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

engine/subsystem_types.go

@@ -5,6 +5,7 @@ import (
 
 	"github.com/thrasher-corp/gocryptotrader/communications/base"
 	"github.com/thrasher-corp/gocryptotrader/currency"
+	"github.com/thrasher-corp/gocryptotrader/database"
 	exchange "github.com/thrasher-corp/gocryptotrader/exchanges"
 	"github.com/thrasher-corp/gocryptotrader/exchanges/asset"
 	"github.com/thrasher-corp/gocryptotrader/exchanges/order"
@@ -31,9 +32,11 @@ var (
 	// ErrSubSystemNotStarted message to return when subsystem not started
 	ErrSubSystemNotStarted = errors.New("subsystem not started")
 	// ErrNilSubsystem is returned when a subsystem hasn't had its Setup() func run
-	ErrNilSubsystem       = errors.New("subsystem not setup")
-	errNilWaitGroup       = errors.New("nil wait group received")
-	errNilExchangeManager = errors.New("cannot start with nil exchange manager")
+	ErrNilSubsystem                 = errors.New("subsystem not setup")
+	errNilWaitGroup                 = errors.New("nil wait group received")
+	errNilExchangeManager           = errors.New("cannot start with nil exchange manager")
+	errNilDatabaseConnectionManager = errors.New("cannot start with nil database connection manager")
+	errNilConfig                    = errors.New("received nil config")
 )
 
 // iExchangeManager limits exposure of accessible functions to exchange manager
@@ -83,3 +86,8 @@ type iCurrencyPairSyncer interface {
 	PrintOrderbookSummary(*orderbook.Base, string, error)
 	Update(string, currency.Pair, asset.Item, int, error) error
 }
+
+// iDatabaseConnectionManager defines a limited scoped databaseConnectionManager
+type iDatabaseConnectionManager interface {
+	GetInstance() database.IDatabase
+}