feat(drainer): added drainer which reads from redis stream and executes queries on DB (#142)

crates/storage_models/src/kv.rs

@@ -0,0 +1,61 @@
+use error_stack::{IntoReport, ResultExt};
+use serde::{Deserialize, Serialize};
+
+use crate::{
+    errors,
+    payment_attempt::{PaymentAttempt, PaymentAttemptNew, PaymentAttemptUpdate},
+    payment_intent::{PaymentIntent, PaymentIntentNew, PaymentIntentUpdate},
+};
+
+#[derive(Debug, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case", tag = "db_op", content = "data")]
+pub enum DBOperation {
+    Insert { insertable: Insertable },
+    Update { updatable: Updateable },
+    Delete,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct TypedSql {
+    #[serde(flatten)]
+    pub op: DBOperation,
+}
+
+impl TypedSql {
+    pub fn to_field_value_pairs(
+        &self,
+    ) -> crate::CustomResult<Vec<(&str, String)>, errors::DatabaseError> {
+        Ok(vec![(
+            "typed_sql",
+            serde_json::to_string(self)
+                .into_report()
+                .change_context(errors::DatabaseError::QueryGenerationFailed)?,
+        )])
+    }
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case", tag = "table", content = "data")]
+pub enum Insertable {
+    PaymentIntent(PaymentIntentNew),
+    PaymentAttempt(PaymentAttemptNew),
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case", tag = "table", content = "data")]
+pub enum Updateable {
+    PaymentIntentUpdate(PaymentIntentUpdateMems),
+    PaymentAttemptUpdate(PaymentAttemptUpdateMems),
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct PaymentIntentUpdateMems {
+    pub orig: PaymentIntent,
+    pub update_data: PaymentIntentUpdate,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct PaymentAttemptUpdateMems {
+    pub orig: PaymentAttempt,
+    pub update_data: PaymentAttemptUpdate,
+}