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minio/pkg/ioutil/delimited-reader_test.go

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/*
* Minio Cloud Storage, (C) 2016, 2017, 2018 Minio, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package ioutil
import (
"bytes"
"io"
"strings"
"testing"
)
// Test for DelimitedCSVReader.
func TestDelimitedReader(t *testing.T) {
expected := "username,age\nbanana,12\ncarrot,23\napple,34\nbrinjal,90\nraddish,45"
inputs := []struct {
inputcsv string
delimiter string
chunkSize int
}{
// case 1 - with default `\n` delimiter.
{"username,age\nbanana,12\ncarrot,23\napple,34\nbrinjal,90\nraddish,45", "\n", 10},
// case 2 - with carriage return `\r` which should be replaced with `\n` by default.
{"username,age\rbanana,12\rcarrot,23\rapple,34\rbrinjal,90\rraddish,45", "\n", 10},
// case 3 - with a double character delimiter (octals).
{"username,age\r\nbanana,12\r\ncarrot,23\r\napple,34\r\nbrinjal,90\r\nraddish,45", "\r\n", 10},
// case 4 - with a double character delimiter.
{"username,agexvbanana,12xvcarrot,23xvapple,34xvbrinjal,90xvraddish,45", "xv", 10},
// case 5 - with a double character delimiter `\t `
{"username,age\t banana,12\t carrot,23\t apple,34\t brinjal,90\t raddish,45", "\t ", 10},
// case 6 - This is a special case where the first delimiter match falls in the 13'th byte space
// ie, the last byte space of the read chunk, In this case the reader should peek in the next byte
// and replace with `\n`.
{"username,agexxbanana,12xxcarrot,23xxapple,34xxbrinjal,90xxraddish,45", "xx", 13},
}
for c, input := range inputs {
var readcsv []byte
var err error
delimitedReader := NewDelimitedReader(strings.NewReader(input.inputcsv), []rune(input.delimiter))
for err == nil {
chunk := make([]byte, input.chunkSize)
_, err = delimitedReader.Read(chunk)
readcsv = append(readcsv, chunk...)
}
if err != io.EOF {
t.Fatalf("Case %d: Error in delimited read", c+1)
}
expected := []byte(expected)
cleanCsv := removeNulls(readcsv)
if !bytes.Equal(cleanCsv, expected) {
t.Fatalf("Case %d: Expected the delimited csv to be `%s`, but instead found `%s`", c+1, string(expected), string(cleanCsv))
}
}
}
// Removes all the tailing nulls in chunks.
// Null chunks will be assigned if there is a reduction
// Eg, When `xv` is reduced to `\n`, the last byte is nullified.
func removeNulls(csv []byte) []byte {
cleanCsv := []byte{}
for _, p := range csv {
if p != 0 {
cleanCsv = append(cleanCsv, p)
}
}
return cleanCsv
}