mirror of
git://jb55.com/damus
synced 2024-09-30 00:40:45 +00:00
ndb: add NdbTxn transaction class
This will be used for transactions
This commit is contained in:
parent
9398877415
commit
622a436589
@ -156,6 +156,7 @@
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4C3BEFE0281DE1ED00B3DE84 /* DamusState.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4C3BEFDF281DE1ED00B3DE84 /* DamusState.swift */; };
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4C3D52B6298DB4E6001C5831 /* ZapEvent.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4C3D52B5298DB4E6001C5831 /* ZapEvent.swift */; };
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4C3D52B8298DB5C6001C5831 /* TextEvent.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4C3D52B7298DB5C6001C5831 /* TextEvent.swift */; };
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4C3DCC762A9FE9EC0091E592 /* NdbTxn.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4C3DCC752A9FC2030091E592 /* NdbTxn.swift */; };
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4C3EA63D28FF52D600C48A62 /* bolt11.c in Sources */ = {isa = PBXBuildFile; fileRef = 4C3EA63C28FF52D600C48A62 /* bolt11.c */; };
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4C3EA64128FF553900C48A62 /* hash_u5.c in Sources */ = {isa = PBXBuildFile; fileRef = 4C3EA64028FF553900C48A62 /* hash_u5.c */; };
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4C3EA64428FF558100C48A62 /* sha256.c in Sources */ = {isa = PBXBuildFile; fileRef = 4C3EA64328FF558100C48A62 /* sha256.c */; };
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@ -694,6 +695,7 @@
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4C3BEFDF281DE1ED00B3DE84 /* DamusState.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DamusState.swift; sourceTree = "<group>"; };
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4C3D52B5298DB4E6001C5831 /* ZapEvent.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ZapEvent.swift; sourceTree = "<group>"; };
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4C3D52B7298DB5C6001C5831 /* TextEvent.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TextEvent.swift; sourceTree = "<group>"; };
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4C3DCC752A9FC2030091E592 /* NdbTxn.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NdbTxn.swift; sourceTree = "<group>"; };
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4C3EA63B28FF52D600C48A62 /* bolt11.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = bolt11.h; sourceTree = "<group>"; };
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4C3EA63C28FF52D600C48A62 /* bolt11.c */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.c; path = bolt11.c; sourceTree = "<group>"; };
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4C3EA63E28FF54BD00C48A62 /* short_types.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = short_types.h; sourceTree = "<group>"; };
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@ -1816,6 +1818,7 @@
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4CDD1ADF2A6B305F001CD4DF /* NdbTagElem.swift */,
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4C478E242A9932C100489948 /* Ndb.swift */,
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4CDD1AE12A6B3074001CD4DF /* NdbTagsIterator.swift */,
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4C3DCC752A9FC2030091E592 /* NdbTxn.swift */,
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4CE9FBB82A6B3B26007E485C /* nostrdb.c */,
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4C4793032A993DB900489948 /* midl.c */,
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4C4793002A993B9A00489948 /* mdb.c */,
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@ -2478,6 +2481,7 @@
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isa = PBXSourcesBuildPhase;
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buildActionMask = 2147483647;
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files = (
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4C3DCC762A9FE9EC0091E592 /* NdbTxn.swift in Sources */,
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4CEF958D2A9CE650000F901B /* verifier.c in Sources */,
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4C32B9342A9AD01A00DC3548 /* NdbProfile.swift in Sources */,
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4C32B9332A99845B00DC3548 /* Ndb.swift in Sources */,
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102
nostrdb/NdbTxn.swift
Normal file
102
nostrdb/NdbTxn.swift
Normal file
@ -0,0 +1,102 @@
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//
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// NdbTx.swift
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// damus
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//
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// Created by William Casarin on 2023-08-30.
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//
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import Foundation
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#if TXNDEBUG
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fileprivate var txn_count: Int = 0
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#endif
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// Would use struct and ~Copyable but generics aren't supported well
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class NdbTxn<T> {
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var txn: ndb_txn
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private var val: T!
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var moved: Bool
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init(ndb: Ndb, with: (NdbTxn<T>) -> T) {
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self.txn = ndb_txn()
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#if TXNDEBUG
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txn_count += 1
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print("opening transaction \(txn_count)")
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#endif
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let _ = ndb_begin_query(ndb.ndb.ndb, &self.txn)
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self.moved = false
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self.val = with(self)
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}
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init(txn: ndb_txn, val: T) {
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self.txn = txn
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self.val = val
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self.moved = false
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}
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/// Only access temporarily! Do not store database references for longterm use. If it's a primitive type you
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/// can retrieve this value with `.value`
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var unsafeUnownedValue: T {
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precondition(!moved)
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return val
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}
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deinit {
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if !moved {
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#if TXNDEBUG
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txn_count -= 1;
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print("closing transaction \(txn_count)")
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#endif
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ndb_end_query(&self.txn)
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}
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}
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// functor
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func map<Y>(_ transform: (T) -> Y) -> NdbTxn<Y> {
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self.moved = true
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return .init(txn: self.txn, val: transform(val))
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}
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// comonad!?
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// useful for moving ownership of a transaction to another value
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func extend<Y>(_ with: (NdbTxn<T>) -> Y) -> NdbTxn<Y> {
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self.moved = true
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return .init(txn: self.txn, val: with(self))
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}
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}
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protocol OptionalType {
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associatedtype Wrapped
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var optional: Wrapped? { get }
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}
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extension Optional: OptionalType {
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typealias Wrapped = Wrapped
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var optional: Wrapped? {
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return self
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}
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}
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extension NdbTxn where T: OptionalType {
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func collect() -> NdbTxn<T.Wrapped>? {
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guard let unwrappedVal: T.Wrapped = val.optional else {
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return nil
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}
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self.moved = true
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return NdbTxn<T.Wrapped>(txn: self.txn, val: unwrappedVal)
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}
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}
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extension NdbTxn where T == Bool { var value: T { return self.unsafeUnownedValue } }
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extension NdbTxn where T == Bool? { var value: T { return self.unsafeUnownedValue } }
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extension NdbTxn where T == Int { var value: T { return self.unsafeUnownedValue } }
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extension NdbTxn where T == Int? { var value: T { return self.unsafeUnownedValue } }
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extension NdbTxn where T == Double { var value: T { return self.unsafeUnownedValue } }
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extension NdbTxn where T == Double? { var value: T { return self.unsafeUnownedValue } }
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extension NdbTxn where T == UInt64 { var value: T { return self.unsafeUnownedValue } }
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extension NdbTxn where T == UInt64? { var value: T { return self.unsafeUnownedValue } }
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extension NdbTxn where T == String { var value: T { return self.unsafeUnownedValue } }
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extension NdbTxn where T == String? { var value: T { return self.unsafeUnownedValue } }
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extension NdbTxn where T == NoteId? { var value: T { return self.unsafeUnownedValue } }
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extension NdbTxn where T == NoteId { var value: T { return self.unsafeUnownedValue } }
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