Function openethereum::blockchain::start_client

fn start_client(
    dirs: Directories, 
    spec: SpecType, 
    pruning: Pruning, 
    pruning_history: u64, 
    pruning_memory: usize, 
    tracing: Switch, 
    fat_db: Switch, 
    compaction: DatabaseCompactionProfile, 
    cache_config: CacheConfig, 
    require_fat_db: bool, 
    max_round_blocks_to_import: usize
) -> Result<ClientService, String>