forked from yarpc/yarpc-go
-
Notifications
You must be signed in to change notification settings - Fork 0
/
register.go
119 lines (102 loc) · 3.61 KB
/
register.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
// Copyright (c) 2016 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package yarpc
import (
"context"
"sort"
"go.uber.org/yarpc/api/transport"
"go.uber.org/yarpc/internal/errors"
)
// MapRegistry is a Registry that maintains a map of the registered
// procedures.
type MapRegistry struct {
defaultService string
entries map[transport.ServiceProcedure]transport.HandlerSpec
}
// NewMapRegistry builds a new MapRegistry that uses the given name as the
// default service name.
func NewMapRegistry(defaultService string) MapRegistry {
return MapRegistry{
defaultService: defaultService,
entries: make(map[transport.ServiceProcedure]transport.HandlerSpec),
}
}
// Register registers the procedure with the MapRegistry.
func (m MapRegistry) Register(rs []transport.Registrant) {
for _, r := range rs {
if r.Service == "" {
r.Service = m.defaultService
}
if r.Procedure == "" {
panic("Expected procedure name not to be empty string in registration")
}
sp := transport.ServiceProcedure{
Service: r.Service,
Procedure: r.Procedure,
}
m.entries[sp] = r.HandlerSpec
}
}
// ServiceProcedures returns a list of services and their procedures that
// have been registered so far.
func (m MapRegistry) ServiceProcedures() []transport.ServiceProcedure {
procs := make([]transport.ServiceProcedure, 0, len(m.entries))
for k := range m.entries {
procs = append(procs, k)
}
sort.Sort(byServiceProcedure(procs))
return procs
}
// ChooseProcedure retrieves the HandlerSpec for the given Procedure or returns an
// error.
func (m MapRegistry) ChooseProcedure(service, procedure string) (transport.HandlerSpec, error) {
if service == "" {
service = m.defaultService
}
sp := transport.ServiceProcedure{
Service: service,
Procedure: procedure,
}
if spec, ok := m.entries[sp]; ok {
return spec, nil
}
return transport.HandlerSpec{}, errors.UnrecognizedProcedureError{
Service: service,
Procedure: procedure,
}
}
// Choose retrives the HandlerSpec for the service and procedure noted on the
// transport request, or returns an error.
func (m MapRegistry) Choose(ctx context.Context, req *transport.Request) (transport.HandlerSpec, error) {
return m.ChooseProcedure(req.Service, req.Procedure)
}
type byServiceProcedure []transport.ServiceProcedure
func (sp byServiceProcedure) Len() int {
return len(sp)
}
func (sp byServiceProcedure) Less(i int, j int) bool {
if sp[i].Service == sp[j].Service {
return sp[i].Procedure < sp[j].Procedure
}
return sp[i].Service < sp[j].Service
}
func (sp byServiceProcedure) Swap(i int, j int) {
sp[i], sp[j] = sp[j], sp[i]
}