NosoNode

Unit Noso.Block

Description
Uses
Classes, Interfaces, Objects and Records
Functions and Procedures
Types
Constants
Variables

Description

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Uses

Overview

Classes, Interfaces, Objects and Records

Name Description
Packed Record BlockHeaderData  
Record TDBRecord  

Functions and Procedures

function AddRecordToDBFile(block, order, Source, target: Integer): Boolean;
procedure CreateDBFile();
function CreateOrderIDIndex(): Boolean;
function GetBlockFromOrder(OrderID: String): Integer;
function GetBlocksAsStream(out LMs: TMemoryStream; firstblock, CurrentLastblock: Integer): Int64;
function GetBlockTransfers(BlockNumber: Integer): TBlockOrders;
function GetDBLastBlock(): Integer;
function GetDBRecords(): Integer;
function GetMyLastUpdatedBlock(): Int64;
function GetOrderFromDB(OrderID: String; out OrderInfo: TOrderData): Boolean;
function InsertToIndex(LData: TDBRecord): Boolean;
function LoadBlockDataHeader(BlockNumber: Integer): BlockHeaderData;
function SaveStreamAsZipBlocks(const LStream: TMemoryStream): Boolean;
procedure SetBlockDirectory(NewFolder: String);
function UpdateBlockDatabase(): Boolean;

Types

IntArray = array of Integer;

Variables

BlockDirectory: String = 'NOSODATA' + DirectorySeparator + 'BLOCKS' + DirectorySeparator;
BlocksZipFile: String = 'blocks.zip';
DataBaseFilename: String = 'blocks_db.nos';
DBDirectory: String = 'DB' + DirectorySeparator;
DBFile: file of TDBRecord;
DBFileLock: TRTLCriticalSection;
DBIndexLock: TRTLCriticalSection;
OrderIDIndex: array of TindexRecord;

Description

Functions and Procedures

function AddRecordToDBFile(block, order, Source, target: Integer): Boolean;

Add a new record to the File and also to the index

procedure CreateDBFile();

Creates an empty DB file

function CreateOrderIDIndex(): Boolean;

Creates the INDEX from the file

function GetBlockFromOrder(OrderID: String): Integer;

Returns the block number where the order is found, or -1 if none

function GetBlocksAsStream(out LMs: TMemoryStream; firstblock, CurrentLastblock: Integer): Int64;

Creates the zip block file

function GetBlockTransfers(BlockNumber: Integer): TBlockOrders;

Return the array containing orders in the specified block

function GetDBLastBlock(): Integer;

Returns the last block on file

function GetDBRecords(): Integer;

Returns the records count on file

function GetMyLastUpdatedBlock(): Int64;

Returns the last downloaded block

function GetOrderFromDB(OrderID: String; out OrderInfo: TOrderData): Boolean;

Returns the order data from its orderID

function InsertToIndex(LData: TDBRecord): Boolean;

Insert a value on index

function LoadBlockDataHeader(BlockNumber: Integer): BlockHeaderData;

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function SaveStreamAsZipBlocks(const LStream: TMemoryStream): Boolean;

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procedure SetBlockDirectory(NewFolder: String);

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function UpdateBlockDatabase(): Boolean;

updates file and database to most recent block on disk

Types

IntArray = array of Integer;

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Variables

BlockDirectory: String = 'NOSODATA' + DirectorySeparator + 'BLOCKS' + DirectorySeparator;

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BlocksZipFile: String = 'blocks.zip';

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DataBaseFilename: String = 'blocks_db.nos';

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DBDirectory: String = 'DB' + DirectorySeparator;

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DBFile: file of TDBRecord;

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DBFileLock: TRTLCriticalSection;

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DBIndexLock: TRTLCriticalSection;

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OrderIDIndex: array of TindexRecord;

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