update evidence contract

plugin/dapp/wasm/contracts/evidence/README.md

@@ -3,9 +3,8 @@
 ./chain33-cli send wasm create -n evidence -p evidence合约路径 -k 用户私钥
 
 # 调用合约
-# -p 0 表示传给set方法的参数
-# -v "string1","string2","string3" 表示设置三个环境变量，可以在合约内部分别调用getENV(0), getENV(1), getENV(2)读取
+# -v "string1","string2" 表示设置2个环境变量，可以在合约内部分别调用getENV(0), getENV(1)读取
 
-./chain33-cli send wasm call -n evidence -m set -p 0 -v "string1","string2","string3"  -k 用户私钥
+./chain33-cli send wasm call -n evidence -m AddStateTx -v "string1","string2"  -k 用户私钥
 ```
 

plugin/dapp/wasm/contracts/evidence/evidence.cpp

-#include "../common.h"
-#include "evidence.hpp"
-#include <string.h>
-
-int set(int64_t n) {
-	size_t l = getENVSize(n);
-	//暂不支持动态数组 char* value = new char[l]; 给定静态数组长度表示字符串长度上限
-	char value[1024] = {0};
-	getENV(n, value, l);
-	printlog(value, l);
-	return 0;
-}
\ No newline at end of file
+#include "../common.h"
+#include "evidence.hpp"
+#include <string.h>
+#define SUCC 0
+//----------------------------------------------------------------------------------------------
+//-m AddStateTx -v "TestKey001","TestValue001"
+int AddStateTx()
+{
+    if(totalENV() != 2) return -1;
+    char ChKey[128] = {0};
+    char ChValue[128] = {0};
+    //环境变量索引是从0开始的,0,1,2,3...
+    getENV(0, ChKey, getENVSize(0));
+    getENV(1, ChValue, getENVSize(1));
+    if (string_size(ChKey) == 0) return -1;
+    //1.检查存在这样的记录
+    if (getStateDBSize(ChKey, string_size(ChKey)) != 0) return -1;
+    //2.插入到链上数据库
+    setStateDB(ChKey, string_size(ChKey), ChValue, string_size(ChValue));
+    return SUCC;
+}
+//----------------------------------------------------------------------------------------------
+int DelStateTx()
+{
+    if(totalENV() !=1) return -1;
+    //1.从环境变量中获取变量值
+    char ChKey[128] = {0};
+    getENV(0, ChKey, getENVSize(0));
+    if (string_size(ChKey) == 0) return -1;
+    //2.获取对应的记录
+    if(getStateDBSize(ChKey, string_size(ChKey)) == 0) {
+        const char info[128] = "DelStateTx::getStateDBSize Not Exists\0";
+        printlog(info, string_size(info));
+        return -1;
+    }
+    //size_t getStateDB(const char* key, size_t k_len, char* value, size_t v_len);
+    char ChValue[128] = {0};
+    getStateDB(ChKey, string_size(ChKey), ChValue, sizeof(ChValue));
+    if(string_size(ChValue) == 0) {
+        //记录存在，但是之前删除过了
+        const char info[128] = "DelStateTx::getStateDB Has Been Deleted\0";
+        printlog(info, string_size(info));
+        return -1;
+    }
+    char ChNull[128] = {0};
+    setStateDB(ChKey, string_size(ChKey), ChNull, string_size(ChNull));
+    const char info[128] = "DelStateTx::Exec setStateDB Del OK\0";
+    printlog(info, string_size(info));
+    return SUCC;
+}
+//----------------------------------------------------------------------------------------------
+int ModStateTx()
+{
+    if(totalENV() != 2) return -1;
+    char ChKey[128] = {0};
+    char ChValue[128] = {0};
+    getENV(0, ChKey, getENVSize(0));
+    getENV(1, ChValue, getENVSize(1));
+    if ((string_size(ChKey) == 0) || (string_size(ChValue) == 0)) return -1;
+    //查询旧值，非空为存在旧值，为空则表示这个记录已经被删除过
+    if(getStateDBSize(ChKey, string_size(ChKey)) == 0) {
+        const char info[128] = "ModStateTx::getStateDBSize failed\0";
+        printlog(info, string_size(info));
+        return -1;
+    }
+    //在判断这条记录value是否为空，如果是则为已经被删除的记录，如此修改操作不允许
+    char value[128] = {0};
+    getStateDB(ChKey, string_size(ChKey), value, sizeof(value));
+    if(string_size(value) == 0) {
+        const char info[128] = "ModStateTx::getStateDB Has Been Deleted\0";
+        printlog(info, string_size(info));
+        return -1;
+    }
+    setStateDB(ChKey, string_size(ChKey), ChValue, string_size(ChValue));
+    const char info[128] = "ModStateTx::Exec setStateDB Update OK\0";
+    printlog(info, string_size(info));
+    return SUCC;
+}
+//----------------------------------------------------------------------------------------------
+int AddLocalTx()
+{
+    if(2 != totalENV()) return -1;
+    char ChKey[128] = {0};
+    char ChValue[128] = {0};
+    getENV(0, ChKey, getENVSize(0));
+    getENV(1, ChValue, getENVSize(1));
+    if (string_size(ChKey) == 0) return -1;
+    //1.检查存在这样的记录
+    if (getLocalDBSize(ChKey, string_size(ChKey)) != 0) return -1;
+    //2.存储本地数据
+    setLocalDB(ChKey, string_size(ChKey), ChValue, string_size(ChValue));
+    return SUCC;
+}
+//----------------------------------------------------------------------------------------------
+int DelLocalTx()
+{
+    if(totalENV() != 1) return -1;
+    char ChKey[128] = {0};
+    char szValue[128] = {0};
+    getENV(0, ChKey, getENVSize(0));
+    if (string_size(ChKey) == 0) return -1;
+    if(getLocalDBSize(ChKey, string_size(ChKey)) == 0) {
+        const char info[128] = "DelLocalTx::getLocalDBSize Length is 0\0";
+        printlog(info, string_size(info));
+        return -1;
+    }
+    char ChValue[128] = {0};
+    getLocalDB(ChKey, string_size(ChKey), ChValue, sizeof(ChValue));
+    if(string_size(ChValue) == 0) {
+        //记录存在，但是之前删除过了
+        const char info[128] = "DelLocalTx::getLocalDB Has Been Deleted\0";
+        printlog(info, string_size(info));
+        return -1;
+    }
+    char ChNull[128] = {0};
+    setLocalDB(ChKey, string_size(ChKey), ChNull, string_size(ChNull));
+    const char info[128] = "DelLocalTx::Exec Delete OK\0";
+    printlog(info, string_size(info));
+    return SUCC;
+}
+//----------------------------------------------------------------------------------------------
+int ModLocalTx()
+{
+    if(totalENV() != 2) return -1;
+    char ChKey[128] = {0};
+    char ChValue[128] = {0};
+    getENV(0, ChKey, getENVSize(0));
+    getENV(1, ChValue, getENVSize(1));
+    if (string_size(ChKey) == 0) return -1;
+    //1.检查数据记录是否存在
+    if(getLocalDBSize(ChKey, string_size(ChKey)) == 0) {
+        const char info[128] = "ModLocalTx::getLocalDBSize Not Exist\0";
+        printlog(info, string_size(info));
+        return -1;
+    }
+    char value[128] = {0};
+    getLocalDB(ChKey, string_size(ChKey), value, sizeof(value));
+    if(string_size(value) == 0) {
+        const char info[128] = "ModLocalTx::getLocalDB Has Been Deleted\0";
+        printlog(info, string_size(info));
+        return -1;
+    }
+    setLocalDB(ChKey, string_size(ChKey), ChValue, string_size(ChValue));
+    const char info[128] = "ModLocalTx::Exec setLocalDB Update OK\0";
+    printlog(info, string_size(info));
+    return SUCC;
+}
+//----------------------------------------------------------------------------------------------

plugin/dapp/wasm/contracts/evidence/evidence.hpp

-#ifdef __cplusplus //而这一部分就是告诉编译器，如果定义了__cplusplus(即如果是cpp文件，
-extern "C" { //因为cpp文件默认定义了该宏),则采用C语言方式进行编译
-#endif
-
-int set(int64_t n);
-
-#ifdef __cplusplus
-}
-#endif
\ No newline at end of file
+#ifdef __cplusplus  //而这一部分就是告诉编译器，如果定义了__cplusplus(即如果是cpp文件，
+extern "C" {        //因为cpp文件默认定义了该宏),则采用C语言方式进行编译
+#endif
+
+/**合约开发
+新建 cpp 和 hpp 文件，并导入 common.h 头文件，其中 common.h 中声明了 chain33 中的回调函数，是合约调用 chain33 系统方法的接口。
+合约中的导出方法的所有参数都只能是数字类型，且必须有一个数字类型的返回值，其中非负值表示执行成功，负值表示执行失败。 */
+//1.调用上链数据操作接口
+int AddStateTx();
+int ModStateTx();
+int DelStateTx();
+//2.调用本地数据操作接口
+int AddLocalTx();
+int ModLocalTx();
+int DelLocalTx();
+
+#ifdef __cplusplus
+}
+#endif