Implement AWS key value store

crates/factor-key-value/src/host.rs

@@ -283,10 +283,10 @@ impl wasi_keyvalue::batch::Host for KeyValueDispatch {
         keys: Vec<String>,
     ) -> std::result::Result<Vec<(String, Option<Vec<u8>>)>, wasi_keyvalue::store::Error> {
         let store = self.get_store_wasi(bucket)?;
-        store
-            .get_many(keys.iter().map(|k| k.to_string()).collect())
-            .await
-            .map_err(to_wasi_err)
+        if keys.is_empty() {
+            return Ok(vec![]);
+        }
+        store.get_many(keys).await.map_err(to_wasi_err)
     }
 
     #[instrument(name = "spin_key_value.set_many", skip(self, bucket, key_values), err(level = Level::INFO), fields(otel.kind = "client"))]
@@ -296,6 +296,9 @@ impl wasi_keyvalue::batch::Host for KeyValueDispatch {
         key_values: Vec<(String, Vec<u8>)>,
     ) -> std::result::Result<(), wasi_keyvalue::store::Error> {
         let store = self.get_store_wasi(bucket)?;
+        if key_values.is_empty() {
+            return Ok(());
+        }
         store.set_many(key_values).await.map_err(to_wasi_err)
     }
 
@@ -306,10 +309,10 @@ impl wasi_keyvalue::batch::Host for KeyValueDispatch {
         keys: Vec<String>,
     ) -> std::result::Result<(), wasi_keyvalue::store::Error> {
         let store = self.get_store_wasi(bucket)?;
-        store
-            .delete_many(keys.iter().map(|k| k.to_string()).collect())
-            .await
-            .map_err(to_wasi_err)
+        if keys.is_empty() {
+            return Ok(());
+        }
+        store.delete_many(keys).await.map_err(to_wasi_err)
     }
 }
 
@@ -355,6 +358,13 @@ impl wasi_keyvalue::atomics::HostCas for KeyValueDispatch {
 
 #[async_trait]
 impl wasi_keyvalue::atomics::Host for KeyValueDispatch {
+    fn convert_cas_error(
+        &mut self,
+        error: spin_world::wasi::keyvalue::atomics::CasError,
+    ) -> std::result::Result<spin_world::wasi::keyvalue::atomics::CasError, anyhow::Error> {
+        Ok(error)
+    }
+
     #[instrument(name = "spin_key_value.increment", skip(self, bucket, key, delta), err(level = Level::INFO), fields(otel.kind = "client"))]
     async fn increment(
         &mut self,
@@ -371,27 +381,29 @@ impl wasi_keyvalue::atomics::Host for KeyValueDispatch {
         &mut self,
         cas_res: Resource<atomics::Cas>,
         value: Vec<u8>,
-    ) -> Result<std::result::Result<(), CasError>> {
+    ) -> Result<(), CasError> {
         let cas_rep = cas_res.rep();
         let cas = self
             .get_cas(Resource::<Bucket>::new_own(cas_rep))
             .map_err(|e| CasError::StoreError(atomics::Error::Other(e.to_string())))?;
 
         match cas.swap(value).await {
-            Ok(_) => Ok(Ok(())),
+            Ok(_) => Ok(()),
             Err(err) => match err {
                 SwapError::CasFailed(_) => {
                     let bucket = Resource::new_own(cas.bucket_rep().await);
-                    let new_cas = self.new(bucket, cas.key().await).await?;
+                    let new_cas = self
+                        .new(bucket, cas.key().await)
+                        .await
+                        .map_err(CasError::StoreError)?;
                     let new_cas_rep = new_cas.rep();
-                    self.current(Resource::new_own(new_cas_rep)).await?;
-                    Err(anyhow::Error::new(CasError::CasFailed(Resource::new_own(
-                        new_cas_rep,
-                    ))))
+                    self.current(Resource::new_own(new_cas_rep))
+                        .await
+                        .map_err(CasError::StoreError)?;
+                    let res = Resource::new_own(new_cas_rep);
+                    Err(CasError::CasFailed(res))
                 }
-                SwapError::Other(msg) => Err(anyhow::Error::new(CasError::StoreError(
-                    atomics::Error::Other(msg),
-                ))),
+                SwapError::Other(msg) => Err(CasError::StoreError(atomics::Error::Other(msg))),
             },
         }
     }

crates/factor-key-value/src/util.rs

@@ -251,6 +251,11 @@ impl Store for CachingStore {
         keys: Vec<String>,
     ) -> anyhow::Result<Vec<(String, Option<Vec<u8>>)>, Error> {
         let mut state = self.state.lock().await;
+
+        // Flush any outstanding writes first in case entries have been popped off the end of the LRU cache prior
+        // to their corresponding writes reaching the backing store.
+        state.flush().await?;
+
         let mut found: Vec<(String, Option<Vec<u8>>)> = Vec::new();
         let mut not_found: Vec<String> = Vec::new();
         for key in keys {
@@ -260,10 +265,12 @@ impl Store for CachingStore {
             }
         }
 
-        let keys_and_values = self.inner.get_many(not_found).await?;
-        for (key, value) in keys_and_values {
-            found.push((key.clone(), value.clone()));
-            state.cache.put(key, value);
+        if !not_found.is_empty() {
+            let keys_and_values = self.inner.get_many(not_found).await?;
+            for (key, value) in keys_and_values {
+                found.push((key.clone(), value.clone()));
+                state.cache.put(key, value);
+            }
         }
 
         Ok(found)

crates/key-value-aws/Cargo.toml

@@ -0,0 +1,22 @@
+[package]
+name = "spin-key-value-aws"
+version.workspace = true
+authors.workspace = true
+edition.workspace = true
+license.workspace = true
+homepage.workspace = true
+repository.workspace = true
+rust-version.workspace = true
+
+[dependencies]
+anyhow = { workspace = true }
+async-once-cell = "0.5.4"
+aws-config = "1.1.7"
+aws-credential-types = "1.1.7"
+aws-sdk-dynamodb = "1.49.0"
+serde = { workspace = true }
+spin-core = { path = "../core" }
+spin-factor-key-value = { path = "../factor-key-value" }
+
+[lints]
+workspace = true

crates/key-value-aws/src/lib.rs

@@ -0,0 +1,74 @@
+mod store;
+
+use serde::Deserialize;
+use spin_factor_key_value::runtime_config::spin::MakeKeyValueStore;
+use store::{
+    KeyValueAwsDynamo, KeyValueAwsDynamoAuthOptions, KeyValueAwsDynamoRuntimeConfigOptions,
+};
+
+/// A key-value store that uses AWS Dynamo as the backend.
+#[derive(Default)]
+pub struct AwsDynamoKeyValueStore {
+    _priv: (),
+}
+
+impl AwsDynamoKeyValueStore {
+    /// Creates a new `AwsKeyValueStore`.
+    pub fn new() -> Self {
+        Self::default()
+    }
+}
+
+/// Runtime configuration for the AWS Dynamo key-value store.
+#[derive(Deserialize)]
+pub struct AwsDynamoKeyValueRuntimeConfig {
+    /// The access key for the AWS Dynamo DB account role.
+    access_key: Option<String>,
+    /// The secret key for authorization on the AWS Dynamo DB account.
+    secret_key: Option<String>,
+    /// The token for authorization on the AWS Dynamo DB account.
+    token: Option<String>,
+    /// The AWS region where the database is located
+    region: String,
+    /// Boolean determining whether to use strongly consistent reads.
+    /// Defaults to `false` but can be set to `true` to improve atomicity
+    consistent_read: Option<bool>,
+    /// The AWS Dynamo DB table.
+    table: String,
+}
+
+impl MakeKeyValueStore for AwsDynamoKeyValueStore {
+    const RUNTIME_CONFIG_TYPE: &'static str = "aws_dynamo";
+
+    type RuntimeConfig = AwsDynamoKeyValueRuntimeConfig;
+
+    type StoreManager = KeyValueAwsDynamo;
+
+    fn make_store(
+        &self,
+        runtime_config: Self::RuntimeConfig,
+    ) -> anyhow::Result<Self::StoreManager> {
+        let AwsDynamoKeyValueRuntimeConfig {
+            access_key,
+            secret_key,
+            token,
+            region,
+            consistent_read,
+            table,
+        } = runtime_config;
+        let auth_options = match (access_key, secret_key) {
+            (Some(access_key), Some(secret_key)) => {
+                KeyValueAwsDynamoAuthOptions::RuntimeConfigValues(
+                    KeyValueAwsDynamoRuntimeConfigOptions::new(access_key, secret_key, token),
+                )
+            }
+            _ => KeyValueAwsDynamoAuthOptions::Environmental,
+        };
+        KeyValueAwsDynamo::new(
+            region,
+            consistent_read.unwrap_or(false),
+            table,
+            auth_options,
+        )
+    }
+}