tlsInfo
sj := tlsInfo.State.VerifiedChains[0][0].Subject.CommonName
ctx = context.WithValue(ctx, subjectContextKey{}, sj)
return ctx, nil
}
func (s grpcServer) Produce(ctx context.Context, req *api.ProduceRequest) (
*api.ProduceResponse, error) {
// 先进行权限认证
if err := s.Authorizer.Authorize(
subject(ctx),
objectWildcard,
produceAction,
); err != nil {
return nil, err
}
offset, err := s.CommitLog.Append(req.Record)
if err != nil {
return nil, err
}
return &api.ProduceResponse{Offset: offset}, nil
}
func (s *grpcServer) Consume(ctx context.Context, req *api.ConsumeRequest) (*api.ConsumeResponse, error) {
if err := s.Authorizer.Authorize(
subject(ctx),
objectWildcard,
consumeAction,
); err != nil {
return nil, err
}
record, err := s.CommitLog.Read(req.Offset)
if err != nil {
return nil, err
}
return &api.ConsumeResponse{Record: record}, nil
}
// ProduceStream 双向流
func (s *grpcServer) ProduceStream(stream api.Log_ProduceStreamServer) error {
for {
req, err := stream.Recv()
// todo should check io.EOF
if err != nil {
return err
}
res, err := s.Produce(stream.Context(), req)
if err != nil {
return err
}
if err = stream.Send(res); err != nil {
return err
}
}
}
// ConsumeStream 服务端流,从一个制定的偏移量持续消费数据
func (s *grpcServer) ConsumeStream(
req *api.ConsumeRequest,
stream api.Log_ConsumeStreamServer,
) error {
for {
select {
case <-stream.Context().Done():
return nil
default:
res, err := s.Consume(stream.Context(), req)
switch err.(type) {
case nil:
// When the server reaches the end of the log, the server will wait until someone
// appends a record to the log and then continue streaming records to the
// client.
case api.ErrOffsetOutOfRange:
continue
default:
return err
}
if err = stream.Send(res); err != nil {
return err
}
req.Offset++
}
}
}
func (s *grpcServer) GetServers(ctx context.Context, req *api.GetServersRequest) (*api.GetServersResponse, error) {
servers, err := s.GetServer.GetServers()
if err != nil {
return nil, err
}
return &api.GetServersResponse{
Servers: servers,
}, nil
}