Writer (catapult-sqlite.Catapult

type t

DB writer. This holds a sqlite DB and writes new events to it.

val create : 
  ?sync:[ `OFF | `NORMAL | `FULL ] ->
  ?append:bool ->
  ?file:string ->
  ?trace_id:string ->
  ?dir:string ->
  unit ->
  t

Open writer into a database file.

parameter append
if true, append to existing records (default false)

parameter file
if provided, path to the file

parameter dir
directory into which to place the file if file not provided

parameter trace_id
basename for the file if file not provided

parameter sync
controls "PRAGMA SYNCHRONOUS". Default is `NORMAL which is safe; `OFF is much faster but might corrupt DB if the machin crashes. See https://sqlite.org/pragma.html#pragma_synchronous

val cycle_stmt : t -> unit

Close and recreate internal state.

val close : t -> unit

Close writer.

val with_ : 
  ?sync:[ `OFF | `NORMAL | `FULL ] ->
  ?append:bool ->
  ?file:string ->
  ?trace_id:string ->
  ?dir:string ->
  unit ->
  (t -> 'a) ->
  'a

val write_string_l : t -> string list -> unit

val write_string : t -> string -> unit

Send a json encoded event. Thread safe.