syntax = "proto3";

package synctv.proxy.slice_cache;

service ProxySliceCacheService {
    rpc GetSliceCacheStats(GetSliceCacheStatsRequest) returns (SliceCacheStatsResponse);
    rpc PurgeSliceCache(PurgeSliceCacheRequest) returns (PurgeSliceCacheResponse);
    rpc EvictExpiredSliceCache(EvictExpiredSliceCacheRequest) returns (EvictExpiredSliceCacheResponse);
}

message GetSliceCacheStatsRequest {}

message PurgeSliceCacheRequest {}

message EvictExpiredSliceCacheRequest {}

message SliceCacheConfigInfo {
    bool engine_enabled = 1;
    string backend = 3;
    string file_cache_dir = 4;
    uint64 slice_size = 5;
    uint64 max_cache_size = 6;
    uint64 segment_ttl_secs = 9;
    uint64 stale_max_age_secs = 10;
    bool stale_while_revalidate = 11;
    uint64 eviction_interval_secs = 12;
    double watermark_ratio = 13;
}

message SliceCacheStatsResponse {
    string node_id = 1;
    SliceCacheConfigInfo config = 2;
    uint64 current_size_bytes = 3;
    uint64 entry_count = 4;
    uint64 metadata_entries = 5;
    uint64 updating_entries = 6;
    uint64 lock_count = 7;
    double usage_ratio = 8;
}

message PurgeSliceCacheResponse {
    string node_id = 1;
    bool success = 2;
    uint64 removed_entries = 3;
    uint64 freed_bytes = 4;
    SliceCacheStatsResponse stats = 5;
}

message EvictExpiredSliceCacheResponse {
    string node_id = 1;
    bool success = 2;
    uint64 removed_expired_entries = 3;
    SliceCacheStatsResponse stats = 4;
}