feat: Add bindings to emulator C API

CHANGELOG.md

@@ -44,6 +44,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Added `Makefile` to help node developers setup their environment
 - Added experimental sunodo validator mode
 - Added instructions on how to run the node with Docker
+- Added Cartesi Machine C API wrapper
 
 ### Changed
 

cmd/cartesi-machine/README.md

@@ -0,0 +1,31 @@
+# Go bindings to the Cartesi Machine C API
+
+## Quick Start
+
+Ensure that the emulator headers and libraries are installed or point to them with:
+```
+export CGO_CFLAGS="-I/foo/machine-emulator/src"
+export CGO_LDFLAGS="-L/foo/machine-emulator/src"
+
+```
+
+Build
+```
+go build
+``` 
+
+Point to the directory containing the image files
+```
+export CARTESI_IMAGES_PATH=<path-to-image-files>
+```
+
+Run
+```
+go run cmd/cartesi-machine/main.go --help
+go run cmd/cartesi-machine/main.go
+go run cmd/cartesi-machine/main.go --command="ls -l"
+go run cmd/cartesi-machine/main.go --max-mcycle=0 --store=/tmp/maquina
+go run cmd/cartesi-machine/main.go --load=/tmp/maquina --command="ls -l"
+go run cmd/cartesi-machine/main.go --load=/tmp/maquina --initial-hash --final-hash
+go run cmd/cartesi-machine/main.go --remote-address="localhost:5000"--load=/tmp/maquina --initial-hash --final-hash --command="ls -l"
+``` 

cmd/cartesi-machine/main.go

@@ -0,0 +1,195 @@
+// (c) Cartesi and individual authors (see AUTHORS)
+// SPDX-License-Identifier: Apache-2.0 (see LICENSE)
+
+// Simple command line interface to the Cartesi Machine C API wrapper
+
+package main
+
+import (
+	"flag"
+	"fmt"
+	"math"
+	"os"
+	"strings"
+
+	"github.com/cartesi/rollups-node/pkg/emulator"
+)
+
+func main() {
+	var machine *emulator.Machine
+	defer machine.Delete()
+	var mgr *emulator.RemoteMachineManager
+	defer mgr.Free()
+	var err error
+	runtimeConfig := &emulator.MachineRuntimeConfig{}
+
+	// Parse command line arguments
+	loadDir := flag.String("load", "", "load machine previously stored in <directory>")
+	storeDir := flag.String("store", "", "store machine to <directory>, where \"%h\" is substituted by the state hash in the directory name")
+	remoteAddress := flag.String("remote-address", "", "use a remote cartesi machine listening to <address> instead of running a local cartesi machine")
+	remoteShutdown := flag.Bool("remote-shutdown", false, "shutdown the remote cartesi machine after the execution")
+	noRemoteCreate := flag.Bool("no-remote-create", false, "use existing cartesi machine in the remote server instead of creating a new one")
+	noRemoteDestroy := flag.Bool("no-remote-destroy", false, "do not destroy the cartesi machine in the remote server after the execution")
+	ramImage := flag.String("ram-image", "", "name of file containing RAM image")
+	dtbImage := flag.String("dtb-image", "", "name of file containing DTB image (default: auto generated flattened device tree)")
+	maxMcycle := flag.Uint64("max-mcycle", math.MaxUint64, "stop at a given mcycle")
+	initialHash := flag.Bool("initial-hash", false, "print initial state hash before running machine")
+	finalHash := flag.Bool("final-hash", false, "print final state hash when done")
+	commandLine := flag.String("command", "", "command to run in the machine")
+	flag.Parse()
+
+	// Connect to remote server and load/get machine
+	if remoteAddress != nil && *remoteAddress != "" {
+		fmt.Println("Connecting to remote server at ", *remoteAddress)
+		if mgr, err = emulator.NewRemoteMachineManager(*remoteAddress); err != nil {
+			fmt.Fprintln(os.Stderr, "****** Error creating remote machine manager: ", err)
+			os.Exit(1)
+		}
+		if noRemoteCreate != nil && *noRemoteCreate {
+			fmt.Println("Using existing remote machine")
+			if machine, err = mgr.GetMachine(); err != nil {
+				fmt.Fprintln(os.Stderr, "****** Error getting remote machine: ", err)
+				os.Exit(1)
+			}
+		} else if loadDir != nil && *loadDir != "" {
+			fmt.Println("Loading remote machine from ", *loadDir)
+			if machine, err = mgr.LoadMachine(*loadDir, runtimeConfig); err != nil {
+				fmt.Fprintln(os.Stderr, "****** Error loading machine: ", err)
+				os.Exit(1)
+			}
+		}
+	} else if loadDir != nil && *loadDir != "" {
+		fmt.Println("Loading machine from ", *loadDir)
+		if machine, err = emulator.LoadMachine(*loadDir, runtimeConfig); err != nil {
+			fmt.Fprintln(os.Stderr, "****** Error loading machine: ", err)
+			os.Exit(1)
+		}
+	}
+
+	// No machine yet: build configuration and create machine
+	if machine == nil {
+		// build machine configuration
+		images_path := strings.TrimRight(os.Getenv("CARTESI_IMAGES_PATH"), "/") + "/"
+		cfg := emulator.NewDefaultMachineConfig()
+		cfg.Processor.Mimpid = math.MaxUint64
+		cfg.Processor.Marchid = math.MaxUint64
+		cfg.Processor.Mvendorid = math.MaxUint64
+		cfg.Ram.ImageFilename = images_path + "linux.bin"
+		if ramImage != nil && *ramImage != "" {
+			fmt.Println("Using RAM image: ", *ramImage)
+			cfg.Ram.ImageFilename = *ramImage
+		}
+		cfg.Ram.Length = 64 << 20
+		cfg.FlashDrive = []emulator.MemoryRangeConfig{
+			{
+				Start:         0x80000000000000,
+				Length:        0xffffffffffffffff,
+				Shared:        false,
+				ImageFilename: images_path + "rootfs.ext2",
+			},
+		}
+		cfg.Dtb.Bootargs = "quiet earlycon=sbi console=hvc0 rootfstype=ext2 root=/dev/pmem0 rw init=/usr/sbin/cartesi-init"
+		if dtbImage != nil && *dtbImage != "" {
+			cfg.Dtb.ImageFilename = *dtbImage
+		}
+		cfg.Dtb.Init = `echo "Opa!"
+			busybox mkdir -p /run/drive-label && echo "root" > /run/drive-label/pmem0\
+			USER=dapp
+		`
+		if commandLine != nil && *commandLine != "" {
+			cfg.Dtb.Init = *commandLine
+		}
+		// create machine using configuration
+		if mgr == nil {
+			fmt.Println("Creating local machine")
+			if machine, err = emulator.NewMachine(cfg, runtimeConfig); err != nil {
+				fmt.Fprintln(os.Stderr, "****** Error creating machine: ", err)
+				os.Exit(1)
+			}
+		} else {
+			fmt.Println("Creating remote machine")
+			if machine, err = mgr.NewMachine(cfg, runtimeConfig); err != nil {
+				fmt.Fprintln(os.Stderr, "****** Error creating remote machine: ", err)
+				os.Exit(1)
+			}
+
+		}
+	}
+
+	// No machine yet? Too bad
+	if machine == nil {
+		fmt.Fprintln(os.Stderr, "****** No machine to run")
+		os.Exit(1)
+	}
+
+	// Print initial hash
+	if initialHash != nil && *initialHash {
+		var hash *emulator.MerkleTreeHash
+		if hash, err = machine.GetRootHash(); err != nil {
+			fmt.Fprintln(os.Stderr, "****** Error getting root hash: ", err)
+			os.Exit(1)
+		}
+		fmt.Println("Initial hash: ", hash.String())
+	}
+
+	// Run machine
+	var breakReason emulator.BreakReason
+	if breakReason, err = machine.Run(*maxMcycle); err != nil {
+		fmt.Fprintln(os.Stderr, "****** Error running machine: ", err)
+		os.Exit(1)
+	}
+	switch breakReason {
+	case emulator.BreakReasonFailed:
+		fmt.Println("Machine failed")
+	case emulator.BreakReasonHalted:
+		fmt.Println("Machine halted")
+	case emulator.BreakReasonYieldedManually:
+		fmt.Println("Machine yielded manually")
+	case emulator.BreakReasonYieldedAutomatically:
+		fmt.Println("Machine yielded automatically")
+	case emulator.BreakReasonYieldedSoftly:
+		fmt.Println("Machine yielded softly")
+	case emulator.BreakReasonReachedTargetMcycle:
+		fmt.Println("Machine reached target mcycle")
+	default:
+		fmt.Println("Machine stopped for unknown reason")
+	}
+
+	cycle, _ := machine.ReadCSR(emulator.ProcCsrMcycle)
+	fmt.Println("mcycle: ", cycle)
+
+	// Print final hash
+	if finalHash != nil && *finalHash {
+		var hash *emulator.MerkleTreeHash
+		if hash, err = machine.GetRootHash(); err == nil {
+			fmt.Println("Final hash:   ", hash.String())
+		}
+	}
+
+	// Store machine
+	if storeDir != nil && *storeDir != "" {
+		fmt.Println("Storing machine in ", *storeDir)
+		if err = machine.Store(*storeDir); err != nil {
+			fmt.Fprintln(os.Stderr, "****** Error storing machine: ", err)
+			os.Exit(1)
+		}
+	}
+
+	// Cleanup
+	if mgr != nil {
+		if !*noRemoteDestroy {
+			fmt.Println("Destroying remote machine")
+			if err = machine.Destroy(); err != nil {
+				fmt.Fprintln(os.Stderr, "****** Error destroying remote machine: ", err)
+				os.Exit(1)
+			}
+		}
+		if *remoteShutdown {
+			fmt.Println("Shutting down remote machine")
+			if err = mgr.Shutdown(); err != nil {
+				fmt.Fprintln(os.Stderr, "****** Error shutting down remote server: ", err)
+				os.Exit(1)
+			}
+		}
+	}
+}