166 lines
3.6 KiB
Go
166 lines
3.6 KiB
Go
package main
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import (
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"bytes"
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"context"
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"encoding/json"
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"flag"
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"fmt"
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"io"
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"io/ioutil"
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"log"
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"os"
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"os/signal"
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"sync"
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"syscall"
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"time"
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shell "github.com/ipfs/go-ipfs-api"
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"github.com/perlin-network/life/compiler"
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"github.com/perlin-network/life/exec"
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"github.com/rogpeppe/go-internal/txtar"
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"tulpa.dev/within/wasmcloud/cmd/internal"
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"within.website/olin/abi/cwa"
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)
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var (
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ipfsURL = flag.String("ipfs-host", "localhost:5001", "IPFS host (must have pubsub experiment enabled)")
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workerCount = flag.Int("worker-count", 1, "number of wasm executor workers")
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)
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func main() {
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log.SetFlags(log.LstdFlags | log.Lshortfile)
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sh := shell.NewShell(*ipfsURL)
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subsc, err := sh.PubSubSubscribe(internal.TopicName)
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if err != nil {
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log.Fatal(err)
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}
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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c := make(chan os.Signal, 2)
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signal.Notify(c, os.Interrupt, syscall.SIGTERM)
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go func() {
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<-c
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cancel()
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}()
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var wg sync.WaitGroup
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wg.Add(*workerCount)
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for range make([]struct{}, *workerCount) {
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go waitForNewWASM(ctx, &wg, sh, subsc)
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}
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log.Printf("waiting for work on %s", internal.TopicName)
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wg.Wait()
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}
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func waitForNewWASM(ctx context.Context, wg *sync.WaitGroup, sh *shell.Shell, subsc *shell.PubSubSubscription) {
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defer wg.Done()
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for {
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select {
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case <-ctx.Done():
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return
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default:
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}
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msg, err := subsc.Next()
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if err != nil {
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log.Printf("error getting message: %v", err)
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return
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}
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data := msg.Data
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var er internal.ExecRequest
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err = json.Unmarshal(data, &er)
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if err != nil {
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log.Printf("invalid message %s: %v", string(data), err)
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continue
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}
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stdin := bytes.NewBuffer(er.Data)
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stdout := bytes.NewBuffer(nil)
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logBuf := bytes.NewBuffer(nil)
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bin, err := sh.Cat(er.WASMCID)
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if err != nil {
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log.Printf("can't get wasm: %v", err)
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continue
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}
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wasmBin, err := ioutil.ReadAll(bin)
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bin.Close()
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if err != nil {
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log.Printf("can't get wasm binary %s: %v", er.WASMCID, err)
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continue
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}
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p := cwa.NewProcess(er.WASMCID, nil, er.Env)
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p.Stdin = stdin
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p.Stdout = stdout
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p.Stderr = stdout
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p.Logger = log.New(io.MultiWriter(logBuf, os.Stdout), er.WASMCID+" ", log.LstdFlags)
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gp := &compiler.SimpleGasPolicy{GasPerInstruction: 1}
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vm, err := exec.NewVirtualMachine(wasmBin, exec.VMConfig{}, p, gp)
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if err != nil {
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p.Logger.Printf("[SYSTEM] can't create VM: %v", err)
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continue
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}
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main, ok := vm.GetFunctionExport("cwa_main")
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if !ok {
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p.Logger.Printf("[SYSTEM] can't get main function")
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continue
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}
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begin := time.Now()
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ret, err := vm.Run(main)
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if err != nil {
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p.Logger.Printf("error running main: %v", err)
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continue
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}
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dur := time.Since(begin)
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p.Logger.Printf("[SYSTEM] return status: %v", ret)
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arc := txtar.Archive{
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Comment: []byte(fmt.Sprintf("%s: execution of %s at %s", er.UUID, er.WASMCID, begin.Format(time.RFC3339))),
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Files: []txtar.File{
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{
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Name: "vmstats.txt",
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Data: []byte(fmt.Sprintf("execution time: %s\ngas used: %v\nsyscall count: %v", dur, vm.Gas, p.SyscallCount())),
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},
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{
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Name: "stdout.txt",
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Data: stdout.Bytes(),
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},
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{
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Name: "logs.txt",
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Data: logBuf.Bytes(),
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},
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},
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}
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interm := bytes.NewBuffer(txtar.Format(&arc))
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cid, err := sh.Add(interm)
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if err != nil {
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log.Printf("can't save execution results: %v", err)
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continue
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}
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log.Printf("wasm module %s execution finished, logs at %s", er.WASMCID, cid)
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resp := internal.ExecResponse{
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WASMCID: er.WASMCID,
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LogBundleCID: cid,
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Logs: arc,
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UUID: er.UUID,
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}
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repMsg, _ := json.Marshal(resp)
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sh.PubSubPublish(er.UUID, string(repMsg))
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}
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}
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