mirror of https://github.com/tidwall/tile38.git
76 lines
2.2 KiB
Go
76 lines
2.2 KiB
Go
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// Copyright 2018 The NATS Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package server
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// We wrap to hold onto optional items for /connz.
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type closedClient struct {
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ConnInfo
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subs []string
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user string
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}
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// Fixed sized ringbuffer for closed connections.
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type closedRingBuffer struct {
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total uint64
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conns []*closedClient
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}
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// Create a new ring buffer with at most max items.
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func newClosedRingBuffer(max int) *closedRingBuffer {
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rb := &closedRingBuffer{}
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rb.conns = make([]*closedClient, max)
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return rb
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}
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// Adds in a new closed connection. If there is no more room,
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// remove the oldest.
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func (rb *closedRingBuffer) append(cc *closedClient) {
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rb.conns[rb.next()] = cc
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rb.total++
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}
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func (rb *closedRingBuffer) next() int {
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return int(rb.total % uint64(cap(rb.conns)))
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}
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func (rb *closedRingBuffer) len() int {
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if rb.total > uint64(cap(rb.conns)) {
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return cap(rb.conns)
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}
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return int(rb.total)
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}
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func (rb *closedRingBuffer) totalConns() uint64 {
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return rb.total
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}
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// This will not be sorted. Will return a copy of the list
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// which recipient can modify. If the contents of the client
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// itself need to be modified, meaning swapping in any optional items,
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// a copy should be made. We could introduce a new lock and hold that
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// but since we return this list inside monitor which allows programatic
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// access, we do not know when it would be done.
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func (rb *closedRingBuffer) closedClients() []*closedClient {
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dup := make([]*closedClient, rb.len())
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if rb.total <= uint64(cap(rb.conns)) {
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copy(dup, rb.conns[:rb.len()])
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} else {
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first := rb.next()
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next := cap(rb.conns) - first
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copy(dup, rb.conns[first:])
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copy(dup[next:], rb.conns[:next])
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}
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return dup
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}
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