syntax = "proto3";

package cache;

option go_package = "./proto;cache";

service Cache {
	rpc Get(GetRequest) returns (GetResponse) {}
	rpc Set(SetRequest) returns (SetResponse) {}
	rpc Delete(DeleteRequest) returns (DeleteResponse) {}
	rpc Increment(IncrementRequest) returns (IncrementResponse) {}
	rpc Decrement(DecrementRequest) returns (DecrementResponse) {}
}

// Get an item from the cache by key. If key is not found, an empty response is returned.
message GetRequest {
	// The key to retrieve
	string key = 1;
}

message GetResponse {
	// The key
	string key = 1;
	// The value
	string value = 2;
	// Time to live in seconds
	int64 ttl = 3;
}

// Set an item in the cache. Overwrites any existing value already set.
message SetRequest {
	// The key to update
	string key = 1;
	// The value to set
	string value = 2;
	// Time to live in seconds
	int64 ttl = 3;
}

message SetResponse {
	// Returns "ok" if successful
	string status = 1;
}

// Delete a value from the cache. If key not found a success response is returned.
message DeleteRequest {
	// The key to delete
	string key = 1;
}

message DeleteResponse {
	// Returns "ok" if successful
	string status = 1;
}

// Increment a value (if it's a number). If key not found it is equivalent to set.
message IncrementRequest {
	// The key to increment
	string key = 1;
	// The amount to increment the value by
	int64 value = 2;
}

message IncrementResponse {
	// The key incremented
	string key = 1;
	// The new value
	int64 value = 2;
}

// Decrement a value (if it's a number). If key not found it is equivalent to set.
message DecrementRequest {
	// The key to decrement
	string key = 1;
	// The amount to decrement the value by
	int64 value = 2;
}

message DecrementResponse {
	// The key decremented
	string key = 1;
	// The new value
	int64 value = 2;
}