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Simple (very!) datastore example.
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‎Examples/Datastore/PackageManager/Makefile‎

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LDFLAGS = -Xlinker -lz
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all:
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swift build -v $(LDFLAGS)
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cp .build/debug/Datastore .
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clean :
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rm -rf Packages googleapis .build
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rm -f Package.pins Datastore Sources/*.pb.swift Sources/swiftgrpc.log

‎Examples/Datastore/PackageManager/Package.swift‎

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/*
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*
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* Copyright 2017, Google Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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import PackageDescription
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let package = Package (
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name: "Datastore",
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dependencies: [
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.Package(url: "https://github.com/grpc/grpc-swift.git", Version(0,1,10)),
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.Package(url: "https://github.com/apple/swift-protobuf.git", Version(0,9,901)),
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]
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)

‎Examples/Datastore/PackageManager/README.md‎

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# Calling the Google Cloud Datastore API
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This directory contains a very simple sample that calls the
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[Google Cloud Datastore API](https://cloud.google.com/datastore/docs/reference/rpc/google.datastore.v1).
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Calls are made directly to the Datastore RPC interface.
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In practice, these would be wrapped in idiomatic code.
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Use [RUNME](RUNME) to generate the necessary Protocol Buffer
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and gRPC support code.
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Calls require a Google project ID and an OAuth token.
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Both should be specified in [Sources/main.swift](Sources/main.swift).
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To create a project ID, visit the
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[Google Cloud Console](https://cloud.google.com/console).
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One easy way to get an OAuth token is to use the
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[Instance Metadata Service](https://cloud.google.com/compute/docs/storing-retrieving-metadata)
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that is available in Google cloud instances, such as
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[Google Compute Engine](https://cloud.google.com/compute/)
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or
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[Google Cloud Shell](https://cloud.google.com/shell/docs/).
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This allows you to get a short-lived service token with curl:
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curl \
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http://metadata.google.internal/computeMetadata/v1/instance/service-accounts/default/token \
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-H Metadata-Flavor:Google
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That will return something like the following:
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{"access_token":"OAUTH ACCESS TOKEN","expires_in":1799,"token_type":"Bearer"}
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Put the string matching OAUTH ACCESS TOKEN in the `authToken` variable in
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[Sources/main.swift](Sources/main.swift).
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Please note that you must run the `curl` command from within a Google cloud instance.
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Once you have the OAuth token, you can use it from anywhere until it expires.
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CAUTION: Please take care to not share your OAuth token.
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It provides access to all of your Google services.

‎Examples/Datastore/PackageManager/RUNME‎

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#!/bin/sh
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#
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# Use this script to regenerate the Protocol Buffer and gRPC files
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# needed to build the example.
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#
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# Note that it requires updated protoc, protoc-gen-swift, and
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# protoc-gen-swiftgrpc binaries and assumes that protoc-gen-swift
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# is installed in $HOME/local/bin.
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git clone http://github.com/googleapis/googleapis
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protoc \
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googleapis/google/datastore/v1/datastore.proto \
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googleapis/google/datastore/v1/entity.proto \
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googleapis/google/datastore/v1/query.proto \
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googleapis/google/type/latlng.proto \
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-Igoogleapis \
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--swift_out=googleapis \
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--swift_opt=Visibility=Public \
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--plugin=$HOME/local/bin/protoc-gen-swift \
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--swiftgrpc_out=Sources
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# move swift files to this directory
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find googleapis -name "*.swift" -exec mv {} Sources \;
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# remove the grpc service file; we don't need it
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rm Sources/google.datastore.v1.server.pb.swift
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‎Examples/Datastore/PackageManager/Sources/main.swift‎

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/*
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*
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* Copyright 2017, Google Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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import Foundation
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import gRPC
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gRPC.initialize()
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let authToken = "<YOUR AUTH TOKEN>"
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let projectID = "<YOUR PROJECT ID>"
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let certificateURL = URL(fileURLWithPath:"roots.pem")
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let certificates = try! String(contentsOf: certificateURL)
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let service = Google_Datastore_V1_DatastoreService(address:"datastore.googleapis.com",
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certificates:certificates,
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host:nil)
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service.metadata = Metadata(["authorization":"Bearer " + authToken])
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var request = Google_Datastore_V1_RunQueryRequest()
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request.projectId = projectID
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var query = Google_Datastore_V1_GqlQuery()
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query.queryString = "select *"
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request.gqlQuery = query
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print("\(request)")
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let result = try service.runquery(request)
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print("\(result)")

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