feat: add libcmt and gollup

pkg/gollup/gollup.go

@@ -0,0 +1,91 @@
+// (c) Cartesi and individual authors (see AUTHORS)
+// SPDX-License-Identifier: Apache-2.0 (see LICENSE)
+
+package gollup
+
+import "github.com/cartesi/rollups-node/pkg/libcmt"
+
+type OutputEmitter interface {
+	SendVoucher(address libcmt.Address, value []byte, data []byte) (uint64, error)
+	SendNotice(data []byte) (uint64, error)
+	SendReport(data []byte) error
+	RaiseException(data []byte) error
+}
+
+type ReportEmitter interface {
+	SendReport(data []byte) error
+	RaiseException(data []byte) error
+}
+
+// ------------------------------------------------------------------------------------------------
+
+type AdvanceHandler func(OutputEmitter, libcmt.Input) (accept bool)
+
+type InspectHandler func(ReportEmitter, libcmt.Query) (accept bool)
+
+type Gollup struct {
+	rollup         *libcmt.Rollup
+	advanceHandler AdvanceHandler
+	inspectHandler InspectHandler
+}
+
+func New(advanceHandler AdvanceHandler, inspectHandler InspectHandler) (*Gollup, error) {
+	rollup, err := libcmt.NewRollup()
+	if err != nil {
+		return nil, err
+	}
+	return &Gollup{rollup, advanceHandler, inspectHandler}, nil
+}
+
+func (gollup *Gollup) Close() {
+	gollup.rollup.Close()
+}
+
+func (gollup *Gollup) Run() error {
+	accept := true
+	for {
+		requestType, err := gollup.rollup.Finish(accept)
+		if err != nil {
+			return err
+		}
+
+		switch requestType {
+		case libcmt.AdvanceState:
+			input, err := gollup.rollup.ReadAdvanceState()
+			if err != nil {
+				return err
+			}
+			accept = gollup.advanceHandler(gollup, input)
+		case libcmt.InspectState:
+			query, err := gollup.rollup.ReadInspectState()
+			if err != nil {
+				return err
+			}
+			accept = gollup.inspectHandler(gollup, query)
+		default:
+			panic("unreachable")
+		}
+	}
+}
+
+// ------------------------------------------------------------------------------------------------
+
+func (gollup *Gollup) SendVoucher(
+	address libcmt.Address,
+	value []byte,
+	data []byte,
+) (uint64, error) {
+	return gollup.rollup.EmitVoucher(address, value, data)
+}
+
+func (gollup *Gollup) SendNotice(data []byte) (uint64, error) {
+	return gollup.rollup.EmitNotice(data)
+}
+
+func (gollup *Gollup) SendReport(data []byte) error {
+	return gollup.rollup.EmitReport(data)
+}
+
+func (gollup *Gollup) RaiseException(data []byte) error {
+	return gollup.rollup.EmitException(data)
+}

pkg/libcmt/libcmt.go

@@ -0,0 +1,184 @@
+// (c) Cartesi and individual authors (see AUTHORS)
+// SPDX-License-Identifier: Apache-2.0 (see LICENSE)
+
+// Package libcmt provides bindings for the libcmt C library.
+// It facilitates the development of applications meant to run in the cartesi-machine
+// by handling IO and the communication protocol with the machine emulator.
+package libcmt
+
+// #cgo LDFLAGS: -lcmt
+// #include <stdlib.h>
+// #include <string.h>
+// #include "libcmt/abi.h"
+// #include "libcmt/io.h"
+// #include "libcmt/rollup.h"
+import "C"
+import (
+	"errors"
+	"fmt"
+	"unsafe"
+)
+
+type (
+	RequestType uint8
+	Address     = [20]byte
+)
+
+var (
+	ErrClosed = errors.New("rollup already closed")
+
+	ErrFinish           = errors.New("failed to finish")
+	ErrReadAdvanceState = errors.New("failed to read the advance's state")
+	ErrReadInspectState = errors.New("failed to read the inspect's state")
+	ErrEmitVoucher      = errors.New("failed to emit voucher")
+	ErrEmitNotice       = errors.New("failed to emit notice")
+	ErrEmitReport       = errors.New("failed to emit report")
+	ErrEmitException    = errors.New("failed to emit exception")
+)
+
+const (
+	AdvanceState RequestType = C.HTIF_YIELD_REASON_ADVANCE
+	InspectState RequestType = C.HTIF_YIELD_REASON_INSPECT
+)
+
+type Input struct {
+	ChainId        uint64
+	AppContract    Address
+	Sender         Address
+	BlockNumber    uint64
+	BlockTimestamp uint64
+	Index          uint64
+	Data           []byte
+}
+
+type Query struct {
+	Data []byte
+}
+
+type Rollup struct{ c *C.cmt_rollup_t }
+
+// NewRollup returns a new [Rollup].
+func NewRollup() (*Rollup, error) {
+	var c C.cmt_rollup_t
+	errno := C.cmt_rollup_init(&c)
+	rollup := &Rollup{c: &c}
+	return rollup, toError(errno)
+}
+
+// Close closes the rollup, rendering it unusable.
+// Close will return an error if it has already been called.
+func (rollup *Rollup) Close() error {
+	if rollup.c == nil {
+		return ErrClosed
+	}
+	C.cmt_rollup_fini(rollup.c)
+	rollup.c = nil
+	return nil
+}
+
+// Finish accepts or rejects the previous advance/inspect request.
+// It then waits for the next request and returns its type.
+func (rollup *Rollup) Finish(accept bool) (RequestType, error) {
+	finish := C.cmt_rollup_finish_t{accept_previous_request: C.bool(accept)}
+	errno := C.cmt_rollup_finish(rollup.c, &finish)
+	if err := toError(errno); err != nil {
+		return 0, fmt.Errorf("%w: %w", ErrFinish, err)
+	}
+	return RequestType(finish.next_request_type), nil
+}
+
+// ReadAdvanceState returns the [Input] from an advance-state request.
+func (rollup *Rollup) ReadAdvanceState() (Input, error) {
+	var advance C.cmt_rollup_advance_t
+	errno := C.cmt_rollup_read_advance_state(rollup.c, &advance)
+	if err := toError(errno); err != nil {
+		return Input{}, fmt.Errorf("%w: %w", ErrReadAdvanceState, err)
+	}
+	return Input{
+		ChainId:        uint64(advance.chain_id),
+		AppContract:    toAddress(advance.app_contract),
+		Sender:         toAddress(advance.msg_sender),
+		BlockNumber:    uint64(advance.block_number),
+		BlockTimestamp: uint64(advance.block_timestamp),
+		Index:          uint64(advance.index),
+		Data:           C.GoBytes(advance.payload, C.int(advance.payload_length)),
+	}, nil
+}
+
+// ReadInspectState returns the [Query] from an inspect-state request.
+func (rollup *Rollup) ReadInspectState() (Query, error) {
+	var inspect C.cmt_rollup_inspect_t
+	errno := C.cmt_rollup_read_inspect_state(rollup.c, &inspect)
+	if err := toError(errno); err != nil {
+		return Query{}, fmt.Errorf("%w: %w", ErrReadInspectState, err)
+	}
+	return Query{Data: C.GoBytes(inspect.payload, C.int(inspect.payload_length))}, nil
+}
+
+// EmitVoucher emits a voucher and returns its index.
+func (rollup *Rollup) EmitVoucher(address Address, value []byte, voucher []byte) (uint64, error) {
+	addressData := C.CBytes(address[:])
+	defer C.free(addressData)
+
+	valueLength, valueData := C.uint(len(value)), C.CBytes(value)
+	defer C.free(valueData)
+
+	voucherLength, voucherData := C.uint(len(voucher)), C.CBytes(voucher)
+	defer C.free(voucherData)
+
+	var index C.uint64_t
+	err := toError(C.cmt_rollup_emit_voucher(rollup.c,
+		C.CMT_ADDRESS_LENGTH, addressData,
+		valueLength, valueData,
+		voucherLength, voucherData,
+		&index,
+	))
+
+	return uint64(index), fmt.Errorf("%w: %w", ErrEmitVoucher, err)
+}
+
+// EmitNotice emits a notice and returns its index.
+func (rollup *Rollup) EmitNotice(notice []byte) (uint64, error) {
+	length, data := C.uint(len(notice)), C.CBytes(notice)
+	defer C.free(data)
+	var index C.uint64_t
+	err := toError(C.cmt_rollup_emit_notice(rollup.c, length, data, &index))
+	return uint64(index), fmt.Errorf("%w: %w", ErrEmitNotice, err)
+}
+
+// EmitReport emits a report.
+func (rollup *Rollup) EmitReport(report []byte) error {
+	length, data := C.uint(len(report)), C.CBytes(report)
+	defer C.free(data)
+	err := toError(C.cmt_rollup_emit_report(rollup.c, length, data))
+	return fmt.Errorf("%w: %w", ErrEmitReport, err)
+
+}
+
+// EmitException emits an exception.
+func (rollup *Rollup) EmitException(exception []byte) error {
+	length, data := C.uint(len(exception)), C.CBytes(exception)
+	defer C.free(data)
+	err := toError(C.cmt_rollup_emit_exception(rollup.c, length, data))
+	return fmt.Errorf("%w: %w", ErrEmitException, err)
+}
+
+// ------------------------------------------------------------------------------------------------
+
+func toError(errno C.int) error {
+	if errno < 0 {
+		s := C.strerror(-errno)
+		defer C.free(unsafe.Pointer(s))
+		return fmt.Errorf("%s (%d)", C.GoString(s), errno)
+	} else {
+		return nil
+	}
+}
+
+func toAddress(c [C.CMT_ADDRESS_LENGTH]C.uint8_t) Address {
+	var address Address
+	for i, v := range c {
+		address[i] = byte(v)
+	}
+	return address
+}