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main.go
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main.go
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package main
import (
"database/sql"
"fmt"
_ "github.com/ClickHouse/clickhouse-go"
"github.com/jawher/mow.cli"
_ "github.com/prestodb/presto-go-client/presto"
"gopkg.in/Knetic/govaluate.v2"
"os"
"strings"
"time"
)
type Result struct {
output string
retCode int
}
var stopwords = []string{
"ALTER",
"CREATE",
"DELETE",
"DROP",
"EXEC",
"TRUNCATE",
"UPDATE",
"INSERT",
}
func main() {
app := cli.App("go-sql-check", "")
app.Spec = "[--driver] [--connection-url] --query --expression"
var (
driver = app.StringOpt("d driver", "clickhouse", "One of clickhouse, presto")
connectionUrl = app.StringOpt("c connection-url", "tcp://127.0.0.1:9000", "DSN for connection")
query = app.StringOpt("q query", "", "")
expr = app.StringOpt("e expression", "", "")
)
app.Action = func() {
for _, w := range stopwords {
if strings.Contains(strings.ToLower(*query), strings.ToLower(w)) {
fatalOnError(fmt.Errorf("Only select allowed"))
}
}
connect, err := sql.Open(*driver, *connectionUrl)
fatalOnError(err)
fatalOnError(connect.Ping())
rows, err := connect.Query(*query)
fatalOnError(err)
defer rows.Close()
f, err := getFirst(rows)
fatalOnError(err)
functions := map[string]govaluate.ExpressionFunction{
"info": func(arguments ...interface{}) (i interface{}, err error) {
return Result{
output: fmt.Sprint(arguments...),
retCode: 0,
}, nil
},
"warn": func(arguments ...interface{}) (i interface{}, err error) {
return Result{
output: fmt.Sprint(arguments...),
retCode: 1,
}, nil
},
"error": func(arguments ...interface{}) (i interface{}, err error) {
return Result{
output: fmt.Sprint(arguments...),
retCode: 2,
}, nil
},
"timestamp": func(arguments ...interface{}) (interface{}, error) {
return time.Now().Unix(), nil
},
}
expression, err := govaluate.NewEvaluableExpressionWithFunctions(*expr, functions)
fatalOnError(err)
result, err := expression.Evaluate(f)
fatalOnError(err)
switch result.(type) {
case Result:
r := result.(Result)
fmt.Println(r.output)
cli.Exit(r.retCode)
default:
cli.Exit(0)
}
}
app.Run(os.Args)
}
func fatalOnError(err error) {
if err != nil {
fmt.Println(err)
cli.Exit(2)
}
}
func getFirst(rows *sql.Rows) (map[string]interface{}, error) {
for rows.Next() {
cols, err := rows.Columns()
if err != nil {
return nil, err
}
columns := make([]interface{}, len(cols))
columnPointers := make([]interface{}, len(cols))
for i, _ := range columns {
columnPointers[i] = &columns[i]
}
if err := rows.Scan(columnPointers...); err != nil {
return nil, err
}
types, _ := rows.ColumnTypes()
m := make(map[string]interface{})
for i, colName := range cols {
t := types[i].ScanType()
switch t.String() {
default:
m[colName] = *columnPointers[i].(*interface{})
}
}
return m, nil
}
return nil, nil
}