Aggregate FFI client code in one common place.

Signed-off-by: Yury-Fridlyand <[email protected]>

glide-core/src/ffi/configuration.rs

@@ -0,0 +1,90 @@
+/**
+ * Copyright GLIDE-for-Redis Project Contributors - SPDX Identifier: Apache-2.0
+ */
+use std::ffi::c_char;
+
+/// A mirror of `ConnectionRequest` from [`connection_request.proto`](https://github.com/aws/glide-for-redis/blob/main/glide-core/src/protobuf/connection_request.proto).
+#[repr(C)]
+pub struct ConnectionConfig {
+    pub address_count: usize,
+    /// Pointer to an array.
+    pub addresses: *const *const NodeAddress,
+    pub tls_mode: TlsMode,
+    pub cluster_mode: bool,
+    pub request_timeout: u32,
+    pub read_from: ReadFrom,
+    pub connection_retry_strategy: ConnectionRetryStrategy,
+    pub authentication_info: AuthenticationInfo,
+    pub database_id: u32,
+    pub protocol: ProtocolVersion,
+    pub client_name: *const c_char,
+}
+
+/// A mirror of `NodeAddress` from [`connection_request.proto`](https://github.com/aws/glide-for-redis/blob/main/glide-core/src/protobuf/connection_request.proto).
+/// Represents the address and port of a node in the cluster.
+#[repr(C)]
+pub struct NodeAddress {
+    pub host: *const c_char,
+    pub port: u16,
+}
+
+// TODO replace with redis::TlsMode
+/// A mirror of `TlsMode` from [`connection_request.proto`](https://github.com/aws/glide-for-redis/blob/main/glide-core/src/protobuf/connection_request.proto).
+#[repr(C)]
+pub enum TlsMode {
+    NoTls = 0,
+    Secure = 1,
+    Insecure = 2,
+}
+
+/// A mirror of `ReadFrom` from [`connection_request.proto`](https://github.com/aws/glide-for-redis/blob/main/glide-core/src/protobuf/connection_request.proto).
+/// Represents the client's read from strategy.
+#[repr(C)]
+pub enum ReadFrom {
+    /// Always get from primary, in order to get the freshest data.
+    Primary = 0,
+    /// Spread the requests between all replicas in a round-robin manner. If no replica is available, route the requests to the primary.
+    PreferReplica = 1,
+    LowestLatency = 2,
+    AZAffinity = 3,
+}
+
+/// A mirror of `ConnectionRetryStrategy` from [`connection_request.proto`](https://github.com/aws/glide-for-redis/blob/main/glide-core/src/protobuf/connection_request.proto).
+/// Represents the strategy used to determine how and when to reconnect, in case of connection failures.
+/// The time between attempts grows exponentially, to the formula
+/// ```
+/// rand(0 ... factor * (exponentBase ^ N))
+/// ```
+/// where `N` is the number of failed attempts.
+///
+/// Once the maximum value is reached, that will remain the time between retry attempts until a
+/// reconnect attempt is successful. The client will attempt to reconnect indefinitely.
+#[repr(C)]
+pub struct ConnectionRetryStrategy {
+    /// Number of retry attempts that the client should perform when disconnected from the server,
+    /// where the time between retries increases. Once the retries have reached the maximum value, the
+    /// time between retries will remain constant until a reconnect attempt is successful.
+    pub number_of_retries: u32,
+    /// The multiplier that will be applied to the waiting time between each retry.
+    pub factor: u32,
+    /// The exponent base configured for the strategy.
+    pub exponent_base: u32,
+}
+
+/// A mirror of `AuthenticationInfo` from [`connection_request.proto`](https://github.com/aws/glide-for-redis/blob/main/glide-core/src/protobuf/connection_request.proto).
+#[repr(C)]
+pub struct AuthenticationInfo {
+    pub username: *const c_char,
+    pub password: *const c_char,
+}
+
+// TODO replace with redis::ProtocolVersion
+/// A mirror of `ProtocolVersion` from [`connection_request.proto`](https://github.com/aws/glide-for-redis/blob/main/glide-core/src/protobuf/connection_request.proto).
+/// Represents the communication protocol with the server.
+#[repr(C)]
+pub enum ProtocolVersion {
+    /// Use RESP3 to communicate with the server nodes.
+    RESP3 = 0,
+    /// Use RESP2 to communicate with the server nodes.
+    RESP2 = 1,
+}