implemented basic request

CMakeLists.txt

@@ -23,6 +23,7 @@ add_library(webfuse_static STATIC
     src/webfuse/filesystem/empty_filesystem.cpp
     src/webfuse/ws/config.cpp
     src/webfuse/ws/server.cpp
+    src/webfuse/ws/message.cpp
 )
 
 target_include_directories(webfuse_static PUBLIC src)

doc/protocol.md

@@ -0,0 +1,36 @@
+# Webufse 2 Protocol
+
+## Endianness
+
+All numeric data types are transferred in [Big Endian](https://en.wikipedia.org/wiki/Endianness).  
+For instance, the uint32 value 1 will be transferred as
+
+    00 00 00 01
+
+## Data Types
+
+### Basic data types
+
+| Data | Width  | Description |
+| ---- | ------ | ----------- |
+| bool |  8 bit | Represents a boolean value |
+| i32  | 32 bit |
+
+## Message
+
+
+
+## Methods
+
+### access
+
+| Field | Data Type        | Description |
+| ----- | ---------------- | ----------- |
+|       | uint32           | message id  |
+| type  | uint8            | message type (0x00) |
+| path  | string           | |
+| mode  | access_mode (i8) |
+
+#### Response
+
+| Field |

script/provider.py

@@ -1,11 +1,157 @@
 #!/usr/bin/env python3
 
 import asyncio
+import os
 import websockets
+import errno
 
-async def hello():
+F_OK = 0
-    async with websockets.connect('ws://localhost:8081') as websocket:
+R_OK = 4
-            await websocket.send('Hello')
+W_OK = 2
-            await websocket.recv()
+X_OK = 1
 
-asyncio.run(hello())
+RESPONSE = 0x80
+
+ERRNO = {
+    -errno.E2BIG        :   -7,
+    -errno.EACCES       :  -13,
+    -errno.EAGAIN       :  -11,
+    -errno.EBADF        :   -9,
+    -errno.EBUSY        :  -16,
+    -errno.EDESTADDRREQ :  -89,
+    -errno.EDQUOT       : -122,
+    -errno.EEXIST       :  -17,
+    -errno.EFAULT       :  -14,
+    -errno.EFBIG        :  -27,
+    -errno.EINTR        :   -4,
+    -errno.EINVAL       :  -22,
+    -errno.EIO          :   -5,
+    -errno.EISDIR       :  -21,
+    -errno.ELOOP        :  -40,
+    -errno.EMFILE       :  -24,
+    -errno.EMLINK       :  -31,
+    -errno.ENAMETOOLONG :  -36,
+    -errno.ENFILE       :  -23,
+    -errno.ENODATA      :  -61,
+    -errno.ENODEV       :  -19,
+    -errno.ENOENT       :   -2,
+    -errno.ENOMEM       :  -12,
+    -errno.ENOSPC       :  -28,
+    -errno.ENOSYS       :  -38,
+    -errno.ENOTDIR      :  -20,
+    -errno.ENOTEMPTY    :  -39,
+    -errno.ENOTSUP      :  -95,
+    -errno.ENXIO        :   -6,
+    -errno.EOVERFLOW    :  -75,
+    -errno.EPERM        :   -1,
+    -errno.EPIPE        :  -32,
+    -errno.ERANGE       :  -34,
+    -errno.EROFS        :  -30,
+    -errno.ETXTBSY      :  -26,
+    -errno.EXDEV        :  -18
+}
+
+class MessageReader:
+    def __init__(self, buffer):
+        self.buffer = buffer
+        self.offset = 0
+
+    def read_u8(self):
+        value = self.buffer[self.offset]
+        self.offset += 1
+        return value
+    
+    def read_u32(self):
+        value = (self.buffer[self.offset] << 24) + (self.buffer[self.offset + 1] << 16) + (self.buffer[self.offset + 2] << 8) + self.buffer[self.offset + 3]
+        self.offset += 4
+        return value
+
+    def read_str(self):
+        return self.read_bytes().decode()
+
+    def read_bytes(self):
+        size = self.read_u32()
+        value = self.buffer[self.offset : self.offset + size]
+        self.offset += size
+        return value
+
+    def read_path(self, base_path):
+        local_path = self.read_str().lstrip('/')
+        return os.path.join(base_path, local_path)
+
+    def read_access_mode(self):
+        value = self.read_u8()
+        mode  = os.F_OK if F_OK == (value & F_OK) else 0
+        mode += os.R_OK if R_OK == (value & R_OK) else 0
+        mode += os.W_OK if W_OK == (value & W_OK) else 0
+        mode += os.X_OK if X_OK == (value & X_OK) else 0
+        return mode
+
+
+class MessageWriter:
+    def __init__(self, message_id, message_type):
+        self.buffer = []
+        self.write_u32(message_id)
+        self.write_u8(message_type)
+    
+    def write_u8(self, value):
+        self.buffer.append(value)
+    
+    def write_u32(self, value):
+        a = (value >> 24) & 0xff
+        b = (value >> 16) & 0xff
+        c = (value >>  8) & 0xff
+        d = value         & 0xff
+        self.buffer.extend([a, b, c, d])
+
+    def write_i32(self, value):
+        self.write_u32(value & 0xffffffff)
+    
+    def write_result(self, value):
+        if 0 > value:
+            if value in ERRNO:
+                value = ERRNO[value]
+        self.write_i32(value)
+
+    def get_bytes(self):
+        return bytearray(self.buffer)
+        
+
+class FilesystemProvider:
+    def __init__(self, path, url):
+        self.root = os.path.abspath(path)
+        self.url = url
+        self.commands = {
+            0x01: FilesystemProvider.access
+        }
+    
+    async def run(self):
+        async with websockets.connect(self.url) as connection:
+            while True:
+                request = await connection.recv()
+                reader = MessageReader(request)
+                message_id = reader.read_u32()
+                message_type = reader.read_u8()
+                writer = MessageWriter(message_id, RESPONSE + message_type)
+                if message_type in self.commands:
+                    method = self.commands[message_type]
+                    method(self, reader, writer)
+                else:
+                    print("unknown message type: %d" % message_type)
+                response = writer.get_bytes()
+                await connection.send(response)
+
+    def access(self, reader, writer):
+        path = reader.read_path(self.root)
+        mode = reader.read_access_mode()
+        result = -errno.EACCES
+        try:
+            if os.access(path, mode) == True:
+                result = 0
+        except OSError as ex:
+            result = -ex.errno
+        writer.write_result(result)
+
+if __name__ == '__main__':
+    provider = FilesystemProvider('.', 'ws://localhost:8081')
+    asyncio.run(provider.run())

src/webfuse/filesystem.cpp

@@ -18,8 +18,10 @@ status filesystem::access(std::string const & path, access_mode mode)
 {
     try
     {
-        std::string req;
+        message req(message_type::access_req);
-        auto resp = proxy.perform(req).get();
+        req.add_str(path);
+        req.add_i8(mode);
+        proxy.perform(std::move(req));
         return status::bad_enoent;
     }
     catch(...)
@@ -32,8 +34,8 @@ status filesystem::getattr(std::string const & path, file_attributes & attr)
 {
     try
     {
-        std::string req;
+        message req(message_type::getattr_req);
-        auto resp = proxy.perform(req).get();
+        proxy.perform(std::move(req));
         return status::bad_enoent;
     }
     catch(...)
@@ -46,8 +48,8 @@ status filesystem::readlink(std::string const & path, std::string & out)
 {
     try
     {
-        std::string req;
+        message req(message_type::readlink_req);
-        auto resp = proxy.perform(req).get();
+        proxy.perform(std::move(req));
         return status::bad_enoent;
     }
     catch(...)
@@ -60,8 +62,8 @@ status filesystem::symlink(std::string const & target, std::string const & linkp
 {
     try
     {
-        std::string req;
+        message req(message_type::symlink_req);
-        auto resp = proxy.perform(req).get();
+        proxy.perform(std::move(req));
         return status::bad_enoent;
     }
     catch(...)
@@ -74,8 +76,8 @@ status filesystem::link(std::string const & old_path, std::string const & new_pa
 {
     try
     {
-        std::string req;
+        message req(message_type::link_req);
-        auto resp = proxy.perform(req).get();
+        proxy.perform(std::move(req));
         return status::bad_enoent;
     }
     catch(...)
@@ -88,8 +90,8 @@ status filesystem::rename(std::string const & old_path, std::string const & new_
 {
     try
     {
-        std::string req;
+        message req(message_type::rename_req);
-        auto resp = proxy.perform(req).get();
+        proxy.perform(std::move(req));
         return status::bad_enoent;
     }
     catch(...)
@@ -102,8 +104,8 @@ status filesystem::chmod(std::string const & path, filemode mode)
 {
     try
     {
-        std::string req;
+        message req(message_type::chmod_req);
-        auto resp = proxy.perform(req).get();
+        proxy.perform(std::move(req));
         return status::bad_enoent;
     }
     catch(...)
@@ -116,8 +118,8 @@ status filesystem::chown(std::string const & path, user_id uid, group_id gid)
 {
     try
     {
-        std::string req;
+        message req(message_type::chown_req);
-        auto resp = proxy.perform(req).get();
+        proxy.perform(std::move(req));
         return status::bad_enoent;
     }
     catch(...)
@@ -130,8 +132,8 @@ status filesystem::truncate(std::string const & path, uint64_t offset, filehandl
 {
     try
     {
-        std::string req;
+        message req(message_type::truncate_req);
-        auto resp = proxy.perform(req).get();
+        proxy.perform(std::move(req));
         return status::bad_enoent;
     }
     catch(...)
@@ -144,8 +146,8 @@ status filesystem::fsync(std::string const & path, bool is_datasync, filehandle
 {
     try
     {
-        std::string req;
+        message req(message_type::fsync_req);
-        auto resp = proxy.perform(req).get();
+        proxy.perform(std::move(req));
         return status::bad_enoent;
     }
     catch(...)
@@ -158,8 +160,8 @@ status filesystem::open(std::string const & path, openflags flags, filehandle &
 {
     try
     {
-        std::string req;
+        message req(message_type::open_req);
-        auto resp = proxy.perform(req).get();
+        proxy.perform(std::move(req));
         return status::bad_enoent;
     }
     catch(...)
@@ -172,8 +174,8 @@ status filesystem::mknod(std::string const & path, filemode mode, uint64_t rdev)
 {
     try
     {
-        std::string req;
+        message req(message_type::mknod_req);
-        auto resp = proxy.perform(req).get();
+        proxy.perform(std::move(req));
         return status::bad_enoent;
     }
     catch(...)
@@ -186,8 +188,8 @@ status filesystem::create(std::string const & path, filemode mode, filehandle &
 {
     try
     {
-        std::string req;
+        message req(message_type::create_req);
-        auto resp = proxy.perform(req).get();
+        proxy.perform(std::move(req));
         return status::bad_enoent;
     }
     catch(...)
@@ -200,8 +202,8 @@ status filesystem::release(std::string const & path, filehandle handle)
 {
     try
     {
-        std::string req;
+        message req(message_type::release_req);
-        auto resp = proxy.perform(req).get();
+        proxy.perform(std::move(req));
         return status::bad_enoent;
     }
     catch(...)
@@ -214,8 +216,8 @@ status filesystem::unlink(std::string const & path)
 {
     try
     {
-        std::string req;
+        message req(message_type::unlink_req);
-        auto resp = proxy.perform(req).get();
+        proxy.perform(std::move(req));
         return status::bad_enoent;
     }
     catch(...)
@@ -228,8 +230,8 @@ status filesystem::read(std::string const & path, char * buffer, size_t buffer_s
 {
     try
     {
-        std::string req;
+        message req(message_type::read_req);
-        auto resp = proxy.perform(req).get();
+        proxy.perform(std::move(req));
         return status::bad_enoent;
     }
     catch(...)
@@ -242,8 +244,8 @@ status filesystem::write(std::string const & path, char const * buffer, size_t b
 {
     try
     {
-        std::string req;
+        message req(message_type::write_req);
-        auto resp = proxy.perform(req).get();
+        proxy.perform(std::move(req));
         return status::bad_enoent;
     }
     catch(...)
@@ -256,8 +258,8 @@ status filesystem::mkdir(std::string const & path, filemode mode)
 {
     try
     {
-        std::string req;
+        message req(message_type::mkdir_req);
-        auto resp = proxy.perform(req).get();
+        proxy.perform(std::move(req));
         return status::bad_enoent;
     }
     catch(...)
@@ -270,8 +272,8 @@ status filesystem::readdir(std::string const & path, std::vector<std::string> &
 {
     try
     {
-        std::string req;
+        message req(message_type::readdir_req);
-        auto resp = proxy.perform(req).get();
+        proxy.perform(std::move(req));
         return status::bad_enoent;
     }
     catch(...)
@@ -284,8 +286,8 @@ status filesystem::rmdir(std::string const & path)
 {
     try
     {
-        std::string req;
+        message req(message_type::rmdir_req);
-        auto resp = proxy.perform(req).get();
+        proxy.perform(std::move(req));
         return status::bad_enoent;
     }
     catch(...)
@@ -298,8 +300,8 @@ status filesystem::statfs(std::string const & path, filesystem_statistics & stat
 {
     try
     {
-        std::string req;
+        message req(message_type::statfs_req);
-        auto resp = proxy.perform(req).get();
+        proxy.perform(std::move(req));
         return status::bad_enoent;
     }
     catch(...)

src/webfuse/message_type.hpp

@@ -0,0 +1,37 @@
+#ifndef WEBFUSE_MESSAGETYPE_HPP
+#define WEBFUSE_MESSAGETYPE_HPP
+
+#include <cinttypes>
+
+namespace webfuse
+{
+
+enum class message_type: uint8_t
+{
+    access_req   = 0x01,
+    getattr_req  = 0x02,
+    readlink_req = 0x03,
+    symlink_req  = 0x04,
+    link_req     = 0x05,
+    rename_req   = 0x06,
+    chmod_req    = 0x07,
+    chown_req    = 0x08,
+    truncate_req = 0x09,
+    fsync_req    = 0x0a,
+    open_req     = 0x0b,
+    mknod_req    = 0x0c,
+    create_req   = 0x0d,
+    release_req  = 0x0e,
+    unlink_req   = 0x0f,
+    read_req     = 0x10,
+    write_req    = 0x11,
+    mkdir_req    = 0x12,
+    readdir_req  = 0x13,
+    rmdir_req    = 0x14,
+    statfs_req   = 0x15 
+};
+
+
+}
+
+#endif

src/webfuse/ws/message.cpp

@@ -0,0 +1,129 @@
+#include "message.hpp"
+#include <libwebsockets.h>
+
+namespace webfuse
+{
+
+message::message(message_type msg_type)
+: id(0)
+, data(LWS_PRE)
+{
+    add_u32(0);
+    add_u8(static_cast<uint8_t>(msg_type));
+}
+
+message::message(message && other)
+{
+    this->id = other.id;
+    this->data = std::move(other.data);
+}
+
+message& message::operator=(message && other)
+{
+    if (this != &other)
+    {
+        this->id = other.id;
+        this->data = std::move(other.data);
+    }
+
+    return *this;
+}
+
+void message::set_id(uint32_t value)
+{
+    id = id;
+    data[LWS_PRE    ] = (id >> 24) & 0xff;
+    data[LWS_PRE + 1] = (id >> 16) & 0xff;
+    data[LWS_PRE + 2] = (id >>  8) & 0xff;
+    data[LWS_PRE + 3] =  id        & 0xff;
+}
+
+uint32_t message::get_id() const
+{
+    return id;
+}
+
+void message::add_bool(bool value)
+{
+    data.push_back(value ? 0x01 : 0x00);
+}
+
+void message::add_u8(uint8_t value)
+{
+    data.push_back(value);
+}
+
+void message::add_i8(int8_t value)
+{
+    data.push_back(static_cast<uint8_t>(value));
+}
+
+void message::add_i32(int32_t value)
+{
+    add_u32((static_cast<uint32_t>(value)));
+}
+
+void message::add_u32(uint32_t value)
+{
+    auto const offset = data.size(); 
+    data.resize(offset + 4);
+    data[offset    ] = (value >> 24) & 0xff;
+    data[offset + 1] = (value >> 16) & 0xff;
+    data[offset + 2] = (value >>  8) & 0xff;
+    data[offset + 3] =  value        & 0xff;
+}
+
+void message::add_u64(uint64_t value)
+{
+    auto const offset = data.size(); 
+    data.resize(offset + 8);
+    data[offset    ] = (value >> 56) & 0xff;
+    data[offset + 1] = (value >> 48) & 0xff;
+    data[offset + 2] = (value >> 40) & 0xff;
+    data[offset + 3] = (value >> 32) & 0xff;
+    data[offset + 4] = (value >> 24) & 0xff;
+    data[offset + 5] = (value >> 16) & 0xff;
+    data[offset + 6] = (value >>  8) & 0xff;
+    data[offset + 7] =  value        & 0xff;
+}
+
+void message::add_str(std::string const &value)
+{
+    add_data(value.data(), value.size());
+}
+
+void message::add_data(char const * buffer, size_t size)
+{
+    uint32_t const effective_size = size & 0xffffffff;
+    add_u32(effective_size);
+
+    if (size > 0)
+    {
+        auto const offset = data.size();
+        data.resize(offset + effective_size);
+        void * to = reinterpret_cast<void*>(&data.data()[offset]);
+        void const * from = reinterpret_cast<void const *>(buffer);
+        memcpy(to, from, effective_size);
+    }
+}
+
+void message::add_strings(std::vector<std::string> const & list)
+{
+    uint32_t const count = list.size() & 0xffffffff;
+    add_u32(count);
+    for (auto const & item: list)
+    {
+        add_str(item);
+    }
+}
+
+unsigned char * message::get_data(size_t &size)
+{
+    size = data.size() - LWS_PRE;
+    void * result = reinterpret_cast<void *>(&data.data()[LWS_PRE]);
+
+    return reinterpret_cast<unsigned char *>(result);
+}
+
+
+}

src/webfuse/ws/message.hpp

@@ -0,0 +1,45 @@
+#ifndef WEBFUSE_MESSAGEBUILDER_HPP
+#define WEBFUSE_MESSAGEBUILDER_HPP
+
+#include "webfuse/message_type.hpp"
+
+#include <cinttypes>
+#include <string>
+#include <vector>
+
+namespace webfuse
+{
+
+class message
+{
+    message(message const &) = delete;
+    message& operator=(message const &) = delete;
+public:
+    explicit message(message_type msg_type);
+    ~message() = default;
+    message(message && other);
+    message& operator=(message && other);
+
+    void set_id(uint32_t value);
+    uint32_t get_id() const;
+
+    void add_bool(bool value);
+    void add_u8(uint8_t value);
+    void add_i8(int8_t value);
+    void add_i32(int32_t value);
+    void add_u32(uint32_t value);
+    void add_u64(uint64_t value);
+    void add_str(std::string const &value);
+    void add_data(char const * buffer, size_t size);
+    void add_strings(std::vector<std::string> const & list);
+
+    unsigned char * get_data(size_t &size);
+
+private:
+    uint32_t id;
+    std::vector<uint8_t> data;
+};
+
+}
+
+#endif

src/webfuse/ws/messagereader.hpp

@@ -0,0 +1,23 @@
+#ifndef WEBFUSE_MESSAGEREADER_HPP
+#define WEBFUSE_MESSAGEREADER_HPP
+
+#include <string>
+
+namespace webfuse
+{
+
+class messagereader
+{
+
+public:
+    explicit messagereader(std::string && value);
+    ~messagereader() = default;
+
+private:
+    std::string data;
+    size_t pos;
+};
+
+}
+
+#endif

src/webfuse/ws/server.cpp

@@ -1,40 +1,108 @@
 #include "webfuse/ws/server.hpp"
+#include "webfuse/ws/message.hpp"
+
 #include <libwebsockets.h>
+
+#include <cinttypes>
 #include <cstring>
 
 #include <iostream>
 #include <thread>
 #include <atomic>
+#include <mutex>
+#include <future>
+#include <chrono>
 #include <stdexcept>
 
+#include <queue>
+#include <string>
+#include <unordered_map>
+
+
+namespace
+{
+
+struct user_data
+{
+    struct lws * connection = nullptr;
+
+    std::mutex mut;
+    std::queue<webfuse::message> requests;
+    std::unordered_map<uint32_t, std::promise<std::string>> pending_responses;
+};
+
+}
+
 extern "C"
 {
 
 static int ws_server_callback(struct lws *wsi, enum lws_callback_reasons reason,
     void *user, void *in, size_t len)
 {
+    auto const * protocol = lws_get_protocol(wsi);
+    if (nullptr == protocol) { return 0; }
+    if (&ws_server_callback != protocol->callback) { return 0; }
+
+    auto * data = reinterpret_cast<user_data *>(protocol->user);
+
+    int result = 0;
     switch(reason)
     {
-        case LWS_CALLBACK_PROTOCOL_INIT:
-            std::cout << "lws: protocol init "<< std::endl;
-            break;
         case LWS_CALLBACK_ESTABLISHED:
             std::cout << "lws: established "<< std::endl;
+            if (nullptr == data->connection)
+            {
+                data->connection = wsi;
+            }
+            else
+            {
+                result = -1;
+            }
             break;
         case LWS_CALLBACK_CLOSED:
             std::cout << "lws: closed "<< std::endl;
+            if (wsi == data->connection)
+            {
+                data->connection = nullptr;
+            }
             break;
         case LWS_CALLBACK_RECEIVE:
             std::cout << "lws: receive "<< std::endl;
             break;
         case LWS_CALLBACK_SERVER_WRITEABLE:
             std::cout << "lws: server writable "<< std::endl;
+            {
+                webfuse::message msg(webfuse::message_type::access_req);
+                bool has_msg = false;
+                bool has_more = false;
+
+                {
+                    std::lock_guard lock(data->mut);
+                    has_msg = !(data->requests.empty());
+                    if (has_msg)
+                    {
+                        has_msg = true;
+                        msg = std::move(data->requests.front());
+                        data->requests.pop();
+
+                        has_more = !(data->requests.empty());
+                    }
+                }
+
+                if (has_msg)
+                {
+                    size_t size;
+                    unsigned char * raw_data = msg.get_data(size);
+                    int const rc = lws_write(data->connection, raw_data, size, LWS_WRITE_BINARY);
+                }
+
+            }
             break;
         default:
             break;
     }
 
-    return 0;
+    return result;
 }
 
 
@@ -57,7 +125,7 @@ public:
         protocols[0].name = "webfuse2";
         protocols[0].callback = &ws_server_callback;
         protocols[0].per_session_data_size = 0;
-        protocols[0].user = nullptr;
+        protocols[0].user = reinterpret_cast<void*>(&data);
 
         memset(reinterpret_cast<void*>(&info), 0, sizeof(info));
         info.port = config.port;
@@ -74,6 +142,22 @@ public:
         thread = std::thread([this]() {
             while (!shutdown_requested)
             {
+                {
+                    std::lock_guard lock(data.mut);
+                    if (!data.requests.empty())
+                    {
+                        if (nullptr != data.connection)
+                        {
+                            lws_callback_on_writable(data.connection);
+                        }
+                        else
+                        {
+                            data.requests = std::move(std::queue<webfuse::message>());
+                            data.pending_responses.clear();
+                        }
+                    }
+                }
+
                 lws_service(context, 0);
             }
 
@@ -93,6 +177,7 @@ public:
     lws_protocols protocols[2];
     lws_context_creation_info info;
     lws_context * context;
+    user_data data;
 };
 
 ws_server::ws_server(ws_config const & config)
@@ -124,20 +209,26 @@ ws_server& ws_server::operator=(ws_server && other)
     return *this;
 }
 
-std::future<std::string> ws_server::perform(std::string const & req)
+void ws_server::perform(message msg)
 {
-    std::promise<std::string> resp;
+    std::future<std::string> f;
+    {
+        std::promise<std::string> p;
+        f = p.get_future();
 
-    try
+        std::lock_guard lock(d->data.mut);
-    {
+        d->data.requests.emplace(std::move(msg));
-        throw std::runtime_error("not implemented");
+        d->data.pending_responses.emplace(42, std::move(p));
     }
-    catch (std::exception const & ex)
+
+    lws_cancel_service(d->context);
+    if(std::future_status::timeout == f.wait_for(std::chrono::seconds(1)))
     {
-        resp.set_exception(std::current_exception());
+        throw std::runtime_error("timeout");
     }
-    
+    std::string resp = f.get();
-    return resp.get_future();
+
+    throw std::runtime_error("not implemented");
 }
 
 

src/webfuse/ws/server.hpp

@@ -2,8 +2,12 @@
 #define WEBFUSE_WSSERVER_HPP
 
 #include "webfuse/ws/config.hpp"
-#include <future>
+#include "webfuse/ws/message.hpp"
+
+#include <vector>
 #include <string>
+#include <memory>
+
 namespace webfuse
 {
 
@@ -16,7 +20,8 @@ public:
     ~ws_server();
     ws_server(ws_server && other);
     ws_server& operator=(ws_server && other);
-    std::future<std::string> perform(std::string const & req);
+    
+    void perform(message msg);
 private:
     class detail;
     detail * d;