位置服务框架

更新时间：
2024-01-30
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位置服务框架

本节内容介绍 VSOA 位置服务框架的开发须知、步骤和注意事项。

开发须知

位置服务只有在未运行 ECSM 时才需要，若当前环境下已存在 ECSM，开发者无需按照如下步骤创建位置服务。

操作步骤

创建位置服务时，不同的开发语言在流程上略有区别，但总体都是按照如下步骤进行：

步骤 1：创建位置服务

每个位置服务需要有一个确定的端口，创建 VSOA 位置服务时，需要将服务端的服务名与服务端的端口对应。

/*
 * Application: position_demo
 */
#include <stdio.h>
#include <string.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/select.h>
#include "vsoa_position.h"
#include "vsoa_platform.h"

/* My position server */
static vsoa_position_server_t *pos_serv; 

/*
 * Query callback
 */
static void query (void *arg, int domain, const char *query_name, vsoa_position_response_t *response)
{
    struct sockaddr_in res;

    if (strcmp(query_name, "light_server") == 0) {
        if (domain < 0 || domain == AF_INET) {
            bzero(&res, sizeof(struct sockaddr_in));
            res.sin_family      = AF_INET;
            res.sin_port        = htons(3001);
            res.sin_addr.s_addr = inet_addr("127.0.0.1");

#ifdef VSOA_HAS_SIN_LEN
            res.sin_len = sizeof(struct sockaddr_in);
#endif
            vsoa_position_server_response(pos_serv, response,
                                          (struct sockaddr *)&res,
                                          sizeof(struct sockaddr_in), false);
            return;
        }

    } else if (strcmp(query_name, "axis_server") == 0) {
        if (domain < 0 || domain == AF_INET) {
            bzero(&res, sizeof(struct sockaddr_in));
            res.sin_family      = AF_INET;
            res.sin_port        = htons(3002);
            res.sin_addr.s_addr = inet_addr("127.0.0.1");

#ifdef VSOA_HAS_SIN_LEN
            res.sin_len = sizeof(struct sockaddr_in);
#endif
            vsoa_position_server_response(pos_serv, response,
                                          (struct sockaddr *)&res,
                                          sizeof(struct sockaddr_in), false);
            return;
        }
    }

    vsoa_position_server_response(pos_serv, response, NULL, 0, false);
}

/*
 * main function
 */
int main (int argc, char **argv)
{
    struct sockaddr_in pos_addr;

    bzero(&pos_addr, sizeof(struct sockaddr_in));
    pos_addr.sin_family      = AF_INET;
    pos_addr.sin_port        = htons(3000);
    pos_addr.sin_addr.s_addr = inet_addr("127.0.0.1");

#ifdef VSOA_HAS_SIN_LEN
    pos_addr.sin_len = sizeof(struct sockaddr_in);
#endif

    pos_serv = vsoa_position_server_create(query, NULL);
    if (!pos_serv) {
        fprintf(stderr, "Can not create VSOA position server!\n");
        return  (-1);
    }

    return  (0);
}


/*
 * position_demo.js
 */
var vsoa = require('vsoa');
var socket = require('socket');

/* Demo server address */
var servers = [
    {
        name: 'light_server',
        domain: socket.AF_INET,
        addr: '127.0.0.1',
        port: 3001,
        security: false
    },
    {
        name: 'axis_server',
        domain: socket.AF_INET,
        addr: '127.0.0.1',
        port: 3002,
        security: false
    }
];

/* Position server */
var position = new vsoa.Position(servers, {
    domain: socket.AF_INET, addr: '127.0.0.1', port: 3000
});

/*
* position_demo.java
*/
import java.net.InetSocketAddress;

import com.acoinfo.vsoa.Constant;
import com.acoinfo.vsoa.Position;
import com.acoinfo.vsoa.Position.PositionItem;

public class position_test {
    public static PositionItem servers[] = {
        new PositionItem("light_server", Constant.AF_INET, "127.0.0.1", 3001, false),
        new PositionItem("axis_server", Constant.AF_INET, "127.0.0.1", 3002, false)
    };

    static Position position;
    public static void main(String[] args) {
        position = new Position(servers, new InetSocketAddress("127.0.0.1", 3000));
    }
}

package main

import (
    "gitee.com/sylixos/go-vsoa/position"
)

func PositionTest() {
    /*
    *Create a new position list
    */
    pl := position.NewPositionList()

    /*
    *Add new positions to the list
    */
    pl.Add(*position.NewPosition("light_server", 1, "127.0.0.1", 3001, false))
    pl.Add(*position.NewPosition("axis_server", 1, "127.0.0.1", 3002, false))
}

func main() {
    PositionTest()
}

说明：
在 Node.js 的环境中，socket.AF_INET 应为 vsoa.AF_INET，详情可见 https://www.npmjs.com/package/vsoa 。

步骤 2：启动位置服务

#include <stdio.h>
#include <string.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/select.h>
#include "vsoa_position.h"
#include "vsoa_platform.h"

/* My position server */
static vsoa_position_server_t *pos_serv;

/*
 * Query callback
 */
static void query (void *arg, int domain, const char *query_name, vsoa_position_response_t *response)
{
    struct sockaddr_in res;

    if (strcmp(query_name, "light_server") == 0) {
        if (domain < 0 || domain == AF_INET) {
            bzero(&res, sizeof(struct sockaddr_in));
            res.sin_family      = AF_INET;
            res.sin_port        = htons(3001);
            res.sin_addr.s_addr = inet_addr("127.0.0.1");

#ifdef VSOA_HAS_SIN_LEN
            res.sin_len = sizeof(struct sockaddr_in);
#endif
            vsoa_position_server_response(pos_serv, response,
                                          (struct sockaddr *)&res,
                                          sizeof(struct sockaddr_in), false);
            return;
        }

    } else if (strcmp(query_name, "axis_server") == 0) {
        if (domain < 0 || domain == AF_INET) {
            bzero(&res, sizeof(struct sockaddr_in));
            res.sin_family      = AF_INET;
            res.sin_port        = htons(3002);
            res.sin_addr.s_addr = inet_addr("127.0.0.1");

#ifdef VSOA_HAS_SIN_LEN
            res.sin_len = sizeof(struct sockaddr_in);
#endif
            vsoa_position_server_response(pos_serv, response,
                                          (struct sockaddr *)&res,
                                          sizeof(struct sockaddr_in), false);
            return;
        }
    }

    vsoa_position_server_response(pos_serv, response, NULL, 0, false);
}

/*
 * main function
 */
int main (int argc, char **argv)
{
    struct sockaddr_in pos_addr;

    bzero(&pos_addr, sizeof(struct sockaddr_in));
    pos_addr.sin_family      = AF_INET;
    pos_addr.sin_port        = htons(3000);
    pos_addr.sin_addr.s_addr = inet_addr("127.0.0.1");

#ifdef VSOA_HAS_SIN_LEN
    pos_addr.sin_len = sizeof(struct sockaddr_in);
#endif

    pos_serv = vsoa_position_server_create(query, NULL);
    if (!pos_serv) {
        fprintf(stderr, "Can not create VSOA position server!\n");
        return  (-1);
    }

    if (!vsoa_position_server_start(pos_serv,
                                    (struct sockaddr *)&pos_addr,
                                    sizeof(struct sockaddr_in))) {
        fprintf(stderr, "Can not start VSOA position server!\n");
        return  (-1);
    }

    return  (0);
}

var vsoa = require('vsoa');
var socket = require('socket');

/* Demo server address */
var servers = [
    {
        name: 'light_server',
        domain: socket.AF_INET,
        addr: '127.0.0.1',
        port: 3001,
        security: false
    },
    {
        name: 'axis_server',
        domain: socket.AF_INET,
        addr: '127.0.0.1',
        port: 3002,
        security: false
    }
];

/* Position server */
var position = new vsoa.Position(servers, {
    domain: socket.AF_INET, addr: '127.0.0.1', port: 3000
});

position.start();

import java.net.InetSocketAddress;

import com.acoinfo.vsoa.Constant;
import com.acoinfo.vsoa.Position;
import com.acoinfo.vsoa.Position.PositionItem;

public class position_test {
    public static PositionItem servers[] = {
        new PositionItem("light_server", Constant.AF_INET, "127.0.0.1", 3001, false),
        new PositionItem("axis_server", Constant.AF_INET, "127.0.0.1", 3002, false)
    };

    static Position position;
    public static void main(String[] args) {
        position = new Position(servers, new InetSocketAddress("127.0.0.1", 3000));

        position.start();
    }
}

package main

import (
    "net"

    "gitee.com/sylixos/go-vsoa/position"
)

func PositionTest() {
    /*
    *Create a new position list
    */
    pl := position.NewPositionList()

    /*
    *Add new positions to the list
    */
    pl.Add(*position.NewPosition("light_server", 1, "127.0.0.1", 3001, false))
    pl.Add(*position.NewPosition("axis_server", 1, "127.0.0.1", 3002, false))

    /*
    *Start position listener
    */
    pl.ServePositionListener(net.UDPAddr{
        IP:   net.ParseIP("127.0.0.1"),
        Port: 3000,
    })
}

func main() {
    PositionTest()
}

步骤 3：监听事件或循环

#include <stdio.h>
#include <string.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/select.h>
#include "vsoa_position.h"
#include "vsoa_platform.h"

/* My position server */
static vsoa_position_server_t *pos_serv;

/*
 * Query callback
 */
static void query (void *arg, int domain, const char *query_name, vsoa_position_response_t *response)
{
    struct sockaddr_in res;

    if (strcmp(query_name, "light_server") == 0) {
        if (domain < 0 || domain == AF_INET) {
            bzero(&res, sizeof(struct sockaddr_in));
            res.sin_family      = AF_INET;
            res.sin_port        = htons(3001);
            res.sin_addr.s_addr = inet_addr("127.0.0.1");

#ifdef VSOA_HAS_SIN_LEN
            res.sin_len = sizeof(struct sockaddr_in);
#endif
            vsoa_position_server_response(pos_serv, response,
                                          (struct sockaddr *)&res,
                                          sizeof(struct sockaddr_in), false);
            return;
        }

    } else if (strcmp(query_name, "axis_server") == 0) {
        if (domain < 0 || domain == AF_INET) {
            bzero(&res, sizeof(struct sockaddr_in));
            res.sin_family      = AF_INET;
            res.sin_port        = htons(3002);
            res.sin_addr.s_addr = inet_addr("127.0.0.1");

#ifdef VSOA_HAS_SIN_LEN
            res.sin_len = sizeof(struct sockaddr_in);
#endif
            vsoa_position_server_response(pos_serv, response,
                                          (struct sockaddr *)&res,
                                          sizeof(struct sockaddr_in), false);
            return;
        }
    }

    vsoa_position_server_response(pos_serv, response, NULL, 0, false);
}

/*
 * main function
 */
int main (int argc, char **argv)
{
    int cnt, fd;
    fd_set fds;
    struct sockaddr_in pos_addr;

    bzero(&pos_addr, sizeof(struct sockaddr_in));
    pos_addr.sin_family      = AF_INET;
    pos_addr.sin_port        = htons(3000);
    pos_addr.sin_addr.s_addr = inet_addr("127.0.0.1");

#ifdef VSOA_HAS_SIN_LEN
    pos_addr.sin_len = sizeof(struct sockaddr_in);
#endif

    pos_serv = vsoa_position_server_create(query, NULL);
    if (!pos_serv) {
        fprintf(stderr, "Can not create VSOA position server!\n");
        return  (-1);
    }

    if (!vsoa_position_server_start(pos_serv,
                                    (struct sockaddr *)&pos_addr,
                                    sizeof(struct sockaddr_in))) {
        fprintf(stderr, "Can not start VSOA position server!\n");
        return  (-1);
    }

    while (1) {
        FD_ZERO(&fds);

        fd = vsoa_position_server_fd(pos_serv);
        if (fd >= 0) {
            FD_SET(fd, &fds);
        } else {
            fprintf(stderr, "VSOA position server file error!\n");
            return  (-1);
        }

        cnt = pselect(fd + 1, &fds, NULL, NULL, NULL, NULL);
        if (cnt > 0) {
            vsoa_position_server_input(pos_serv);
        }
    }

    return  (0);
}

var vsoa = require('vsoa');
var socket = require('socket');

/* Demo server address */
var servers = [
    {
        name: 'light_server',
        domain: socket.AF_INET,
        addr: '127.0.0.1',
        port: 3001,
        security: false
    },
    {
        name: 'axis_server',
        domain: socket.AF_INET,
        addr: '127.0.0.1',
        port: 3002,
        security: false
    }
];

/* Position server */
var position = new vsoa.Position(servers, {
    domain: socket.AF_INET, addr: '127.0.0.1', port: 3000
});

position.start();

require('iosched').forever();

import java.net.InetSocketAddress;

import com.acoinfo.vsoa.Constant;
import com.acoinfo.vsoa.Position;
import com.acoinfo.vsoa.Position.PositionItem;

public class position_test {
    public static PositionItem servers[] = {
        new PositionItem("light_server", Constant.AF_INET, "127.0.0.1", 3001, false),
        new PositionItem("axis_server", Constant.AF_INET, "127.0.0.1", 3002, false)
    };

    static Position position;
    public static void main(String[] args) {
        position = new Position(servers, new InetSocketAddress("127.0.0.1", 3000));

        position.start();

        while (true) {
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
            }
        }
    }
}

package main

import (
    "net"

    "gitee.com/sylixos/go-vsoa/position"
)

func PositionTest() {
    /*
    *Create a new position list
    */
    pl := position.NewPositionList()

    /*
    *Add new positions to the list
    */
    pl.Add(*position.NewPosition("light_server", 1, "127.0.0.1", 3001, false))
    pl.Add(*position.NewPosition("axis_server", 1, "127.0.0.1", 3002, false))

    /*
    *Start a position listener in a separate goroutine
    */
    go pl.ServePositionListener(net.UDPAddr{
        IP:   net.ParseIP("127.0.0.1"),
        Port: 6001,
    })
}

func main() {
    PositionTest()

    for {
        time.Sleep(1 * time.Second)
    }
}

说明：

在 Node.js 的环境中，不需要事件循环。

注意事项

C/C++ 位置服务编译时需链接如下表所示的 VSOA 动态库，在 RealEvo-IDE 中配置时请参考 C/C++ 开发示例，Linux 下开发请参考 搭建 Linux 运行环境 提供的 C 语言范例进行配置。

库名称功能
libvsoa-position.so提供位置服务功能
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