going somewhere.

migrations/create_tables_001.sql

@@ -9,21 +9,35 @@ CREATE TABLE IF NOT EXISTS users
 CREATE TABLE IF NOT EXISTS security_types
 (
     name TEXT PRIMARY KEY
-) STRICT ;
+) STRICT;
 
 INSERT INTO security_types(name)
-VALUES ('currency'), ('bond');
+VALUES ('currency'),
+       ('bond');
 
 CREATE TABLE IF NOT EXISTS securities
 (
-    id             INTEGER PRIMARY KEY AUTOINCREMENT,
-    security_type  TEXT NOT NULL,
-    name           TEXT NOT NULL UNIQUE,
-    symbol         TEXT NOT NULL UNIQUE,
-    creation_time  DATETIME DEFAULT CURRENT_TIMESTAMP,
+    id            INTEGER PRIMARY KEY AUTOINCREMENT,
+    security_type TEXT NOT NULL,
+    name          TEXT NOT NULL UNIQUE,
+    symbol        TEXT NOT NULL UNIQUE,
+    creation_time DATETIME DEFAULT CURRENT_TIMESTAMP,
     FOREIGN KEY (security_type) REFERENCES security_types (name)
 );
 
+
+CREATE TABLE IF NOT EXISTS security_permissions
+(
+    id            INTEGER PRIMARY KEY AUTOINCREMENT,
+    security_id   INTEGER NOT NULL,
+    user_id       INTEGER NOT NULL,
+    creation_time DATETIME DEFAULT CURRENT_TIMESTAMP,
+
+    FOREIGN KEY (security_id) REFERENCES securities (id),
+    FOREIGN KEY (user_id) REFERENCES users (id)
+
+);
+
 CREATE TABLE IF NOT EXISTS accounts
 (
     id            INTEGER PRIMARY KEY AUTOINCREMENT,
@@ -37,7 +51,19 @@ CREATE TABLE IF NOT EXISTS accounts
     FOREIGN KEY (owner) REFERENCES users (id)
 );
 
-CREATE TABLE IF NOT EXISTS account_values
+
+CREATE TABLE IF NOT EXISTS cashed_cheques
 (
-    id INTEGER PRIMARY KEY AUTOINCREMENT
-) STRICT;
+    id                  INTEGER PRIMARY KEY AUTOINCREMENT,
+    drawer_user_id      INTEGER NOT NULL,
+    drawer_account_id   INTEGER NOT NULL,
+    cheque_number       INTEGER NOT NULL,
+    amount              INTEGER NOT NULL,
+    underlying_security INTEGER NOT NULL,
+    creation_time       DATETIME DEFAULT CURRENT_TIMESTAMP,
+
+
+    FOREIGN KEY (underlying_security) REFERENCES securities (id),
+    FOREIGN KEY (drawer_user_id) REFERENCES users (id),
+    FOREIGN KEY (drawer_account_id) REFERENCES accounts (id)
+);

src/db/README.md

@@ -0,0 +1,11 @@
+# DB schema
+
+```mermaid
+erDiagram
+    users ||--o{ accounts : owner
+    users ||--o{ securities : owner
+    security_types ||--o{ securities: s
+    securities ||--o{ accounts: ps
+    users ||--o{ cheques: ps
+    securities ||--o{ cheques: ps
+```

src/db/_accounts.rs

@@ -11,8 +11,8 @@ pub struct Account {
 }
 
 impl Account {
-    pub fn from_row(row: &Row) -> Result<Account>{
-        return Ok(Account{
+    pub fn from_row(row: &Row) -> Result<Account> {
+        return Ok(Account {
             id: row.get("acc_id")?,
             amount: row.get("acc_amount")?,
             timestamp: row.get("acc_timestamp")?,
@@ -41,7 +41,7 @@ pub fn list_accounts<'a>(conn: &Connection) -> Result<Vec<Account>> {
     return Ok(ret);
 }
 
-pub fn get_account_by_id(tx: &Transaction, id: u32) -> Result<Account>{
+pub fn get_account_by_id(tx: &Transaction, id: u32) -> Result<Account> {
     let q = "SELECT acc.id AS acc_id,
                           acc.amount AS acc_amount,
                           UNIXEPOCH(acc.timestamp) AS acc_timestamp,
@@ -55,7 +55,7 @@ pub fn get_account_by_id(tx: &Transaction, id: u32) -> Result<Account>{
     return tx.query_row(q, params![id], Account::from_row);
 }
 
-pub fn create_account(tx: &Transaction, sec: &Security, user: &User) -> Result<Account>{
+pub fn create_account(tx: &Transaction, sec: &Security, user: &User) -> Result<Account> {
     let q = "INSERT INTO accounts(security, owner, amount, timestamp)
                    VALUES (?1, ?2, 0, CURRENT_TIMESTAMP)";
     tx.execute(q, (sec.id, user.id))?;
@@ -64,38 +64,27 @@ pub fn create_account(tx: &Transaction, sec: &Security, user: &User) -> Result<A
 
 #[cfg(test)]
 mod test {
-    use rusqlite::{Connection};
-    use crate::db::_users;
+    use rusqlite::Connection;
+
+    use crate::db::_test_utils::{setup_users_and_securities};
     use crate::db::_securities;
+    use crate::db::_users;
     use crate::migration;
 
     use super::*;
 
-    fn setup_users(tx: &Transaction) -> Result<Vec<User>> {
-        let user_1 = _users::create_user(tx, &"bernard".to_string(), &"123".to_string())?;
-        let user_2 = _users::create_user(tx, &"sam".to_string(), &"abc".to_string())?;
-        return Ok(vec![user_1, user_2]);
-    }
-
-    fn setup_securities(tx: &Transaction) -> Result<Vec<Security>> {
-        let sec_1 = _securities::create_security(tx, &_securities::test_util::mock_currency_1())?;
-        let sec_2 = _securities::create_security(tx, &_securities::test_util::mock_currency_2())?;
-        return Ok(vec![sec_1, sec_2]);
-    }
-
     fn setup() -> (Connection, Vec<User>, Vec<Security>) {
         let mut conn = Connection::open_in_memory().unwrap();
         migration::apply_migrations(&mut conn).unwrap();
 
         let tx = conn.transaction().unwrap();
-        let users = setup_users(&tx).unwrap();
-        let securities = setup_securities(&tx).unwrap();
+        let (users, securities) = setup_users_and_securities(&tx).unwrap();
 
         tx.commit().unwrap();
         return (conn, users, securities);
     }
 
-    fn create_all_accounts(tx: & Transaction, users: & Vec<User>, secs: & Vec<Security>) -> Result<()>{
+    fn create_all_accounts(tx: &Transaction, users: &Vec<User>, secs: &Vec<Security>) -> Result<()> {
         for sec in secs.iter() {
             for user in users.iter() {
                 create_account(&tx, sec, user)?;
@@ -105,12 +94,12 @@ mod test {
     }
 
     #[test]
-    fn test_happy_path() -> Result<()>{
+    fn test_happy_path() -> Result<()> {
         let (mut conn, users, secs) = setup();
         let tx = conn.transaction()?;
-        create_all_accounts(& tx, &users, &secs)?;
+        create_all_accounts(&tx, &users, &secs)?;
         tx.commit()?;
-        let accs = list_accounts(& conn)?;
+        let accs = list_accounts(&conn)?;
         assert_eq!(4, accs.len());
         assert_eq!(1, accs.get(0).unwrap().id);
         assert_eq!(4, accs.get(3).unwrap().id);
@@ -118,10 +107,10 @@ mod test {
     }
 
     #[test]
-    fn test_happy_path_no_commit() -> Result<()>{
+    fn test_happy_path_no_commit() -> Result<()> {
         let (mut conn, users, secs) = setup();
-        create_all_accounts(& conn.transaction()?, &users, &secs)?;
-        let accs = list_accounts(& conn)?;
+        create_all_accounts(&conn.transaction()?, &users, &secs)?;
+        let accs = list_accounts(&conn)?;
         assert_eq!(0, accs.len());
         return Ok(());
     }

src/db/_cheques.rs

@@ -1,21 +1,39 @@
-use crate::db::_external_id::ExternalId;
+use rusqlite::{Result, Transaction};
+
+use crate::db::_external_id::{AccountId, SecurityId};
 
 pub struct SecurityEmitterCheque {
-    drawer_user_id: ExternalId,
-    security_id: ExternalId,
-    cheque_number: u32,
-    amount: u32,
+    pub drawer_user_id: AccountId,
+    pub security_id: SecurityId,
+    pub payee_user_id: AccountId,
+    pub cheque_number: u32,
+    pub amount: u32,
 }
 
-impl Cheque {
-    pub fn is_valid(self: &Cheque) -> bool {
-        return true;
+impl SecurityEmitterCheque {
+    fn new_safe(tx: &Transaction,
+                drawer_user_id: AccountId,
+                security_id: SecurityId,
+                payee_user_id: AccountId,
+                amount: u32,
+                id_generator: fn() -> u32) -> Result<SecurityEmitterCheque> {
+        Ok(SecurityEmitterCheque {
+            drawer_user_id,
+            security_id,
+            payee_user_id,
+            cheque_number: id_generator(),
+            amount,
+        })
     }
 
-
-    pub fn cash_cheque(&self){
-
+    pub fn assert_valid(&self, tx: &Transaction) -> Result<()> {
+        Ok(())
     }
-
-
 }
+
+pub mod test {
+    use super::*;
+
+    #[test]
+    fn test_foo() {}
+}

src/db/_external_id.rs

@@ -2,36 +2,34 @@ use std::io::Read;
 
 use regex::{Captures, Regex};
 
-
 #[derive(PartialEq, Debug)]
 struct SafeId {
     encrypted_id: [u8; 4],
     signature: [u8; 4],
 }
 
-#[derive(PartialEq, Debug)]
-pub enum ExternalId {
-    AccountId(SafeId),
-    UserId(SafeId),
-    SecurityId(SafeId),
+
+pub trait Id {
+    type Output;
+    fn from_regex_captures(caps: &Captures) -> Option<Self::Output>;
+    fn from_string(s: &String) -> Option<Self::Output>;
+    fn from_id(id: u32) -> Self::Output;
+    fn get_id(&self) -> u32;
 }
 
+
 impl ToString for SafeId {
     fn to_string(&self) -> String {
-        format!("{}-{}", hex::encode(self.encrypted_id), hex::encode(self.signature))
+        format!("{}-{}",
+                hex::encode(self.encrypted_id),
+                hex::encode(self.signature))
     }
 }
 
-fn deserialize_str(s: &str) -> Option<[u8; 4]> {
-    let mut encrypted_id_bytes = [0u8; 4];
-    let r = hex::decode_to_slice(s, &mut encrypted_id_bytes as &mut [u8]);
-    return match r {
-        Ok(_) => Some(encrypted_id_bytes),
-        Err(_) => None
-    };
-}
 
-impl SafeId {
+impl Id for SafeId {
+    type Output = Self;
+
     fn from_regex_captures(caps: &Captures) -> Option<SafeId> {
         let encrypted_id = caps.name("id")?;
         let signature = caps.name("sign")?;
@@ -42,13 +40,13 @@ impl SafeId {
         })
     }
 
-    pub fn from_string(s: &String) -> Option<SafeId> {
+    fn from_string(s: &String) -> Option<SafeId> {
         let external_id_pattern = Regex::new(r"^(?P<id>\w+)-(?P<sign>\w+)$").unwrap();
         let caps = external_id_pattern.captures(&s)?;
         return Self::from_regex_captures(&caps);
     }
 
-    pub fn from_id(id: u32) -> SafeId {
+    fn from_id(id: u32) -> SafeId {
         let bytes = u32::to_be_bytes(id);
         SafeId {
             encrypted_id: bytes,
@@ -56,18 +54,87 @@ impl SafeId {
         }
     }
 
-    pub fn get_id(&self) -> u32 {
+    fn get_id(&self) -> u32 {
         return u32::from_be_bytes(self.encrypted_id);
     }
 }
 
 
+
+macro_rules! impl_ids {
+    ($T:ident, $prefix:literal) => {
+
+        impl ToString for $T {
+            fn to_string(&self) -> String {
+                format!("{}-{}", $prefix, self.0.to_string())
+            }
+        }
+
+        impl Id for $T {
+            type Output = $T;
+
+            fn from_regex_captures(caps: &Captures) -> Option<$T> {
+                let type_ = caps.name("type")?;
+                if(type_.as_str() != $prefix){
+                    return None;
+                }
+                SafeId::from_regex_captures(caps).map(|x| $T(x))
+            }
+
+            fn from_string(s: &String) -> Option<$T> {
+                let external_id_pattern = Regex::new(r"^(?P<type>\w)-(?P<id>\w+)-(?P<sign>\w+)$").unwrap();
+                let caps = external_id_pattern.captures(&s)?;
+                Self::from_regex_captures(& caps)
+            }
+
+            fn from_id(id: u32) -> $T {
+                $T(SafeId::from_id(id))
+            }
+
+            fn get_id(&self) -> u32 {
+                self.0.get_id()
+            }
+        }
+    }
+}
+
+#[derive(PartialEq, Debug)]
+pub struct AccountId(SafeId);
+
+#[derive(PartialEq, Debug)]
+pub struct UserId(SafeId);
+
+#[derive(PartialEq, Debug)]
+pub struct SecurityId(SafeId);
+
+impl_ids!(AccountId, "a");
+impl_ids!(UserId, "u");
+impl_ids!(SecurityId, "s");
+
+#[derive(PartialEq, Debug)]
+pub enum ExternalId {
+    AccountId(AccountId),
+    UserId(UserId),
+    SecurityId(SecurityId),
+}
+
+
+fn deserialize_str(s: &str) -> Option<[u8; 4]> {
+    let mut encrypted_id_bytes = [0u8; 4];
+    let r = hex::decode_to_slice(s, &mut encrypted_id_bytes as &mut [u8]);
+    return match r {
+        Ok(_) => Some(encrypted_id_bytes),
+        Err(_) => None
+    };
+}
+
+
 impl ToString for ExternalId {
     fn to_string(&self) -> String {
         match self {
-            ExternalId::UserId(sid) => format!("a-{}", sid.to_string()),
-            ExternalId::AccountId(sid) => format!("u-{}", sid.to_string()),
-            ExternalId::SecurityId(sid) => format!("s-{}", sid.to_string()),
+            ExternalId::UserId(sid) => sid.to_string(),
+            ExternalId::AccountId(sid) => sid.to_string(),
+            ExternalId::SecurityId(sid) => sid.to_string(),
         }
     }
 }
@@ -79,9 +146,9 @@ impl ExternalId {
         let caps = pattern.captures(&s)?;
 
         match caps.name("type")?.as_str() {
-            "a" => Some(ExternalId::AccountId(SafeId::from_regex_captures(&caps)?)),
-            "u" => Some(ExternalId::UserId(SafeId::from_regex_captures(&caps)?)),
-            "s" => Some(ExternalId::SecurityId(SafeId::from_regex_captures(&caps)?)),
+            "a" => Some(ExternalId::AccountId(AccountId::from_regex_captures(&caps)?)),
+            "u" => Some(ExternalId::UserId(UserId::from_regex_captures(&caps)?)),
+            "s" => Some(ExternalId::SecurityId(SecurityId::from_regex_captures(&caps)?)),
             _ => None
         }
     }
@@ -96,11 +163,19 @@ impl ExternalId {
 }
 
 
-pub mod test_util {
+pub mod test {
     use std::any::Any;
 
     use super::*;
 
+    #[test]
+    fn test_id_macro() {
+        let id = SecurityId::from_id(33);
+        assert_eq!(id.to_string(), "s-00000021-00000021".to_string());
+        assert!(SecurityId::from_string(&"s-00000021-00000021".to_string()).is_some());
+        assert!(SecurityId::from_string(&"u-00000021-00000021".to_string()).is_none());
+        assert!(SecurityId::from_string(&"00000021-00000021".to_string()).is_none());
+    }
 
     #[test]
     fn safe_id_happy_path_1() {
@@ -135,17 +210,20 @@ pub mod test_util {
             ExternalId::UserId(_) => true,
             _ => false
         });
+        assert_eq!(eid.to_string(), "u-01020304-0708090a".to_string());
 
         let eid = ExternalId::from_string(&"a-01020304-0708090a".to_string()).unwrap();
         assert!(match eid {
             ExternalId::AccountId(_) => true,
             _ => false
         });
+        assert_eq!(eid.to_string(), "a-01020304-0708090a".to_string());
 
         let eid = ExternalId::from_string(&"s-01020304-0708090a".to_string()).unwrap();
         assert!(match eid {
             ExternalId::SecurityId(_) => true,
             _ => false
         });
+        assert_eq!(eid.to_string(), "s-01020304-0708090a".to_string());
     }
 }

src/db/_securities.rs

@@ -1,5 +1,6 @@
-use rusqlite::{Connection, params, Result, Row, ToSql, Transaction};
+use rusqlite::{Connection, OptionalExtension, params, Result, Row, ToSql, Transaction};
 use serde::Serialize;
+use crate::db::users::User;
 
 
 #[derive(Debug, Serialize, PartialEq)]
@@ -48,31 +49,51 @@ impl Security {
 }
 
 pub struct NewSecurity {
-    security_type: SecurityType,
-    symbol: String,
-    name: String,
+    pub security_type: SecurityType,
+    pub symbol: String,
+    pub name: String,
 }
 
-pub fn create_security(tx: &Transaction, sec: &NewSecurity) -> Result<Security> {
+pub fn create_security(tx: &Transaction,
+                       sec: &NewSecurity,
+                       owner: &User) -> Result<Security> {
     let q = "INSERT INTO
                      securities(name, symbol, security_type)
                    VALUES(?1, ?2, ?3)";
     let params = (&sec.name, &sec.symbol, &sec.security_type);
     tx.execute(q, params)?;
-    return get_security_by_id(tx, tx.last_insert_rowid() as i32);
+    let new_sec_id = tx.last_insert_rowid() as i32;
+
+    let q = "INSERT INTO
+                      security_permissions(security_id, user_id)
+                      VALUES(?1, ?2)";
+    tx.execute(q, params![new_sec_id, owner.id])?;
+
+    return get_security_by_id(tx, new_sec_id);
+}
+
+pub fn is_owner(tx: &Transaction, sec: &Security, user: &User) -> Result<bool> {
+    let q = "SELECT id
+                  FROM security_permissions
+                  WHERE security_id = ?1 AND user_id = ?2
+                  LIMIT 1";
+    let ret: Option<u32> = tx.query_row(q,
+                                        params![sec.id, user.id],
+                                        |r| r.get(0)).optional()?;
+    return Ok(ret.is_some());
 }
 
 pub fn get_security_by_id(tx: &Transaction, id: i32) -> Result<Security> {
     let q = "SELECT id AS sec_id, security_type AS sec_security_type, symbol AS sec_symbol
-                   FROM securities
-                   WHERE id = ?1";
+                  FROM securities
+                  WHERE id = ?1";
     tx.query_row(q, params![id], Security::from_row)
 }
 
 pub fn list_securities(conn: &Connection) -> Result<Vec<Security>> {
     let q = "SELECT id AS sec_id, security_type AS sec_security_type, symbol AS sec_symbol
-                   FROM securities
-                   ORDER BY id ASC";
+                  FROM securities
+                  ORDER BY id ASC";
     let mut stmt = conn.prepare(q)?;
 
     let ret: Vec<Security> = stmt
@@ -83,41 +104,27 @@ pub fn list_securities(conn: &Connection) -> Result<Vec<Security>> {
     return Ok(ret);
 }
 
-pub mod test_util {
-    use super::*;
-    pub fn mock_currency_1() -> NewSecurity {
-        return NewSecurity {
-            security_type: SecurityType::Currency,
-            symbol: "P".to_string(),
-            name: "piastre".to_string(),
-        };
-    }
-
-    pub fn mock_currency_2() -> NewSecurity {
-        return NewSecurity {
-            security_type: SecurityType::Bond,
-            symbol: "B".to_string(),
-            name: "bong".to_string(),
-        };
-    }
-}
 
 #[cfg(test)]
 mod test {
     use rusqlite::{Connection, params};
     use super::*;
-    use super::test_util::*;
+    use crate::db::_test_utils::*;
     use crate::migration;
 
-    fn setup() -> Connection {
+    fn setup() -> (Connection, Vec<User>) {
         let mut conn = Connection::open_in_memory().unwrap();
         migration::apply_migrations(&mut conn).unwrap();
-        return conn;
+        let tx = conn.transaction().unwrap();
+        let users = setup_users(&tx).unwrap();
+        tx.commit().unwrap();
+
+        return (conn, users);
     }
 
     #[test]
     fn test_security_types() -> Result<(), rusqlite::Error> {
-        let conn = setup();
+        let (mut conn, users) = setup();
         let q = "CREATE TABLE test_security_types(
             name TEXT,
             FOREIGN KEY (name) REFERENCES security_types (name)
@@ -133,21 +140,28 @@ mod test {
 
     #[test]
     fn test_create_security() -> Result<(), rusqlite::Error> {
-        let mut conn = setup();
+        let (mut conn, users) = setup();
+        let owner = users.get(0).unwrap();
+        let not_owner = users.get(1).unwrap();
         let sec = mock_currency_1();
         let tx = conn.transaction()?;
-        create_security(&tx, &sec)?;
-        return tx.commit();
+        let sec = create_security(&tx, &sec, &owner)?;
+
+        assert!(is_owner(&tx, &sec, &owner)?);
+        assert!(!is_owner(&tx, &sec, &not_owner)?);
+
+        tx.commit()
     }
 
     #[test]
     fn test_list_security() -> Result<(), rusqlite::Error> {
-        let mut conn = setup();
+        let (mut conn, users) = setup();
+        let user = users.get(0).unwrap();
         assert_eq!(0, list_securities(&conn)?.len());
 
         let sec = mock_currency_1();
         let tx = conn.transaction()?;
-        create_security(&tx, &sec)?;
+        create_security(&tx, &sec, &user)?;
         tx.commit()?;
         let ret = list_securities(&conn)?;
         let expt = Security {
@@ -166,7 +180,7 @@ mod test {
             symbol: "B".to_string(),
         };
         let tx = conn.transaction()?;
-        create_security(&tx, &sec)?;
+        create_security(&tx, &sec, &user)?;
         tx.commit()?;
         let ret = list_securities(&conn)?;
         assert_eq!(2, ret.len());

src/db/_test_utils.rs

@@ -0,0 +1,49 @@
+use rusqlite::{Result, Transaction};
+
+use crate::db::{_securities, _users};
+use crate::db::_accounts::create_account;
+use crate::db::_securities::{NewSecurity, Security, SecurityType};
+use crate::db::_users::User;
+use crate::db::accounts::Account;
+
+pub fn mock_currency_1() -> NewSecurity {
+    return NewSecurity {
+        security_type: SecurityType::Currency,
+        symbol: "P".to_string(),
+        name: "piastre".to_string(),
+    };
+}
+
+pub fn mock_currency_2() -> NewSecurity {
+    return NewSecurity {
+        security_type: SecurityType::Bond,
+        symbol: "B".to_string(),
+        name: "bong".to_string(),
+    };
+}
+
+pub fn setup_users(tx: &Transaction) -> Result<Vec<User>> {
+    let user_1 = _users::create_user(tx, &"bernard".to_string(), &"123".to_string())?;
+    let user_2 = _users::create_user(tx, &"sam".to_string(), &"abc".to_string())?;
+    return Ok(vec![user_1, user_2]);
+}
+
+pub fn setup_securities(tx: &Transaction, owner: &User) -> Result<Vec<Security>> {
+    let sec_1 = _securities::create_security(tx, &mock_currency_1(), owner)?;
+    let sec_2 = _securities::create_security(tx, &mock_currency_2(), owner)?;
+    return Ok(vec![sec_1, sec_2]);
+}
+
+pub fn setup_users_and_securities(tx: &Transaction) ->  Result<(Vec<User>, Vec<Security>)>{
+    let users = setup_users(tx)?;
+    let securities = setup_securities(tx, users.get(0).unwrap())?;
+    Ok((users, securities))
+}
+
+pub fn setup_basic_environment(tx: &Transaction) -> Result<(Vec<User>, Vec<Security>, Vec<Account>)> {
+    let (users, securities) = setup_users_and_securities(tx)?;
+
+    let acc1 = create_account(tx, securities.get(0).unwrap(), users.get(0).unwrap())?;
+    let acc2 = create_account(tx, securities.get(1).unwrap(), users.get(1).unwrap())?;
+    Ok((users, securities, vec![acc1, acc2]))
+}

src/db/mod.rs

@@ -3,9 +3,10 @@ mod _securities;
 mod _accounts;
 mod _cheques;
 mod _external_id;
+mod _test_utils;
 
-pub mod securities{
-    pub use super::_securities::{list_securities, get_security_by_id, Security};
+pub mod securities {
+    pub use super::_securities::{get_security_by_id, list_securities, Security};
 }
 
 pub mod users {
@@ -13,9 +14,15 @@ pub mod users {
 }
 
 pub mod accounts {
-    pub use super::_accounts::{get_account_by_id, list_accounts, create_account, Account};
+    pub use super::_accounts::{Account, create_account, get_account_by_id, list_accounts};
 }
 
 pub mod cheques {
-    pub use super::_cheques::{Cheque};
+    pub use super::_cheques::SecurityEmitterCheque;
+}
+
+pub mod test_utils {
+    pub use super::_test_utils::{mock_currency_1,
+                                 mock_currency_2,
+                                 setup_basic_environment};
 }

src/services/_transactions.rs

@@ -1,20 +1,62 @@
-use rusqlite::{Transaction, Result};
+use rusqlite::{params, Result, Transaction};
+
 use crate::db::accounts::get_account_by_id;
-use crate::db::cheques::Cheque;
+use crate::db::cheques::SecurityEmitterCheque;
 use crate::db::securities::get_security_by_id;
 
+fn _add_securities_to_account(tx: &Transaction,
+                              cheque: &SecurityEmitterCheque) -> Result<()> {
+    let q = "
+    INSERT INTO accounts() VALUES()
+    ";
+    tx.execute(q, params![cheque.amount])?;
+    Ok(())
+}
 
-
-fn cash_cheque(cheque: &Cheque) -> Result<()> {
-    if !cheque.is_valid() {
-
-
-    }
+fn cash_cheque(tx: &Transaction,
+               cheque: &SecurityEmitterCheque) -> Result<()> {
+    cheque.assert_valid(tx)?;
+    // move money to new account
+    _add_securities_to_account(tx, cheque)?;
+    // create transaction log
+    // create cheque log
     Ok(())
 }
 
 fn update_account(tx: &Transaction, account_id: u32) -> Result<()> {
     let account = get_account_by_id(tx, account_id)?;
-    // let sec = get_security_by_id(tx, account.)
     return Ok(());
+}
+
+
+#[cfg(test)]
+mod test {
+    use rusqlite::{Connection, params, Result};
+
+    use crate::db::test_utils;
+    use crate::migration;
+
+    use super::*;
+
+    fn setup() -> Connection {
+        let mut conn = Connection::open_in_memory().unwrap();
+        migration::apply_migrations(&mut conn).unwrap();
+        return conn;
+    }
+
+    #[test]
+    fn test_basic() -> Result<()> {
+        let mut conn = setup();
+        let tx = conn.transaction()?;
+        let (users, securities, accounts) = test_utils::setup_basic_environment(&tx)?;
+        tx.commit()?;
+
+        let tx = conn.transaction()?;
+        // let cheque = SecurityEmitterCheque{
+        //     drawer_user_id: users.get_unchecked(0).id
+        // };
+
+        Ok(())
+    }
+
 }