(**************************************************************************) (* *) (* Copyright (c) 2014 - 2016. *) (* Dynamic Ledger Solutions, Inc. *) (* *) (* All rights reserved. No warranty, explicit or implicit, provided. *) (* *) (**************************************************************************) open Logging.Node.State type error += | Invalid_fitness of Fitness.fitness * Fitness.fitness | Unknown_protocol of Protocol_hash.t | Inactive_network of Store.net_id | Unknown_network of Store.net_id | Cannot_parse let () = Error_monad.register_error_kind `Temporary ~id:"state.invalid_fitness" ~title:"Invalid fitness" ~description:"The computed fitness differs from the fitness found \ \ in the block header." ~pp:(fun ppf (expected, found) -> Format.fprintf ppf "@[Invalid fitness@ \ \ expected %a@ \ \ found %a" Fitness.pp expected Fitness.pp found) Data_encoding.(obj2 (req "expected" Fitness.encoding) (req "found" Fitness.encoding)) (function Invalid_fitness (e, f) -> Some (e, f) | _ -> None) (fun (e, f) -> Invalid_fitness (e, f)) ; Error_monad.register_error_kind `Temporary ~id:"state.unknown_network" ~title:"Unknown network" ~description:"TODO" ~pp:(fun ppf (Store.Net id) -> Format.fprintf ppf "Unknown network %a" Block_hash.pp_short id) Data_encoding.(obj1 (req "net" Updater.net_id_encoding)) (function Unknown_network x -> Some x | _ -> None) (fun x -> Unknown_network x) ; module Watcher = struct type 'a t = { id: int ; push: ('a option -> unit) ; } let notify watchers info = List.iter (fun w -> w.push (Some info)) watchers let create_stream watchers = let cpt = ref 0 in fun () -> let id = incr cpt ; !cpt in let stream, push = Lwt_stream.create () in watchers := { id ; push } :: !watchers ; let unregister () = push None ; watchers := List.filter (fun w -> w.id <> id) !watchers in stream, unregister end (** *) type net_id = Store.net_id = Net of Block_hash.t type t = { mutable active_net: net list ; nets: net Block_hash_table.t ; store: Store.store ; block_db: Db_proxy.Block.t ; block_watchers: (Block_hash.t * Store.block) Watcher.t list ref ; operation_db: Db_proxy.Operation.t ; operation_watchers: (Operation_hash.t * Store.operation) Watcher.t list ref ; valid_block_state: valid_block_state Persist.shared_ref ; } and state = t and net = { state: state ; net_store: Store.net_store ; blockchain_state: blockchain_state Persist.shared_ref ; } and valid_block_state = { global_store: Store.generic_store Persist.shared_ref ; ttl: Int64.t ; index: Context.index ; block_db: Db_proxy.Block.t ; watchers: valid_block Watcher.t list ref ; } and blockchain_state = { genesis_block: valid_block ; current_head: valid_block ; current_protocol: (module Updater.REGISTRED_PROTOCOL) ; mempool: Operation_hash_set.t ; blockchain_store: Store.blockchain_store Persist.shared_ref ; } and valid_block = { net_id: net_id ; hash: Block_hash.t ; pred: Block_hash.t ; timestamp: Time.t ; fitness: Protocol.fitness ; operations: Operation_hash.t list ; discovery_time: Time.t ; protocol_hash: Protocol_hash.t ; protocol: (module Updater.REGISTRED_PROTOCOL) option ; test_protocol_hash: Protocol_hash.t ; test_protocol: (module Updater.REGISTRED_PROTOCOL) option ; test_network: (net_id * Time.t) option ; context: Context.t ; successors: Block_hash_set.t ; invalid_successors: Block_hash_set.t ; } module KnownHeads_key = struct include Block_hash let prefix = ["state"; "known_heads"] let length = path_len end module KnownHeads = Persist.MakeBufferedPersistentSet (Store.Faked_functional_store) (KnownHeads_key) (Block_hash_set) module KnownNets_key = struct include Block_hash let prefix = ["state"; "known_nets"] let length = path_len end module KnownNets = Persist.MakeBufferedPersistentSet (Store.Faked_functional_store) (KnownNets_key) (Block_hash_set) module InvalidOperations_key = struct include Operation_hash let prefix = ["state"; "invalid_operations"] let length = path_len end module InvalidOperations = Persist.MakeBufferedPersistentSet (Store.Faked_functional_store) (InvalidOperations_key) (Operation_hash_set) module InvalidBlocks_key = struct include Block_hash let prefix = ["state"; "invalid_blocks"] let length = path_len end module InvalidBlocks = Persist.MakeBufferedPersistentSet (Store.Faked_functional_store) (InvalidBlocks_key) (Block_hash_set) module PostponedBlocks_key = struct include Block_hash let prefix = ["state"; "postponed_blocks"] let length = path_len end module PostponedBlocks = Persist.MakeBufferedPersistentSet (Store.Faked_functional_store) (PostponedBlocks_key) (Block_hash_set) let net_is_active { active_net } net_id = let same_id (Net id) { net_store = { net_genesis = { block } } } = Block_hash.equal id block in List.exists (same_id net_id) active_net module Operation = struct type key = Store.Operation.key type shell_header = Store.shell_operation = { net_id: net_id ; } type t = Store.operation = { shell: shell_header ; proto: MBytes.t ; } type operation = t exception Invalid of key * error list let of_bytes = Store.Operation.of_bytes let to_bytes = Store.Operation.to_bytes let known t k = Db_proxy.Operation.known t.operation_db k let read t k = Db_proxy.Operation.read t.operation_db k let read_exn t k = Db_proxy.Operation.read t.operation_db k >>= function | None -> Lwt.fail Not_found | Some { data = Error e } -> Lwt.fail (Invalid (k, e)) | Some { data = Ok data ; time } -> Lwt.return { Time.data ; time } let hash = Store.Operation.hash let raw_read t k = Persist.use t.store.Store.operation (fun store -> Store.Operation.raw_get store k) let prefetch t net_id ks = List.iter (Db_proxy.Operation.prefetch t.operation_db net_id) ks let fetch t net_id k = Db_proxy.Operation.fetch t.operation_db net_id k let store t bytes = match of_bytes bytes with | None -> fail Cannot_parse | Some op -> if not (net_is_active t op.shell.net_id) then fail (Inactive_network op.shell.net_id) else let h = hash op in Db_proxy.Operation.store t.operation_db h (Time.make_timed (Ok op)) >>= function | true -> Watcher.notify !(t.operation_watchers) (h, op) ; return (Some (h, op)) | false -> return None let mark_invalid t k e = Db_proxy.Operation.update t.operation_db k (Time.make_timed (Error e)) >>= function | true -> Persist.update t.store.global_store (fun store -> InvalidOperations.set store k >>= fun store -> Lwt.return (Some store)) >>= fun _ -> Lwt.return true | false -> Lwt.return false let invalid state = Persist.use state.store.global_store InvalidOperations.read let create_watcher t = Watcher.create_stream t.operation_watchers () end let iter_predecessors (type t) (compare: t -> t -> int) (predecessor: state -> t -> t option Lwt.t) (date: t -> Time.t) (fitness: t -> Fitness.fitness) state ?max ?min_fitness ?min_date heads ~f = let module Local = struct exception Exit end in let pop, push = (* Poor-man priority queue *) let queue : t list ref = ref [] in let pop () = match !queue with | [] -> None | b :: bs -> queue := bs ; Some b in let push b = let rec loop = function | [] -> [b] | b' :: bs' as bs -> let cmp = compare b b' in if cmp = 0 then bs else if cmp < 0 then b' :: loop bs' else b :: bs in queue := loop !queue in pop, push in let check_count = match max with | None -> (fun () -> ()) | Some max -> let cpt = ref 0 in fun () -> if !cpt >= max then raise Local.Exit ; incr cpt in let check_fitness = match min_fitness with | None -> (fun _ -> true) | Some min_fitness -> (fun b -> Fitness.compare min_fitness (fitness b) <= 0) in let check_date = match min_date with | None -> (fun _ -> true) | Some min_date -> (fun b -> Time.compare min_date (date b) <= 0) in let rec loop () = match pop () with | None -> return () | Some b -> check_count () ; f b >>= fun () -> predecessor state b >>= function | None -> loop () | Some p -> if check_fitness p && check_date p then push p ; loop () in List.iter push heads ; try loop () with Local.Exit -> return () module Block = struct type shell_header = Store.shell_block = { net_id: net_id ; predecessor: Block_hash.t ; timestamp: Time.t ; fitness: MBytes.t list ; operations: Operation_hash.t list ; } type t = Store.block = { shell: shell_header ; proto: MBytes.t ; } type block = t let of_bytes = Store.Block.of_bytes let to_bytes = Store.Block.to_bytes let known t k = Db_proxy.Block.known t.block_db k let db_read db k = Db_proxy.Block.read db k >>= function | None -> Lwt.return_none | Some (_, lazy block) -> block let read t k = db_read t.block_db k let read_exn t k = read t k >>= function | None -> Lwt.fail Not_found | Some { data = data ; time } -> Lwt.return { Time.data ; time } let hash = Store.Block.hash let raw_read t k = Persist.use t.store.Store.block (fun store -> Store.Block.raw_get store k) let read_pred t k = Db_proxy.Block.read t.block_db k >>= function | None -> Lwt.return_none | Some (pred, _) -> Lwt.return (Some pred) let read_pred_exn t k = read_pred t k >>= function | None -> Lwt.fail Not_found | Some pred -> Lwt.return pred let prefetch t net_id ks = List.iter (Db_proxy.Block.prefetch t.block_db net_id) ks let fetch t net_id k = Db_proxy.Block.fetch t.block_db net_id k >>= fun (_, lazy block) -> block >>= function | None -> assert false | Some block -> Lwt.return block let db_store db k (v: Store.block) = Db_proxy.Block.store db k (v.shell.predecessor, lazy (Lwt.return (Some (Time.make_timed v)))) let store t bytes = match of_bytes bytes with | None -> fail Cannot_parse | Some b -> if not (net_is_active t b.shell.net_id) then fail (Inactive_network b.shell.net_id) else let h = hash b in db_store t.block_db h b >>= function | true -> Persist.update t.store.global_store (fun store -> PostponedBlocks.set store h >>= fun store -> Lwt.return (Some store)) >>= fun _ -> Watcher.notify !(t.block_watchers) (h, b) ; return (Some (h, b)) | false -> return None let create_watcher t = Watcher.create_stream t.block_watchers () let check_block state h = known state h >>= function | true -> return () | false -> failwith "Unknown block" let path state h1 h2 = trace_exn (Failure "State.path") begin check_block state h1 >>=? fun () -> check_block state h2 >>=? fun () -> let rec loop acc h = if Block_hash.equal h h1 then return acc else read_pred state h >>= function | None -> failwith "not an ancestor" | Some pred -> loop (h :: acc) pred in loop [] h2 end let common_ancestor state h1 h2 = trace_exn (Failure "State.common_ancestor") begin check_block state h1 >>=? fun () -> check_block state h2 >>=? fun () -> let queue = Queue.create () in let rec visit seen = let h = Queue.pop queue in if Block_hash_set.mem h seen then return h else let seen = Block_hash_set.add h seen in read_pred state h >>= function | None -> failwith ".." | Some pred -> if not (Block_hash.equal pred h) then Queue.push pred queue; visit seen in Queue.push h1 queue; Queue.push h2 queue; Lwt.catch (fun () -> visit Block_hash_set.empty) (function exn -> Lwt.return (error_exn exn)) end let rec block_locator_loop state acc sz step cpt h = if sz = 0 then Lwt.return (List.rev acc) else read_pred state h >>= function | None -> Lwt.return (List.rev (h :: acc)) | Some pred -> if cpt = 0 then block_locator_loop state (h :: acc) (sz - 1) (step * 2) (step * 20 - 1) pred else if cpt mod step = 0 then block_locator_loop state (h :: acc) (sz - 1) step (cpt - 1) pred else block_locator_loop state acc sz step (cpt - 1) pred let block_locator state sz h = trace_exn (Failure "State.block_locator") begin check_block state h >>=? fun () -> block_locator_loop state [] sz 1 9 h >>= fun locator -> return locator end let iter_predecessors = let compare b1 b2 = match Fitness.compare b1.shell.fitness b2.shell.fitness with | 0 -> begin match Time.compare b1.shell.timestamp b2.shell.timestamp with | 0 -> Block_hash.compare (hash b1) (hash b2) | res -> res end | res -> res in let predecessor state b = read state b.shell.predecessor >|= function | None -> None | Some { data } -> if Block_hash.equal data.shell.predecessor b.shell.predecessor && Block_hash.equal (hash b) b.shell.predecessor then None else Some data in iter_predecessors compare predecessor (fun b -> b.shell.timestamp) (fun b -> b.shell.fitness) end module Valid_block = struct type t = valid_block = { net_id: net_id ; hash: Block_hash.t ; pred: Block_hash.t ; timestamp: Time.t ; fitness: Protocol.fitness ; operations: Operation_hash.t list ; discovery_time: Time.t ; protocol_hash: Protocol_hash.t ; protocol: (module Updater.REGISTRED_PROTOCOL) option ; test_protocol_hash: Protocol_hash.t ; test_protocol: (module Updater.REGISTRED_PROTOCOL) option ; test_network: (net_id * Time.t) option ; context: Context.t ; successors: Block_hash_set.t ; invalid_successors: Block_hash_set.t ; } type valid_block = t let use state f = Persist.use state.valid_block_state f let update state f = Persist.update state.valid_block_state f let update_with_res state f = Persist.update_with_res state.valid_block_state f let raw_read' { Time.data = { Store.shell = block } ; time = discovery_time } successors invalid_successors index hash = Context.checkout index hash >>= function | (None | Some (Error _)) as e -> Lwt.return e | Some (Ok context) -> Context.get_protocol context >>= fun protocol_hash -> Context.get_test_protocol context >>= fun test_protocol_hash -> Context.get_test_network context >>= fun test_network -> Context.get_test_network_expiration context >>= fun test_network_expiration -> let test_network = match test_network, test_network_expiration with | None, _ | _, None -> None | Some net_id, Some time -> Some (net_id, time) in let protocol = Updater.get protocol_hash in let test_protocol = Updater.get test_protocol_hash in let valid_block = { net_id = block.net_id ; hash ; pred = block.predecessor ; timestamp = block.timestamp ; discovery_time ; operations = block.operations ; fitness = block.fitness ; protocol_hash ; protocol ; test_protocol_hash ; test_protocol ; test_network ; context ; successors ; invalid_successors ; } in Lwt.return (Some (Ok valid_block)) let raw_read store block_db index hash = Block.db_read block_db hash >>= function | None -> (* TODO handle internal error... *) Lwt.return_none | Some block -> Persist.use store (fun store -> Store.Block_valid_succs.get store hash >|= function | None -> Block_hash_set.empty | Some set -> set) >>= fun valid_successors -> Persist.use store (fun store -> Store.Block_invalid_succs.get store hash >|= function | None -> Block_hash_set.empty | Some set -> set) >>= fun invalid_successors -> raw_read' block valid_successors invalid_successors index hash let create ?patch_context ~context_root store block_db ttl = Context.init ?patch_context ~root:context_root >>= fun index -> let ttl = Int64.of_int ttl in Lwt.return (Persist.share { global_store = store ; block_db ; index ; ttl ; watchers = ref [] }) let locked_valid vstate h = Context.checkout vstate.index h >>= function | None | Some (Error _) -> Lwt.return_false | Some (Ok _) -> Lwt.return true let locked_known vstate h = Context.exists vstate.index h exception Invalid of Block_hash.t * error list let locked_read (vstate: valid_block_state) hash = raw_read vstate.global_store vstate.block_db vstate.index hash let locked_read_exn vstate hash = locked_read vstate hash >>= function | None -> Lwt.fail Not_found | Some (Error e) -> Lwt.fail (Invalid (hash, e)) | Some (Ok data) -> Lwt.return data let locked_store vstate hash context = Context.exists vstate.index hash >>= function | true -> Lwt.return (Error []) (* TODO fail ?? *) | false -> Block.db_read vstate.block_db hash >>= function | None -> assert false | Some { data = block } -> Context.get_protocol context >>= fun protocol_hash -> match Updater.get protocol_hash with | None -> lwt_log_error "State.Validated_block: unknown protocol (%a)" Protocol_hash.pp_short protocol_hash >>= fun () -> Lwt.return (Error [Unknown_protocol protocol_hash]) | Some (module Proto) -> Proto.fitness context >>= fun fitness -> if Fitness.compare fitness block.Store.shell.fitness <> 0 then begin let err = Invalid_fitness (block.Store.shell.fitness, fitness) in Context.commit_invalid vstate.index block hash [err] >>= fun () -> Lwt.return (Error [err]) end else begin Context.read_and_reset_fork_test_network context >>= fun (fork, context) -> begin if fork then begin let eol = Time.(add block.shell.timestamp vstate.ttl) in Context.set_test_network context (Net hash) >>= fun context -> Context.set_test_network_expiration context eol >>= fun context -> lwt_log_notice "Fork test network for %a (eol: %a)" Block_hash.pp_short hash Time.pp_hum eol >>= fun () -> Lwt.return context end else begin Context.get_test_network_expiration context >>= function | Some eol when Time.(eol <= now ()) -> lwt_log_notice "Stop test network for %a (eol: %a, now: %a)" Block_hash.pp_short hash Time.pp_hum eol Time.pp_hum (Time.now ()) >>= fun () -> Context.del_test_network context >>= fun context -> Context.del_test_network_expiration context | None | Some _ -> Lwt.return context end end >>= fun context -> Context.commit vstate.index block hash context >>= fun () -> locked_read_exn vstate hash >>= fun valid_block -> Persist.update vstate.global_store (fun store -> KnownHeads.del store block.shell.predecessor >>= fun store -> KnownHeads.set store hash >>= fun store -> PostponedBlocks.del store hash >>= fun store -> begin Store.Block_valid_succs.get store block.shell.predecessor >|= function | None -> Block_hash_set.singleton hash | Some set -> Block_hash_set.add hash set end >>= fun successors -> Store.Block_valid_succs.set store block.shell.predecessor successors >>= fun () -> Lwt.return (Some store)) >>= fun _ -> Watcher.notify !(vstate.watchers) valid_block ; Lwt.return (Ok valid_block) end let create_genesis_block state (genesis: Store.genesis) test_protocol = use state (fun vstate -> locked_read vstate genesis.block >>= function | Some res -> (* TODO check coherency: test_protocol. *) Lwt.return res | None -> let test_protocol = Utils.unopt genesis.protocol test_protocol in Context.create_genesis_context vstate.index genesis test_protocol >>= fun _context -> Block.db_store vstate.block_db genesis.block { shell = { net_id = Net genesis.block ; predecessor = genesis.block ; timestamp = genesis.time ; fitness = [] ; operations = [] ; } ; proto = MBytes.create 0 ; } >>= fun _ -> locked_read vstate genesis.block >>= function | None -> failwith "" | Some (Error _ as err) -> Lwt.return err | Some (Ok valid_block) -> Persist.update vstate.global_store (fun store -> KnownHeads.set store valid_block.hash >>= fun store -> Lwt.return (Some store)) >>= fun _ -> return valid_block) let locked_store_invalid vstate hash exns = Context.exists vstate.index hash >>= function | true -> Lwt.return false (* TODO fail ?? *) | false -> Block.db_read vstate.block_db hash >>= function | None -> assert false | Some { data = block } -> Context.commit_invalid vstate.index block hash exns >>= fun () -> Persist.update vstate.global_store (fun store -> InvalidBlocks.set store hash >>= fun store -> begin Store.Block_invalid_succs.get store block.shell.predecessor >|= function | None -> Block_hash_set.singleton hash | Some set -> Block_hash_set.add hash set end >>= fun successors -> Store.Block_invalid_succs.set store block.shell.predecessor successors >>= fun () -> Lwt.return (Some store)) >>= fun _ -> Lwt.return true let get_store { valid_block_state } = valid_block_state let valid state h = use state (fun vstate -> locked_valid vstate h) let known state h = use state (fun vstate -> locked_known vstate h) let read state hash = use state (fun vstate -> locked_read vstate hash) let read_exn state hash = use state (fun vstate -> locked_read_exn vstate hash) let store state hash context = use state (fun vstate -> locked_store vstate hash context) >>= fun block -> Lwt.return block let store_invalid state hash exns = use state (fun vstate -> locked_store_invalid vstate hash exns) let known_heads state = use state (fun vstate -> Persist.use vstate.global_store KnownHeads.read >>= fun heads -> let elements = Block_hash_set.elements heads in Lwt_list.fold_left_s (fun set hash -> Block.db_read vstate.block_db hash >>= function | None -> Lwt.return set | Some block -> Persist.use vstate.global_store (fun store -> begin Store.Block_invalid_succs.get store block.data.shell.predecessor >|= function | None -> Block_hash_set.singleton hash | Some set -> set end) >>= fun invalid_successors -> raw_read' block Block_hash_set.empty invalid_successors vstate.index hash >>= function | Some (Ok bl) -> Lwt.return (Block_hash_map.add hash bl set) | None | Some (Error _) -> lwt_log_error "Error while reading \"known_heads\". Ignoring %a." Block_hash.pp_short hash >>= fun () -> Lwt.return set) Block_hash_map.empty elements) let postponed state = use state (fun vstate -> Persist.use vstate.global_store PostponedBlocks.read) let invalid state = use state (fun vstate -> Persist.use vstate.global_store InvalidBlocks.read) let path state b1 b2 = let rec loop acc b = if Block_hash.equal b.hash b1.hash then Lwt.return (Some acc) else read state b.pred >>= function | None -> Lwt.return None | Some (Error _) -> assert false | Some (Ok pred) -> loop (b :: acc) pred in loop [] b2 let common_ancestor state b1 b2 = let queue = Queue.create () in let rec visit seen = let b = Queue.pop queue in if Block_hash_set.mem b.hash seen then Lwt.return b else let seen = Block_hash_set.add b.hash seen in read state b.pred >>= function | None -> visit seen | Some (Error _) -> assert false | Some (Ok pred) -> if not (Block_hash.equal pred.hash b.hash) then Queue.push pred queue; visit seen in Queue.push b1 queue; Queue.push b2 queue; visit Block_hash_set.empty let block_locator state sz b = Block.block_locator_loop state [] sz 1 9 b.hash let new_blocks state cur_block new_block = common_ancestor state cur_block new_block >>= fun ancestor -> path state ancestor new_block >>= function | None -> assert false | Some path -> Lwt.return (ancestor, path) let create_watcher state = use state (fun vstate -> Lwt.return (Watcher.create_stream vstate.watchers ())) module Store = struct type t = valid_block_state type key = Block_hash.t type value = Context.t tzresult let mem vstate h = locked_known vstate h let del _ _ = assert false (* unused *) let get vstate hash = locked_read vstate hash >>= function | None -> Lwt.return None | Some (Ok { context }) -> Lwt.return (Some (Ok context)) | Some (Error exns) -> Lwt.return (Some (Error exns)) let set vstate hash = function | Ok context -> begin locked_store vstate hash context >>= fun _ -> Lwt.return vstate end | Error exns -> locked_store_invalid vstate hash exns >>= fun _changed -> Lwt.return vstate end let iter_predecessors = let compare b1 b2 = match Fitness.compare b1.fitness b2.fitness with | 0 -> begin match Time.compare b1.timestamp b2.timestamp with | 0 -> Block_hash.compare b1.hash b2.hash | res -> res end | res -> res in let predecessor state b = if Block_hash.equal b.hash b.pred then Lwt.return None else read state b.pred >|= function | None | Some (Error _) -> None | Some (Ok b) -> Some b in iter_predecessors compare predecessor (fun b -> b.timestamp) (fun b -> b.fitness) end module Blockchain = struct let use state f = Persist.use state.blockchain_state f let update state f = Persist.update state.blockchain_state f let read_state, store_state = let current_block_key = ["current_block"] in let module Mempool_key = struct include Operation_hash let prefix = ["mempool"] let length = path_len end in let module Mempool = Persist.MakeBufferedPersistentSet (Store.Faked_functional_store) (Mempool_key) (Operation_hash_set) in let read genesis gstore sstore (vstate: valid_block_state) = begin Valid_block.locked_read vstate genesis.Store.block >>= function | None | Some (Error _) -> fatal_error "" | Some (Ok genesis_block) -> match genesis_block.test_network with | None -> Lwt.return genesis_block | Some _ -> let context = genesis_block.context in Context.del_test_network context >>= fun context -> Context.set_protocol context genesis_block.test_protocol_hash >>= fun context -> Lwt.return { genesis_block with net_id = Net genesis_block.hash ; context ; protocol = genesis_block.test_protocol ; protocol_hash = genesis_block.test_protocol_hash ; test_network = None ; } end >>= fun genesis_block -> begin Persist.use gstore (fun store -> Store.get store current_block_key) >>= function | None -> Lwt.return genesis.Store.block | Some current_block -> Lwt.return (Block_hash.of_bytes current_block) end >>= fun current_head_hash -> begin if Block_hash.equal current_head_hash genesis_block.hash then Lwt.return genesis_block else Valid_block.locked_read vstate current_head_hash >>= function | None -> fatal_error "Internal error while loading the current block." | Some (Error exn) -> fatal_error "@[Internal error while loading the current block:@ %a@]" (fun ppf -> Error_monad.pp_print_error ppf) exn | Some (Ok current_head) -> Lwt.return current_head end >>= fun current_head -> Persist.use gstore Mempool.read >>= fun mempool -> let current_protocol = match current_head.protocol with | None -> fatal_error "Protocol version for the current head is unknown" | Some protocol -> protocol in Lwt.return (Persist.share { current_head ; current_protocol ; genesis_block ; mempool ; blockchain_store = sstore }) in let store net { current_head ; mempool } = Persist.update net.net_store.net_store (fun store -> Store.set store current_block_key (Block_hash.to_bytes current_head.hash) >>= fun () -> Mempool.write store mempool >>= fun store -> Lwt.return (Some store)) >>= fun _ -> Lwt.return_unit in (read, store) let locked_head bstate = Lwt.return bstate.current_head let locked_protocol bstate = Lwt.return bstate.current_protocol let locked_mem (bstate : blockchain_state) store h = let genesis = bstate.genesis_block.hash in if Block_hash.equal genesis h then Lwt.return true else Store.Blockchain.mem store h let genesis net = use net (fun vstate -> Lwt.return vstate.genesis_block) let head net = use net locked_head let protocol net = use net locked_protocol let mem net h = use net (fun bstate -> Persist.use bstate.blockchain_store (fun store -> locked_mem bstate store h)) let find_new net hist sz = let rec path net_id store sz acc h = if sz <= 0 then return (List.rev acc) else Store.Blockchain_succ.get store h >>= function | None -> return (List.rev acc) | Some s -> path net_id store (sz-1) (s :: acc) s in let rec common_ancestor (bstate: blockchain_state) store hist = match hist with | [] -> Lwt.return bstate.genesis_block.hash | h :: hist -> locked_mem bstate store h >>= function | false -> common_ancestor bstate store hist | true -> Lwt.return h in use net (fun bstate -> Persist.use bstate.blockchain_store (fun store -> common_ancestor bstate store hist >>= fun ancestor -> let net_id = Net bstate.genesis_block.hash in if Block_hash.equal ancestor bstate.genesis_block.hash then Store.Blockchain_test_succ.get store ancestor >>= function | None -> if Block_hash.equal ancestor bstate.current_head.hash then return [] else return [ancestor] | Some s -> path net_id store (sz-1) [ancestor] s else path net_id store sz [] ancestor )) let pop_block state bstate = lwt_debug "pop_block %a" Block_hash.pp_short bstate.current_head.hash >>= fun () -> Valid_block.read_exn state bstate.current_head.pred >>= fun pred_block -> Persist.use bstate.blockchain_store (fun sstore -> Store.Blockchain.del sstore bstate.current_head.hash >>= fun () -> if Block_hash.equal pred_block.hash bstate.genesis_block.hash then Store.Blockchain_test_succ.del sstore pred_block.hash else Store.Blockchain_succ.del sstore pred_block.hash) >>= fun () -> let mempool = List.fold_left (fun mempool h -> Operation_hash_set.add h mempool) bstate.mempool bstate.current_head.operations in Lwt.return { bstate with current_head = pred_block ; mempool } let rec pop_blocks state bstate ancestor = if not (Block_hash.equal bstate.current_head.hash ancestor) then begin pop_block state bstate >>= fun bstate -> pop_blocks state bstate ancestor end else Lwt.return bstate let push_block time (bstate: blockchain_state) (block: valid_block) = lwt_debug "push_block %a" Block_hash.pp_short block.hash >>= fun () -> Persist.use bstate.blockchain_store (fun sstore -> Store.Blockchain.set sstore block.hash time >>= fun () -> if Block_hash.equal block.pred bstate.genesis_block.hash then Store.Blockchain_test_succ.set sstore block.pred block.hash else Store.Blockchain_succ.set sstore block.pred block.hash) >>= fun () -> let mempool = List.fold_left (fun mempool h -> Operation_hash_set.remove h mempool) bstate.mempool block.operations in Lwt.return { bstate with current_head = block ; mempool } let locked_set_head net bstate block = let Net net_id = block.net_id in if not (Block_hash.equal net_id net.net_store.net_genesis.block) then invalid_arg "State.Blockchain.set_head" ; lwt_debug "set_head %a" Block_hash.pp_short block.hash >>= fun () -> let current_protocol = match block.protocol with | None -> fatal_error "Protocol version for the new head is unknown" | Some protocol -> protocol in Valid_block.new_blocks net.state bstate.current_head block >>= fun (ancestor, path) -> pop_blocks net.state bstate ancestor.hash >>= fun bstate -> let time = Time.now () in Lwt_list.fold_left_s (push_block time) bstate path >>= fun bstate -> let bstate = { bstate with current_protocol } in store_state net bstate >>= fun () -> Lwt.return (Some bstate) let set_head net block = update net (fun bstate -> locked_set_head net bstate block) >>= fun _ -> Lwt.return_unit let test_and_set_head net ~old block = update net (fun bstate -> if not (Block_hash.equal bstate.current_head.hash old.hash) then Lwt.return None else locked_set_head net bstate block) end module Mempool = struct let use = Blockchain.use let update = Blockchain.update let get net = use net (fun bstate -> Lwt.return bstate.mempool) let add net h = update net (fun bstate -> if Operation_hash_set.mem h bstate.mempool then Lwt.return_none else begin let bstate = { bstate with mempool = Operation_hash_set.add h bstate.mempool } in Lwt.return (Some bstate) end) let remove net h = update net (fun bstate -> if Operation_hash_set.mem h bstate.mempool then begin let bstate = { bstate with mempool = Operation_hash_set.remove h bstate.mempool } in Lwt.return (Some bstate) end else Lwt.return_none) let for_block net block = let rec pop acc ancestor block = if Block_hash.equal ancestor.hash block.hash then Lwt.return acc else begin let acc = let add acc x = Operation_hash_set.add x acc in List.fold_left add acc block.operations in Valid_block.read_exn net.state block.pred >>= fun pred -> pop acc ancestor pred end in use net (fun bstate -> Valid_block.new_blocks net.state bstate.current_head block >>= fun (ancestor, path) -> pop bstate.mempool ancestor bstate.current_head >|= fun ops -> List.fold_left (fun ops (b: valid_block) -> let del acc x = Operation_hash_set.remove x acc in List.fold_left del ops b.operations) ops path) end module Net = struct type t = net type net = t module Blockchain = Blockchain module Mempool = Mempool let raw_create state (net_store : Store.net_store) = Persist.use state.valid_block_state (fun vstate -> Blockchain.read_state net_store.net_genesis net_store.net_store state.store.blockchain vstate) >|= fun blockchain_state -> { state ; net_store ; blockchain_state } let read_state, store_state = let read state store = Persist.use store.Store.global_store KnownNets.read >>= fun nets -> let elements = Block_hash_set.elements nets in Lwt_list.iter_p (fun hash -> store.net_read (Net hash) >>= function | Error err -> lwt_log_error "@[Error while loading net:@ %a@]" Error_monad.pp_print_error err | Ok net_store -> raw_create state net_store >>= fun net -> Block_hash_table.add state.nets hash net ; Lwt.return () ) elements in let store { store = { global_store }; nets } = Persist.update global_store (fun store -> let nets = Block_hash_table.fold (fun h _ s -> Block_hash_set.add h s) nets Block_hash_set.empty in KnownNets.write store nets >>= fun store -> Lwt.return (Some store)) >>= fun _ -> Lwt.return_unit in (read, store) let state { state } = state let active { active_net } = active_net let get { nets } (Net b) = try ok (Block_hash_table.find nets b) with Not_found -> error (Unknown_network (Net b)) let all { nets } = Block_hash_table.fold (fun _ net acc -> net :: acc) nets [] let id { net_store = { net_genesis = { block } } } = Net block let expiration { net_store = { net_expiration } } = net_expiration let same_id (Net id') net = let Net id = id net in Block_hash.equal id id' let is_active { active_net } net_id = List.exists (same_id net_id) active_net let activate net = let s = net.state in let net_id = id net in if not (List.exists (same_id net_id) s.active_net) then s.active_net <- net :: s.active_net let deactivate net = let s = net.state in let net_id = id net in s.active_net <- List.filter (fun net -> not (same_id net_id net)) s.active_net let create state ?expiration ?test_protocol net_genesis = Valid_block.create_genesis_block state net_genesis test_protocol >>=? fun _ -> state.store.net_init ?expiration net_genesis >>= fun net_store -> raw_create state net_store >>= fun net -> store_state state >>= fun () -> Block_hash_table.add state.nets net_genesis.block net ; return net let cleanup_blocks_and_operations net = let Net net_id = id net in let same_id (Net id) = Block_hash.equal net_id id in let cleanup_operation h = ignore @@ Persist.use net.state.store.operation (fun store -> Store.Operation.del store h) in let rec cleanup_block h = Block.read net.state h >>= function | Some b when same_id b.data.shell.net_id -> Persist.use net.state.store.block (fun store -> Store.Block.del store h) >>= fun () -> List.iter cleanup_operation b.data.shell.operations ; cleanup_block b.data.shell.predecessor ; | None | Some _ -> Lwt.return_unit in Mempool.get net >>= fun ops -> Operation_hash_set.iter cleanup_operation ops ; Valid_block.postponed net.state >>= fun postponed -> Block_hash_set.iter (fun h -> ignore (cleanup_block h)) postponed ; Valid_block.known_heads net.state >>= fun known_heads -> Block_hash_map.iter (fun _ v -> if same_id v.net_id then ignore @@ begin Persist.use net.state.store.block (fun store -> Store.Block.del store v.hash) >>= fun () -> cleanup_block v.pred end) known_heads ; Lwt.return_unit let destroy net = lwt_debug "destroy %a" Store.pp_net_id (id net) >>= fun () -> let Net net_genesis as net_id = id net in Block_hash_table.remove net.state.nets net_genesis ; net.state.active_net <- List.filter (fun net -> id net <> net_id) net.state.active_net ; store_state net.state >>= fun () -> net.state.store.net_destroy net.net_store >>= fun () -> Lwt.async (fun () -> cleanup_blocks_and_operations net); Lwt.return_unit end let () = let open Data_encoding in register_error_kind `Permanent ~id:"refusedOperation" ~title: "Refused operation" ~description: "An operation that will never be accepted (by any protocol version)." ~pp:(fun ppf hash -> Format.fprintf ppf "Refused operation %a" Operation_hash.pp_short hash) (obj1 (req "operation_hash" Operation_hash.encoding)) (function Exn (Operation.Invalid (hash, _)) -> Some hash | _ -> None) (fun hash -> Exn (Operation.Invalid (hash, [(* TODO *)]))) let () = let open Data_encoding in register_error_kind `Permanent ~id: "invalidBlock" ~title: "Invalid block" ~description: "The economical protocol refused to validate the block." ~pp:(fun ppf block_hash -> Format.fprintf ppf "Cannot validate the block %a" Block_hash.pp_short block_hash) (obj1 (req "block_hash" Block_hash.encoding)) (function Exn (Valid_block.Invalid (block_hash, _)) -> Some block_hash | _ -> None) (fun block_hash -> Exn (Valid_block.Invalid (block_hash, [(* TODO *)]))) (** Whole protocol state : read and store. *) let read ~request_operations ~request_blocks ~store_root ~context_root ~ttl ?patch_context () = Store.init store_root >>= fun store -> lwt_log_info "Initialising the distributed database..." >>= fun () -> let operation_db = Db_proxy.Operation.create { request_operations } store.operation in let block_db = Db_proxy.Block.create { request_blocks } store.block in Valid_block.create ?patch_context ~context_root store.global_store block_db ttl >>= fun valid_block_state -> let rec state = { store ; active_net = [] ; nets = Block_hash_table.create 7 ; operation_db ; operation_watchers = ref [] ; block_db ; block_watchers = ref [] ; valid_block_state ; } in Net.read_state state store >>= fun _nets -> Lwt.return state let store state = let nets = Block_hash_table.fold (fun _ net acc -> net :: acc) state.nets [] in Net.store_state state >>= fun () -> Lwt_list.iter_s (fun net -> Blockchain.use net (fun bstate -> Blockchain.store_state net bstate)) nets let shutdown state = Lwt.join [ Db_proxy.Operation.shutdown state.operation_db ; Db_proxy.Block.shutdown state.block_db ; ] >>= fun () -> store state