blob: 0481f7effdfadce5c51ed2ca6b1dd1857a576726 [file] [log] [blame]
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
import Dispatch
import Foundation
import OAuth2
struct ListFilesResponse: Codable {
struct Item: Codable {
let kind: String
let selfLink: String
let mediaLink: String
let name: String
let bucket: String
let size: String
}
let kind: String
let items: [Item]
}
public struct GoogleStorage: FileIOSource {
public static func readFiles(matching: PCollection<KV<String, String>>) -> PCollection<Data> {
matching.pstream(type: .bounded) { matching, output in
guard let tokenProvider = DefaultTokenProvider(scopes: ["storage.objects.get"]) else {
throw ApacheBeamError.runtimeError("Unable to get OAuth2 token.")
}
let connection = Connection(provider: tokenProvider)
for await (file, ts, w) in matching {
let bucket = file.key
for name in file.values {
let url = "https://storage.googleapis.com/storage/v1/b/\(bucket)/o/\(name.addingPercentEncoding(withAllowedCharacters: .urlHostAllowed)!)"
let response: Data? = try await withCheckedThrowingContinuation { continuation in
do {
try connection.performRequest(method: "GET",
urlString: url,
parameters: ["alt": "media"], body: nil)
{
data, _, error in
if let e = error {
continuation.resume(throwing: e)
} else {
continuation.resume(returning: data)
}
}
} catch {
continuation.resume(throwing: error)
}
}
if let d = response {
output.emit(d, timestamp: ts, window: w)
}
}
}
}
}
/// Match files in a Google Cloud Storage Bucket matching the prefix given by `(bucket,prefix)` string pairs.
///
/// Note: Currently only the DefaultTokenProvider is supported.
///
/// - Parameter matching: A ``PCollection`` of `(bucket,prefix)` pairs.
/// - Returns: A ``PCollection`` of `(bucket,file)` pairs.
public static func listFiles(matching: PCollection<KV<String, String>>) -> PCollection<KV<String, String>> {
matching.pstream(type: .bounded) { matching, output in
guard let tokenProvider = DefaultTokenProvider(scopes: ["storage.objects.list"]) else {
throw ApacheBeamError.runtimeError("Unable to get OAuth2 token.")
}
let connection = Connection(provider: tokenProvider)
for await (match, ts, w) in matching {
let bucket = match.key
for prefix in match.values {
let response: Data? = try await withCheckedThrowingContinuation { continuation in
do {
try connection.performRequest(
method: "GET",
urlString: "https://storage.googleapis.com/storage/v1/b/\(bucket)/o",
parameters: ["prefix": prefix],
body: nil
) { data, _, error in
if let e = error {
continuation.resume(throwing: e)
} else {
continuation.resume(returning: data)
}
}
} catch {
continuation.resume(throwing: error)
}
}
if let data = response {
let listfiles = try JSONDecoder().decode(ListFilesResponse.self, from: data)
for item in listfiles.items {
if item.size != "0" {
output.emit(KV(item.bucket, item.name), timestamp: ts, window: w)
}
}
}
}
}
}
}
}