使用libevent实现最简单的android http-server

其实就是把libevent sample 下的http-server.c 在android emulator 上跑起来
环境:
libevent: libevent-2.0.12-stable
sdk     :  android-sdk-linux_86  支持到2.01
ndk     :  android-ndk-r4b-linux-x86

 

1. 交叉编译
  * 将libevent-2.0.12-stable 解压到home下libevent 目录
  * 执行: ./configure --prefix=/home/liu/android-ndk-r4b/samples/libevent_install --host=arm-linux CC=~/tools/arm-2007q3/bin/arm-none-linux-gnueabi-gcc CXX=~/tools/arm-2007q3/bin/arm-none-linux-gnueabi-g++
        make
        make install
    所有都安装到--prefix 所指定的目录中
 
  * libevent 的maillist 上有直接用ndk toolchain 交叉编译成功的例子,
    改成:
     ./configure --prefix=/home/liu/android-ndk-r4b/samples/libevent_install -host=arm-eabi CC=arm-linux-androideabi-gcc CPPFLAGS="-I$NDK_ROOT/platforms/android-8/arch-arm/usr/include/" CFLAGS="-nostdlib" LDFLAGS="-Wl,-rpath-link=$NDK_ROOT/platforms/android-8/arch-arm/usr/lib/ -L$NDK_ROOT/platforms/android-9/arch-arm/usr/lib/" LIBS="-lc"  
    听说也可以build成功libevent.so, 但是没弄成功
  
  不过还好文件不多,还是按照ndk 下写andorid make file

 

2. NDK下编译
  * 把libevent-2.0.12-stable 解压到home 目录下的libevent-ndk 目录下的jni 目录
  * 把前面交叉编译 生成的libevent/include/event2/event-config.h copy
     到libevent-ndk/jin/include/event2/ 下
  * 修改  event-config.h  如下:

/* #undef _EVENT_HAVE_ARC4RANDOM */
    这句下面加上:
    #define _EVENT_HAVE_ARC4RANDOM

    //#define _EVENT_HAVE_FD_MASK 1 这句用//注掉

    
  * 写android mk file
   ./configure 生成的makefile不是人写的,是机器生成的
   所以参考makefile.am ,具体jni目录下Android.mk 如下:
   

LOCAL_PATH := $(call my-dir)

#########################

# Build the libevent lib

include $(CLEAR_VARS)

LOCAL_MODULE := libevent

# devpoll.c kqueue.c evport.c

LOCAL_SRC_FILES := \

select.c \

poll.c \

epoll.c \

signal.c \

event.c evthread.c buffer.c \

bufferevent.c bufferevent_sock.c bufferevent_filter.c \

bufferevent_pair.c listener.c bufferevent_ratelim.c \

evmap.c log.c evutil.c evutil_rand.c strlcpy.c \

event_tagging.c http.c evdns.c evrpc.c

LOCAL_MODULE_TAGS := eng

#LOCAL_SYSTEM_SHARED_LIBRARIES := \

# libc

#LOCAL_SHARED_LIBRARIES := libc

LOCAL_LDLIBS := -lc

LOCAL_C_INCLUDES := $(LOCAL_PATH)/compat $(LOCAL_PATH)/include $(LOCAL_PATH)/

#$(LOCAL_PATH)/include/event2

LOCAL_CFLAGS := -O2 -g -W -Wall -DHAVE_CONFIG_H #-fno-strict-aliasing # liu -fno-strict-aliasing

LOCAL_PRELINK_MODULE := false

include $(BUILD_SHARED_LIBRARY)



#########################

# Build the test binary

include $(CLEAR_VARS)

LOCAL_SRC_FILES := test/test-init.c

LOCAL_MODULE := test_init

LOCAL_MODULE_TAGS := eng

#LOCAL_SYSTEM_SHARED_LIBRARIES := \

# libevent \

# libc

LOCAL_SHARED_LIBRARIES := libevent

LOCAL_LDLIBS := -lc

LOCAL_C_INCLUDES := $(LOCAL_PATH)/include

#LOCAL_CFLAGS := -O2 -g -W -Wall

include $(BUILD_EXECUTABLE)

#########################

# Build the httpd binary

include $(CLEAR_VARS)

LOCAL_SRC_FILES := sample/http-server.c

LOCAL_MODULE := test_httpd

LOCAL_MODULE_TAGS := eng

#LOCAL_SYSTEM_SHARED_LIBRARIES := \

# libevent \

# libc

LOCAL_SHARED_LIBRARIES := libevent

LOCAL_LDLIBS := -lc

LOCAL_C_INCLUDES := $(LOCAL_PATH)/include

#LOCAL_CFLAGS := -O2 -g -W -Wall

include $(BUILD_EXECUTABLE)

      

    * jin下的Application.mk
     ndk emulator goodfish 是arm926的
     支持armv5t就可以了
    内容如下:

APP_ABI := armeabi

  * 可以开始编译了
     在ndk 安装目录下执行
     ./ndk-build -C ~/libevent-ndk/
     成功之后在~/libevent-ndk/obj/local/armeabi目录下
     生成3个文件:libevent.so ,test,test_httpd    
    
    
3. 开始测试:
   买不起真机也没关系,使用emulator
   *   跑到sdk tools  目录下:
     执行 android create avd -n ndk_test -t 1 

     然后配置
     
   * 运行ndk_test emualtor
    执行  emulator @ndk_test
    跑起来后,缩到最小,以后不需要操作它了

    
   * 运行adb push
    将libevent.so ,test,test_httpd  3个
    文件全部push 到 emulator下的data目录下
   
   * 连到emualtor 下的httpd

     为了能在emulator 上跑，需要做下面修改
     修改jni\sample\http-server.c :

//handle = evhttp_bind_socket_with_handle(http, "0.0.0.0", port);

handle = evhttp_bind_socket_with_handle(http, "127.0.0.1", 6060);

     重新 ./ndk-build -C ~/libevent-ndk/
     把新的test_httpd push 到emualtor data 目录下
    
     执行 adb forward tcp:6060 tcp:6060

   * adb shell 运行:

     cd data

     ./test_httpd  /data

     显示：

     listening on 127.0.0.1:6060
     
   * 最后打开firefox 输入地址,可以看到：
   
  
4. 后续:
   可以继续深入libevent ,cgi,sqllite,写一个有实际作用的http server