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133 lines
3.0 KiB
133 lines
3.0 KiB
//
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// Copyright (c) 2019 Ted Unangst <tedu@tedunangst.com>
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//
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// Permission to use, copy, modify, and distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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package main
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import (
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"bytes"
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"net"
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"net/rpc"
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"os"
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"os/exec"
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"humungus.tedunangst.com/r/webs/gate"
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"humungus.tedunangst.com/r/webs/image"
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)
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type Shrinker struct {
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}
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type ShrinkerArgs struct {
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Buf []byte
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Params image.Params
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}
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type ShrinkerResult struct {
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Image *image.Image
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}
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var shrinkgate = gate.NewLimiter(4)
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func (s *Shrinker) Shrink(args *ShrinkerArgs, res *ShrinkerResult) error {
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shrinkgate.Start()
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defer shrinkgate.Finish()
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img, err := image.Vacuum(bytes.NewReader(args.Buf), args.Params)
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if err != nil {
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return err
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}
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res.Image = img
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return nil
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}
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func backendSockname() string {
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return dataDir + "/backend.sock"
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}
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func shrinkit(data []byte) (*image.Image, error) {
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cl, err := rpc.Dial("unix", backendSockname())
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if err != nil {
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return nil, err
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}
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defer cl.Close()
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var res ShrinkerResult
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err = cl.Call("Shrinker.Shrink", &ShrinkerArgs{
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Buf: data,
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Params: image.Params{LimitSize: 4200 * 4200, MaxWidth: 2048, MaxHeight: 2048},
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}, &res)
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if err != nil {
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return nil, err
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}
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return res.Image, nil
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}
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var backendhooks []func()
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func orphancheck() {
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var b [1]byte
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os.Stdin.Read(b[:])
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dlog.Printf("backend shutting down")
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os.Exit(0)
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}
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func backendServer() {
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dlog.Printf("backend server running")
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go orphancheck()
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shrinker := new(Shrinker)
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srv := rpc.NewServer()
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err := srv.Register(shrinker)
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if err != nil {
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elog.Panicf("unable to register shrinker: %s", err)
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}
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sockname := backendSockname()
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err = os.Remove(sockname)
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if err != nil && !os.IsNotExist(err) {
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elog.Panicf("unable to unlink socket: %s", err)
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}
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lis, err := net.Listen("unix", sockname)
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if err != nil {
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elog.Panicf("unable to register shrinker: %s", err)
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}
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err = setLimits()
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if err != nil {
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elog.Printf("error setting backend limits: %s", err)
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}
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for _, h := range backendhooks {
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h()
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}
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srv.Accept(lis)
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}
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func runBackendServer() {
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r, w, err := os.Pipe()
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if err != nil {
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elog.Panicf("can't pipe: %s", err)
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}
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proc := exec.Command(os.Args[0], reexecArgs("backend")...)
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proc.Stdout = os.Stdout
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proc.Stderr = os.Stderr
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proc.Stdin = r
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err = proc.Start()
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if err != nil {
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elog.Panicf("can't exec backend: %s", err)
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}
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go func() {
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proc.Wait()
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elog.Printf("lost the backend: %s", err)
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w.Close()
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}()
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}
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