mirror of
https://github.com/TecharoHQ/anubis.git
synced 2026-04-10 10:38:45 +00:00
305 lines
7.9 KiB
Go
305 lines
7.9 KiB
Go
package wasm
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import (
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"context"
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"errors"
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"fmt"
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"io"
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"math"
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"os"
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"strconv"
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"sync"
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"time"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/promauto"
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"github.com/tetratelabs/wazero"
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"github.com/tetratelabs/wazero/api"
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)
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func UpdateNonce(uint32) {}
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var (
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validationTime = promauto.NewHistogramVec(prometheus.HistogramOpts{
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Name: "anubis_wasm_validation_time",
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Help: "The time taken for the validation function to run per checker (nanoseconds)",
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Buckets: prometheus.ExponentialBucketsRange(1, math.Pow(2, 31), 32),
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}, []string{"fname"})
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validationCount = promauto.NewCounterVec(prometheus.CounterOpts{
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Name: "anubis_wasm_validation",
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Help: "The number of times the validation logic has been run and its success rate",
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}, []string{"fname", "success"})
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)
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type Runner struct {
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r wazero.Runtime
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code wazero.CompiledModule
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fname string
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lock sync.Mutex
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}
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func NewRunner(ctx context.Context, fname string, fin io.ReadCloser) (*Runner, error) {
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data, err := io.ReadAll(fin)
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if err != nil {
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return nil, fmt.Errorf("wasm: can't read from fin: %w", err)
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}
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r := wazero.NewRuntime(ctx)
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_, err = r.NewHostModuleBuilder("anubis").
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NewFunctionBuilder().
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WithFunc(func(context.Context, uint32) {}).
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Export("anubis_update_nonce").
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Instantiate(ctx)
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if err != nil {
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return nil, fmt.Errorf("wasm: can't export anubis_update_nonce: %w", err)
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}
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code, err := r.CompileModule(ctx, data)
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if err != nil {
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return nil, fmt.Errorf("wasm: can't compile module: %w", err)
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}
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result := &Runner{
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r: r,
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code: code,
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fname: fname,
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}
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return result, nil
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}
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func (r *Runner) checkExports(module api.Module) error {
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funcs := []string{
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"anubis_work",
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"anubis_validate",
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"data_ptr",
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"set_data_length",
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"result_hash_ptr",
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"result_hash_size",
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"verification_hash_ptr",
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"verification_hash_size",
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}
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var errs []error
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for _, fun := range funcs {
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if module.ExportedFunction(fun) == nil {
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errs = append(errs, fmt.Errorf("function %s is not defined", fun))
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}
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}
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if len(errs) != 0 {
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return errors.Join(errs...)
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}
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return nil
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}
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func (r *Runner) anubisWork(ctx context.Context, module api.Module, difficulty, initialNonce, iterand uint32) (uint32, error) {
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results, err := module.ExportedFunction("anubis_work").Call(ctx, uint64(difficulty), uint64(initialNonce), uint64(iterand))
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if err != nil {
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return 0, err
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}
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return uint32(results[0]), nil
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}
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func (r *Runner) anubisValidate(ctx context.Context, module api.Module, nonce, difficulty uint32) (bool, error) {
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results, err := module.ExportedFunction("anubis_validate").Call(ctx, uint64(nonce), uint64(difficulty))
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if err != nil {
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return false, err
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}
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// Rust booleans are 1 if true
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return results[0] == 1, nil
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}
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func (r *Runner) dataPtr(ctx context.Context, module api.Module) (uint32, error) {
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results, err := module.ExportedFunction("data_ptr").Call(ctx)
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if err != nil {
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return 0, err
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}
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return uint32(results[0]), nil
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}
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func (r *Runner) setDataLength(ctx context.Context, module api.Module, length uint32) error {
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_, err := module.ExportedFunction("set_data_length").Call(ctx, uint64(length))
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return err
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}
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func (r *Runner) resultHashPtr(ctx context.Context, module api.Module) (uint32, error) {
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results, err := module.ExportedFunction("result_hash_ptr").Call(ctx)
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if err != nil {
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return 0, err
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}
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return uint32(results[0]), nil
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}
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func (r *Runner) resultHashSize(ctx context.Context, module api.Module) (uint32, error) {
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results, err := module.ExportedFunction("result_hash_size").Call(ctx)
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if err != nil {
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return 0, err
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}
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return uint32(results[0]), nil
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}
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func (r *Runner) verificationHashPtr(ctx context.Context, module api.Module) (uint32, error) {
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results, err := module.ExportedFunction("verification_hash_ptr").Call(ctx)
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if err != nil {
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return 0, err
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}
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return uint32(results[0]), nil
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}
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func (r *Runner) verificationHashSize(ctx context.Context, module api.Module) (uint32, error) {
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results, err := module.ExportedFunction("verification_hash_size").Call(ctx)
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if err != nil {
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return 0, err
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}
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return uint32(results[0]), nil
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}
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func (r *Runner) writeData(ctx context.Context, module api.Module, data []byte) error {
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if len(data) > 4096 {
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return os.ErrInvalid
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}
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length := uint32(len(data))
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dataPtr, err := r.dataPtr(ctx, module)
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if err != nil {
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return fmt.Errorf("can't read data pointer: %w", err)
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}
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if !module.Memory().Write(dataPtr, data) {
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return fmt.Errorf("[unexpected] can't write memory, is data out of range??")
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}
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if err := r.setDataLength(ctx, module, length); err != nil {
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return fmt.Errorf("can't set data length: %w", err)
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}
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return nil
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}
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func (r *Runner) readResult(ctx context.Context, module api.Module) ([]byte, error) {
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length, err := r.resultHashSize(ctx, module)
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if err != nil {
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return nil, fmt.Errorf("can't get result hash size: %w", err)
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}
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ptr, err := r.resultHashPtr(ctx, module)
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if err != nil {
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return nil, fmt.Errorf("can't get result hash pointer: %w", err)
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}
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buf, ok := module.Memory().Read(ptr, length)
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if !ok {
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return nil, fmt.Errorf("[unexpected] can't read from memory, is something out of range??")
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}
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return buf, nil
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}
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func (r *Runner) run(ctx context.Context, data []byte, difficulty, initialNonce, iterand uint32) (uint32, []byte, api.Module, error) {
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mod, err := r.r.InstantiateModule(ctx, r.code, wazero.NewModuleConfig().WithName(r.fname))
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if err != nil {
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return 0, nil, nil, fmt.Errorf("can't instantiate module: %w", err)
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}
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if err := r.checkExports(mod); err != nil {
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return 0, nil, nil, err
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}
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if err := r.writeData(ctx, mod, data); err != nil {
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return 0, nil, nil, err
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}
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nonce, err := r.anubisWork(ctx, mod, difficulty, initialNonce, iterand)
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if err != nil {
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return 0, nil, nil, fmt.Errorf("can't run work function: %w", err)
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}
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hash, err := r.readResult(ctx, mod)
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if err != nil {
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return 0, nil, nil, fmt.Errorf("can't read result: %w", err)
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}
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return nonce, hash, mod, nil
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}
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func (r *Runner) Run(ctx context.Context, data []byte, difficulty, initialNonce, iterand uint32) (uint32, []byte, error) {
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nonce, hash, _, err := r.run(ctx, data, difficulty, initialNonce, iterand)
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if err != nil {
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return 0, nil, fmt.Errorf("can't run %s: %w", r.fname, err)
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}
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return nonce, hash, nil
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}
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func (r *Runner) verify(ctx context.Context, data, verify []byte, nonce, difficulty uint32) (bool, api.Module, error) {
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mod, err := r.r.InstantiateModule(ctx, r.code, wazero.NewModuleConfig().WithName(r.fname))
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if err != nil {
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return false, nil, fmt.Errorf("can't instantiate module: %w", err)
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}
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if err := r.checkExports(mod); err != nil {
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return false, nil, err
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}
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if err := r.writeData(ctx, mod, data); err != nil {
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return false, nil, err
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}
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if err := r.writeVerification(ctx, mod, verify); err != nil {
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return false, nil, err
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}
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ok, err := r.anubisValidate(ctx, mod, nonce, difficulty)
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if err != nil {
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return false, nil, fmt.Errorf("can't validate hash %x from challenge %x, nonce %d and difficulty %d: %w", verify, data, nonce, difficulty, err)
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}
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return ok, mod, nil
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}
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func (r *Runner) Verify(ctx context.Context, data, verify []byte, nonce, difficulty uint32) (bool, error) {
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r.lock.Lock()
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defer r.lock.Unlock()
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t0 := time.Now()
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ok, _, err := r.verify(ctx, data, verify, nonce, difficulty)
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validationTime.WithLabelValues(r.fname).Observe(float64(time.Since(t0)))
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validationCount.WithLabelValues(r.fname, strconv.FormatBool(ok))
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return ok, err
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}
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func (r *Runner) writeVerification(ctx context.Context, module api.Module, data []byte) error {
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length, err := r.verificationHashSize(ctx, module)
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if err != nil {
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return fmt.Errorf("can't get verification hash size: %v", err)
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}
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if length != uint32(len(data)) {
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return fmt.Errorf("data is too big, want %d bytes, got: %d", length, len(data))
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}
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ptr, err := r.verificationHashPtr(ctx, module)
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if err != nil {
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return fmt.Errorf("can't get verification hash pointer: %v", err)
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}
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if !module.Memory().Write(ptr, data) {
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return fmt.Errorf("[unexpected] can't write memory, is data out of range??")
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}
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return nil
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}
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