Feature: Data history manager engine subsystem (#693)

* Adds lovely initial concept for historical data doer

* Adds ability to save tasks. Adds config. Adds startStop to engine

* Has a database microservice without use of globals! Further infrastructure design. Adds readme

* Commentary to help design

* Adds migrations for database

* readme and adds database models

* Some modelling that doesn't work end of day

* Completes datahistoryjob sql.Begins datahistoryjobresult

* Adds datahistoryjob functions to retreive job results. Adapts subsystem

* Adds process for upserting jobs and job results to the database

* Broken end of day weird sqlboiler crap

* Fixes issue with SQL generation.

* RPC generation and addition of basic upsert command

* Renames types

* Adds rpc functions

* quick commit before context swithc. Exchanges aren't being populated

* Begin the tests!

* complete sql tests. stop failed jobs. CLI command creation

* Defines rpc commands

* Fleshes out RPC implementation

* Expands testing

* Expands testing, removes double remove

* Adds coverage of data history subsystem, expands errors and nil checks

* Minor logic improvement

* streamlines datahistory test setup

* End of day minor linting

* Lint, convert simplify, rpc expansion, type expansion, readme expansion

* Documentation update

* Renames for consistency

* Completes RPC server commands

* Fixes tests

* Speeds up testing by reducing unnecessary actions. Adds maxjobspercycle config

* Comments for everything

* Adds missing result string. checks interval supported. default start end cli

* Fixes ID problem. Improves binance trade fetch. job ranges are processed

* adds dbservice coverage. adds rpcserver coverage

* docs regen, uses dbcon interface, reverts binance, fixes races, toggle manager

* Speed up tests, remove bad global usage, fix uuid check

* Adds verbose. Updates docs. Fixes postgres

* Minor changes to logging and start stop

* Fixes postgres db tests, fixes postgres column typo

* Fixes old string typo,removes constraint,error parsing for nonreaders

* prevents dhm running when table doesn't exist. Adds prereq documentation

* Adds parallel, rmlines, err fix, comment fix, minor param fixes

* doc regen, common time range check and test updating

* Fixes job validation issues. Updates candle range checker.

* Ensures test cannot fail due to time.Now() shenanigans

* Fixes oopsie, adds documentation and a warn

* Fixes another time test, adjusts copy

* Drastically speeds up data history manager tests via function overrides

* Fixes summary bug and better logs

* Fixes local time test, fixes websocket tests

* removes defaults and comment,updates error messages,sets cli command args

* Fixes FTX trade processing

* Fixes issue where jobs got stuck if data wasn't returned but retrieval was successful

* Improves test speed. Simplifies trade verification SQL. Adds command help

* Fixes the oopsies

* Fixes use of query within transaction. Fixes trade err

* oopsie, not needed

* Adds missing data status. Properly ends job even when data is missing

* errors are more verbose and so have more words to describe them

* Doc regen for new status

* tiny test tinkering

* str := string("Removes .String()").String()

* Merge fixups

* Fixes a data race discovered during github actions

* Allows websocket test to pass consistently

* Fixes merge issue preventing datahistorymanager from starting via config

* Niterinos cmd defaults and explanations

* fixes default oopsie

* Fixes lack of nil protection

* Additional oopsie

* More detailed error for validating job exchange

database/database_types.go

@@ -1,6 +1,7 @@
 package database
 
 import (
+	"context"
 	"database/sql"
 	"errors"
 	"path/filepath"
@@ -39,11 +40,15 @@ var (
 	SupportedDrivers = []string{DBSQLite, DBSQLite3, DBPostgreSQL}
 	// ErrFailedToConnect for when a database fails to connect
 	ErrFailedToConnect = errors.New("database failed to connect")
+	// ErrDatabaseNotConnected for when a database is not connected
+	ErrDatabaseNotConnected = errors.New("database is not connected")
 	// DefaultSQLiteDatabase is the default sqlite3 database name to use
 	DefaultSQLiteDatabase = "gocryptotrader.db"
-	errNilConfig          = errors.New("received nil config")
-	errNilInstance        = errors.New("database instance is nil")
-	errNilSQL             = errors.New("database SQL connection is nil")
+	// ErrNilInstance for when a database is nil
+	ErrNilInstance = errors.New("database instance is nil")
+	errNilConfig   = errors.New("received nil config")
+	errNilSQL      = errors.New("database SQL connection is nil")
+	errFailedPing  = errors.New("unable to verify database is connected, failed ping")
 )
 
 const (
@@ -56,3 +61,23 @@ const (
 	// DBInvalidDriver const string for invalid driver
 	DBInvalidDriver = "invalid driver"
 )
+
+// IDatabase allows for the passing of a database struct
+// without giving the receiver access to all functionality
+type IDatabase interface {
+	IsConnected() bool
+	GetSQL() (*sql.DB, error)
+	GetConfig() *Config
+}
+
+// ISQL allows for the passing of a SQL connection
+// without giving the receiver access to all functionality
+type ISQL interface {
+	BeginTx(context.Context, *sql.TxOptions) (*sql.Tx, error)
+	Exec(string, ...interface{}) (sql.Result, error)
+	Query(string, ...interface{}) (*sql.Rows, error)
+	QueryRow(string, ...interface{}) *sql.Row
+	ExecContext(context.Context, string, ...interface{}) (sql.Result, error)
+	QueryContext(context.Context, string, ...interface{}) (*sql.Rows, error)
+	QueryRowContext(context.Context, string, ...interface{}) *sql.Row
+}