-
Notifications
You must be signed in to change notification settings - Fork 0
/
callout.go
129 lines (109 loc) · 3.27 KB
/
callout.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
// Copyright 2019 Istio Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package server
import (
"context"
"fmt"
"strings"
"google.golang.org/grpc"
"google.golang.org/grpc/metadata"
mcp "istio.io/api/mcp/v1alpha1"
"istio.io/istio/galley/pkg/authplugins"
"istio.io/istio/pkg/mcp/source"
)
type callout struct {
address string
so *source.Options
do []grpc.DialOption
cancel context.CancelFunc
pt calloutPatchTable
metadata []string
}
// Test override types
type dialFn func(string, ...grpc.DialOption) (*grpc.ClientConn, error)
type mcpClient interface {
Run(context.Context)
}
type newClientFn func(mcp.ResourceSinkClient, *source.Options) mcpClient
type closeFn func(*grpc.ClientConn)
type calloutPatchTable struct {
connClose closeFn
grpcDial dialFn
sourceNewClient newClientFn
}
func defaultCalloutPT() calloutPatchTable {
// non-test defaults
return calloutPatchTable{
grpcDial: grpc.Dial,
sourceNewClient: func(c mcp.ResourceSinkClient, o *source.Options) mcpClient { return source.NewClient(c, o) },
connClose: func(c *grpc.ClientConn) { c.Close() },
}
}
// newCallout initializes a callout struct. Address should be the
// "host:port" of the server to dial. Auth should be the name of an
// existing auth plugin under
// istio.io/istio/galley/pkg/authplugins. Metadata elements should be
// in the format of "key=value".
func newCallout(address, auth string, metadata []string,
so *source.Options) (*callout, error) {
return newCalloutPT(address, auth, metadata, so, defaultCalloutPT())
}
func newCalloutPT(address, auth string, metadata []string, so *source.Options,
pt calloutPatchTable) (*callout, error) {
auths := authplugins.AuthMap()
f, ok := auths[auth]
if !ok {
return nil, fmt.Errorf("auth plugin %v not found", auth)
}
opts, err := f(nil)
if err != nil {
return nil, err
}
m := make([]string, 0)
for _, v := range metadata {
kv := strings.Split(v, "=")
if len(kv) != 2 || kv[0] == "" || kv[1] == "" {
return nil, fmt.Errorf(
"sinkMeta not in key=value format: %v", v)
}
m = append(m, kv[0], kv[1])
}
return &callout{
address: address,
so: so,
do: opts,
pt: pt,
metadata: m,
}, nil
}
func (c *callout) Run() {
ctx, cancel := context.WithCancel(context.Background())
c.cancel = cancel
conn, err := c.pt.grpcDial(c.address, c.do...)
if err != nil {
scope.Errorf("Failed to connect to server: %v", err)
return
}
defer c.pt.connClose(conn)
client := mcp.NewResourceSinkClient(conn)
mcpClient := c.pt.sourceNewClient(client, c.so)
scope.Infof("Starting MCP Source Client connection to: %v", c.address)
ctx = metadata.AppendToOutgoingContext(ctx, c.metadata...)
mcpClient.Run(ctx)
}
func (c *callout) Close() {
if c.cancel != nil {
c.cancel()
}
}