-
Notifications
You must be signed in to change notification settings - Fork 10
/
server.go
145 lines (134 loc) · 3.55 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
package bifrost_rpc_access
import (
"context"
"errors"
"sync"
bifrost_rpc "github.com/aperturerobotics/bifrost/rpc"
"github.com/aperturerobotics/controllerbus/bus"
"github.com/aperturerobotics/controllerbus/directive"
"github.com/aperturerobotics/starpc/rpcstream"
srpc "github.com/aperturerobotics/starpc/srpc"
"github.com/aperturerobotics/util/broadcast"
)
// AccessRpcServiceServer is the server for AccessRpcService.
type AccessRpcServiceServer struct {
b bus.Bus
}
// NewAccessRpcServiceServer builds a AccessRpcService server with a bus.
func NewAccessRpcServiceServer(b bus.Bus) *AccessRpcServiceServer {
return &AccessRpcServiceServer{b: b}
}
// LookupRpcService looks up the rpc service via the bus.
func (s *AccessRpcServiceServer) LookupRpcService(
req *LookupRpcServiceRequest,
strm SRPCAccessRpcService_LookupRpcServiceStream,
) error {
dir := req.ToDirective()
var mtx sync.Mutex
var bcast broadcast.Broadcast
vals := make(map[uint32]struct{})
var sendQueue []*LookupRpcServiceResponse
var disposed bool
var resErr error
di, ref, err := s.b.AddDirective(dir, bus.NewCallbackHandler(
func(av directive.AttachedValue) {
mtx.Lock()
defer mtx.Unlock()
_, ok := av.GetValue().(bifrost_rpc.LookupRpcServiceValue)
if !ok {
return
}
vals[av.GetValueID()] = struct{}{}
if len(vals) == 1 {
sendQueue = append(sendQueue, &LookupRpcServiceResponse{
Exists: true,
})
bcast.Broadcast()
}
}, func(av directive.AttachedValue) {
mtx.Lock()
defer mtx.Unlock()
_, exists := vals[av.GetValueID()]
if !exists {
return
}
delete(vals, av.GetValueID())
if len(vals) == 0 {
sendQueue = append(sendQueue, &LookupRpcServiceResponse{
Removed: true,
})
bcast.Broadcast()
}
}, func() {
mtx.Lock()
disposed = true
bcast.Broadcast()
mtx.Unlock()
},
))
if err != nil {
return err
}
defer ref.Release()
defer di.AddIdleCallback(func(resErrs []error) {
mtx.Lock()
if resErr == nil {
for _, err := range resErrs {
if err != nil {
resErr = err
break
}
}
}
sendQueue = append(sendQueue, &LookupRpcServiceResponse{
Idle: true,
})
bcast.Broadcast()
mtx.Unlock()
})()
for {
select {
case <-strm.Context().Done():
return context.Canceled
case <-bcast.GetWaitCh():
}
mtx.Lock()
currSendQueue, currIsDisposed := sendQueue, disposed
sendQueue = nil
mtx.Unlock()
for _, msg := range currSendQueue {
if err := strm.Send(msg); err != nil {
return err
}
}
if currIsDisposed {
return errors.New("directive disposed")
}
}
}
// CallRpcService looks up the rpc service with the request & invokes the RPC.
func (s *AccessRpcServiceServer) CallRpcService(strm SRPCAccessRpcService_CallRpcServiceStream) error {
return rpcstream.HandleRpcStream(strm, func(ctx context.Context, componentID string) (srpc.Invoker, func(), error) {
// parse component id json
req := &LookupRpcServiceRequest{}
if err := req.UnmarshalComponentID(componentID); err != nil {
return nil, nil, err
}
if err := req.Validate(); err != nil {
return nil, nil, err
}
// lookup the rpc service invokers
invokers, invokerRef, err := bifrost_rpc.ExLookupRpcService(ctx, s.b, req.GetServiceId(), req.GetServerId())
if err != nil || invokerRef == nil {
return nil, nil, err
}
if len(invokers) == 0 {
invokerRef.Release()
return nil, nil, nil
}
// return the invoker slice
return srpc.InvokerSlice(invokers), invokerRef.Release, nil
})
}
// _ is a type assertion
var _ SRPCAccessRpcServiceServer = ((*AccessRpcServiceServer)(nil))