watcher: inital validator

This begin this code for the validator. Currently this just build an
array of the starting and ending missing trades.

TODO: Download the missing trades

cmd/watcher/main.go

@@ -35,6 +35,12 @@ func main() {
 		return
 	}
 
+	v := validator{}
+	v.db = db
+	v.logger = logger
+	v.validate("ETH-USD", "BTC-USD")
+	v.stop()
+
 	t := make(chan bool)
 	<-t
 }

cmd/watcher/validator.go

@@ -0,0 +1,80 @@
+package main
+
+import (
+	"github.com/kcotugno/tacitus"
+
+	"time"
+)
+
+type validator struct {
+	db     tacitus.DatabaseClientService
+	logger tacitus.Logger
+
+	ticker *time.Ticker
+	done   chan bool
+}
+
+func (v *validator) stop() {
+	if v.ticker == nil || v.stop == nil {
+		v.ticker.Stop()
+		v.done <- true
+	}
+}
+
+func (v *validator) validate(products ...string) {
+	v.ticker = time.NewTicker(10 * time.Minute)
+	v.done = make(chan bool)
+
+	go func() {
+		v.emit_products(products...)
+
+		var done bool
+
+		for !done {
+			select {
+			case <-v.done:
+				done = true
+			case <-v.ticker.C:
+				v.emit_products(products...)
+			}
+		}
+
+		v.ticker = nil
+		v.done = nil
+	}()
+}
+
+func (v *validator) emit_products(products ...string) {
+	for _, p := range products {
+		go v.validate_product(p)
+	}
+}
+
+func (v *validator) validate_product(product string) {
+	v.logger.Info("Staring validation of %v", product)
+
+	results, err := v.db.TradeService().TradesAfterAll(product, 0)
+	if err != nil {
+		v.logger.Info("Error getting all trades: %v", err)
+	}
+
+	var trade tacitus.Trade
+	current := 0
+	missing := [][]int{}
+	for results.Next() {
+
+		trade = results.Value().(tacitus.Trade)
+
+		if trade.TradeId != current+1 {
+			missing = append(missing, []int{current + 1, trade.TradeId - 1})
+		}
+
+		current = trade.TradeId
+	}
+
+	for _, i := range missing {
+		v.logger.Info("%v", i)
+	}
+
+	v.logger.Info("DONE: %v", product)
+}

postgres/trade_result.go

@@ -0,0 +1,55 @@
+package postgres
+
+import (
+	"github.com/kcotugno/tacitus"
+
+	"database/sql"
+	"errors"
+)
+
+type TradeResults struct {
+	rows  *sql.Rows
+	trade tacitus.Trade
+	err   error
+}
+
+func (r *TradeResults) Next() bool {
+	var t tacitus.Trade
+	var done bool
+
+	if r.rows == nil {
+		r.err = errors.New("No query results")
+		return false
+	}
+
+	if r.rows.Next() {
+		r.err = r.rows.Scan(&t.Id, &t.TradeId, &t.Product, &t.Price, &t.Size,
+			&t.Buy, &t.Sell, &t.Timestamp)
+		r.trade = t
+	} else {
+		done = true
+		r.err = r.rows.Err()
+	}
+
+	if r.err == nil && !done {
+		return true
+	} else {
+		return false
+	}
+}
+
+func (r *TradeResults) Value() interface{} {
+	return r.trade
+}
+
+func (r *TradeResults) Error() error {
+	return r.err
+}
+
+func (r *TradeResults) Close() error {
+	if r.rows != nil {
+		return r.rows.Close()
+	}
+
+	return nil
+}

postgres/trade_service.go

@@ -1,10 +1,10 @@
 package postgres
 
 import (
+	"github.com/kcotugno/tacitus"
+
 	"database/sql"
 	"time"
-
-	"github.com/kcotugno/tacitus"
 )
 
 const (
@@ -25,6 +25,9 @@ const (
 		`WHERE product = $1 AND trade_id < $2 ORDER BY trade_id DESC LIMIT $3;`
 	trade_before = `SELECT id, ` + trade_columns + ` FROM trades ` +
 		`WHERE product = $1 AND trade_id > $2 ORDER BY trade_id ASC LIMIT $3;`
+	trade_product   = `SELECT DISTINCT product FROM trades;`
+	trade_after_all = `SELECT id,` + trade_columns + `FROM trades WHERE product = $1 ` +
+		`AND trade_id > $2 ORDER BY trade_id ASC;`
 )
 
 type TradeService struct {
@@ -153,6 +156,44 @@ func (s *TradeService) TradesBefore(product string, id, limit int) ([]tacitus.Tr
 
 }
 
+func (s *TradeService) TradeProducts() ([]string, error) {
+	s.client.logQuery(trade_product)
+	rows, err := s.client.db.Query(trade_product)
+	if err != nil {
+		s.client.logError(trade_product, err)
+
+		return nil, err
+	}
+
+	products := []string{}
+	for rows.Next() {
+		var p string
+		if err = rows.Scan(&p); err != nil {
+			s.client.logError(trade_product, err)
+
+			return nil, err
+		}
+
+		products = append(products, p)
+	}
+
+	return products, nil
+}
+
+func (s *TradeService) TradesAfterAll(product string, id int) (tacitus.Results, error) {
+	s.client.logQuery(trade_after_all, product, id)
+	rows, err := s.client.db.Query(trade_after_all, product, id)
+	if err != nil {
+		s.client.logError(trade_after_all, err, product, id)
+		return nil, err
+	}
+
+	results := TradeResults{}
+	results.rows = rows
+
+	return &results, nil
+}
+
 func deserializeTrades(rows *sql.Rows) ([]tacitus.Trade, error) {
 	defer rows.Close()
 

results.go

@@ -0,0 +1,8 @@
+package tacitus
+
+type Results interface {
+	Next() bool
+	Value() interface{}
+	Error() error
+	Close() error
+}

trade.go

@@ -32,11 +32,7 @@ type TradeService interface {
 	TradesAfter(product string, id, limit int) ([]Trade, error)
 	TradesBefore(product string, id, limit int) ([]Trade, error)
 
-	TradesAfterAll(product string, id int) error
-
-	Next() (Trade, error)
-	Done() bool
-	CloseRows() error
+	TradesAfterAll(product string, id int) (Results, error)
 }
 
 func ValidProduct(prod string) bool {