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postgres_dbprovider.go
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postgres_dbprovider.go
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package db_provider
import (
"bytes"
"context"
"database/sql"
"errors"
"fmt"
"net/url"
"strconv"
"strings"
"github.com/prebid/prebid-server/v2/config"
)
type PostgresDbProvider struct {
cfg config.DatabaseConnection
db *sql.DB
}
func (provider *PostgresDbProvider) Config() config.DatabaseConnection {
return provider.cfg
}
func (provider *PostgresDbProvider) Open() error {
connStr, err := provider.ConnString()
if err != nil {
return err
}
db, err := sql.Open(provider.cfg.Driver, connStr)
if err != nil {
return err
}
provider.db = db
return nil
}
func (provider *PostgresDbProvider) Close() error {
if provider.db != nil {
db := provider.db
provider.db = nil
return db.Close()
}
return nil
}
func (provider *PostgresDbProvider) Ping() error {
return provider.db.Ping()
}
func (provider *PostgresDbProvider) ConnString() (string, error) {
buffer := bytes.NewBuffer(nil)
buffer.WriteString("postgresql://")
if provider.cfg.Username != "" {
buffer.WriteString(provider.cfg.Username)
if provider.cfg.Password != "" {
buffer.WriteString(":")
buffer.WriteString(url.QueryEscape(provider.cfg.Password))
}
buffer.WriteString("@")
}
if provider.cfg.Host != "" {
buffer.WriteString(provider.cfg.Host)
}
if provider.cfg.Port > 0 {
buffer.WriteString(":")
buffer.WriteString(strconv.Itoa(provider.cfg.Port))
}
if provider.cfg.Database != "" {
buffer.WriteString("/")
buffer.WriteString(provider.cfg.Database)
}
queryStr, err := provider.generateQueryString()
if err != nil {
return "", err
}
if queryStr != "" {
buffer.WriteString("?")
buffer.WriteString(queryStr)
}
return buffer.String(), nil
}
func (provider *PostgresDbProvider) generateQueryString() (string, error) {
isTlsInConfigStruct := provider.cfg.TLS.RootCert != "" ||
provider.cfg.TLS.ClientCert != "" ||
provider.cfg.TLS.ClientKey != ""
isTlsInQueryString := strings.Contains(provider.cfg.QueryString, "sslrootcert=") ||
strings.Contains(provider.cfg.QueryString, "sslcert=") ||
strings.Contains(provider.cfg.QueryString, "sslkey=")
if isTlsInConfigStruct && isTlsInQueryString {
return "", errors.New("TLS cert information must either be specified in the TLS object or the query string but not both.")
}
sslmode := "disable"
sslrootcert := ""
sslcert := ""
sslkey := ""
queryString := ""
if provider.cfg.TLS.RootCert != "" {
sslmode = "verify-ca"
sslrootcert = fmt.Sprintf("&sslrootcert=%s", provider.cfg.TLS.RootCert)
if provider.cfg.TLS.ClientCert != "" && provider.cfg.TLS.ClientKey != "" {
sslmode = "verify-full"
sslcert = fmt.Sprintf("&sslcert=%s", provider.cfg.TLS.ClientCert)
sslkey = fmt.Sprintf("&sslkey=%s", provider.cfg.TLS.ClientKey)
}
}
sslmode = fmt.Sprintf("&sslmode=%s", sslmode)
if len(provider.cfg.QueryString) != 0 {
queryString = fmt.Sprintf("&%s", provider.cfg.QueryString)
if strings.Contains(provider.cfg.QueryString, "sslmode=") {
sslmode = ""
}
}
params := strings.Join([]string{sslmode, sslrootcert, sslcert, sslkey, queryString}, "")
return params[1:], nil
}
func (provider *PostgresDbProvider) PrepareQuery(template string, params ...QueryParam) (query string, args []interface{}) {
query = template
args = []interface{}{}
for _, param := range params {
switch v := param.Value.(type) {
case []interface{}:
idList := v
idListStr := provider.createIdList(len(args), len(idList))
args = append(args, idList...)
query = strings.Replace(query, "$"+param.Name, idListStr, -1)
default:
args = append(args, param.Value)
query = strings.Replace(query, "$"+param.Name, fmt.Sprintf("$%d", len(args)), -1)
}
}
return
}
func (provider *PostgresDbProvider) QueryContext(ctx context.Context, template string, params ...QueryParam) (*sql.Rows, error) {
query, args := provider.PrepareQuery(template, params...)
return provider.db.QueryContext(ctx, query, args...)
}
func (provider *PostgresDbProvider) createIdList(numSoFar int, numArgs int) string {
// Any empty list like "()" is illegal in Postgres. A (NULL) is the next best thing,
// though, since `id IN (NULL)` is valid for all "id" column types, and evaluates to an empty set.
//
// The query plan also suggests that it's basically free:
//
// explain SELECT id, requestData FROM stored_requests WHERE id in $ID_LIST;
//
// QUERY PLAN
// -------------------------------------------
// Result (cost=0.00..0.00 rows=0 width=16)
// One-Time Filter: false
// (2 rows)
if numArgs == 0 {
return "(NULL)"
}
final := bytes.NewBuffer(make([]byte, 0, 2+4*numArgs))
final.WriteString("(")
for i := numSoFar + 1; i < numSoFar+numArgs; i++ {
final.WriteString("$")
final.WriteString(strconv.Itoa(i))
final.WriteString(", ")
}
final.WriteString("$")
final.WriteString(strconv.Itoa(numSoFar + numArgs))
final.WriteString(")")
return final.String()
}