WIP: C bindings

1 files changed, 171 insertions, 0 deletions

diff --git a/test/test_msgnet_c.c b/test/test_msgnet_c.c
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+++ b/test/test_msgnet_c.c
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+/**
+ * Copyright (c) 2018 Cornell University.
+ *
+ * Author: Ted Yin <[email protected]>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is furnished to do
+ * so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#include "salticidae/event.h"
+#include "salticidae/network.h"
+#include "salticidae/stream.h"
+
+/** Hello Message. */
+const uint8_t msg_hello_opcode = 0x0;
+typedef struct MsgHello {
+    const char *name;
+    const char *text;
+} MsgHello;
+/** Defines how to serialize the msg. */
+datastream_t msg_hello_serialize(const char *name, const char *text) {
+    datastream_t *serialized = msgnet_
+    serialized << htole((uint32_t)name.length());
+    serialized << name << text;
+}
+
+/** Defines how to parse the msg. */
+MsgHello MsgHello(DataStream &&s) {
+    MsgHello res;
+    uint32_t len;
+    s >> len;
+    len = letoh(len);
+    res.name = std::string((const char *)s.get_data_inplace(len), len);
+    len = s.size();
+    res.text = std::string((const char *)s.get_data_inplace(len), len);
+    return res;
+}
+
+/** Acknowledgement Message. */
+struct MsgAck {
+    static const uint8_t opcode = 0x1;
+    DataStream serialized;
+    MsgAck() {}
+    MsgAck(DataStream &&s) {}
+};
+
+const uint8_t MsgHello::opcode;
+const uint8_t MsgAck::opcode;
+
+using MsgNetworkByteOp = MsgNetwork<uint8_t>;
+
+typedef struct MyNet {
+    msgnetwork_t *net;
+    const std::string name;
+    const NetAddr peer;
+} MyNet;
+
+void msg_hello_handler(const msg_t *msg, const msgnetwork_conn_t *conn) {
+
+}
+
+void msg_ack_handler(const msg_t *msg, const msgnetwork_conn_t *conn) {
+}
+
+void alice_conn_handler(const msgnetwork_conn_t *conn, bool connected) {
+    if (connected)
+    {
+        if (conn->get_mode() == ConnPool::Conn::ACTIVE)
+        {
+            puts("[alice] Connected, sending hello.");
+            /* send the first message through this connection */
+            msgnetwork_send_msg(alice,
+                msg_hello_serialize("alice", "Hello there!"), conn);
+        }
+        else
+            printf("[alice] Accepted, waiting for greetings.\n",
+                    this->name.c_str());
+    }
+    else
+    {
+        printf("[alice] Disconnected, retrying.\n", this->name.c_str());
+        /* try to reconnect to the same address */
+        connect(conn->get_addr());
+    }
+}
+
+MyNet mynet_new(const salticidae::EventContext &ec,
+                const char *name,
+                const netaddr_t *peer) {
+    MyNet res;
+    const msgnetwork_config_t *netconfig = msgnetwork_config_new();
+    res.net = msgnetwork_new(ec, netconfig);
+    res.name = name;
+    res.peer = peer;
+
+    /* message handler could be a bound method */
+    reg_handler(salticidae::generic_bind(&MyNet::on_receive_hello, this, _1, _2));
+
+    reg_conn_handler([this](const ConnPool::conn_t &conn, bool connected) {
+        });
+    }
+
+    void on_receive_hello(MsgHello &&msg, const MyNet::conn_t &conn) {
+        printf("[%s] %s says %s\n",
+                name.c_str(),
+                msg.name.c_str(), msg.text.c_str());
+        /* send acknowledgement */
+        send_msg(MsgAck(), conn);
+    }
+};
+
+
+void on_receive_ack(MsgAck &&msg, const MyNet::conn_t &conn) {
+    auto net = static_cast<MyNet *>(conn->get_net());
+    printf("[%s] the peer knows\n", net->name.c_str());
+}
+
+int main() {
+    salticidae::EventContext ec;
+    NetAddr alice_addr("127.0.0.1:12345");
+    NetAddr bob_addr("127.0.0.1:12346");
+
+    /* test two nodes in the same main loop */
+    MyNet alice(ec, "Alice", bob_addr);
+    MyNet bob(ec, "Bob", alice_addr);
+
+    /* message handler could be a normal function */
+    alice.reg_handler(on_receive_ack);
+    bob.reg_handler(on_receive_ack);
+
+    /* start all threads */
+    alice.start();
+    bob.start();
+
+    /* accept incoming connections */
+    alice.listen(alice_addr);
+    bob.listen(bob_addr);
+
+    /* try to connect once */
+    alice.connect(bob_addr);
+    bob.connect(alice_addr);
+
+    /* the main loop can be shutdown by ctrl-c or kill */
+    auto shutdown = [&](int) {ec.stop();};
+    salticidae::SigEvent ev_sigint(ec, shutdown);
+    salticidae::SigEvent ev_sigterm(ec, shutdown);
+    ev_sigint.add(SIGINT);
+    ev_sigterm.add(SIGTERM);
+
+    /* enter the main loop */
+    ec.dispatch();
+    return 0;
+}