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package dummyclient
import (
"context"
"fmt"
"net/http"
"github.com/containerd/log"
"github.com/docker/docker/libnetwork/diagnostic"
"github.com/docker/docker/libnetwork/networkdb"
events "github.com/docker/go-events"
)
type Mux interface {
HandleFunc(pattern string, handler func(http.ResponseWriter, *http.Request))
}
func RegisterDiagnosticHandlers(mux Mux, nDB *networkdb.NetworkDB) {
mux.HandleFunc("/watchtable", watchTable(nDB))
mux.HandleFunc("/watchedtableentries", watchTableEntries)
}
const (
missingParameter = "missing parameter"
)
type tableHandler struct {
cancelWatch func()
entries map[string]string
}
var clientWatchTable = map[string]tableHandler{}
func watchTable(nDB *networkdb.NetworkDB) func(w http.ResponseWriter, r *http.Request) {
return func(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
}
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(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
)
log.G(context.TODO()).Infof("Started watching table:%s", tableName)
for {
select {
case <-ch.Done():
log.G(context.TODO()).Infof("End watching %s", tableName)
return
case evt := <-ch.C:
log.G(context.TODO()).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.G(context.TODO()).Fatalf("Unexpected table event = %#v", event)
}
if isAdd {
// log.G(ctx).Infof("Add %s %s", tableName, eid)
clientWatchTable[tableName].entries[eid] = string(value)
} else {
// log.G(ctx).Infof("Del %s %s", tableName, eid)
delete(clientWatchTable[tableName].entries, eid)
}
}
}
}
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