style: code style

__crypto/simple_contract/src/credit.rs

@@ -1,6 +1,6 @@
-use std::{collections::HashMap, fs, fs::File};
-use rust_util::XResult;
+use std::collections::HashMap;
 use serde::{Serialize, Deserialize};
+use rust_util::XResult;
 use crate::tx::Transaction;
 
 #[derive(Debug, Serialize, Deserialize)]
@@ -21,7 +21,6 @@ impl CreditContract {
             admin: tx.sender.clone(),
             credit: HashMap::new(),
         };
-        save_credit_contract(&c, false)?;
         Ok(c)
     }
 
@@ -40,7 +39,6 @@ impl CreditContract {
             Some(cr) => *cr += credit,
         }
         self.issue_amount += credit;
-        save_credit_contract(self, true)?;
         Ok(())
     }
 
@@ -62,7 +60,6 @@ impl CreditContract {
                 }
             },
         }
-        save_credit_contract(self, true)?;
         Ok(())
     }
 
@@ -77,22 +74,3 @@ impl CreditContract {
         &self.credit
     }
 }
-
-
-// ========================================================================= //
-pub fn load_credit_contract(name: &str) -> XResult<CreditContract> {
-    let json = fs::read_to_string(name)?;
-    serde_json::from_str(&json).map_err(|e| e.into())
-}
-
-fn save_credit_contract(c: &CreditContract, overwrite: bool) -> XResult<()> {
-    let name = &c.name;
-    if !overwrite {
-        if let Ok(_) = File::open(name) {
-            return simple_error!("File exists: {}", name);
-        }
-    }
-    information!("Write file: {}", name);
-    fs::write(name, serde_json::to_string(c)?.as_bytes())?;
-    Ok(())
-}

__crypto/simple_contract/src/engine_plugin_credit.rs

@@ -1,6 +1,7 @@
 use serde::{Serialize, Deserialize};
 use rust_util::XResult;
-use crate::credit::{CreditContract, load_credit_contract};
+use crate::credit::CreditContract;
+use crate::credit_util::{save_credit_contract, load_credit_contract};
 use crate::tx::{Transaction, TransactionBody};
 
 #[derive(Debug, Serialize, Deserialize)]
@@ -49,17 +50,20 @@ impl ContractEngineCredit {
         match action {
             "create" => {
                 let params: CreditContractCreateParameters = serde_json::from_str(&tx_body.parameters)?;
-                CreditContract::new(tx, &params.name, params.credit_limit)?;
+                let c = CreditContract::new(tx, &params.name, params.credit_limit)?;
+                save_credit_contract(&c, false)?;
             },
             "issue" => {
                 let params: CreditContractIssueParameters = serde_json::from_str(&tx_body.parameters)?;
                 let mut c = load_credit_contract(&params.name)?;
                 c.issue(tx, &params.receiver, params.credit)?;
+                save_credit_contract(&c, true)?;
             },
             "transfer" => {
                 let params: CreditContractTransferParameters = serde_json::from_str(&tx_body.parameters)?;
                 let mut c =load_credit_contract(&params.name)?;
                 c.transfer(tx, &params.receiver, params.credit)?;
+                save_credit_contract(&c, true)?;
             },
             "query" => {
                 let params: CreditContractQueryParameters = serde_json::from_str(&tx_body.parameters)?;

__crypto/simple_contract/src/main.rs

@@ -3,6 +3,7 @@
 mod util;
 mod tx;
 mod credit;
+mod credit_util;
 mod engine;
 mod engine_plugin_credit;