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// SPDX-FileCopyrightText: 2018 Stefan Majewsky <majewsky@gmx.net>
// SPDX-License-Identifier: Apache-2.0
package schwift
import (
"context"
"encoding/json"
"net/http"
"strconv"
"strings"
)
// iteratorInterface allows iteratorBase to access public attributes of
// ContainerIterator/ObjectIterator.
type iteratorInterface interface {
getAccount() *Account
getContainerName() string
getDelimiter() string
getPrefix() string
getOptions() *RequestOptions
// putHeader initializes the AccountHeaders/ContainerHeaders field of the
// Account/Container using the response headers from the GET request.
putHeader(http.Header) error
}
func (i ContainerIterator) getAccount() *Account { return i.Account }
func (i ContainerIterator) getContainerName() string { return "" }
func (i ContainerIterator) getDelimiter() string { return "" }
func (i ContainerIterator) getPrefix() string { return i.Prefix }
func (i ContainerIterator) getOptions() *RequestOptions { return i.Options }
func (i ContainerIterator) putHeader(hdr http.Header) error {
headers := AccountHeaders{headersFromHTTP(hdr)}
if err := headers.Validate(); err != nil {
return err
}
i.Account.headers = &headers
return nil
}
func (i ObjectIterator) getAccount() *Account { return i.Container.Account() }
func (i ObjectIterator) getContainerName() string { return i.Container.Name() }
func (i ObjectIterator) getDelimiter() string { return i.Delimiter }
func (i ObjectIterator) getPrefix() string { return i.Prefix }
func (i ObjectIterator) getOptions() *RequestOptions { return i.Options }
func (i ObjectIterator) putHeader(hdr http.Header) error {
headers := ContainerHeaders{headersFromHTTP(hdr)}
if err := headers.Validate(); err != nil {
return err
}
i.Container.headers = &headers
return nil
}
// iteratorBase provides shared behavior for ContainerIterator and ObjectIterator.
type iteratorBase struct {
i iteratorInterface
marker string
eof bool
}
func (b *iteratorBase) request(limit int, detailed bool) Request {
r := Request{
Method: http.MethodGet,
ContainerName: b.i.getContainerName(),
Options: cloneRequestOptions(b.i.getOptions(), nil),
}
if delimiter := b.i.getDelimiter(); delimiter != "" {
r.Options.Values.Set("delimiter", delimiter)
}
if prefix := b.i.getPrefix(); prefix != "" {
r.Options.Values.Set("prefix", prefix)
}
if b.marker == "" {
r.Options.Values.Del("marker")
} else {
r.Options.Values.Set("marker", b.marker)
}
if limit < 0 {
r.Options.Values.Del("limit")
} else {
r.Options.Values.Set("limit", strconv.FormatUint(uint64(limit), 10))
}
if detailed {
r.Options.Headers.Set("Accept", "application/json")
r.Options.Values.Set("format", "json")
r.ExpectStatusCodes = []int{200}
} else {
r.Options.Headers.Set("Accept", "text/plain")
r.Options.Values.Set("format", "plain")
r.ExpectStatusCodes = []int{200, 204}
}
return r
}
func (b *iteratorBase) nextPage(ctx context.Context, limit int) ([]string, error) {
if b.eof {
return nil, nil
}
resp, err := b.request(limit, false).Do(ctx, b.i.getAccount().backend)
if err != nil {
return nil, err
}
buf, err := collectResponseBody(resp)
if err != nil {
return nil, err
}
bufStr := strings.TrimSuffix(string(buf), "\n")
var result []string
if bufStr != "" {
result = strings.Split(bufStr, "\n")
}
if len(result) == 0 {
b.eof = true
b.marker = ""
} else {
b.eof = false
b.marker = result[len(result)-1]
}
return result, b.i.putHeader(resp.Header)
}
func (b *iteratorBase) nextPageDetailed(ctx context.Context, limit int, data any) error {
if b.eof {
return nil
}
resp, err := b.request(limit, true).Do(ctx, b.i.getAccount().backend)
if err != nil {
return err
}
err = json.NewDecoder(resp.Body).Decode(&data)
closeErr := resp.Body.Close()
if err == nil {
err = closeErr
}
if err == nil {
err = b.i.putHeader(resp.Header)
}
return err
}
func (b *iteratorBase) setMarker(marker string) {
b.marker = marker
b.eof = marker == ""
}
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