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export.go
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export.go
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package handler
import (
"database/sql"
"encoding/csv"
"encoding/json"
"net/http"
"strconv"
"github.com/go-sql-driver/mysql"
"github.com/src-d/gitbase-web/server/serializer"
"github.com/src-d/gitbase-web/server/service"
)
// Export returns a function that forwards an SQL query to gitbase and returns
// the rows as CSV file
func Export(db service.SQLDB) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
err := func(w http.ResponseWriter, r *http.Request) error {
query := r.URL.Query().Get("query")
if query == "" {
return serializer.NewHTTPError(http.StatusBadRequest,
`Bad Request. Query can't be empty.`)
}
rows, err := db.Query(query)
if err != nil {
return dbError(err)
}
defer rows.Close()
columnNames, columnTypes, err := columnsInfo(rows)
if err != nil {
return err
}
columnValsPtr := genericVals(columnTypes)
w.Header().Set("Content-Disposition", "attachment; filename=export.csv")
w.Header().Set("Content-Type", "text/csv")
csvWriter := csv.NewWriter(w)
csvWriter.Write(columnNames)
for rows.Next() {
if err := rows.Scan(columnValsPtr...); err != nil {
return err
}
record := make([]string, len(columnTypes))
for i, val := range columnValsPtr {
switch v := val.(type) {
case *sql.NullBool:
sqlVal, _ := val.(*sql.NullBool)
if sqlVal.Valid {
record[i] = strconv.FormatBool(sqlVal.Bool)
}
case *mysql.NullTime:
sqlVal, _ := val.(*mysql.NullTime)
if sqlVal.Valid {
b, err := sqlVal.Time.MarshalText()
if err != nil {
return err
}
record[i] = string(b)
}
case *sql.NullInt64:
sqlVal, _ := val.(*sql.NullInt64)
if sqlVal.Valid {
record[i] = strconv.FormatInt(sqlVal.Int64, 10)
}
case *sql.NullString:
// DatabaseTypeName TEXT is used for text or blobs. We try
// to parse as UAST first
sqlVal, _ := val.(*sql.NullString)
if sqlVal.Valid {
nodes, err := service.UnmarshalNodes([]byte(sqlVal.String))
if err == nil && nodes != nil {
b, err := json.MarshalIndent(nodes, "", " ")
if err != nil {
return err
}
record[i] = string(b)
} else {
record[i] = sqlVal.String
}
}
case *[]byte:
record[i] = string(*v)
}
}
if err := csvWriter.Write(record); err != nil {
return err
}
}
if err := rows.Err(); err != nil {
return err
}
if err := csvWriter.Error(); err != nil {
return err
}
csvWriter.Flush()
return nil
}(w, r)
if err != nil {
if httpError, ok := err.(serializer.HTTPError); ok {
http.Error(w, httpError.Error(), httpError.StatusCode())
} else {
http.Error(w, err.Error(), http.StatusInternalServerError)
}
}
}
}