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markets.go
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markets.go
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// This code is available on the terms of the project LICENSE.md file,
// also available online at https://blueoakcouncil.org/license/1.0.0.
package pg
import (
"database/sql"
"fmt"
"strings"
"decred.org/dcrdex/dex"
"decred.org/dcrdex/server/db/driver/pg/internal"
)
func loadMarkets(db sqlQueryer, marketsTableName string) ([]*dex.MarketInfo, error) {
stmt := fmt.Sprintf(internal.SelectAllMarkets, marketsTableName)
rows, err := db.Query(stmt)
if err != nil {
return nil, err
}
defer rows.Close()
var mkts []*dex.MarketInfo
for rows.Next() {
var name string
var base, quote uint32
var lotSize uint64
err = rows.Scan(&name, &base, "e, &lotSize)
if err != nil {
return nil, err
}
mkts = append(mkts, &dex.MarketInfo{
Name: name,
Base: base,
Quote: quote,
LotSize: lotSize,
})
}
if err = rows.Err(); err != nil {
return nil, err
}
return mkts, nil
}
func newMarket(db *sql.DB, marketsTableName string, mkt *dex.MarketInfo) error {
stmt := fmt.Sprintf(internal.InsertMarket, marketsTableName)
res, err := db.Exec(stmt, mkt.Name, mkt.Base, mkt.Quote, mkt.LotSize)
if err != nil {
return err
}
N, err := res.RowsAffected()
if err != nil {
return err
}
if N != 1 {
return fmt.Errorf("failed to insert market, %d rows affected", N)
}
return nil
}
func createMarketTables(db *sql.DB, marketName string) error {
marketUID := marketSchema(marketName)
newMarket, err := createSchema(db, marketUID)
if err != nil {
return err
}
if newMarket {
log.Debugf("Created new market schema %q", marketUID)
} else {
log.Tracef("Market schema %q already exists.", marketUID)
}
for _, c := range createMarketTableStatements {
newTable, err := createTable(db, marketUID, c.name)
if err != nil {
return err
}
if newTable && !newMarket {
log.Warnf(`Created missing table "%s" for existing market %s.`,
c.name, marketUID)
}
}
return nil
}
// marketSchema replaces the special token symbol character '.' with the allowed
// PostgreSQL character '$'.
func marketSchema(marketName string) string {
return strings.ReplaceAll(marketName, ".", "TKN")
}