mirror of https://github.com/perkeep/perkeep.git
133 lines
3.8 KiB
Go
133 lines
3.8 KiB
Go
/*
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Copyright 2011 Google Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/*
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Package remote registers the "remote" blobserver storage type, storing
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and fetching blobs from a remote Camlistore server, speaking the HTTP
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protocol.
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Example low-level config:
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"/peer/": {
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"handler": "storage-remote",
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"handlerArgs": {
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"url": "http://10.0.0.17/base",
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"auth": "userpass:user:pass",
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"skipStartupCheck": false
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}
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},
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*/
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package remote
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import (
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"io"
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"log"
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"os"
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"camlistore.org/pkg/blob"
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"camlistore.org/pkg/blobserver"
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"camlistore.org/pkg/client"
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"camlistore.org/pkg/context"
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"camlistore.org/pkg/jsonconfig"
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)
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// remoteStorage is a blobserver.Storage proxy for a remote camlistore
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// blobserver.
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type remoteStorage struct {
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client *client.Client
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}
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var _ = blobserver.Storage((*remoteStorage)(nil))
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// NewFromClient returns a new Storage implementation using the
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// provided Camlistore client.
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func NewFromClient(c *client.Client) blobserver.Storage {
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return &remoteStorage{client: c}
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}
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func newFromConfig(_ blobserver.Loader, config jsonconfig.Obj) (storage blobserver.Storage, err error) {
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url := config.RequiredString("url")
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auth := config.RequiredString("auth")
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skipStartupCheck := config.OptionalBool("skipStartupCheck", false)
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if err := config.Validate(); err != nil {
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return nil, err
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}
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client := client.New(url)
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if err = client.SetupAuthFromString(auth); err != nil {
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return nil, err
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}
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client.SetLogger(log.New(os.Stderr, "remote", log.LstdFlags))
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sto := &remoteStorage{
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client: client,
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}
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if !skipStartupCheck {
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// Do a quick dummy operation to check that our credentials are
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// correct.
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// TODO(bradfitz,mpl): skip this operation smartly if it turns out this is annoying/slow for whatever reason.
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c := make(chan blob.SizedRef, 1)
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err = sto.EnumerateBlobs(context.TODO(), c, "", 1)
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if err != nil {
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return nil, err
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}
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}
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return sto, nil
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}
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func (sto *remoteStorage) RemoveBlobs(blobs []blob.Ref) error {
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return sto.client.RemoveBlobs(blobs)
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}
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func (sto *remoteStorage) StatBlobs(dest chan<- blob.SizedRef, blobs []blob.Ref) error {
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// TODO: cache the stat response's uploadUrl to save a future
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// stat later? otherwise clients will just Stat + Upload, but
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// Upload will also Stat. should be smart and make sure we
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// avoid ReceiveBlob's Stat whenever it would be redundant.
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return sto.client.StatBlobs(dest, blobs)
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}
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func (sto *remoteStorage) ReceiveBlob(blob blob.Ref, source io.Reader) (outsb blob.SizedRef, outerr error) {
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h := &client.UploadHandle{
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BlobRef: blob,
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Size: 0, // size isn't known; 0 is fine, but TODO: ask source if it knows its size
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Contents: source,
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}
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pr, err := sto.client.Upload(h)
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if err != nil {
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outerr = err
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return
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}
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return pr.SizedBlobRef(), nil
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}
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func (sto *remoteStorage) Fetch(b blob.Ref) (file io.ReadCloser, size uint32, err error) {
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return sto.client.Fetch(b)
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}
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func (sto *remoteStorage) MaxEnumerate() int { return 1000 }
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func (sto *remoteStorage) EnumerateBlobs(ctx *context.Context, dest chan<- blob.SizedRef, after string, limit int) error {
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return sto.client.EnumerateBlobsOpts(ctx, dest, client.EnumerateOpts{
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After: after,
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Limit: limit,
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})
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}
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func init() {
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blobserver.RegisterStorageConstructor("remote", blobserver.StorageConstructor(newFromConfig))
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}
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