gsoap入门
1 使用gsoap搭建web service
参考了参考文档[2]中的介绍，有一点点修改。
1.1 编译calc客户端
- 根据
wsdl文件生成gsoap用的头文件
wsdl2h -o calc.h http://www.genivia.com/calc.wsdl
- 如果用我们自己搭建的webserver，需要修改头文件中的如下代码，
把port字段修改为自己的webservice的url。
//gsoap ns2 service port: http://websrv.cs.fsu.edu/~engelen/calcserver.cgi
改为
//gsoap ns2 service port: http://localhost:9999/cgi-bin/calcserver.cgi
- 生成client proxy类的源代码
soapcpp2 -j -CL -I/usr/share/gsoap/import calc.h
-j生成C++ proxy类，供client调用，-CL生成客户端程序，-I指明gsoap相关头文件路径，这个根据gsoap安装位置而定，例子中的路径是ubuntu通过apt-get安装的gsoap的路径。
- 编写client程序
calcclient.cpp
#include "calc.nsmap" // XML namespace mapping table (only needed once at the global level)
#include "soapcalcProxy.h" // the proxy class, also #includes "soapH.h" and "soapStub.h"
int main()
{
calcProxy calc;
double sum;
if (calc.add(1.23, 4.56, sum) == SOAP_OK)
std::cout << "Sum = " << sum << std::endl;
else
calc.soap_stream_fault(std::cerr);
calc.destroy(); // same as: soap_destroy(calc.soap);
soap_end(calc.soap);
}
调用proxy类calcProxy 的 add方法，传递了2个参数1.23 4.56，打印结果。
- 编译
c++ -o calcclient calcclient.cpp soapC.cpp soapcalcProxy.cpp -lgsoap++
如果第二步没修改port的话，这时候执行calcclient就能得到结果了，如果修改了port，我们需要自己搭建一个webservice来提供calc服务。
1.2 搭建服务器
1.2.1 编译服务器端程序
- 与client第一步一样，生成
calc.h
wsdl2h -o calc.h http://www.genivia.com/calc.wsdl
- 生成server端的接口类
soapcpp2 -j -SL -I/usr/share/gsoap/import calc.h
- 编写cgi程序
calcserver.cpp，实现calc服务器端的接口
#include "calc.nsmap" // XML namespace mapping table (only needed once at the global level)
#include "soapcalcService.h" // the service class, also #includes "soapH.h" and "soapStub.h"
int main()
{
calcService calc(SOAP_XML_INDENT);
if (calc.serve() != SOAP_OK)
calc.soap_stream_fault(std::cerr);
calc.destroy(); // same as: soap_destroy(calc.soap);
soap_end(calc.soap);
}
int calcService::add(double a, double b, double &result)
{
result = a + b;
return SOAP_OK;
}
int calcService::sub(double a, double b, double &result)
{
result = a - b;
return SOAP_OK;
}
int calcService::mul(double a, double b, double &result)
{
result = a * b;
return SOAP_OK;
}
int calcService::div(double a, double b, double &result)
{
if (b == 0.0)
{
char *msg = (char*)soap_malloc(this->soap, 1024);
snprintf(msg, 1024, "Trying to divide %f by zero", a);
return this->soap_senderfault(msg, NULL);
}
result = a / b;
return SOAP_OK;
}
int calcService::pow(double a, double b, double &result)
{
result = ::pow(a, b);
// soap_errno is like errno, but compatible with Win32
if (soap_errno == EDOM)
{
char *msg = (char*)soap_malloc(this->soap, 1024);
snprintf(msg, 1024, "<error xmlns=\"http://tempuri.org/\">Can't take power of %f to %f</error>", a, b);
return this->soap_senderfault("Power function domain error", msg);
}
return SOAP_OK;
}
- 编译，测试
c++ -o calcserver calcserver.cpp soapC.cpp soapcalcService.cpp -lgsoap++
./calcserver < calc.add.req.xml
这时候calcserver是一个cgi程序，从标准输入读取soap命令，输出到标准输出上。接下来搭建一个webserver来提供cgi服务。
1.2.2 搭建cgi服务器
简单起见，使用docker启动一个apache来作为web server。
- 下载apache镜像
docker pull httpd:2.4
- 修改
http.conf文件，启动apache对cgi的支持。
取得http.conf文件，修改其中的cgi支持，打开下面内容的注释即可
LoadModule cgi_module modules/mod_cgi.so
- http.conf在docker container的路径为：
/usr/local/apache2/conf/httpd.conf - 这步不做的话，运行client的时候，会提示如下错误，即apache把cgi请求当成了下载文件的请求。
Error 200 fault: SOAP-ENV:Client[no subcode]
"Error 200"
Detail: [no detail]
- 启动服务,在
calcserver和http.conf所在目录输入如下命令:
docker run -it --rm --name my-apache-app -p 9999:80 -v "$PWD":/usr/local/apache2/cgi-bin -v "$PWD"/http.conf:/usr/local/apache2/conf/httpd.conf -v /usr/lib/x86_64-linux-gnu/libgsoap++.so.4:/usr/lib/x86_64-linux-gnu/libgsoap++.so.4 httpd:2.4
1.3 其他
1.3.1 问题
gsoap也支持自己作为web服务器提供服务，只需要修改server代码，即可，但我没有试验成功。
int main()
{
calcService calc(SOAP_XML_INDENT);
//if (calc.serve() != SOAP_OK) <--这里改为调用run
if (calc.run(9999) != SOAP_OK)
calc.soap_stream_fault(std::cerr);
calc.destroy(); // same as: soap_destroy(calc.soap);
soap_end(calc.soap);
}
这时运行服务器程序时始终提示：
setsockopt unset IPV6_V6ONLY failed in soap_bind()
1.3.2 curl调试webservice服务器
可以使用curl模拟客户端请求一个soap服务[4]，命令如下：
curl -v --header "content-type: application/soap+xml" --data @calc.add.req.xml localhost:9999/cgi-bin/calcserver.cgi
2 编译arm-linux版本的gsoap
2.1 下载gsoap源码
http://liquidtelecom.dl.sourceforge.net/project/gsoap2/gSOAP/gsoap_2.8.33.zip
2.2 配置编译环境
- 下载linaro toolchain，解压到目录
/usr/local/linaro-multilib-2014.06-gcc4.9 - 设置
PATH环境变量。export PATH=/usr/local/linaro-multilib-2014.06-gcc4.9:$PATH
2.3 config&make
2.3.1 生成makefile
gsoap-2.8$ ./configure --host=arm-linux-gnueabihf --prefix=/usr/local/arm-linux
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for arm-linux-gnueabihf-strip... arm-linux-gnueabihf-strip
checking for a thread-safe mkdir -p... /bin/mkdir -p
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking whether make supports nested variables... yes
checking build system type... x86_64-unknown-linux-gnu
checking host system type... arm-unknown-linux-gnueabihf
checking whether make sets $(MAKE)... (cached) yes
checking for arm-linux-gnueabihf-g++... arm-linux-gnueabihf-g++
checking whether the C++ compiler works... yes
checking for C++ compiler default output file name... a.out
checking for suffix of executables...
checking whether we are cross compiling... yes
...
-
--host=arm-linux-gnueabihf- 表明编译的库是运行在arm linux上，这个也是gcc编译器的前缀。 -
--prefix=/usr/local/arm-linux- 表明变编译好的库的安装路径
2.3.2 手动生成wsdl.h文件
gsoap-2.8$ cd gsoap/wsdl
gsoap-2.8/gsoap/wsdl$ ../../target-amd64/bin/soapcpp2 -SC -pwsdl -I. -I../../gsoap/import ./wsdl.h
** The gSOAP code generator for C and C++, soapcpp2 release 2.8.33
** Copyright (C) 2000-2016, Robert van Engelen, Genivia Inc.
** All Rights Reserved. This product is provided "as is", without any warranty.
** The soapcpp2 tool and its generated software are released under the GPL.
** ----------------------------------------------------------------------------
** A commercial use license is available from Genivia Inc., contact@genivia.com
** ----------------------------------------------------------------------------
soapcpp2: using both options -C and -S omits client/server code
Saving wsdlStub.h annotated copy of the source interface file
Saving wsdlH.h serialization functions to #include in projects
Saving xmime.nsmap namespace mapping table
Saving wsdlC.cpp serialization functions
Compilation successful
../../target-amd64/bin/soapcpp2这个是你的host机器可以运行的soapcpp2
如果不做这步，在编译过程中会提示如下错误，因为编译时，生成的soapcpp2是只能在arm linux上运行的。
make[4]: Entering directory `/home/meng/git/gsoap-2.8/gsoap/wsdl'
../../gsoap/src/soapcpp2 -SC -pwsdl -I. -I../../gsoap/import ./wsdl.h
/bin/bash: ../../gsoap/src/soapcpp2: cannot execute binary file: Exec format error
make[4]: *** [wsdlC.cpp] Error 126
2.3.3 修改代码
修改config.h文件，删除最后一行的#define malloc rpl_malloc
否则编译会出错
`
2.3.4 修改makefile
修改gsoap/wsdl目录下的Makefile，删除下面2行（因为wsdl2h对其他库有依赖，并且我们也不需要arm版本的wsdl2h程序）：
wsdl2h$(EXEEXT): $(wsdl2h_OBJECTS) $(wsdl2h_DEPENDENCIES) $(EXTRA_wsdl2h_DEPENDENCIES)
#@rm -f wsdl2h$(EXEEXT)
#$(AM_V_CXXLD)$(wsdl2h_LINK) $(wsdl2h_OBJECTS) $(wsdl2h_LDADD) $(LIBS)
2.3.5 编译，安装
gsoap-2.8$ make
gsoap-2.8$ make install
在目录/usr/local/arm-linux下是编译好的gsoap库，注：我们没有编译出来arm linux版本的wadl2h。
2.4 编译arm-linux版calcserver.cgi
- 编译cgi版本的calcserver.cgi
calcserver$ arm-linux-gnueabihf-g++ -o calcserver.cgi calcserver.cpp soapC.cpp soapcalcService.cpp -lgsoap++ -DWITH_FASTCGI -L/usr/local/arm-linux/lib -I/usr/local/arm-linux/include
- 编译支持fastcgi版本的calcserver.cgi[5]
calcserver$ arm-linux-gnueabihf-g++ -o calcserver.cgi calcserver.cpp soapC.cpp soapcalcService.cpp /gsoap-source-path/gsoap/stdsoap2.cpp -DWITH_FASTCGI -I/usr/local/arm-linux/include -I/fcgi-lib-path/fcgi/include -L/fcgi-lib-path/fcgi/usr/lib -lfcgi
-
fcgi-lib-path- 这个指向arm linux版的fcgi库 -
gsoap-source-path- 这个指向gsoap的源码路径` - 我们编译
stdsoap2.cpp这个文件，而不去链接libsoap++.a - 定义
WITH_FASTCGI宏
2.5 配置lighttpd
如果编译的是cgi版本，直接把编译好的calcserver.cgi放到cig-bin目录下即可。
如果是fastcgi版本，需要修改lighttpd配置文件，增加如下内容（前提lighttpd已经配置好支持fastcgi了）：
fastcgi.server = (
"calcserver.cgi" =>
(( "socket" => "/tmp/fcgi.socket",
"check-local" => "disable",
"bin-path" => "/webSvr/web/cgi-bin/calcserver.cgi",
"max-procs" => 1,
))
)
