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run.go
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run.go
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package main
import (
"context"
"encoding/binary"
"errors"
"fmt"
"math/rand"
"os"
"os/signal"
"syscall"
"time"
"github.com/google/uuid"
"github.com/stealthrocket/timecraft/internal/chaos"
"github.com/stealthrocket/timecraft/internal/print/human"
"github.com/stealthrocket/timecraft/internal/timecraft"
"github.com/stealthrocket/timecraft/internal/timemachine"
"github.com/stealthrocket/wasi-go"
)
const runUsage = `
Usage: timecraft run [options] [--] <module> [args...]
Options:
-C, --chaotic ratio Enable artificial fault injection when running the module (raio is a decimal value between 0 and 1)
-c, --config path Path to the timecraft configuration file (overrides TIMECRAFTCONFIG)
-D, --dial addr Expose a socket connected to the specified address
--dir dir Expose a directory to the guest module
-e, --env name=value Pass an environment variable to the guest module
-f, --function function Exported function to call in the guest module (_start if empty)
--fly-blind Disable recording of the guest module execution
-h, --help Show this usage information
-L, --listen addr Expose a socket listening on the specified address
--restrict Do not automatically expose the environment and root directory to the guest module
-S, --sockets extension Enable a sockets extension, one of none, auto, path_open, wasmedgev1, wasmedgev2 (default to auto)
--record-batch-size size Number of records written per batch (default to 4096)
--record-compression type Compression to use when writing records, either snappy or zstd (default to zstd)
-T, --trace Enable strace-like logging of host function calls
`
func run(ctx context.Context, args []string) error {
var (
envs stringList
listens stringList
dials stringList
dirs stringList
chaotic = human.Ratio(0)
batchSize = human.Count(4096)
compression = compression("zstd")
sockets = sockets("auto")
flyBlind = false
restrict = false
trace = false
)
flagSet := newFlagSet("timecraft run", runUsage)
customVar(flagSet, &envs, "e", "env")
customVar(flagSet, &listens, "L", "listen")
customVar(flagSet, &dials, "D", "dial")
customVar(flagSet, &dirs, "dir")
customVar(flagSet, &sockets, "S", "sockets")
customVar(flagSet, &chaotic, "C", "chaotic")
boolVar(flagSet, &trace, "T", "trace")
boolVar(flagSet, &flyBlind, "fly-blind")
boolVar(flagSet, &restrict, "restrict")
customVar(flagSet, &batchSize, "record-batch-size")
customVar(flagSet, &compression, "record-compression")
if err := flagSet.Parse(args); err != nil {
return err
}
args = flagSet.Args()
if len(args) == 0 {
return errors.New(`missing "--" separator before the module path`)
}
var wasmPath string
wasmPath, args = args[0], args[1:]
if !restrict {
envs = append(os.Environ(), envs...)
dirs = append([]string{"/"}, dirs...)
}
ctx, cancel := signal.NotifyContext(ctx, syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM)
defer cancel()
config, err := timecraft.LoadConfig()
if err != nil {
return err
}
registry, err := timecraft.CreateRegistry(config)
if err != nil {
return err
}
runtime, err := timecraft.NewRuntime(ctx, config)
if err != nil {
return err
}
defer runtime.Close(ctx)
scheduler := &timecraft.TaskScheduler{}
defer scheduler.Close()
serverFactory := &timecraft.ServerFactory{
Scheduler: scheduler,
}
var adapter func(timecraft.ProcessID, wasi.System) wasi.System
if chaotic > 0 {
adapter = func(process timecraft.ProcessID, system wasi.System) wasi.System {
seed := int64(binary.LittleEndian.Uint64(process[8:]))
prng := rand.NewSource(seed)
chance := float64(chaotic) / 2
system = chaos.New(prng, system,
chaos.Chance(chance, chaos.Error(system)),
chaos.Chance(chance, chaos.Chunk(system)),
)
system = chaos.LowEntropy(system)
system = chaos.ClockDrift(system)
return system
}
}
processManager := timecraft.NewProcessManager(ctx, registry, runtime, serverFactory, adapter)
defer processManager.Close()
serverFactory.ProcessManager = processManager
scheduler.ProcessManager = processManager
moduleSpec := timecraft.ModuleSpec{
Path: wasmPath,
Args: args,
Env: envs,
Dirs: dirs,
Dials: dials,
Listens: listens,
Sockets: string(sockets),
Stdin: os.Stdin,
Stdout: os.Stdout,
Stderr: os.Stderr,
// Allow the main module to open listening sockets on the host network
// so server applications can receive connections as if they were
// running outside of timecraft.
HostNetworkBinding: true,
}
if trace {
moduleSpec.Trace = os.Stderr
}
var logSpec *timecraft.LogSpec
if !flyBlind {
logSpec = &timecraft.LogSpec{
ProcessID: uuid.New(),
StartTime: time.Now(),
BatchSize: int(batchSize),
}
switch compression {
case "snappy":
logSpec.Compression = timemachine.Snappy
case "zstd":
logSpec.Compression = timemachine.Zstd
case "none", "":
logSpec.Compression = timemachine.Uncompressed
default:
return fmt.Errorf("invalid compression type %q", compression)
}
fmt.Fprintf(os.Stderr, "%s\n", logSpec.ProcessID)
}
processID, err := processManager.Start(moduleSpec, logSpec, nil)
if err != nil {
return err
}
return processManager.Wait(processID)
}