RPC Remote Call development

RPC is a remote procedure call, suitable for cluster management, the cluster node is rpcserver, and the Web server we initiated the remote call is rpcclient. Therefore is a few rpcclient (possibly one) to multiple rpcserver (cluster nodes).

The RPC development that is being described today wants to achieve the effect of executing a shell command on rpcclient (that is, the Web server) that requires the specified remote host to execute the specified command . The format of the command is as follows

Rpc_client  Address Command

Like what

192.168. 1.1 Vmstat

The result of the remote execution of this command (on Rpcserver) is expected to be directly output to the Web server (rpcclient). you can see an execution effect first.

So to do this, you need to use the RPC framework, where you choose Apache Thrift, and the C + + language, because there is no guarantee that the node is loaded with PHP or the Java environment, I want to finally get an environment-independent executable file.

Here you can see the official Apache C + + tutorials First

Https://thrift.apache.org/tutorial/cpp

Start implementing RPC below.

Install thrift environment Download related files

Yum-Y Groupinstall"Development Tools"wgethttp//ftp.gnu.org/gnu/autoconf/autoconf-2.69.tar.gzwgethttp//ftp.gnu.org/gnu/bison/bison-2.5.1.tar.gzwgethttp//ftp.gnu.org/gnu/automake/automake-1.14.tar.gzwgethttp//www.mirrorservice.org/sites/dl.sourceforge.net/pub/sourceforge/b/bo/boost/boost/1.55.0/boost_1_55_0.tar.gz git clone https://Git-wip-us.apache.org/repos/asf/thrift.git

Install in sequence

TarZXF autoconf-2.69.Tar. GZCD autoconf-2.69./configure--prefix=/usr Makesudo  Make InstallCD..TarXVF bison-2.5.1.Tar. GZCD Bison-2.5.1./configure--prefix=/usr Make Make InstallCD..TarZXF automake-1.14.Tar. GZCD Automake-1.14./configure--prefix=/usr Make Make InstallCD..TarZXF Boost_1_55_0.Tar. gz./bootstrap.SH./Configure Makesudo  Make InstallCD../Thrift./bootstrap.SHYum InstallOpenSSL Openssl-devel-y./Configure Make Make Install

Here in install thrift is Yum installed Openssl-dev, is to solve this error

After the installation is complete

Writing Thrift Files

Writing Ssan.thrift files

CPP ssanservice ssanagent {  string Run (1:string  command)}

Using Thrift to generate

CPP Ssan.thrift

Writing Rpcserver

Thrift has generated a template for the server for US

CP Ssanagent_server.skeleton. CPP Ssanserver. CPP

Previously defined interface methods are also primarily defined in this class

Modify the SSANServer.cpp file

//This autogenerated skeleton file illustrates how to build a server.//You should copy it to another filename to avoid overwriting it.#include"SSANAgent.h"#include<sstream>#include<thrift/protocol/TBinaryProtocol.h>#include<thrift/server/TSimpleServer.h>#include<thrift/transport/TServerSocket.h>#include<thrift/transport/TBufferTransports.h>using namespace:: Apache::thrift;using namespace:: Apache::thrift::p rotocol;using namespace:: Apache::thrift:: Transport;using namespace:: Apache::thrift::server;using boost::shared_ptr;using Namespace:: Ssan;using namespace Std ; class Ssanagenthandler:virtual public Ssanagentif {Public:ssanagenthandler () {//Your initialization goes here} void Run (std::string& _return, const std::string&command)      {Std::ostringstream oss; FILE* pp = Popen (Command.c_str (),"R"); if(PP) {Charbuf[4096];  while(Fgets (buf,sizeof (BUF), pp)) {OSS<<buf;      } pclose (PP); }      Else{OSS<<"error:no such command:"<<command; } _return=Oss.str (); }};intMainintargcChar**argv) {  intPort =9090; shared_ptr<SSANAgentHandler>Handler (new Ssanagenthandler ()); shared_ptr<TProcessor>Processor (new Ssanagentprocessor (handler)); shared_ptr<TServerTransport>Servertransport (New Tserversocket (port)); shared_ptr<TTransportFactory>transportfactory (New Tbufferedtransportfactory ()); shared_ptr<TProtocolFactory>protocolfactory (New Tbinaryprotocolfactory ());  Tsimpleserver Server (processor, Servertransport, Transportfactory, protocolfactory); cout<<"Start Ssan Server ..."<<Endl;  Server.serve (); cout<<" Done"<<Endl; Return0;}

Mainly in the Run method to handle the business

Generate Rpcserver

Do not use makefile first, then execute the following command to compile

g++-wall-i/usr/local/include/thrift-c ssanagent. CPP g+ +-wall-i/usr/local/include/thrift-c ssanserver. CPP g+ +-wall-i/usr/local/include/thrift-c ssan_constants. CPP g+ +-wall-i/usr/local/include/thrift-c ssan_types. CPP

Link file generation Rpcserver, note this is a dynamic link

g++-l/usr/local/lib *.o-o Ssan_server–lthrift

This error occurs after the link is run

This file already exists, but in the directory/usr/local/lib/, while the program runs and then/usr/lib under the search for dynamic library files, so create a soft link

LN -s/usr/local/lib/libthrift-1.0. 0-dev.so/usr/lib/libthrift-1.0. 0-dev.so

And then the execution started successfully.

Writing rpcclient

The rpcclient code needs to be created on its own, and the header file is copied elsewhere except the server section.

#include"SSANAgent.h"#include<ostream>#include<sstream>#include<thrift/protocol/TBinaryProtocol.h>#include<thrift/transport/TServerSocket.h>#include<thrift/transport/TBufferTransports.h>#include<thrift/transport/TSocket.h>using namespace:: Apache::thrift;using namespace:: Apache::thrift::p rotocol;using namespace:: Apache::thrift:: Transport;using namespace ssan;using namespace std;intMainintargcChar**argv) {    if(ARGC <3) {printf ("Usage:%s ip-address command ... \ n", argv[0]); Return-1; }    //working with input parametersOstringstream command,address; Address<< argv[1]; if(Argc >2) {Command<< argv[2];  for(intI=3; I < argc;i++) {Command<<" "<<Argv[i]; }    }    //To access the RPC Server execution commandBoost::shared_ptr<tsocket> socket (New Tsocket (Address.str (). C_STR (),9090)); Boost::shared_ptr<TTransport>Transport (new Tbufferedtransport (socket)); Boost::shared_ptr<TProtocol>Protocol (new Tbinaryprotocol (transport));    Ssanagentclient Client (protocol); stringoutput; Transport-open ();    Client.run (Output,command.str ()); cout<< Output <<Endl; Transport-Close (); Return0;}

Processing command line arguments here

Generate Rpcclient

Compile

g++-wall-i/usr/local/include/thrift-c ssanclient. CPP

Link

g++-l/usr/local/lib ssanclient.o ssanagent.o ssan_constants.o ssan_types.o-o ssan_client-lthrift

This part is basically not a big problem.

Writing makefile Compilation

Why is it more convenient to debug the code, or to write a makefile file. Time is limited, this is a temporary write, will continue to improve

Lib_inc     =-l/usr/local/libshare_obj   =ssan_constants.o ssan_types.o all:server clientserver: SSANAGENT.O SSANSERVER.O $ (share_obj)    g+ + $ (lib_inc) $^-o ssan_server-lthrift    @echo Ssan_server CREATED.CLIENT:SSANAGENT.O SSANCLIENT.O $ (share_obj)    g+ + $ (lib_inc) $^-o ssan_client-lthrift    @echo Ssan_client created. #default: Server Clientclean:    -RM *. o ssan_client ssan_server     done;

Perform make to see the effect

At this point, both Rpcserver and rpcclient have been generated, and the next step is to solve the problem of static compilation. Because of the limited time, this will be in the next blog in the PHP call to the RPC service package to write

RPC Remote Call development