mirror of
https://github.com/cgrates/cgrates.git
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122 lines
3.1 KiB
Go
122 lines
3.1 KiB
Go
/*
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Real-time Online/Offline Charging System (OCS) for Telecom & ISP environments
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Copyright (C) ITsysCOM GmbH
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>
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*/
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package utils
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import (
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"net"
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"net/rpc"
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"net/rpc/jsonrpc"
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)
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// ConcReqs the structure that allocs requests for API
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type ConcReqs struct {
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strategy string
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aReqs chan struct{}
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}
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// NewConReqs creates a new ConcReqs
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func NewConReqs(reqs int, strategy string) *ConcReqs {
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cR := &ConcReqs{
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strategy: strategy,
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aReqs: make(chan struct{}, reqs),
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}
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return cR
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}
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// IsLimited returns true if the limit is not 0
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func (cR *ConcReqs) IsLimited() bool {
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return cap(cR.aReqs) != 0
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}
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// Allocated returns the number of requests actively serviced
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func (cR *ConcReqs) Allocated() int {
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return len(cR.aReqs)
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}
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// Allocate will reserve a channel for the API call
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func (cR *ConcReqs) Allocate() (err error) {
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switch cR.strategy {
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case MetaBusy:
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if len(cR.aReqs) == cap(cR.aReqs) {
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return ErrMaxConcurentRPCExceededNoCaps
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}
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fallthrough
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case MetaQueue:
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cR.aReqs <- struct{}{}
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}
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return
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}
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// Deallocate will free a channel for the API call
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func (cR *ConcReqs) Deallocate() {
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<-cR.aReqs
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return
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}
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type conn interface {
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Read(b []byte) (n int, err error)
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Write(b []byte) (n int, err error)
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Close() error
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LocalAddr() net.Addr
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RemoteAddr() net.Addr
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}
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func newConcReqsGOBCodec(conn conn, conReqs *ConcReqs, anz anzWrapFunc) rpc.ServerCodec {
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return anz(newConcReqsServerCodec(newGobServerCodec(conn), conReqs), MetaGOB, conn.RemoteAddr(), conn.LocalAddr())
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}
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func newConcReqsJSONCodec(conn conn, conReqs *ConcReqs, anz anzWrapFunc) rpc.ServerCodec {
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return anz(newConcReqsServerCodec(jsonrpc.NewServerCodec(conn), conReqs), MetaJSON, conn.RemoteAddr(), conn.LocalAddr())
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}
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func newConcReqsServerCodec(sc rpc.ServerCodec, conReqs *ConcReqs) rpc.ServerCodec {
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if !conReqs.IsLimited() {
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return sc
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}
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return &concReqsServerCodec{
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sc: sc,
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conReqs: conReqs,
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}
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}
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type concReqsServerCodec struct {
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sc rpc.ServerCodec
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conReqs *ConcReqs
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}
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func (c *concReqsServerCodec) ReadRequestHeader(r *rpc.Request) error {
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return c.sc.ReadRequestHeader(r)
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}
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func (c *concReqsServerCodec) ReadRequestBody(x interface{}) error {
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if err := c.conReqs.Allocate(); err != nil {
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return err
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}
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return c.sc.ReadRequestBody(x)
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}
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func (c *concReqsServerCodec) WriteResponse(r *rpc.Response, x interface{}) error {
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if r.Error == ErrMaxConcurentRPCExceededNoCaps.Error() {
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r.Error = ErrMaxConcurentRPCExceeded.Error()
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} else {
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defer c.conReqs.Deallocate()
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}
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return c.sc.WriteResponse(r, x)
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}
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func (c *concReqsServerCodec) Close() error { return c.sc.Close() }
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