package tezos-context

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Generic interface
Accessing and Updating Versions
Hash version
Predefined Fields
Context dumping

tezos-context
- Tezos_context
  - Context
    
    Checks
    
    Index
    
    Integrity_check
    
    Stat
    
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    Integrity_check_index
    
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tezos-context.encoding
- Tezos_context_encoding
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tezos-context.helpers
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tezos-context.memory
- Tezos_context_memory
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tezos-context.sigs
- Tezos_context_sigs
  - Context
    
    HASH_VERSION
    
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    VIEW

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Module
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Class type

Tezos - Versioned, block indexed (key x value) store

type Tezos_base__TzPervasives.error +=

| Cannot_create_file of string
| Cannot_open_file of string
| Cannot_find_protocol
| Suspicious_file of int

Generic interface

module type S = sig ... end

include S

include Tezos_context_sigs.Context.VIEW
  with type key = string list
   and type value = bytes

type t

The type for context views.

type key = string list

The type for context keys.

type value = bytes

The type for context values.

type tree

The type for context trees.

Getters

val mem : t -> key -> bool Lwt.t

mem t k is an Lwt promise that resolves to true iff k is bound to a value in t.

val mem_tree : t -> key -> bool Lwt.t

mem_tree t k is like mem but for trees.

val find : t -> key -> value option Lwt.t

find t k is an Lwt promise that resolves to Some v if k is bound to the value v in t and None otherwise.

val find_tree : t -> key -> tree option Lwt.t

find_tree t k is like find but for trees.

val list : t -> ?offset:int -> ?length:int -> key -> (string * tree) list Lwt.t

list t key is the list of files and sub-nodes stored under k in t. The result order is not specified but is stable.

offset and length are used for pagination.

Setters

val add : t -> key -> value -> t Lwt.t

add t k v is an Lwt promise that resolves to c such that:

k is bound to v in c;
and c is similar to t otherwise.

If k was already bound in t to a value that is physically equal to v, the result of the function is a promise that resolves to t. Otherwise, the previous binding of k in t disappears.

val add_tree : t -> key -> tree -> t Lwt.t

add_tree is like add but for trees.

val remove : t -> key -> t Lwt.t

remove t k v is an Lwt promise that resolves to c such that:

k is unbound in c;
and c is similar to t otherwise.

Folding

val fold : 
  ?depth:Tezos_context_sigs.Context.depth ->
  t ->
  key ->
  order:[ `Sorted | `Undefined ] ->
  init:'a ->
  f:(key -> tree -> 'a -> 'a Lwt.t) ->
  'a Lwt.t

fold ?depth t root ~order ~init ~f recursively folds over the trees and values of t. The f callbacks are called with a key relative to root. f is never called with an empty key for values; i.e., folding over a value is a no-op.

The depth is 0-indexed. If depth is set (by default it is not), then f is only called when the conditions described by the parameter is true:

Eq d folds over nodes and contents of depth exactly d.
Lt d folds over nodes and contents of depth strictly less than d.
Le d folds over nodes and contents of depth less than or equal to d.
Gt d folds over nodes and contents of depth strictly more than d.
Ge d folds over nodes and contents of depth more than or equal to d.

If order is `Sorted (the default), the elements are traversed in lexicographic order of their keys. For large nodes, it is memory-consuming, use `Undefined for a more memory efficient fold.

module Tree : sig ... end

type context = t

type index

A block-indexed (key x value) store directory.

val init : 
  ?patch_context:
    (context -> (context, Tezos_error_monad.TzCore.error list) result Lwt.t) ->
  ?readonly:bool ->
  string ->
  index Lwt.t

Open or initialize a versioned store at a given path.

val close : index -> unit Lwt.t

Close the index. Does not fail when the context is already closed.

val sync : index -> unit Lwt.t

Sync the context with disk. Only useful for read-only instances. Does not fail when the context is not in read-only mode.

val compute_testchain_chain_id : 
  Tezos_crypto.Block_hash.t ->
  Tezos_crypto.Chain_id.t

val compute_testchain_genesis : 
  Tezos_crypto.Block_hash.t ->
  Tezos_crypto.Block_hash.t

val commit_genesis : 
  index ->
  chain_id:Tezos_crypto.Chain_id.t ->
  time:Tezos_base.Time.Protocol.t ->
  protocol:Tezos_crypto.Protocol_hash.t ->
  (Tezos_crypto.Context_hash.t, Tezos_error_monad.TzCore.error list) result
    Lwt.t

val commit_test_chain_genesis : 
  context ->
  Tezos_base.Block_header.t ->
  Tezos_base.Block_header.t Lwt.t

val merkle_tree : 
  t ->
  Tezos_shell_services.Block_services.merkle_leaf_kind ->
  key ->
  Tezos_shell_services.Block_services.merkle_tree Lwt.t

merkle_tree t leaf_kind key returns a Merkle proof for key (i.e. whose hashes reach key). If leaf_kind is Block_services.Hole, the value at key is a hash. If leaf_kind is Block_services.Raw_context, the value at key is a Block_services.raw_context. Values higher in the returned tree are hashes of the siblings on the path to reach key.

Accessing and Updating Versions

val exists : index -> Tezos_crypto.Context_hash.t -> bool Lwt.t

val checkout : index -> Tezos_crypto.Context_hash.t -> context option Lwt.t

val checkout_exn : index -> Tezos_crypto.Context_hash.t -> context Lwt.t

val hash : 
  time:Tezos_base.Time.Protocol.t ->
  ?message:string ->
  t ->
  Tezos_crypto.Context_hash.t

val commit : 
  time:Tezos_base.Time.Protocol.t ->
  ?message:string ->
  context ->
  Tezos_crypto.Context_hash.t Lwt.t

val set_head : 
  index ->
  Tezos_crypto.Chain_id.t ->
  Tezos_crypto.Context_hash.t ->
  unit Lwt.t

val set_master : index -> Tezos_crypto.Context_hash.t -> unit Lwt.t

Hash version

val get_hash_version : context -> Tezos_crypto.Context_hash.Version.t

Get the hash version used for the context

val set_hash_version : 
  context ->
  Tezos_crypto.Context_hash.Version.t ->
  (context, Tezos_error_monad.TzCore.error list) result Lwt.t

Set the hash version used for the context. It may recalculate the hashes of the whole context, which can be a long process. Returns an Error if the hash version is unsupported.

Predefined Fields

val get_protocol : context -> Tezos_crypto.Protocol_hash.t Lwt.t

val add_protocol : context -> Tezos_crypto.Protocol_hash.t -> context Lwt.t

val get_test_chain : context -> Tezos_base.Test_chain_status.t Lwt.t

val add_test_chain : context -> Tezos_base.Test_chain_status.t -> context Lwt.t

val remove_test_chain : context -> context Lwt.t

val fork_test_chain : 
  context ->
  protocol:Tezos_crypto.Protocol_hash.t ->
  expiration:Tezos_base.Time.Protocol.t ->
  context Lwt.t

val clear_test_chain : index -> Tezos_crypto.Chain_id.t -> unit Lwt.t

val find_predecessor_block_metadata_hash : 
  context ->
  Tezos_crypto.Block_metadata_hash.t option Lwt.t

val add_predecessor_block_metadata_hash : 
  context ->
  Tezos_crypto.Block_metadata_hash.t ->
  context Lwt.t

val find_predecessor_ops_metadata_hash : 
  context ->
  Tezos_crypto.Operation_metadata_list_list_hash.t option Lwt.t

val add_predecessor_ops_metadata_hash : 
  context ->
  Tezos_crypto.Operation_metadata_list_list_hash.t ->
  context Lwt.t

Context dumping

val dump_context : 
  index ->
  Tezos_crypto.Context_hash.t ->
  fd:Lwt_unix.file_descr ->
  (int, Tezos_error_monad.TzCore.error list) result Lwt.t

val restore_context : 
  index ->
  expected_context_hash:Tezos_crypto.Context_hash.t ->
  nb_context_elements:int ->
  fd:Lwt_unix.file_descr ->
  (unit, Tezos_error_monad.TzCore.error list) result Lwt.t

val retrieve_commit_info : 
  index ->
  Tezos_base.Block_header.t ->
  (Tezos_crypto.Protocol_hash.t
   * string
   * string
   * Tezos_base.Time.Protocol.t
   * Tezos_base.Test_chain_status.t
   * Tezos_crypto.Context_hash.t
   * Tezos_crypto.Block_metadata_hash.t option
   * Tezos_crypto.Operation_metadata_list_list_hash.t option
   * Tezos_crypto.Context_hash.t list,
    Tezos_error_monad.TzCore.error list)
    result
    Lwt.t

val check_protocol_commit_consistency : 
  index ->
  expected_context_hash:Tezos_crypto.Context_hash.t ->
  given_protocol_hash:Tezos_crypto.Protocol_hash.t ->
  author:string ->
  message:string ->
  timestamp:Tezos_base.Time.Protocol.t ->
  test_chain_status:Tezos_base.Test_chain_status.t ->
  predecessor_block_metadata_hash:Tezos_crypto.Block_metadata_hash.t option ->
  predecessor_ops_metadata_hash:
    Tezos_crypto.Operation_metadata_list_list_hash.t option ->
  data_merkle_root:Tezos_crypto.Context_hash.t ->
  parents_contexts:Tezos_crypto.Context_hash.t list ->
  bool Lwt.t

module Checks : sig ... end

Offline integrity checking and statistics for contexts.