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journal.go
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journal.go
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// Copyright 2018 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 sink
import (
"sync"
"time"
"github.com/gogo/googleapis/google/rpc"
mcp "istio.io/api/mcp/v1alpha1"
)
// JournaledRequest is a common structure for journaling
// both mcp.MeshConfigRequest and mcp.RequestResources. It can be replaced with
// mcp.RequestResources once we fully switch over to the new API.
type JournaledRequest struct {
VersionInfo string
Collection string
ResponseNonce string
ErrorDetail *rpc.Status
SinkNode *mcp.SinkNode
}
func (jr *JournaledRequest) ToMeshConfigRequest() *mcp.MeshConfigRequest {
return &mcp.MeshConfigRequest{
TypeUrl: jr.Collection,
VersionInfo: jr.VersionInfo,
ResponseNonce: jr.ResponseNonce,
ErrorDetail: jr.ErrorDetail,
SinkNode: jr.SinkNode,
}
}
// RecentRequestInfo is metadata about a request that the client has sent.
type RecentRequestInfo struct {
Time time.Time
Request *JournaledRequest
}
// Acked indicates whether the message was an ack or not.
func (r RecentRequestInfo) Acked() bool {
return r.Request.ErrorDetail == nil
}
const journalDepth = 32
// RecentRequestsJournal captures debug metadata about the latest requests that was sent by this client.
type RecentRequestsJournal struct {
itemsMutex sync.Mutex
items []RecentRequestInfo
next int
size int
}
func NewRequestJournal() *RecentRequestsJournal {
return &RecentRequestsJournal{
items: make([]RecentRequestInfo, journalDepth),
}
}
func (r *RecentRequestsJournal) RecordMeshConfigRequest(req *mcp.MeshConfigRequest) { // nolint:interfacer
r.itemsMutex.Lock()
defer r.itemsMutex.Unlock()
item := RecentRequestInfo{
Time: time.Now(),
Request: &JournaledRequest{
VersionInfo: req.VersionInfo,
Collection: req.TypeUrl,
ResponseNonce: req.ResponseNonce,
ErrorDetail: req.ErrorDetail,
SinkNode: req.SinkNode,
},
}
r.items[r.next] = item
r.next++
if r.next == cap(r.items) {
r.next = 0
}
if r.size < cap(r.items) {
r.size++
}
}
func (r *RecentRequestsJournal) RecordRequestResources(req *mcp.RequestResources) { // nolint:interfacer
item := RecentRequestInfo{
Time: time.Now(),
Request: &JournaledRequest{
Collection: req.Collection,
ResponseNonce: req.ResponseNonce,
ErrorDetail: req.ErrorDetail,
SinkNode: req.SinkNode,
},
}
r.itemsMutex.Lock()
defer r.itemsMutex.Unlock()
r.items[r.next] = item
r.next++
if r.next == cap(r.items) {
r.next = 0
}
if r.size < cap(r.items) {
r.size++
}
}
func (r *RecentRequestsJournal) Snapshot() []RecentRequestInfo {
r.itemsMutex.Lock()
defer r.itemsMutex.Unlock()
var result []RecentRequestInfo
if r.size < cap(r.items) {
result = make([]RecentRequestInfo, r.next)
copy(result, r.items[0:r.next])
} else {
result = make([]RecentRequestInfo, len(r.items))
copy(result, r.items[r.next:])
copy(result[cap(r.items)-r.next:], r.items[0:r.next])
}
return result
}