一个简单的RPC框架

一个 系统模型

二、数据库代码实现

1. mkdir database

cd database

vim dbInit.c

/*
 * * Database Init tool
 * */
#include <stdio.h>
#include <stdlib.h>
#include <sqlite3.h>

sqlite3 *db;
/*
 * * return 0 if database can be created  successfully else return -1
 * */
int InitDatabase() {
	int rc;
	char *sql;
	char *zErrMsg = NULL;    // error string
	rc = sqlite3_open("example.db", &db);  // open or create a database
    if(rc) {
		perror("can not create or open da660.db...!\n");
    }
	else {
		/*
		 * * create baseinfo table
		 * */
		sql = "CREATE TABLE simpleTable(key INTEGER, value INTEGER, primary key(key));";
        rc = sqlite3_exec(db, sql, 0, 0, &zErrMsg);   // create data table
        if(rc != SQLITE_OK) {
			perror("create baseinfo table failed... !\n");
			puts(zErrMsg);
		}
        if(!rc) {
			printf("Database Init Successfully!\n");
        }
	}
	/*
	 * * never to forget to close the db
	 * */
	sqlite3_close(db);  

    return rc;
}
int main() {
	if(InitDatabase()) {
		perror("Data Init failed!\n");
        exit(EXIT_FAILURE);
    }  

	return 0;
}  

3. 在当前文件夹下 autoscan

sudo mv configure.scan configure.in

vim configure.in

#                                               -*- Autoconf -*-
# Process this file with autoconf to produce a configure script.

AC_PREREQ([2.68])
#AC_INIT([FULL-PACKAGE-NAME], [VERSION], [BUG-REPORT-ADDRESS])
AC_INIT(dbInit.c)
AM_INIT_AUTOMAKE(dbInit, 1.0)
#AC_CONFIG_SRCDIR([dbInit.c])
#AC_CONFIG_HEADERS([config.h])

# Checks for programs.
AC_PROG_CC

# Checks for libraries.

# Checks for header files.
#AC_CHECK_HEADERS([stdlib.h])

# Checks for typedefs, structures, and compiler characteristics.

# Checks for library functions.

AC_OUTPUT(Makefile)

aclocal

vim Makefile.am

AUTOMAKE_OPTIONS=foreign
bin_PROGRAMS=dbInit
dbInit_SOURCES=dbInit.c

autoconf

automake --add-missing

./configure

vim Makefile

# Makefile.in generated by automake 1.11.3 from Makefile.am.
# Makefile.  Generated from Makefile.in by configure.

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# 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software
# Foundation, Inc.
# This Makefile.in is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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check-am: all-am
check: check-am
all-am: Makefile $(PROGRAMS)
installdirs:
	for dir in "$(DESTDIR)$(bindir)"; do \
	  test -z "$$dir" || $(MKDIR_P) "$$dir"; \
	done
install: install-am
install-exec: install-exec-am
install-data: install-data-am
uninstall: uninstall-am

install-am: all-am
	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am

installcheck: installcheck-am
install-strip:
	if test -z '$(STRIP)'; then \
	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
	      install; \
	else \
	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
	fi
mostlyclean-generic:

clean-generic:

distclean-generic:
	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)

maintainer-clean-generic:
	@echo "This command is intended for maintainers to use"
	@echo "it deletes files that may require special tools to rebuild."
clean: clean-am

clean-am: clean-binPROGRAMS clean-generic mostlyclean-am

distclean: distclean-am
	-rm -f $(am__CONFIG_DISTCLEAN_FILES)
	-rm -rf ./$(DEPDIR)
	-rm -f Makefile
distclean-am: clean-am distclean-compile distclean-generic \
	distclean-tags

dvi: dvi-am

dvi-am:

html: html-am

html-am:

info: info-am

info-am:

install-data-am:

install-dvi: install-dvi-am

install-dvi-am:

install-exec-am: install-binPROGRAMS

install-html: install-html-am

install-html-am:

install-info: install-info-am

install-info-am:

install-man:

install-pdf: install-pdf-am

install-pdf-am:

install-ps: install-ps-am

install-ps-am:

installcheck-am:

maintainer-clean: maintainer-clean-am
	-rm -f $(am__CONFIG_DISTCLEAN_FILES)
	-rm -rf $(top_srcdir)/autom4te.cache
	-rm -rf ./$(DEPDIR)
	-rm -f Makefile
maintainer-clean-am: distclean-am maintainer-clean-generic

mostlyclean: mostlyclean-am

mostlyclean-am: mostlyclean-compile mostlyclean-generic

pdf: pdf-am

pdf-am:

ps: ps-am

ps-am:

uninstall-am: uninstall-binPROGRAMS

.MAKE: install-am install-strip

.PHONY: CTAGS GTAGS all all-am am--refresh check check-am clean \
	clean-binPROGRAMS clean-generic ctags dist dist-all dist-bzip2 \
	dist-gzip dist-lzip dist-lzma dist-shar dist-tarZ dist-xz \
	dist-zip distcheck distclean distclean-compile \
	distclean-generic distclean-tags distcleancheck distdir \
	distuninstallcheck dvi dvi-am html html-am info info-am \
	install install-am install-binPROGRAMS install-data \
	install-data-am install-dvi install-dvi-am install-exec \
	install-exec-am install-html install-html-am install-info \
	install-info-am install-man install-pdf install-pdf-am \
	install-ps install-ps-am install-strip installcheck \
	installcheck-am installdirs maintainer-clean \
	maintainer-clean-generic mostlyclean mostlyclean-compile \
	mostlyclean-generic pdf pdf-am ps ps-am tags uninstall \
	uninstall-am uninstall-binPROGRAMS

# Tell versions [3.59,3.63) of GNU make to not export all variables.
# Otherwise a system limit (for SysV at least) may be exceeded.
.NOEXPORT:

在改动Makefile时，最重要的是在LIBS中添加 -lpthread -lsqlite3

make

生成可运行文件 dbInit，用于初始化数据库

三 远程调用实现

mkdir rpc

cd rpc

vim rpc.x

struct record {
	int key;
	int value;
};
program SEVERPROG {
   version VERSION {
     int QUERY(int) = 1;
	 int INSERT(record) = 2;
	 int DELETE(int) = 3;
   } = 1;
} = 87654321;

rpcgen -C rpc.x

rpcgen -Ss -o rpc_srv_func.c rpc.x

rpcgen -Sc -o rpc_cln_func.c rpc.x

rpcgen -Sm rpc.x  > Makefile

vim rpc_srv_func.c

/*
 * This is sample code generated by rpcgen.
 * These are only templates and you can use them
 * as a guideline for developing your own functions.
 */

#include <sqlite3.h>
#include "rpc.h"
#define SIZE 128
sqlite3 *db = NULL;
int *
query_1_svc(int *argp, struct svc_req *rqstp)
{
	static int  result;
	/*
	 * insert server code here
	 */
	int rc;
    int nRow, nColumn;
    int row, col;
    int index;
    int key = *argp, value;
    char *zErrMsg = NULL;
    char **dbResult;			 // point to two dimension table
    char select_sql[SIZE];
    char *domain;				// the attribute name  of query table
    /*
     * to open database
     * */
    rc = sqlite3_open("example.db", &db);
    if(rc != SQLITE_OK) {
        perror("example.db open failed...!\n");
        rc = -1;
    }
    else {
        /*
         * to select data record
         * */
        memset(select_sql, '\0', sizeof(select_sql));
        sprintf(select_sql, "select * from simpleTable where key = %d", key);
        /*
         * to get the two dimension table, nRow means rows and nColumn means cols
         * */
        rc = sqlite3_get_table(db, select_sql, &dbResult, &nRow, &nColumn, &zErrMsg);
        if(rc != SQLITE_OK) {
            perror("database query failed!\n");
            rc = -1;
        }
        else {
            /*
             * query statement
             * */
            index = nColumn;   // the first value should start from nColum
            for(row = 0;row < nRow;row++) {
                printf("-------the %d record----------\n", row + 1);
                for(col = 0;col < nColumn;col++) {
                    domain = dbResult[col];
                    value = atoi(dbResult[index]);
                    printf("\t%-5s:", domain);
                    printf("%d\n", value);
                    index++;
                }
            }
        }
    }
    sqlite3_free_table(dbResult);  // never to forget to free the query table
    sqlite3_close(db);
	result = rc;

	return &result;
}

int *
insert_1_svc(record *argp, struct svc_req *rqstp)
{
	static int  result;
	/*
	 * insert server code here
	 */
    int rc;
    char *zErrMsg = NULL;
    char insert_sql[SIZE];
	int key, value;
	key = argp->key;
	value = argp->value;
    /*
     * to open da660.db
     * */
    rc = sqlite3_open("example.db", &db);
    if(rc) {
        perror("example.db open failed...!\n");
        rc = -1;
    }
    else {
        /*
         * insert data record
         * */
        memset(insert_sql, '\0', sizeof(insert_sql));
        sprintf(insert_sql, "INSERT INTO simpleTable(key, value) VALUES(%u, %u)", key, value);
        rc = sqlite3_exec(db, insert_sql, 0, 0, &zErrMsg); // execute sql statement and insert data record
        if(rc == SQLITE_OK) {
            printf("insert one data record success...!\n");
        }
        else {
            perror("insert one data record failure...!\n");
            rc = -1;
        }
        sqlite3_close(db);  // never to forget to close the db
    }
    result = rc;  

	return &result;
}

int *
delete_1_svc(int *argp, struct svc_req *rqstp)
{
	static int  result;
	/*
	 * insert server code here
	 */
    int rc;
	int key = *argp;
    char *zErrMsg = NULL;
    char delete_sql[SIZE];
    /*
     * to open da660.db
     * */
    rc = sqlite3_open("example.db", &db);
    if(rc) {
        perror("example.db open failed...!\n");
        rc = -1;
    }
    else {
		sprintf(delete_sql, "delete from baseinfo where port = %d", key);
		rc = sqlite3_exec(db, delete_sql, 0, 0, &zErrMsg); // execute sql statement and delete data record
		if(rc == SQLITE_OK) {
			printf("delete one data record success...!\n");
        }
		else {
			perror("delete one data record failure...!\n");
			rc = -1;
        }
    }
    sqlite3_close(db);  // never to forget to close the db
	result = rc;  

	return &result;
}

vim rpc_cln_func.c

/*
 * This is sample code generated by rpcgen.
 * These are only templates and you can use them
 * as a guideline for developing your own functions.
 */

#include "rpc.h"

void
severprog_1(char *host)
{
	CLIENT *clnt;
	int  *result_1;
	int  query_1_arg;
	int  *result_2;
	record  insert_1_arg;
	int  *result_3;
	int  delete_1_arg;

#ifndef	DEBUG
	clnt = clnt_create (host, SEVERPROG, VERSION, "udp");
	if (clnt == NULL) {
		clnt_pcreateerror (host);
		exit (1);
	}
#endif	/* DEBUG */

/*	result_1 = query_1(&query_1_arg, clnt);
	if (result_1 == (int *) NULL) {
		clnt_perror (clnt, "call failed");
	}
	result_2 = insert_1(&insert_1_arg, clnt);
	if (result_2 == (int *) NULL) {
		clnt_perror (clnt, "call failed");
	}
	result_3 = delete_1(&delete_1_arg, clnt);
	if (result_3 == (int *) NULL) {
		clnt_perror (clnt, "call failed");
	}
	*/
	int choice;
	int key, value;
	record M;
	printf("\t%10s", "Welcome to System...!\n");
    printf("\t%10s", "0 -- query data record from simpleTable...\n");
    printf("\t%10s", "1 -- insert data record to simpleTable...\n");
    printf("\t%10s", "2 -- delete data record from simpleTable...\n");
    printf("\t%10s", "3 -- quit the system...\n");
	printf("please make your choice:");
    if(scanf("%d", &choice) != 1) {
		perror("input data error, system crash...!\n");
		exit(EXIT_FAILURE);
    }
	if(!(choice <= 3 && choice >= 0)) {
		perror("Sorry, You have made wrong choice...!\n");
		exit(EXIT_FAILURE);
    }
	switch(choice) {
		case 0:
			printf("please input key:");
			if(scanf("%d", &key) != 1) {
				perror("input data error, system crash...!\n");
				exit(EXIT_FAILURE);
            }
			query_1_arg = key;
			result_1 = query_1(&query_1_arg, clnt);
			if (result_1 == (int *) NULL) {
				clnt_perror (clnt, "data query failed...!\n");
			}
			break;
		case 1:
			printf("please input key:");
			if(scanf("%d", &key) != 1) {
				perror("input data error, system crash...!\n");
				exit(EXIT_FAILURE);
            }
			printf("please input value:");
			if(scanf("%d", &value) != 1) {
				perror("input data error, system crash...!\n");
				exit(EXIT_FAILURE);
            }
			M.key = key;
			M.value = value;
			insert_1_arg = M;
			result_2 = insert_1(&insert_1_arg, clnt);
			if (result_2 == (int *) NULL) {
				clnt_perror (clnt, "data insert failed...!\n");
			}
			else printf("data insert successfully...!\n");
			break;
		case 2:
			printf("please input key:");
			if(scanf("%d", &key) != 1) {
				perror("input data error, system crash...!\n");
				exit(EXIT_FAILURE);
			}
			delete_1_arg = key;
			result_3 = delete_1(&delete_1_arg, clnt);
			if (result_3 == (int *) NULL) {
				clnt_perror (clnt, "datat delete failed...!\n");
			}
			else printf("data delete successfully...!\n");
			break;
		case 3:
			goto exit;
			break;
	}
exit:
#ifndef	DEBUG
	clnt_destroy (clnt);
#endif	 /* DEBUG */
}

int
main (int argc, char *argv[])
{
	char *host;

	if (argc < 2) {
		printf ("usage: %s server_host\n", argv[0]);
		exit (1);
	}
	host = argv[1];
	severprog_1 (host);
exit (0);
}

vim Makefile

# This is a template Makefile generated by rpcgen

# Parameters

CLIENT = rpc_client
SERVER = rpc_server

SOURCES_CLNT.c =
SOURCES_CLNT.h =
SOURCES_SVC.c =
SOURCES_SVC.h =
SOURCES.x = rpc.x

TARGETS_SVC.c = rpc_svc.c   rpc_xdr.c 			rpc_srv_func.c
TARGETS_CLNT.c = rpc_clnt.c   rpc_xdr.c 		rpc_cln_func.c
TARGETS = rpc.h rpc_xdr.c rpc_clnt.c rpc_svc.c    

OBJECTS_CLNT = $(SOURCES_CLNT.c:%.c=%.o) $(TARGETS_CLNT.c:%.c=%.o)
OBJECTS_SVC = $(SOURCES_SVC.c:%.c=%.o) $(TARGETS_SVC.c:%.c=%.o)
# Compiler flags 

CFLAGS += -g
LDLIBS += -lnsl -lpthread -lsqlite3
RPCGENFLAGS = 

# Targets 

all : $(CLIENT) $(SERVER)

$(TARGETS) : $(SOURCES.x)
	rpcgen $(RPCGENFLAGS) $(SOURCES.x)

$(OBJECTS_CLNT) : $(SOURCES_CLNT.c) $(SOURCES_CLNT.h) $(TARGETS_CLNT.c) 

$(OBJECTS_SVC) : $(SOURCES_SVC.c) $(SOURCES_SVC.h) $(TARGETS_SVC.c) 

$(CLIENT) : $(OBJECTS_CLNT)
	$(LINK.c) -o $(CLIENT) $(OBJECTS_CLNT) $(LDLIBS) 

$(SERVER) : $(OBJECTS_SVC)
	$(LINK.c) -o $(SERVER) $(OBJECTS_SVC) $(LDLIBS)

 clean:
	 $(RM) core $(TARGETS) $(OBJECTS_CLNT) $(OBJECTS_SVC) $(CLIENT) $(SERVER)

make

生成rpc_server 和rpc_client两个可运行文件

四 測试

在server端输入 sudo ./rpc_server

在client端输入 ./rpc_client 127.0.0.1

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