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db_exec.go
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db_exec.go
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package gonymizer
import (
"bytes"
"fmt"
"io"
"os"
"os/exec"
"path/filepath"
"strings"
log "github.com/sirupsen/logrus"
"github.com/spf13/viper"
)
// DropDatabase will drop the database that is supplied in the PGConfig.
func DropDatabase(conf PGConfig) error {
origName := conf.DefaultDBName
conf.DefaultDBName = "postgres"
dburl := conf.BaseURI()
conf.DefaultDBName = origName
cmd := "psql"
args := []string{
dburl,
"-v", "ON_ERROR_STOP=1",
"-c", // run a command
"DROP DATABASE IF EXISTS " + conf.DefaultDBName + ";",
}
err := ExecPostgresCmd(cmd, args...)
if err != nil {
log.Error(err)
log.Debug("dburl: ", dburl)
return err
}
return nil
}
// DropPublicTables drops all tables in the public schema.
func DropPublicTables(conf PGConfig) error {
tablenames, err := GetAllTablesInSchema(conf, "public")
if err != nil {
log.Error(err)
return err
}
dropStatements := []string{}
for _, tablename := range tablenames {
dropStatements = append(dropStatements, fmt.Sprintf("DROP TABLE IF EXISTS \"%s\" CASCADE;", tablename))
}
dropAll := strings.Join(dropStatements, " ")
cmd := "psql"
args := []string{
conf.URI(),
"-v", "ON_ERROR_STOP=1",
"-c", // run a command
dropAll,
}
err = ExecPostgresCmd(cmd, args...)
if err != nil {
log.Error(err)
log.Error("conf: ", conf)
return err
}
return nil
}
// CreateDatabase will create the database that is supplied in the PGConfig.
func CreateDatabase(conf PGConfig) error {
origName := conf.DefaultDBName
// Always use postgres database when moving, creating, or destroying databases
conf.DefaultDBName = "postgres"
dburl := conf.URI()
conf.DefaultDBName = origName
cmd := "psql"
args := []string{
dburl,
"-v", "ON_ERROR_STOP=1",
"-c", // run a command
"CREATE DATABASE " + conf.DefaultDBName + ";",
}
err := ExecPostgresCmd(cmd, args...)
if err != nil {
log.Error(err)
log.Debug("dburl: ", dburl)
return err
}
return nil
}
// SQLCommandFile will run psql -f on a file and execute any queries contained in the sql file. If ignoreErrors is
// supplied then psql will ignore errors in the file.
func SQLCommandFile(conf PGConfig, filepath string, ignoreErrors bool) error {
dburl := conf.URI()
cmd := "psql"
args := []string{
dburl,
}
// Should we quit on error?
if !ignoreErrors {
args = append(args, "-v", "ON_ERROR_STOP=1")
}
// Add the file to load last
args = append(args, "-f", filepath)
err := ExecPostgresCmd(cmd, args...)
if err != nil {
log.Error(err)
log.Debug("dburl: ", dburl)
return err
}
return nil
}
// ExecPostgresCmd executes the psql command, but first opens the db_test_*.log log files for debugging runtime
// issues using the psql command.
func ExecPostgresCmd(name string, args ...string) error {
outLog := "db_test_out.log"
outputFile, err := os.OpenFile(outLog, os.O_RDWR|os.O_APPEND|os.O_CREATE, 0660)
if err != nil {
log.Error(err)
log.Debug("outputFile: ", outLog)
log.Debug("name: ", name)
log.Debug("args: ", args)
return err
}
defer outputFile.Close()
errLog := "db_test_err.log"
errorFile, err := os.OpenFile(errLog, os.O_RDWR|os.O_APPEND|os.O_CREATE, 0660)
if err != nil {
log.Error(err)
log.Debug("errorFile: ", errLog)
log.Debug("name: ", name)
log.Debug("args: ", args)
return err
}
defer errorFile.Close()
return ExecPostgresCommandOutErr(outputFile, errorFile, name, args...)
}
// ExecPostgresCommandOutErr is the executing function for the psql -f command. It also closed the loaded files/buffers
// from the calling functions.
func ExecPostgresCommandOutErr(stdOut, stdErr io.Writer, name string, arg ...string) error {
var err error
pgBinDir := viper.GetString("PG_BIN_DIR")
if len(pgBinDir) > 0 {
name = filepath.Join(pgBinDir, name)
}
cmd := exec.Command(name, arg...)
cmd.Env = append(os.Environ())
// we use buffers cause we want the output to go to two places...
var outBuffer bytes.Buffer
var errBuffer bytes.Buffer
cmd.Stdout = &outBuffer
cmd.Stderr = &errBuffer
log.Debugf("Running command: %s %s", name, strings.Join(arg, " "))
err = cmd.Run()
outBytes := outBuffer.Bytes()
errBytes := errBuffer.Bytes()
stdOut.Write(outBytes)
stdErr.Write(errBytes)
if err != nil {
log.Error(err)
log.Debug("name: ", name)
log.Debug("arg: ", arg)
if len(errBytes) > 0 {
log.Debugf("errBytes: \n=====================\n%s\n=====================\n", string(errBytes))
log.Debugf("errBytes: \n=====================\n%s\n=====================\n", string(errBytes))
}
if len(outBytes) > 0 {
log.Debugf("outBytes: \n=====================\n%s\n=====================\n", string(outBytes))
log.Debugf("outBytes: \n=====================\n%s\n=====================\n", string(outBytes))
}
}
return err
}