/
reader.go
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/
reader.go
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package gdrive_utils
import (
"fmt"
"io"
"net/http"
"strings"
"github.com/gocarina/gocsv"
"google.golang.org/api/googleapi"
"google.golang.org/api/sheets/v4"
)
type Predicate struct {
Header string
By func(v []interface{}) (int, error)
}
type SheetReader struct {
srv *sheets.Service
spreadsheetId string
sheetName string
columnStart string
columnEnd string
rowStart int
idx int
header bool
ValueRenderOption string
DateTimeRenderOption string
}
var _ gocsv.CSVReader = &SheetReader{}
func NewReader(srv *sheets.Service, spreadsheetId, sheetName string, rowStart int) (*SheetReader, error) {
r := &SheetReader{
srv: srv,
spreadsheetId: spreadsheetId,
sheetName: sheetName,
columnStart: "A",
rowStart: rowStart,
idx: rowStart,
ValueRenderOption: "FORMATTED_VALUE",
DateTimeRenderOption: "SERIAL_NUMBER",
}
values, err := r.readHeader()
if err != nil {
return nil, err
}
var sb strings.Builder
sb.WriteRune(rune('A'+len(values[0])) - 1)
r.columnEnd = sb.String()
return r, nil
}
func NewLastRowReader(srv *sheets.Service, spreadsheetId, sheetName string) (*SheetReader, error) {
readRange := fmt.Sprintf("%s!A:A", sheetName)
resp, err := srv.Spreadsheets.Values.Get(spreadsheetId, readRange).
ValueRenderOption("FORMATTED_VALUE").
DateTimeRenderOption("SERIAL_NUMBER").
Do()
if err != nil {
return nil, fmt.Errorf("unable to retrieve data from sheet: %v", err)
}
if len(resp.Values) == 0 {
return nil, io.EOF
}
return NewReader(srv, spreadsheetId, sheetName, len(resp.Values))
}
func NewColumnReader(srv *sheets.Service, spreadsheetId, sheetName, header string) (*SheetReader, error) {
r := &SheetReader{
srv: srv,
spreadsheetId: spreadsheetId,
sheetName: sheetName,
columnStart: "A",
rowStart: -1,
idx: -1,
ValueRenderOption: "FORMATTED_VALUE",
DateTimeRenderOption: "SERIAL_NUMBER",
}
values, err := r.readHeader()
if err != nil {
return nil, err
}
var sb strings.Builder
sb.WriteRune(rune('A' + len(values[0]) - 1))
r.columnEnd = sb.String()
sb.Reset()
for i, v := range values[0] {
if v.(string) == header {
sb.WriteRune(rune('A' + i))
break
}
}
if sb.Len() == 0 {
return nil, fmt.Errorf("missing header %s", header)
}
r.columnStart = sb.String()
r.columnEnd = sb.String()
r.rowStart = 1
r.idx = 1
return r, nil
}
func NewRowReader(srv *sheets.Service, spreadsheetId, sheetName string, predicate *Predicate) (*SheetReader, error) {
if predicate == nil {
return NewReader(srv, spreadsheetId, sheetName, 1)
}
r := &SheetReader{
srv: srv,
spreadsheetId: spreadsheetId,
sheetName: sheetName,
columnStart: "A",
rowStart: -1,
idx: -1,
ValueRenderOption: "FORMATTED_VALUE",
DateTimeRenderOption: "SERIAL_NUMBER",
}
values, err := r.readHeader()
if err != nil {
return nil, err
}
var sb strings.Builder
sb.WriteRune(rune('A' + len(values[0]) - 1))
r.columnEnd = sb.String()
sb.Reset()
for i, v := range values[0] {
if v.(string) == predicate.Header {
sb.WriteRune(rune('A' + i))
break
}
}
if sb.Len() == 0 {
return nil, fmt.Errorf("missing header %s", predicate.Header)
}
// read column
readRange := fmt.Sprintf("%s!%s2:%s", sheetName, sb.String(), sb.String())
resp, err := srv.Spreadsheets.Values.Get(spreadsheetId, readRange).
MajorDimension("COLUMNS").
ValueRenderOption("FORMATTED_VALUE").
DateTimeRenderOption("SERIAL_NUMBER").
Do()
if err != nil {
return nil, fmt.Errorf("unable to retrieve data from sheet: %v", err)
}
if len(resp.Values) == 0 {
// column only has header row
return nil, io.EOF
}
idx, err := predicate.By(resp.Values[0])
if err != nil {
return nil, err
}
if idx == -1 {
return nil, io.EOF
}
r.rowStart = idx + 2 // starts from 1, also includes header row
r.idx = idx + 2
return r, nil
}
// Read reads one record (a slice of fields) from r.
// If the record has an unexpected number of fields,
// Read returns the record along with the error ErrFieldCount.
// Except for that case, Read always returns either a non-nil
// record or a non-nil error, but not both.
// If there is no data left to be read, Read returns nil, io.EOF.
// If ReuseRecord is true, the returned slice may be shared
// between multiple calls to Read.
func (r *SheetReader) Read() (record []string, err error) {
if !r.header && r.idx > 1 {
record, err = r.read(1)
if err != nil {
return nil, err
}
r.header = true
return record, err
}
record, err = r.read(r.idx)
if err != nil {
return nil, err
}
r.idx++
return record, nil
}
func (r *SheetReader) read(idx int) (record []string, err error) {
readRange := fmt.Sprintf("%s!%s%d:%s%d", r.sheetName, r.columnStart, idx, r.columnEnd, idx)
resp, err := r.srv.Spreadsheets.Values.Get(r.spreadsheetId, readRange).
ValueRenderOption(r.ValueRenderOption).
DateTimeRenderOption(r.DateTimeRenderOption).
Do()
if err != nil {
return nil, fmt.Errorf("unable to retrieve data from sheet: %v", err)
}
if resp.Values == nil {
return nil, io.EOF
}
if len(resp.Values) > 1 {
return nil, fmt.Errorf("multiple rows returned")
}
record = make([]string, len(resp.Values[0]))
for i := range resp.Values[0] {
record[i] = fmt.Sprintf("%v", resp.Values[0][i])
}
return record, nil
}
func (r *SheetReader) readHeader() ([][]interface{}, error) {
// read first row
readRange := fmt.Sprintf("%s!1:1", r.sheetName)
resp, err := r.srv.Spreadsheets.Values.Get(r.spreadsheetId, readRange).
ValueRenderOption(r.ValueRenderOption).
DateTimeRenderOption(r.DateTimeRenderOption).
Do()
if e, ok := err.(*googleapi.Error); ok && e.Code == http.StatusBadRequest {
return nil, io.EOF
} else if err != nil {
return nil, fmt.Errorf("unable to retrieve data from sheet: %v", err)
}
if len(resp.Values) == 0 {
return nil, io.EOF
}
return resp.Values, nil
}
// ReadAll reads all the remaining records from r.
// Each record is a slice of fields.
// A successful call returns err == nil, not err == io.EOF. Because ReadAll is
// defined to read until EOF, it does not treat end of file as an error to be
// reported.
func (r *SheetReader) ReadAll() (records [][]string, err error) {
readRange := fmt.Sprintf("%s!%s%d:%s", r.sheetName, r.columnStart, r.idx, r.columnEnd)
resp, err := r.srv.Spreadsheets.Values.Get(r.spreadsheetId, readRange).
ValueRenderOption(r.ValueRenderOption).
DateTimeRenderOption(r.DateTimeRenderOption).
Do()
if err != nil {
return nil, fmt.Errorf("unable to retrieve data from sheet: %v", err)
}
if resp.Values == nil {
return nil, io.EOF
}
offset := 0
if !r.header && r.idx > 1 {
records = make([][]string, len(resp.Values)+1)
records[0], err = r.read(1)
if err != nil {
return nil, err
}
r.header = true
offset = 1
} else {
records = make([][]string, len(resp.Values))
if r.idx == 1 {
r.header = true
}
}
for i, row := range resp.Values {
records[i+offset] = make([]string, len(row))
for j := range row {
records[i+offset][j] = fmt.Sprintf("%v", row[j])
}
}
r.idx += len(resp.Values)
return records, nil
}