feat: add unique constraint restriction for KV (#3723)

Co-authored-by: hyperswitch-bot[bot] <148525504+hyperswitch-bot[bot]@users.noreply.github.com>

crates/redis_interface/src/commands.rs

@@ -15,11 +15,11 @@ use common_utils::{
 };
 use error_stack::{IntoReport, ResultExt};
 use fred::{
-    interfaces::{HashesInterface, KeysInterface, StreamsInterface},
+    interfaces::{HashesInterface, KeysInterface, SetsInterface, StreamsInterface},
     prelude::RedisErrorKind,
     types::{
         Expiration, FromRedis, MultipleIDs, MultipleKeys, MultipleOrderedPairs, MultipleStrings,
-        RedisKey, RedisMap, RedisValue, Scanner, SetOptions, XCap, XReadResponse,
+        MultipleValues, RedisKey, RedisMap, RedisValue, Scanner, SetOptions, XCap, XReadResponse,
     },
 };
 use futures::StreamExt;
@@ -27,7 +27,7 @@ use router_env::{instrument, logger, tracing};
 
 use crate::{
     errors,
-    types::{DelReply, HsetnxReply, MsetnxReply, RedisEntryId, SetnxReply},
+    types::{DelReply, HsetnxReply, MsetnxReply, RedisEntryId, SaddReply, SetnxReply},
 };
 
 impl super::RedisConnectionPool {
@@ -466,6 +466,23 @@ impl super::RedisConnectionPool {
             .change_context(errors::RedisError::JsonDeserializationFailed)
     }
 
+    #[instrument(level = "DEBUG", skip(self))]
+    pub async fn sadd<V>(
+        &self,
+        key: &str,
+        members: V,
+    ) -> CustomResult<SaddReply, errors::RedisError>
+    where
+        V: TryInto<MultipleValues> + Debug + Send,
+        V::Error: Into<fred::error::RedisError> + Send,
+    {
+        self.pool
+            .sadd(key, members)
+            .await
+            .into_report()
+            .change_context(errors::RedisError::SetAddMembersFailed)
+    }
+
     #[instrument(level = "DEBUG", skip(self))]
     pub async fn stream_append_entry<F>(
         &self,

crates/redis_interface/src/errors.rs

@@ -50,6 +50,8 @@ pub enum RedisError {
     SetHashFailed,
     #[error("Failed to set hash field in Redis")]
     SetHashFieldFailed,
+    #[error("Failed to add members to set in Redis")]
+    SetAddMembersFailed,
     #[error("Failed to get hash field in Redis")]
     GetHashFieldFailed,
     #[error("The requested value was not found in Redis")]

crates/redis_interface/src/types.rs

@@ -255,3 +255,22 @@ impl fred::types::FromRedis for DelReply {
         }
     }
 }
+
+#[derive(Debug)]
+pub enum SaddReply {
+    KeySet,
+    KeyNotSet,
+}
+
+impl fred::types::FromRedis for SaddReply {
+    fn from_value(value: fred::types::RedisValue) -> Result<Self, fred::error::RedisError> {
+        match value {
+            fred::types::RedisValue::Integer(1) => Ok(Self::KeySet),
+            fred::types::RedisValue::Integer(0) => Ok(Self::KeyNotSet),
+            _ => Err(fred::error::RedisError::new(
+                fred::error::RedisErrorKind::Unknown,
+                "Unexpected sadd command reply",
+            )),
+        }
+    }
+}