forked from sqls-server/sqls
/
postgresql.go
507 lines (465 loc) · 11.3 KB
/
postgresql.go
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package database
import (
"context"
"database/sql"
"fmt"
"log"
"net"
"net/url"
"sort"
"strconv"
"strings"
"unicode"
"github.com/jackc/pgx/v4"
"github.com/jackc/pgx/v4/stdlib"
"github.com/mikeismert/sqls/dialect"
"golang.org/x/crypto/ssh"
)
func init() {
RegisterOpen("postgresql", postgreSQLOpen)
RegisterFactory("postgresql", NewPostgreSQLDBRepository)
}
func postgreSQLOpen(dbConnCfg *DBConfig) (*DBConnection, error) {
var (
conn *sql.DB
sshConn *ssh.Client
)
dsn, err := genPostgresConfig(dbConnCfg)
if err != nil {
return nil, err
}
if dbConnCfg.SSHCfg != nil {
dbConn, dbSSHConn, err := openPostgreSQLViaSSH(dsn, dbConnCfg.SSHCfg)
if err != nil {
return nil, err
}
conn = dbConn
sshConn = dbSSHConn
} else {
dbConn, err := sql.Open("pgx", dsn)
if err != nil {
return nil, err
}
conn = dbConn
}
if err = conn.Ping(); err != nil {
return nil, err
}
conn.SetMaxIdleConns(DefaultMaxIdleConns)
conn.SetMaxOpenConns(DefaultMaxOpenConns)
return &DBConnection{
Conn: conn,
SSHConn: sshConn,
}, nil
}
func openPostgreSQLViaSSH(dsn string, sshCfg *SSHConfig) (*sql.DB, *ssh.Client, error) {
sshConfig, err := sshCfg.ClientConfig()
if err != nil {
return nil, nil, err
}
sshConn, err := ssh.Dial("tcp", sshCfg.Endpoint(), sshConfig)
if err != nil {
return nil, nil, fmt.Errorf("cannot ssh dial, %w", err)
}
conf, err := pgx.ParseConfig(dsn)
if err != nil {
return nil, nil, err
}
conf.DialFunc = func(ctx context.Context, network, addr string) (net.Conn, error) {
return sshConn.Dial(network, addr)
}
conn := stdlib.OpenDB(*conf)
return conn, sshConn, nil
}
type PostgreSQLDBRepository struct {
Conn *sql.DB
}
func NewPostgreSQLDBRepository(conn *sql.DB) DBRepository {
return &PostgreSQLDBRepository{Conn: conn}
}
func (db *PostgreSQLDBRepository) Driver() dialect.DatabaseDriver {
return dialect.DatabaseDriverPostgreSQL
}
func (db *PostgreSQLDBRepository) CurrentDatabase(ctx context.Context) (string, error) {
row := db.Conn.QueryRowContext(ctx, "SELECT current_database()")
var database string
if err := row.Scan(&database); err != nil {
return "", err
}
return database, nil
}
func (db *PostgreSQLDBRepository) Databases(ctx context.Context) ([]string, error) {
rows, err := db.Conn.QueryContext(
ctx,
`
SELECT datname FROM pg_database
`)
if err != nil {
log.Fatal(err)
}
defer rows.Close()
databases := []string{}
for rows.Next() {
var database string
if err := rows.Scan(&database); err != nil {
return nil, err
}
databases = append(databases, database)
}
return databases, nil
}
func (db *PostgreSQLDBRepository) CurrentSchema(ctx context.Context) (string, error) {
row := db.Conn.QueryRowContext(ctx, "SELECT current_schema()")
var database sql.NullString
if err := row.Scan(&database); err != nil {
return "", err
}
if database.Valid {
return database.String, nil
}
return "", nil
}
func (db *PostgreSQLDBRepository) Schemas(ctx context.Context) ([]string, error) {
rows, err := db.Conn.QueryContext(
ctx,
`
SELECT schema_name FROM information_schema.schemata
`)
if err != nil {
log.Fatal(err)
}
defer rows.Close()
databases := []string{}
for rows.Next() {
var database string
if err := rows.Scan(&database); err != nil {
return nil, err
}
databases = append(databases, database)
}
return databases, nil
}
func (db *PostgreSQLDBRepository) SchemaTables(ctx context.Context) (map[string][]string, error) {
rows, err := db.Conn.QueryContext(
ctx,
`
SELECT
table_schema,
table_name
FROM
information_schema.tables
ORDER BY
table_schema,
table_name
`)
if err != nil {
return nil, err
}
defer rows.Close()
databaseTables := map[string][]string{}
for rows.Next() {
var schema, table string
if err := rows.Scan(&schema, &table); err != nil {
return nil, err
}
if arr, ok := databaseTables[schema]; ok {
databaseTables[schema] = append(arr, table)
} else {
databaseTables[schema] = []string{table}
}
}
return databaseTables, nil
}
func (db *PostgreSQLDBRepository) Tables(ctx context.Context) ([]string, error) {
rows, err := db.Conn.QueryContext(
ctx,
`
SELECT
table_name
FROM
information_schema.tables
WHERE
table_type = 'BASE TABLE'
AND table_schema NOT IN ('pg_catalog', 'information_schema')
ORDER BY
table_name
`)
if err != nil {
log.Fatal(err)
}
defer rows.Close()
tables := []string{}
for rows.Next() {
var table string
if err := rows.Scan(&table); err != nil {
return nil, err
}
tables = append(tables, table)
}
return tables, nil
}
func (db *PostgreSQLDBRepository) DescribeDatabaseTable(ctx context.Context) ([]*ColumnDesc, error) {
rows, err := db.Conn.QueryContext(
ctx,
`
SELECT
c.table_schema,
c.table_name,
c.column_name,
c.data_type,
c.is_nullable,
CASE t.constraint_type
WHEN 'PRIMARY KEY' THEN 'YES'
ELSE 'NO'
END,
c.column_default,
''
FROM
information_schema.columns c
LEFT JOIN (
SELECT
ccu.table_schema as table_schema,
ccu.table_name as table_name,
ccu.column_name as column_name,
tc.constraint_type as constraint_type
FROM information_schema.constraint_column_usage ccu
LEFT JOIN information_schema.table_constraints tc ON
tc.table_schema = ccu.table_schema
AND tc.table_name = ccu.table_name
AND tc.constraint_name = ccu.constraint_name
WHERE
tc.constraint_type = 'PRIMARY KEY'
) as t
ON c.table_schema = t.table_schema
AND c.table_name = t.table_name
AND c.column_name = t.column_name
ORDER BY
c.table_name,
c.ordinal_position
`)
if err != nil {
log.Fatal(err)
}
defer rows.Close()
tableInfos := []*ColumnDesc{}
for rows.Next() {
var tableInfo ColumnDesc
err := rows.Scan(
&tableInfo.Schema,
&tableInfo.Table,
&tableInfo.Name,
&tableInfo.Type,
&tableInfo.Null,
&tableInfo.Key,
&tableInfo.Default,
&tableInfo.Extra,
)
if err != nil {
return nil, err
}
tableInfos = append(tableInfos, &tableInfo)
}
return tableInfos, nil
}
func (db *PostgreSQLDBRepository) DescribeDatabaseTableBySchema(ctx context.Context, schemaName string) ([]*ColumnDesc, error) {
rows, err := db.Conn.QueryContext(
ctx,
`
SELECT
c.table_schema,
c.table_name,
c.column_name,
c.data_type,
c.is_nullable,
CASE t.constraint_type
WHEN 'PRIMARY KEY' THEN 'YES'
ELSE 'NO'
END,
c.column_default,
''
FROM
information_schema.columns c
LEFT JOIN (
SELECT
ccu.table_schema as table_schema,
ccu.table_name as table_name,
ccu.column_name as column_name,
tc.constraint_type as constraint_type
FROM information_schema.constraint_column_usage ccu
LEFT JOIN information_schema.table_constraints tc ON
tc.table_schema = ccu.table_schema
AND tc.table_name = ccu.table_name
AND tc.constraint_name = ccu.constraint_name
WHERE
ccu.table_schema = $1
AND tc.constraint_type = 'PRIMARY KEY'
) as t
ON c.table_schema = t.table_schema
AND c.table_name = t.table_name
AND c.column_name = t.column_name
WHERE
c.table_schema = $2
ORDER BY
c.table_name,
c.ordinal_position
`, schemaName, schemaName)
if err != nil {
log.Fatal(err)
}
defer rows.Close()
tableInfos := []*ColumnDesc{}
for rows.Next() {
var tableInfo ColumnDesc
err := rows.Scan(
&tableInfo.Schema,
&tableInfo.Table,
&tableInfo.Name,
&tableInfo.Type,
&tableInfo.Null,
&tableInfo.Key,
&tableInfo.Default,
&tableInfo.Extra,
)
if err != nil {
return nil, err
}
tableInfos = append(tableInfos, &tableInfo)
}
return tableInfos, nil
}
func (db *PostgreSQLDBRepository) DescribeForeignKeysBySchema(ctx context.Context, schemaName string) ([]*ForeignKey, error) {
rows, err := db.Conn.QueryContext(
ctx,
`
select kcu.CONSTRAINT_NAME,
kcu.TABLE_NAME,
kcu.COLUMN_NAME,
rel_kcu.TABLE_NAME,
rel_kcu.COLUMN_NAME
from INFORMATION_SCHEMA.TABLE_CONSTRAINTS tco
join INFORMATION_SCHEMA.KEY_COLUMN_USAGE kcu
on tco.CONSTRAINT_SCHEMA = kcu.CONSTRAINT_SCHEMA
and tco.CONSTRAINT_NAME = kcu.CONSTRAINT_NAME
join INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS rco
on tco.CONSTRAINT_SCHEMA = rco.CONSTRAINT_SCHEMA
and tco.CONSTRAINT_NAME = rco.CONSTRAINT_NAME
join INFORMATION_SCHEMA.KEY_COLUMN_USAGE rel_kcu
on rco.UNIQUE_CONSTRAINT_SCHEMA = rel_kcu.CONSTRAINT_SCHEMA
and rco.UNIQUE_CONSTRAINT_NAME = rel_kcu.CONSTRAINT_NAME
and kcu.ORDINAL_POSITION = rel_kcu.ORDINAL_POSITION
where tco.CONSTRAINT_TYPE = 'FOREIGN KEY'
and tco.CONSTRAINT_SCHEMA = $1
order by kcu.CONSTRAINT_NAME,
kcu.ORDINAL_POSITION
`, schemaName)
if err != nil {
log.Fatal(err)
}
defer func() { _ = rows.Close() }()
return parseForeignKeys(rows, schemaName)
}
func (db *PostgreSQLDBRepository) Exec(ctx context.Context, query string) (sql.Result, error) {
return db.Conn.ExecContext(ctx, query)
}
func (db *PostgreSQLDBRepository) Query(ctx context.Context, query string) (*sql.Rows, error) {
return db.Conn.QueryContext(ctx, query)
}
func genPostgresConfig(connCfg *DBConfig) (string, error) {
if connCfg.DataSourceName != "" {
return connCfg.DataSourceName, nil
}
q := url.Values{}
q.Set("user", connCfg.User)
q.Set("password", connCfg.Passwd)
q.Set("dbname", connCfg.DBName)
switch connCfg.Proto {
case ProtoTCP, ProtoUDP:
host, port := connCfg.Host, connCfg.Port
if host == "" {
host = "127.0.0.1"
}
if port == 0 {
port = 5432
}
q.Set("host", host)
q.Set("port", strconv.Itoa(port))
case ProtoUnix:
q.Set("host", connCfg.Path)
default:
return "", fmt.Errorf("default addr for network %s unknown", connCfg.Proto)
}
for k, v := range connCfg.Params {
q.Set(k, v)
}
return genOptions(q, "", "=", " ", ",", true), nil
}
// genOptions takes URL values and generates options, joining together with
// joiner, and separated by sep, with any multi URL values joined by valSep,
// ignoring any values with keys in ignore.
//
// For example, to build a "ODBC" style connection string, use like the following:
// genOptions(u.Query(), "", "=", ";", ",")
func genOptions(q url.Values, joiner, assign, sep, valSep string, skipWhenEmpty bool, ignore ...string) string {
qlen := len(q)
if qlen == 0 {
return ""
}
// make ignore map
ig := make(map[string]bool, len(ignore))
for _, v := range ignore {
ig[strings.ToLower(v)] = true
}
// sort keys
s := make([]string, len(q))
var i int
for k := range q {
s[i] = k
i++
}
sort.Strings(s)
var opts []string
for _, k := range s {
if !ig[strings.ToLower(k)] {
val := strings.Join(q[k], valSep)
if !skipWhenEmpty || val != "" {
if val != "" {
val = assign + val
}
opts = append(opts, k+val)
}
}
}
if len(opts) != 0 {
return joiner + strings.Join(opts, sep)
}
return ""
}
type values map[string]string
// scanner implements a tokenizer for libpq-style option strings.
type scanner struct {
s []rune
i int
}
// Next returns the next rune.
// It returns 0, false if the end of the text has been reached.
func (s *scanner) Next() (rune, bool) {
if s.i >= len(s.s) {
return 0, false
}
r := s.s[s.i]
s.i++
return r, true
}
// newScanner returns a new scanner initialized with the option string s.
func newScanner(s string) *scanner {
return &scanner{[]rune(s), 0}
}
// SkipSpaces returns the next non-whitespace rune.
// It returns 0, false if the end of the text has been reached.
func (s *scanner) SkipSpaces() (rune, bool) {
r, ok := s.Next()
for unicode.IsSpace(r) && ok {
r, ok = s.Next()
}
return r, ok
}