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
|
package dummyclient
import (
"fmt"
"log"
"net/http"
"github.com/docker/docker/libnetwork/diagnostic"
"github.com/docker/docker/libnetwork/networkdb"
events "github.com/docker/go-events"
"github.com/sirupsen/logrus"
)
// DummyClientPaths2Func exported paths for the client
var DummyClientPaths2Func = map[string]diagnostic.HTTPHandlerFunc{
"/watchtable": watchTable,
"/watchedtableentries": watchTableEntries,
}
const (
missingParameter = "missing parameter"
)
type tableHandler struct {
cancelWatch func()
entries map[string]string
}
var clientWatchTable = map[string]tableHandler{}
func watchTable(ctx interface{}, w http.ResponseWriter, r *http.Request) {
r.ParseForm() //nolint:errcheck
diagnostic.DebugHTTPForm(r)
if len(r.Form["tname"]) < 1 {
rsp := diagnostic.WrongCommand(missingParameter, fmt.Sprintf("%s?tname=table_name", r.URL.Path))
diagnostic.HTTPReply(w, rsp, &diagnostic.JSONOutput{}) //nolint:errcheck
return
}
tableName := r.Form["tname"][0]
if _, ok := clientWatchTable[tableName]; ok {
fmt.Fprintf(w, "OK\n")
return
}
nDB, ok := ctx.(*networkdb.NetworkDB)
if ok {
ch, cancel := nDB.Watch(tableName, "", "")
clientWatchTable[tableName] = tableHandler{cancelWatch: cancel, entries: make(map[string]string)}
go handleTableEvents(tableName, ch)
fmt.Fprintf(w, "OK\n")
}
}
func watchTableEntries(ctx interface{}, w http.ResponseWriter, r *http.Request) {
r.ParseForm() //nolint:errcheck
diagnostic.DebugHTTPForm(r)
if len(r.Form["tname"]) < 1 {
rsp := diagnostic.WrongCommand(missingParameter, fmt.Sprintf("%s?tname=table_name", r.URL.Path))
diagnostic.HTTPReply(w, rsp, &diagnostic.JSONOutput{}) //nolint:errcheck
return
}
tableName := r.Form["tname"][0]
table, ok := clientWatchTable[tableName]
if !ok {
fmt.Fprintf(w, "Table %s not watched\n", tableName)
return
}
fmt.Fprintf(w, "total elements: %d\n", len(table.entries))
i := 0
for k, v := range table.entries {
fmt.Fprintf(w, "%d) k:`%s` -> v:`%s`\n", i, k, v)
i++
}
}
func handleTableEvents(tableName string, ch *events.Channel) {
var (
// nid string
eid string
value []byte
isAdd bool
)
logrus.Infof("Started watching table:%s", tableName)
for {
select {
case <-ch.Done():
logrus.Infof("End watching %s", tableName)
return
case evt := <-ch.C:
logrus.Infof("Recevied new event on:%s", tableName)
switch event := evt.(type) {
case networkdb.CreateEvent:
// nid = event.NetworkID
eid = event.Key
value = event.Value
isAdd = true
case networkdb.DeleteEvent:
// nid = event.NetworkID
eid = event.Key
value = event.Value
isAdd = false
default:
log.Fatalf("Unexpected table event = %#v", event)
}
if isAdd {
// logrus.Infof("Add %s %s", tableName, eid)
clientWatchTable[tableName].entries[eid] = string(value)
} else {
// logrus.Infof("Del %s %s", tableName, eid)
delete(clientWatchTable[tableName].entries, eid)
}
}
}
}
|
