libhv/examples/curl.cpp

/*
 * @build: make examples
 * @server bin/httpd -s restart -d
 * @usage: bin/curl -v www.baidu.com
 *         bin/curl -v 127.0.0.1:8080
 *         bin/curl -v 127.0.0.1:8080/ping
 *         bin/curl -v 127.0.0.1:8080/echo -d 'hello,world!'
 */

/*
 * @介绍：curl是一个著名的URL命令行工具，支持ftp、telnet、smtp、http等多种协议，
 *        最常用的还是用作http请求，这个示例代码使用libhv的http客户端实现了类似功能。
 *
 */

#include "http_client.h"

#ifdef _MSC_VER
#include "misc/win32_getopt.h"
#else
#include <getopt.h>
#endif

static int  http_version    = 1;
static int  grpc            = 0;
static bool verbose         = false;
static const char* url      = NULL;
static const char* method   = NULL;
static const char* headers  = NULL;
static const char* range    = NULL;
static const char* data     = NULL;
static const char* form     = NULL;
static int send_count       = 1;

static const char* options = "hVvX:H:r:d:F:n:";
static const struct option long_options[] = {
    {"help",    no_argument,        NULL,   'h'},
    {"verion",  no_argument,        NULL,   'V'},
    {"verbose", no_argument,        NULL,   'v'},
    {"method",  required_argument,  NULL,   'X'},
    {"header",  required_argument,  NULL,   'H'},
    {"range",   required_argument,  NULL,   'r'},
    {"data",    required_argument,  NULL,   'd'},
    {"form",    required_argument,  NULL,   'F'},
    {"http2",   no_argument,        &http_version, 2},
    {"grpc",    no_argument,        &grpc,  1},
    {"count",   required_argument,  NULL,   'n'},
    {NULL,      0,                  NULL,   0}
};
static const char* help = R"(Options:
    -h|--help           Print this message.
    -V|--version        Print version.
    -v|--verbose        Show verbose infomation.
    -X|--method         Set http method.
    -H|--header         Add http headers, -H "Content-Type:application/json Accept:*/*"
    -r|--range          Add http header Range: bytes=0-1023
    -d|--data           Set http body.
    -F|--form           Set http form, -F "name1=content;name2=@filename"
    -n|--count          Send request count, used for test keep-alive
       --http2          Use http2
       --grpc           Use grpc over http2
Examples:
    curl -v localhost:8080
    curl -v localhost:8080 -X HEAD
    curl -v localhost:8080 -r 0-9
    curl -v localhost:8080/ping
    curl -v localhost:8080/query?page_no=1&page_size=10
    curl -v localhost:8080/echo  -d 'hello,world!'
    curl -v localhost:8080/kv    -H "Content-Type:application/x-www-form-urlencoded" -d 'user=admin&pswd=123456'
    curl -v localhost:8080/json  -H "Content-Type:application/json"                  -d '{"user":"admin","pswd":"123456"}'
    curl -v localhost:8080/form  -F 'file=@filename'
)";

void print_usage() {
    printf("Usage: curl [%s] url\n", options);
}
void print_version() {
    printf("curl version 1.0.0\n");
}
void print_help() {
    print_usage();
    puts(help);
    print_version();
}

int parse_cmdline(int argc, char* argv[]) {
    int opt;
    int opt_idx;
    while ((opt = getopt_long(argc, argv, options, long_options, &opt_idx)) != EOF) {
        switch(opt) {
        case 'h': print_help();     exit(0);
        case 'V': print_version();  exit(0);
        case 'v': verbose = true;   break;
        case 'X': method = optarg;  break;
        case 'H': headers = optarg; break;
        case 'r': range = optarg;   break;
        case 'd': data = optarg;    break;
        case 'F': form = optarg;    break;
        case 'n': send_count = atoi(optarg); break;
        default: break;
        }
    }

    if (optind == argc) {
        printf("Missing url\n");
        print_usage();
        exit(-1);
    }
    url = argv[optind];

    return 0;
}

int main(int argc, char* argv[]) {
    if (argc < 2) {
        print_usage();
        return 0;
    }

    parse_cmdline(argc, argv);

    int ret = 0;
    // 解析命令行参数，填充到请求对象
    HttpRequest req;
    if (grpc) {
        http_version = 2;
        req.content_type = APPLICATION_GRPC;
    }
    if (http_version == 2) {
        req.http_major = 2;
        req.http_minor = 0;
    }
    req.url = url;
    if (method) {
        req.method = http_method_enum(method);
    }
    enum {
        s_key,
        s_value,
    } state = s_key;
    if (headers) {
        const char* p = headers;
        const char* key = p;
        const char* value = NULL;
        int key_len = 0;
        int value_len = 0;
        state = s_key;
        while (*p != '\0') {
            if (*p == ' ') {
                if (key_len && value_len) {
                    req.headers[std::string(key,key_len)] = std::string(value,value_len);
                    key_len = value_len = 0;
                }
                state = s_key;
                key = p+1;
            }
            else if (*p == ':') {
                state = s_value;
                value = p+1;
            }
            else {
                state == s_key ? ++key_len : ++value_len;
            }
            ++p;
        }
        if (key_len && value_len) {
            req.headers[std::string(key,key_len)] = std::string(value,value_len);
            key_len = value_len = 0;
        }
    }
    if (range) {
        req.headers["Range"] = std::string("bytes=").append(range);
    }
    if (data || form) {
        if (method == NULL) {
            req.method = HTTP_POST;
        }
        if (data) {
            req.body = data;
        }
        else if (form) {
            const char* p = form;
            const char* key = p;
            const char* value = NULL;
            int key_len = 0;
            int value_len = 0;
            state = s_key;
            while (*p != '\0') {
                if (*p == ' ') {
                    if (key_len && value_len) {
                        FormData data;
                        if (*value == '@') {
                            data.filename = std::string(value+1, value_len-1);
                        }
                        else {
                            data.content = std::string(value, value_len);
                        }
                        req.form[std::string(key,key_len)] = data;
                        key_len = value_len = 0;
                    }
                    state = s_key;
                    key = p+1;
                }
                else if (*p == '=') {
                    state = s_value;
                    value = p+1;
                }
                else {
                    state == s_key ? ++key_len : ++value_len;
                }
                ++p;
            }
            if (key_len && value_len) {
                // printf("key=%.*s value=%.*s\n", key_len, key, value_len, value);
                FormData data;
                if (*value == '@') {
                    data.filename = std::string(value+1, value_len-1);
                }
                else {
                    data.content = std::string(value, value_len);
                }
                req.form[std::string(key,key_len)] = data;
            }
        }
    }
    HttpResponse res;
    // 创建http客户端
    http_client_t* hc = http_client_new();
send:
    // 发送请求，接收响应
    ret = http_client_send(hc, &req, &res);
    if (verbose) {
        printf("%s\n", req.Dump(true,true).c_str());
    }
    if (ret != 0) {
        printf("* Failed:%s:%d\n", http_client_strerror(ret), ret);
    }
    else {
        if (verbose) {
            printf("%s\n", res.Dump(true,true).c_str());
        }
        else {
            printf("%s\n", res.body.c_str());
        }
    }
    if (--send_count > 0) {
        printf("send again later...%d\n", send_count);
#ifdef _WIN32
        Sleep(3*1000);
#else
        sleep(3);
#endif
        goto send;
    }
    // 销毁http客户端
    http_client_del(hc);
    return ret;
}