refactor: move to a go-plugin based GRPC approach for bao

bao/Cargo.toml

@@ -5,10 +5,24 @@ edition = "2021"
 
 [dependencies]
 abao = { version = "0.2.0", features = ["group_size_256k", "tokio_io"], default-features = false }
-wasmedge-bindgen = "0.4.1"
-wasmedge-bindgen-macro = "0.4.1"
+anyhow = "1.0.71"
+async-stream = "0.3.5"
+async-trait = "0.1.68"
+atomic-counter = "1.0.1"
+futures = "0.3.28"
+gag = "1.0.0"
+hyper = "0.14.26"
+log = "0.4.17"
+parking_lot = "0.12.1"
+portpicker = "0.1.1"
+prost = "0.11.9"
+serde = { version = "1.0.163", features = ["derive"] }
+thiserror = "1.0.40"
+tokio = { version = "1.28.1", features = ["rt", "rt-multi-thread"] }
+tokio-stream = "0.1.14"
+tonic = "0.9.2"
+tonic-health = "0.9.2"
+tower = "0.4.13"
 
-[lib]
-name = "bao"
-path = "src/lib.rs"
-crate-type = ["cdylib"]
+[build-dependencies]
+tonic-build = "0.9.2"

bao/bao.go

@@ -2,46 +2,96 @@ package bao
 
 import (
 	_ "embed"
-	"errors"
-	"github.com/second-state/WasmEdge-go/wasmedge"
-	bindgen "github.com/second-state/wasmedge-bindgen/host/go"
+	"github.com/hashicorp/go-plugin"
 	"io"
+	"io/fs"
+	"log"
 	"os"
+	"os/exec"
+	"os/signal"
+	"syscall"
 )
 
-//go:embed target/wasm32-wasi/release/bao.wasm
-var wasm []byte
+//go:generate protoc --proto_path=proto/ bao.proto --go_out=proto  --go_opt=paths=source_relative --go-grpc_out=proto --go-grpc_opt=paths=source_relative
 
-var conf *wasmedge.Configure
+//go:embed target/release/bao
+var baoPlugin []byte
+var baoInstance Bao
+
+type Bao interface {
+	Init() (uint32, error)
+	Write(id uint32, data []byte) error
+	Finalize(id uint32) ([]byte, error)
+	Destroy(id uint32) error
+}
 
 func init() {
-	wasmedge.SetLogErrorLevel()
-	conf = wasmedge.NewConfigure(wasmedge.WASI)
+	baoExec, err := os.CreateTemp("", "lumeportal")
+
+	_, err = baoExec.Write(baoPlugin)
+	if err != nil {
+		log.Fatalf("Error:", err.Error())
+	}
+
+	err = baoExec.Sync()
+	if err != nil {
+		log.Fatalf("Error:", err.Error())
+	}
+
+	err = baoExec.Chmod(fs.ModePerm)
+	if err != nil {
+		log.Fatalf("Error:", err.Error())
+	}
+
+	err = baoExec.Close()
+	if err != nil {
+		log.Fatalf("Error:", err.Error())
+	}
+	pluginMap := map[string]plugin.Plugin{
+		"bao": &BAOPlugin{},
+	}
+	client := plugin.NewClient(&plugin.ClientConfig{
+		HandshakeConfig: plugin.HandshakeConfig{
+			ProtocolVersion:  1,
+			MagicCookieKey:   "foo",
+			MagicCookieValue: "bar",
+		},
+		Plugins:          pluginMap,
+		Cmd:              exec.Command("sh", "-c", baoExec.Name()),
+		AllowedProtocols: []plugin.Protocol{plugin.ProtocolGRPC},
+	})
+
+	// Connect via RPC
+	rpcClient, err := client.Client()
+	if err != nil {
+		log.Fatalf("Error:", err.Error())
+	}
+
+	// Request the plugin
+	raw, err := rpcClient.Dispense("bao")
+	if err != nil {
+		log.Fatalf("Error:", err.Error())
+	}
+
+	baoInstance = raw.(Bao)
+
+	signalCh := make(chan os.Signal, 1)
+	signal.Notify(signalCh, os.Interrupt, syscall.SIGTERM)
+
+	go func() {
+		<-signalCh
+		err := os.Remove(baoExec.Name())
+		if err != nil {
+			log.Fatalf("Error:", err.Error())
+		}
+	}()
+
 }
 
 func ComputeBaoTree(reader io.Reader) ([]byte, error) {
-	var vm = wasmedge.NewVMWithConfig(conf)
-	var wasi = vm.GetImportModule(wasmedge.WASI)
-	wasi.InitWasi(
-		os.Args[1:],     // The args
-		os.Environ(),    // The envs
-		[]string{".:."}, // The mapping preopens
-	)
-	err := vm.LoadWasmBuffer(wasm)
-	if err != nil {
-		return nil, err
-	}
-	err = vm.Validate()
-	if err != nil {
-		return nil, err
-	}
 
-	bg := bindgen.New(vm)
-	bg.Instantiate()
-
-	_, _, err = bg.Execute("init")
+	instance, err := baoInstance.Init()
 	if err != nil {
-		bg.Release()
 		return nil, err
 	}
 
@@ -50,7 +100,7 @@ func ComputeBaoTree(reader io.Reader) ([]byte, error) {
 		n, err := reader.Read(b)
 
 		if n > 0 {
-			err := write(*bg, &b)
+			err := write(instance, &b)
 			if err != nil {
 				return nil, err
 			}
@@ -59,7 +109,7 @@ func ComputeBaoTree(reader io.Reader) ([]byte, error) {
 		if err != nil {
 			var result []byte
 			if err == io.EOF {
-				result, err = finalize(*bg)
+				result, err = finalize(instance)
 				if err == nil {
 					return result, nil
 				}
@@ -69,37 +119,38 @@ func ComputeBaoTree(reader io.Reader) ([]byte, error) {
 	}
 }
 
-func write(bg bindgen.Bindgen, bytes *[]byte) error {
-	_, _, err := bg.Execute("write", *bytes)
+func write(instance uint32, bytes *[]byte) error {
+	err := baoInstance.Write(instance, *bytes)
 	if err != nil {
-		bg.Release()
+		derr := destroy(instance)
+		if derr != nil {
+			return derr
+		}
+		return err
+	}
+	if err != nil {
+		derr := destroy(instance)
+		if derr != nil {
+			return derr
+		}
 		return err
 	}
 
 	return nil
 }
 
-func finalize(bg bindgen.Bindgen) ([]byte, error) {
-	var byteResult []byte
-
-	result, _, err := bg.Execute("finalize")
+func finalize(instance uint32) ([]byte, error) {
+	result, err := baoInstance.Finalize(instance)
 	if err != nil {
-		bg.Release()
+		derr := destroy(instance)
+		if derr != nil {
+			return nil, derr
+		}
 		return nil, err
 	}
 
-	// Iterate over each element in the result slice
-	for _, elem := range result {
-		// Type assert the element to []byte
-		byteSlice, ok := elem.([]byte)
-		if !ok {
-			// If the element is not a byte slice, return an error
-			return nil, errors.New("result element is not a byte slice")
+	return result, nil
 }
-
-		// Concatenate the byte slice to the byteResult slice
-		byteResult = append(byteResult, byteSlice...)
-	}
-
-	return byteResult, nil
+func destroy(instance uint32) error {
+	return baoInstance.Destroy(instance)
 }

bao/build.rs

@@ -0,0 +1,15 @@
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    tonic_build::configure()
+        .build_server(true)
+        .out_dir("src/proto")
+        .compile_well_known_types(true)
+        .include_file("mod.rs")
+        .type_attribute(".", "#[derive(serde::Deserialize)]")
+        .type_attribute(".", "#[derive(serde::Serialize)]")
+        .compile(&[
+            "proto/grpc_stdio.proto",
+            "proto/bao.proto"
+        ], &["bao"])
+        .unwrap();
+    Ok(())
+}

bao/client.go

@@ -0,0 +1,47 @@
+package bao
+
+import (
+	"context"
+	"git.lumeweb.com/LumeWeb/portal/bao/proto"
+	"github.com/golang/protobuf/ptypes/empty"
+	"github.com/golang/protobuf/ptypes/wrappers"
+)
+
+// GRPCClient is an implementation of KV that talks over RPC.
+type GRPCClient struct{ client proto.BaoClient }
+
+func (g *GRPCClient) Init() (uint32, error) {
+	init, err := g.client.Init(context.Background(), &empty.Empty{})
+	if err != nil {
+		return 0, err
+	}
+
+	return init.Value, nil
+}
+
+func (g *GRPCClient) Write(id uint32, data []byte) error {
+	_, err := g.client.Write(context.Background(), &proto.WriteRequest{Id: id, Data: data})
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (g *GRPCClient) Finalize(id uint32) ([]byte, error) {
+	tree, err := g.client.Finalize(context.Background(), &wrappers.UInt32Value{Value: id})
+	if err != nil {
+		return nil, err
+	}
+
+	return tree.Value, nil
+}
+
+func (g *GRPCClient) Destroy(id uint32) error {
+	_, err := g.client.Destroy(context.Background(), &wrappers.UInt32Value{Value: id})
+	if err != nil {
+		return err
+	}
+
+	return nil
+}

bao/plugin.go

@@ -0,0 +1,21 @@
+package bao
+
+import (
+	"context"
+	"git.lumeweb.com/LumeWeb/portal/bao/proto"
+	"github.com/hashicorp/go-plugin"
+	"google.golang.org/grpc"
+)
+
+type BAOPlugin struct {
+	plugin.Plugin
+	Impl Bao
+}
+
+func (p *BAOPlugin) GRPCServer(broker *plugin.GRPCBroker, s *grpc.Server) error {
+	return nil
+}
+
+func (b *BAOPlugin) GRPCClient(_ context.Context, broker *plugin.GRPCBroker, c *grpc.ClientConn) (interface{}, error) {
+	return &GRPCClient{client: proto.NewBaoClient(c)}, nil
+}

bao/proto/bao.proto

@@ -0,0 +1,20 @@
+syntax = "proto3";
+
+import "google/protobuf/empty.proto";
+import "google/protobuf/wrappers.proto";
+
+option go_package = "git.lumeweb.com/LumeWeb/portal/bao/proto";
+
+package bao;
+
+message WriteRequest {
+    uint32 id = 1;
+    bytes data = 2;
+}
+
+service bao {
+    rpc Init (google.protobuf.Empty) returns (google.protobuf.UInt32Value);
+    rpc Write(WriteRequest) returns (google.protobuf.Empty);
+    rpc Finalize (google.protobuf.UInt32Value) returns (google.protobuf.BytesValue);
+    rpc Destroy (google.protobuf.UInt32Value) returns (google.protobuf.Empty);
+}

bao/proto/grpc_stdio.proto

@@ -0,0 +1,33 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
+syntax = "proto3";
+package plugin;
+option go_package = "plugin";
+
+import "google/protobuf/empty.proto";
+
+// GRPCStdio is a service that is automatically run by the plugin process
+// to stream any stdout/err data so that it can be mirrored on the plugin
+// host side.
+service GRPCStdio {
+    // StreamStdio returns a stream that contains all the stdout/stderr.
+    // This RPC endpoint must only be called ONCE. Once stdio data is consumed
+    // it is not sent again.
+    //
+    // Callers should connect early to prevent blocking on the plugin process.
+    rpc StreamStdio(google.protobuf.Empty) returns (stream StdioData);
+}
+
+// StdioData is a single chunk of stdout or stderr data that is streamed
+// from GRPCStdio.
+message StdioData {
+    enum Channel {
+        INVALID = 0;
+        STDOUT = 1;
+        STDERR = 2;
+    }
+
+    Channel channel = 1;
+    bytes data = 2;
+}

bao/src/grpc/error.rs

@@ -0,0 +1,34 @@
+use hyper::http::uri::InvalidUri;
+use thiserror::Error as ThisError;
+use tokio::sync::mpsc::error::SendError;
+use tonic::transport::Error as TonicError;
+use std::fmt::{Debug};
+
+pub fn into_status(err: Error) -> tonic::Status {
+    tonic::Status::unknown(format!("{}", err))
+}
+
+#[derive(Debug, ThisError)]
+pub enum Error {
+    #[error("Error with IO: {0}")]
+    Io(#[from] std::io::Error),
+    #[error("Error with tonic (gRPC) transport: {0}")]
+    TonicTransport(#[from] TonicError),
+    #[error("Error parsing string into a network address: {0}")]
+    AddrParser(#[from] std::net::AddrParseError),
+    #[error("Error sending on a mpsc channel: {0}")]
+    Send(String),
+    #[error("Invalid Uri: {0}")]
+    InvalidUri(#[from] InvalidUri),
+    #[error(transparent)]
+    Other(#[from] anyhow::Error),
+}
+
+impl<T> From<SendError<T>> for Error {
+    fn from(_err: SendError<T>) -> Self {
+        Self::Send(format!(
+            "unable to send {} on a mpsc channel",
+            std::any::type_name::<T>()
+        ))
+    }
+}

bao/src/grpc/grpc_stdio.rs

@@ -0,0 +1,98 @@
+// Copied from: https://github.com/hashicorp/go-plugin/blob/master/grpc_controller.go
+use anyhow::{Context, Result};
+use async_stream::stream;
+use futures::stream::Stream;
+use gag::BufferRedirect;
+use std::io::Read;
+use std::pin::Pin;
+use tokio::time::{sleep, Duration};
+use tokio_stream::StreamExt;
+use tonic::{async_trait, Request, Response, Status};
+use crate::proto::google::protobuf::Empty;
+use crate::proto::plugin::grpc_stdio_server::{GrpcStdio, GrpcStdioServer};
+use crate::proto::plugin::stdio_data::Channel;
+use crate::proto::plugin::{StdioData};
+use crate::grpc::error::into_status;
+
+const CONSOLE_POLL_SLEEP_MILLIS: u64 = 500;
+
+pub fn new_server() -> GrpcStdioServer<GrpcStdioImpl> {
+    GrpcStdioServer::new(GrpcStdioImpl {})
+}
+
+#[derive(Clone)]
+pub struct GrpcStdioImpl {}
+
+impl GrpcStdioImpl {
+    fn new_combined_stream() -> Result<<Self as GrpcStdio>::StreamStdioStream, Status> {
+        log::trace!("new_inner_stream called. Asked for a stream of stdout and stderr");
+        log::info!("Gagging stdout and stderr to a buffer for redirection to plugin's host.",);
+
+        let stdoutbuf = BufferRedirect::stdout()
+            .context("Failed to create a BufferRedirec from stdout")
+            .map_err(|e| e.into())
+            .map_err(into_status)?;
+        let stdout_stream = GrpcStdioImpl::new_stream("stdout", Channel::Stdout as i32, stdoutbuf);
+
+        let stderrbuf = BufferRedirect::stderr()
+            .context("Failed to create a BufferRedirec from stderr")
+            .map_err(|e| e.into())
+            .map_err(into_status)?;
+        let stderr_stream = GrpcStdioImpl::new_stream("stderr", Channel::Stderr as i32, stderrbuf);
+
+        let merged_stream = stdout_stream.merge(stderr_stream);
+
+        Ok(Box::pin(merged_stream))
+    }
+
+    fn new_stream(
+        stream_name: &'static str,
+        channel: i32,
+        mut redirected_buf: BufferRedirect,
+    ) -> impl Stream<Item = Result<StdioData, Status>> {
+        stream! {
+            loop {
+                log::trace!("beginning next iteration of {} reading and streaming...", stream_name);
+                let mut readbuf = String::new();
+                match redirected_buf.read_to_string(&mut readbuf) {
+                    Ok(len) => match len{
+                        0 => {
+                            log::trace!("{} had zero bytes. Sleeping to avoid polling...", stream_name);
+                            sleep(Duration::from_millis(CONSOLE_POLL_SLEEP_MILLIS)).await;
+                        },
+                        _ => {
+                            log::trace!("Sending {} {} bytes of data: {}", stream_name, len, readbuf);
+                            yield Ok(StdioData{
+                                channel,
+                                data: readbuf.into_bytes(),
+                            });
+                        },
+                    },
+                    Err(e) => {
+                        log::error!("Error reading {} data: {:?}", stream_name, e);
+                        yield Err(Status::unknown(format!("Error reading from Stderr of plugin's process: {:?}", e)));
+                    },
+                }
+            }
+        }
+    }
+}
+
+#[async_trait]
+impl GrpcStdio for GrpcStdioImpl {
+    type StreamStdioStream =
+    Pin<Box<dyn Stream<Item = Result<StdioData, Status>> + Send + 'static>>;
+
+    async fn stream_stdio(
+        &self,
+        _req: Request<Empty>,
+    ) -> Result<Response<Self::StreamStdioStream>, Status> {
+        log::trace!("stream_stdio called.");
+
+        let s = GrpcStdioImpl::new_combined_stream()?;
+
+        log::trace!("stream_stdio responding with a stream of StdioData.",);
+
+        Ok(Response::new(s))
+    }
+}

bao/src/grpc/mod.rs

@@ -0,0 +1,2 @@
+pub mod grpc_stdio;
+pub mod error;

bao/src/lib.rs

@@ -1,32 +0,0 @@
-use abao::encode::Encoder;
-use std::io::{Cursor, Write};
-#[allow(unused_imports)]
-use wasmedge_bindgen::*;
-use wasmedge_bindgen_macro::*;
-
-static mut TREE: Option<Vec<u8>> = None;
-static mut CURSOR: Option<Cursor<Vec<u8>>> = None;
-static mut ENCODER: Option<Encoder<Cursor<Vec<u8>>>> = None;
-
-#[wasmedge_bindgen]
-pub unsafe fn init() {
-    TREE = Option::Some(Vec::new());
-    CURSOR = Option::Some(Cursor::new(TREE.take().unwrap()));
-    ENCODER = Option::Some(Encoder::new_outboard(CURSOR.take().unwrap()));
-}
-
-#[wasmedge_bindgen]
-pub unsafe fn write(v: Vec<u8>) -> Result<u64, String> {
-    let encoder = ENCODER.take().unwrap();
-    let bytes_written = encoder.to_owned().write(&v).map_err(|e| e.to_string())?;
-    ENCODER = Some(encoder); // Restore the value
-    Ok(bytes_written as u64)
-}
-
-#[wasmedge_bindgen]
-pub unsafe fn finalize() -> Vec<u8> {
-    let mut encoder = ENCODER.take().unwrap();
-    let bytes = encoder.finalize().unwrap().as_bytes().to_vec();
-    ENCODER = Some(encoder); // Restore the value
-    bytes
-}

bao/src/main.rs

@@ -0,0 +1,116 @@
+#![feature(async_fn_in_trait)]
+#![allow(incomplete_features)]
+
+use std::collections::hash_map::Entry;
+use std::collections::HashMap;
+use std::io::{Cursor, Write};
+use std::sync::{Arc};
+
+use abao::encode::Encoder;
+use async_trait::async_trait;
+use atomic_counter::{AtomicCounter, ConsistentCounter};
+use parking_lot::Mutex;
+use tonic::{Request, Response, Status};
+use tonic::transport::Server;
+use tonic_health::server::HealthReporter;
+
+use crate::proto::bao::bao_server::{Bao, BaoServer};
+use crate::proto::bao::WriteRequest;
+use crate::proto::google::protobuf::{BytesValue, Empty, UInt32Value};
+use crate::unique_port::UniquePort;
+
+mod proto;
+mod unique_port;
+mod grpc;
+
+async fn driver_service_status(mut reporter: HealthReporter) {
+    reporter.set_serving::<BaoServer<BaoService>>().await;
+}
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let mut uport = UniquePort::default();
+    let port = uport.get_unused_port().expect("No ports free");
+    println!("{}", format!("1|1|tcp|127.0.0.1:{}|grpc", port));
+
+    let (mut health_reporter, health_service) = tonic_health::server::health_reporter();
+
+    health_reporter.set_serving::<BaoServer<BaoService>>().await;
+
+    tokio::spawn(driver_service_status(health_reporter.clone()));
+
+    let addr = format!("127.0.0.1:{}", port).parse().unwrap();
+    let bao_service = BaoService::default();
+    let server = BaoServer::new(bao_service);
+    Server::builder()
+        .add_service(health_service)
+        .add_service(server)
+        .add_service(grpc::grpc_stdio::new_server())
+        .serve(addr)
+        .await?;
+
+    Ok(())
+}
+
+#[derive(Debug, Default)]
+pub struct BaoService {
+    requests:  Arc<Mutex<HashMap<u32, Encoder<Cursor<Vec<u8>>>>>>,
+    counter: ConsistentCounter,
+}
+
+#[async_trait]
+impl Bao for BaoService {
+    async fn init(&self, _request: Request<Empty>) -> Result<Response<UInt32Value>, Status> {
+        let next_id = self.counter.inc() as u32;
+        let tree = Vec::new();
+        let cursor = Cursor::new(tree);
+        let encoder = Encoder::new(cursor);
+
+        let mut req = self.requests.lock();
+        req.insert(next_id, encoder);
+
+        Ok(Response::new(UInt32Value { value: next_id }))
+    }
+
+    async fn write(&self, request: Request<WriteRequest>) -> Result<Response<Empty>, Status> {
+        let r = request.into_inner();
+        let mut req = self.requests.lock();
+        if let Some(encoder) = req.get_mut(&r.id) {
+            encoder.write(&r.data)?;
+        } else {
+            return Err(Status::invalid_argument("invalid id"));
+        }
+
+        Ok(Response::new(Empty::default()))
+    }
+
+    async fn finalize(
+        &self,
+        request: Request<UInt32Value>,
+    ) -> Result<Response<BytesValue>, Status> {
+        let r = request.into_inner();
+        let mut req = self.requests.lock();
+        match req.entry(r.value) {
+            Entry::Occupied(mut entry) => {
+                let encoder = entry.get_mut();
+                let ret = encoder.finalize().unwrap();
+                let bytes = ret.as_bytes().to_vec();
+                Ok(Response::new(BytesValue { value: bytes }))
+            }
+            Entry::Vacant(_) => {
+                Err(Status::invalid_argument("invalid id"))
+            }
+        }
+    }
+
+
+    async fn destroy(&self, request: Request<UInt32Value>) -> Result<Response<Empty>, Status> {
+        let r = request.into_inner();
+        let mut req = self.requests.lock();
+        if req.remove(&r.value).is_none() {
+            return Err(Status::invalid_argument("invalid id"));
+        }
+
+        Ok(Response::new(Empty::default()))
+    }
+}

bao/src/unique_port.rs

@@ -0,0 +1,45 @@
+use portpicker::Port;
+
+pub struct UniquePort {
+    vended_ports: Vec<Port>,
+}
+
+impl UniquePort {
+    pub fn new() -> Self {
+        Self {
+            vended_ports: vec![],
+        }
+    }
+
+    pub fn get_unused_port(&mut self) -> Option<Port> {
+        let mut counter = 0;
+
+        loop {
+            counter += 1;
+            if counter > 1000 {
+                // no luck in 1000 tries? Give up!
+                return None;
+            }
+
+            match portpicker::pick_unused_port() {
+                None => return None,
+                Some(p) => {
+                    if self.vended_ports.contains(&p) {
+                        log::trace!("Skipped port: {} because it is in the list of previously vended ports: {:?}", p, self.vended_ports);
+                        continue;
+                    } else {
+                        log::trace!("Vending port: {}", p);
+                        self.vended_ports.push(p);
+                        return Some(p);
+                    }
+                }
+            }
+        }
+    }
+}
+
+impl Default for UniquePort {
+    fn default() -> Self {
+        Self::new()
+    }
+}