opendal/services/gcs/
backend.rs

1// Licensed to the Apache Software Foundation (ASF) under one
2// or more contributor license agreements.  See the NOTICE file
3// distributed with this work for additional information
4// regarding copyright ownership.  The ASF licenses this file
5// to you under the Apache License, Version 2.0 (the
6// "License"); you may not use this file except in compliance
7// with the License.  You may obtain a copy of the License at
8//
9//   http://www.apache.org/licenses/LICENSE-2.0
10//
11// Unless required by applicable law or agreed to in writing,
12// software distributed under the License is distributed on an
13// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
14// KIND, either express or implied.  See the License for the
15// specific language governing permissions and limitations
16// under the License.
17
18use std::fmt::Debug;
19use std::fmt::Formatter;
20use std::sync::Arc;
21
22use http::Response;
23use http::StatusCode;
24use log::debug;
25use reqsign::GoogleCredentialLoader;
26use reqsign::GoogleSigner;
27use reqsign::GoogleTokenLoad;
28use reqsign::GoogleTokenLoader;
29
30use super::core::*;
31use super::delete::GcsDeleter;
32use super::error::parse_error;
33use super::lister::GcsLister;
34use super::writer::GcsWriter;
35use super::writer::GcsWriters;
36use crate::raw::oio::BatchDeleter;
37use crate::raw::*;
38use crate::services::GcsConfig;
39use crate::*;
40
41const DEFAULT_GCS_ENDPOINT: &str = "https://storage.googleapis.com";
42const DEFAULT_GCS_SCOPE: &str = "https://www.googleapis.com/auth/devstorage.read_write";
43
44impl Configurator for GcsConfig {
45    type Builder = GcsBuilder;
46
47    #[allow(deprecated)]
48    fn into_builder(self) -> Self::Builder {
49        GcsBuilder {
50            config: self,
51            http_client: None,
52            customized_token_loader: None,
53        }
54    }
55}
56
57/// [Google Cloud Storage](https://cloud.google.com/storage) services support.
58#[doc = include_str!("docs.md")]
59#[derive(Default)]
60pub struct GcsBuilder {
61    config: GcsConfig,
62
63    #[deprecated(since = "0.53.0", note = "Use `Operator::update_http_client` instead")]
64    http_client: Option<HttpClient>,
65    customized_token_loader: Option<Box<dyn GoogleTokenLoad>>,
66}
67
68impl Debug for GcsBuilder {
69    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
70        let mut ds = f.debug_struct("GcsBuilder");
71
72        ds.field("config", &self.config);
73        ds.finish_non_exhaustive()
74    }
75}
76
77impl GcsBuilder {
78    /// set the working directory root of backend
79    pub fn root(mut self, root: &str) -> Self {
80        self.config.root = if root.is_empty() {
81            None
82        } else {
83            Some(root.to_string())
84        };
85
86        self
87    }
88
89    /// set the container's name
90    pub fn bucket(mut self, bucket: &str) -> Self {
91        self.config.bucket = bucket.to_string();
92        self
93    }
94
95    /// set the GCS service scope
96    ///
97    /// If not set, we will use `https://www.googleapis.com/auth/devstorage.read_write`.
98    ///
99    /// # Valid scope examples
100    ///
101    /// - read-only: `https://www.googleapis.com/auth/devstorage.read_only`
102    /// - read-write: `https://www.googleapis.com/auth/devstorage.read_write`
103    /// - full-control: `https://www.googleapis.com/auth/devstorage.full_control`
104    ///
105    /// Reference: [Cloud Storage authentication](https://cloud.google.com/storage/docs/authentication)
106    pub fn scope(mut self, scope: &str) -> Self {
107        if !scope.is_empty() {
108            self.config.scope = Some(scope.to_string())
109        };
110        self
111    }
112
113    /// Set the GCS service account.
114    ///
115    /// service account will be used for fetch token from vm metadata.
116    /// If not set, we will try to fetch with `default` service account.
117    pub fn service_account(mut self, service_account: &str) -> Self {
118        if !service_account.is_empty() {
119            self.config.service_account = Some(service_account.to_string())
120        };
121        self
122    }
123
124    /// set the endpoint GCS service uses
125    pub fn endpoint(mut self, endpoint: &str) -> Self {
126        if !endpoint.is_empty() {
127            self.config.endpoint = Some(endpoint.to_string())
128        };
129        self
130    }
131
132    /// set the base64 hashed credentials string used for OAuth2 authentication.
133    ///
134    /// this method allows to specify the credentials directly as a base64 hashed string.
135    /// alternatively, you can use `credential_path()` to provide the local path to a credentials file.
136    /// we will use one of `credential` and `credential_path` to complete the OAuth2 authentication.
137    ///
138    /// Reference: [Google Cloud Storage Authentication](https://cloud.google.com/docs/authentication).
139    pub fn credential(mut self, credential: &str) -> Self {
140        if !credential.is_empty() {
141            self.config.credential = Some(credential.to_string())
142        };
143        self
144    }
145
146    /// set the local path to credentials file which is used for OAuth2 authentication.
147    ///
148    /// credentials file contains the original credentials that have not been base64 hashed.
149    /// we will use one of `credential` and `credential_path` to complete the OAuth2 authentication.
150    ///
151    /// Reference: [Google Cloud Storage Authentication](https://cloud.google.com/docs/authentication).
152    pub fn credential_path(mut self, path: &str) -> Self {
153        if !path.is_empty() {
154            self.config.credential_path = Some(path.to_string())
155        };
156        self
157    }
158
159    /// Specify the http client that used by this service.
160    ///
161    /// # Notes
162    ///
163    /// This API is part of OpenDAL's Raw API. `HttpClient` could be changed
164    /// during minor updates.
165    #[deprecated(since = "0.53.0", note = "Use `Operator::update_http_client` instead")]
166    #[allow(deprecated)]
167    pub fn http_client(mut self, client: HttpClient) -> Self {
168        self.http_client = Some(client);
169        self
170    }
171
172    /// Specify the customized token loader used by this service.
173    pub fn customized_token_loader(mut self, token_load: Box<dyn GoogleTokenLoad>) -> Self {
174        self.customized_token_loader = Some(token_load);
175        self
176    }
177
178    /// Provide the OAuth2 token to use.
179    pub fn token(mut self, token: String) -> Self {
180        self.config.token = Some(token);
181        self
182    }
183
184    /// Disable attempting to load credentials from the GCE metadata server.
185    pub fn disable_vm_metadata(mut self) -> Self {
186        self.config.disable_vm_metadata = true;
187        self
188    }
189
190    /// Disable loading configuration from the environment.
191    pub fn disable_config_load(mut self) -> Self {
192        self.config.disable_config_load = true;
193        self
194    }
195
196    /// Set the predefined acl for GCS.
197    ///
198    /// Available values are:
199    /// - `authenticatedRead`
200    /// - `bucketOwnerFullControl`
201    /// - `bucketOwnerRead`
202    /// - `private`
203    /// - `projectPrivate`
204    /// - `publicRead`
205    pub fn predefined_acl(mut self, acl: &str) -> Self {
206        if !acl.is_empty() {
207            self.config.predefined_acl = Some(acl.to_string())
208        };
209        self
210    }
211
212    /// Set the default storage class for GCS.
213    ///
214    /// Available values are:
215    /// - `STANDARD`
216    /// - `NEARLINE`
217    /// - `COLDLINE`
218    /// - `ARCHIVE`
219    pub fn default_storage_class(mut self, class: &str) -> Self {
220        if !class.is_empty() {
221            self.config.default_storage_class = Some(class.to_string())
222        };
223        self
224    }
225
226    /// Allow anonymous requests.
227    ///
228    /// This is typically used for buckets which are open to the public or GCS
229    /// storage emulators.
230    pub fn allow_anonymous(mut self) -> Self {
231        self.config.allow_anonymous = true;
232        self
233    }
234}
235
236impl Builder for GcsBuilder {
237    const SCHEME: Scheme = Scheme::Gcs;
238    type Config = GcsConfig;
239
240    fn build(self) -> Result<impl Access> {
241        debug!("backend build started: {self:?}");
242
243        let root = normalize_root(&self.config.root.unwrap_or_default());
244        debug!("backend use root {root}");
245
246        // Handle endpoint and bucket name
247        let bucket = match self.config.bucket.is_empty() {
248            false => Ok(&self.config.bucket),
249            true => Err(
250                Error::new(ErrorKind::ConfigInvalid, "The bucket is misconfigured")
251                    .with_operation("Builder::build")
252                    .with_context("service", Scheme::Gcs),
253            ),
254        }?;
255
256        // TODO: server side encryption
257
258        let endpoint = self
259            .config
260            .endpoint
261            .clone()
262            .unwrap_or_else(|| DEFAULT_GCS_ENDPOINT.to_string());
263        debug!("backend use endpoint: {endpoint}");
264
265        let mut cred_loader = GoogleCredentialLoader::default();
266        if let Some(cred) = &self.config.credential {
267            cred_loader = cred_loader.with_content(cred);
268        }
269        if let Some(cred) = &self.config.credential_path {
270            cred_loader = cred_loader.with_path(cred);
271        }
272        #[cfg(target_arch = "wasm32")]
273        {
274            cred_loader = cred_loader.with_disable_env();
275            cred_loader = cred_loader.with_disable_well_known_location();
276        }
277
278        if self.config.disable_config_load {
279            cred_loader = cred_loader
280                .with_disable_env()
281                .with_disable_well_known_location();
282        }
283
284        let scope = if let Some(scope) = &self.config.scope {
285            scope
286        } else {
287            DEFAULT_GCS_SCOPE
288        };
289
290        let mut token_loader = GoogleTokenLoader::new(scope, GLOBAL_REQWEST_CLIENT.clone());
291        if let Some(account) = &self.config.service_account {
292            token_loader = token_loader.with_service_account(account);
293        }
294        if let Ok(Some(cred)) = cred_loader.load() {
295            token_loader = token_loader.with_credentials(cred)
296        }
297        if let Some(loader) = self.customized_token_loader {
298            token_loader = token_loader.with_customized_token_loader(loader)
299        }
300
301        if self.config.disable_vm_metadata {
302            token_loader = token_loader.with_disable_vm_metadata(true);
303        }
304
305        let signer = GoogleSigner::new("storage");
306
307        let backend = GcsBackend {
308            core: Arc::new(GcsCore {
309                info: {
310                    let am = AccessorInfo::default();
311                    am.set_scheme(Scheme::Gcs)
312                        .set_root(&root)
313                        .set_name(bucket)
314                        .set_native_capability(Capability {
315                            stat: true,
316                            stat_with_if_match: true,
317                            stat_with_if_none_match: true,
318
319                            read: true,
320
321                            read_with_if_match: true,
322                            read_with_if_none_match: true,
323
324                            write: true,
325                            write_can_empty: true,
326                            write_can_multi: true,
327                            write_with_cache_control: true,
328                            write_with_content_type: true,
329                            write_with_content_encoding: true,
330                            write_with_user_metadata: true,
331                            write_with_if_not_exists: true,
332
333                            // The min multipart size of Gcs is 5 MiB.
334                            //
335                            // ref: <https://cloud.google.com/storage/docs/xml-api/put-object-multipart>
336                            write_multi_min_size: Some(5 * 1024 * 1024),
337                            // The max multipart size of Gcs is 5 GiB.
338                            //
339                            // ref: <https://cloud.google.com/storage/docs/xml-api/put-object-multipart>
340                            write_multi_max_size: if cfg!(target_pointer_width = "64") {
341                                Some(5 * 1024 * 1024 * 1024)
342                            } else {
343                                Some(usize::MAX)
344                            },
345
346                            delete: true,
347                            delete_max_size: Some(100),
348                            copy: true,
349
350                            list: true,
351                            list_with_limit: true,
352                            list_with_start_after: true,
353                            list_with_recursive: true,
354
355                            presign: true,
356                            presign_stat: true,
357                            presign_read: true,
358                            presign_write: true,
359
360                            shared: true,
361
362                            ..Default::default()
363                        });
364
365                    // allow deprecated api here for compatibility
366                    #[allow(deprecated)]
367                    if let Some(client) = self.http_client {
368                        am.update_http_client(|_| client);
369                    }
370
371                    am.into()
372                },
373                endpoint,
374                bucket: bucket.to_string(),
375                root,
376                signer,
377                token_loader,
378                token: self.config.token,
379                scope: scope.to_string(),
380                credential_loader: cred_loader,
381                predefined_acl: self.config.predefined_acl.clone(),
382                default_storage_class: self.config.default_storage_class.clone(),
383                allow_anonymous: self.config.allow_anonymous,
384            }),
385        };
386
387        Ok(backend)
388    }
389}
390
391/// GCS storage backend
392#[derive(Clone, Debug)]
393pub struct GcsBackend {
394    core: Arc<GcsCore>,
395}
396
397impl Access for GcsBackend {
398    type Reader = HttpBody;
399    type Writer = GcsWriters;
400    type Lister = oio::PageLister<GcsLister>;
401    type Deleter = oio::BatchDeleter<GcsDeleter>;
402
403    fn info(&self) -> Arc<AccessorInfo> {
404        self.core.info.clone()
405    }
406
407    async fn stat(&self, path: &str, args: OpStat) -> Result<RpStat> {
408        let resp = self.core.gcs_get_object_metadata(path, &args).await?;
409
410        if !resp.status().is_success() {
411            return Err(parse_error(resp));
412        }
413
414        let slc = resp.into_body();
415        let m = GcsCore::build_metadata_from_object_response(path, slc)?;
416
417        Ok(RpStat::new(m))
418    }
419
420    async fn read(&self, path: &str, args: OpRead) -> Result<(RpRead, Self::Reader)> {
421        let resp = self.core.gcs_get_object(path, args.range(), &args).await?;
422
423        let status = resp.status();
424
425        match status {
426            StatusCode::OK | StatusCode::PARTIAL_CONTENT => {
427                Ok((RpRead::default(), resp.into_body()))
428            }
429            _ => {
430                let (part, mut body) = resp.into_parts();
431                let buf = body.to_buffer().await?;
432                Err(parse_error(Response::from_parts(part, buf)))
433            }
434        }
435    }
436
437    async fn write(&self, path: &str, args: OpWrite) -> Result<(RpWrite, Self::Writer)> {
438        let concurrent = args.concurrent();
439        let w = GcsWriter::new(self.core.clone(), path, args);
440        let w = oio::MultipartWriter::new(self.core.info.clone(), w, concurrent);
441
442        Ok((RpWrite::default(), w))
443    }
444
445    async fn delete(&self) -> Result<(RpDelete, Self::Deleter)> {
446        Ok((
447            RpDelete::default(),
448            BatchDeleter::new(GcsDeleter::new(self.core.clone())),
449        ))
450    }
451
452    async fn list(&self, path: &str, args: OpList) -> Result<(RpList, Self::Lister)> {
453        let l = GcsLister::new(
454            self.core.clone(),
455            path,
456            args.recursive(),
457            args.limit(),
458            args.start_after(),
459        );
460
461        Ok((RpList::default(), oio::PageLister::new(l)))
462    }
463
464    async fn copy(&self, from: &str, to: &str, _: OpCopy) -> Result<RpCopy> {
465        let resp = self.core.gcs_copy_object(from, to).await?;
466
467        if resp.status().is_success() {
468            Ok(RpCopy::default())
469        } else {
470            Err(parse_error(resp))
471        }
472    }
473
474    async fn presign(&self, path: &str, args: OpPresign) -> Result<RpPresign> {
475        // We will not send this request out, just for signing.
476        let req = match args.operation() {
477            PresignOperation::Stat(v) => self.core.gcs_head_object_xml_request(path, v),
478            PresignOperation::Read(v) => self.core.gcs_get_object_xml_request(path, v),
479            PresignOperation::Write(v) => {
480                self.core
481                    .gcs_insert_object_xml_request(path, v, Buffer::new())
482            }
483            PresignOperation::Delete(_) => Err(Error::new(
484                ErrorKind::Unsupported,
485                "operation is not supported",
486            )),
487        };
488        let mut req = req?;
489        self.core.sign_query(&mut req, args.expire())?;
490
491        // We don't need this request anymore, consume it directly.
492        let (parts, _) = req.into_parts();
493
494        Ok(RpPresign::new(PresignedRequest::new(
495            parts.method,
496            parts.uri,
497            parts.headers,
498        )))
499    }
500}
opendal/services/gcs/backend.rs

opendal/services/gcs/
backend.rs
