app_flutter/lib/service/appengine_cocoon.dart - external/github.com/flutter/cocoon - Git at Google

 // Copyright 2019 The Flutter Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 import 'dart:convert';
 import 'dart:io';

 import 'package:flutter/foundation.dart' show kIsWeb, visibleForTesting;
 import 'package:http/http.dart' as http;
 import 'package:fixnum/fixnum.dart';

 import 'package:cocoon_service/protos.dart';

 import '../logic/qualified_task.dart';
 import 'cocoon.dart';
 import 'downloader.dart';

 /// CocoonService for interacting with flutter/flutter production build data.
 ///
 /// This queries API endpoints that are hosted on AppEngine.
 class AppEngineCocoonService implements CocoonService {
   /// Creates a new [AppEngineCocoonService].
   ///
   /// If a [client] is not specified, a new [http.Client] instance is created.
   AppEngineCocoonService({http.Client client, Downloader downloader})
       : _client = client ?? http.Client(),
         _downloader = downloader ?? Downloader();

   /// Branch on flutter/flutter to default requests for.
   final String _defaultBranch = 'master';

   /// The Cocoon API endpoint to query
   ///
   /// This is the base for all API requests to cocoon
   static const String _baseApiUrl = 'flutter-dashboard.appspot.com';

   final http.Client _client;

   final Downloader _downloader;

   @override
   Future<CocoonResponse<List<CommitStatus>>> fetchCommitStatuses({
     CommitStatus lastCommitStatus,
     String branch,
   }) async {
     final Map<String, String> queryParameters = <String, String>{
       if (lastCommitStatus != null) 'lastCommitKey': lastCommitStatus.commit.key.child.name,
       'branch': branch ?? _defaultBranch,
     };
     final String getStatusUrl = apiEndpoint('/api/public/get-status', queryParameters: queryParameters);

     /// This endpoint returns JSON [List<Agent>, List<CommitStatus>]
     final http.Response response = await _client.get(getStatusUrl);

     if (response.statusCode != HttpStatus.ok) {
       return CocoonResponse<List<CommitStatus>>.error('/api/public/get-status returned ${response.statusCode}');
     }

     try {
       final Map<String, Object> jsonResponse = jsonDecode(response.body);
       return CocoonResponse<List<CommitStatus>>.data(_commitStatusesFromJson(jsonResponse['Statuses']));
     } catch (error) {
       return CocoonResponse<List<CommitStatus>>.error(error.toString());
     }
   }

   @override
   Future<CocoonResponse<bool>> fetchTreeBuildStatus({
     String branch,
   }) async {
     final Map<String, String> queryParameters = <String, String>{
       'branch': branch ?? _defaultBranch,
     };
     final String getBuildStatusUrl = apiEndpoint('/api/public/build-status', queryParameters: queryParameters);

     /// This endpoint returns JSON {AnticipatedBuildStatus: [BuildStatus]}
     final http.Response response = await _client.get(getBuildStatusUrl);

     if (response.statusCode != HttpStatus.ok) {
       return CocoonResponse<bool>.error('/api/public/build-status returned ${response.statusCode}');
     }

     Map<String, Object> jsonResponse;
     try {
       jsonResponse = jsonDecode(response.body);
     } catch (error) {
       return const CocoonResponse<bool>.error('/api/public/build-status had a malformed response');
     }

     if (!_isBuildStatusResponseValid(jsonResponse)) {
       return const CocoonResponse<bool>.error('/api/public/build-status had a malformed response');
     }

     return CocoonResponse<bool>.data(jsonResponse['AnticipatedBuildStatus'] == 'Succeeded');
   }

   @override
   Future<CocoonResponse<List<Agent>>> fetchAgentStatuses() async {
     final String getStatusUrl = apiEndpoint('/api/public/get-status');

     /// This endpoint returns JSON [List<Agent>, List<CommitStatus>]
     final http.Response response = await _client.get(getStatusUrl);

     if (response.statusCode != HttpStatus.ok) {
       return CocoonResponse<List<Agent>>.error('/api/public/get-status returned ${response.statusCode}');
     }

     try {
       final Map<String, Object> jsonResponse = jsonDecode(response.body);
       return CocoonResponse<List<Agent>>.data(_agentStatusesFromJson(jsonResponse['AgentStatuses']));
     } catch (error) {
       return CocoonResponse<List<Agent>>.error(error.toString());
     }
   }

   @override
   Future<CocoonResponse<List<String>>> fetchFlutterBranches() async {
     final String getBranchesUrl = apiEndpoint('/api/public/get-branches');

     /// This endpoint returns JSON {"Branches": List<String>}
     final http.Response response = await _client.get(getBranchesUrl);

     if (response.statusCode != HttpStatus.ok) {
       return CocoonResponse<List<String>>.error('/api/public/get-branches returned ${response.statusCode}');
     }

     try {
       final Map<String, dynamic> jsonResponse = jsonDecode(response.body);
       final List<String> branches = jsonResponse['Branches'].cast<String>();
       return CocoonResponse<List<String>>.data(branches);
     } catch (error) {
       return CocoonResponse<List<String>>.error(error.toString());
     }
   }

   @override
   Future<bool> rerunTask(Task task, String idToken) async {
     assert(idToken != null);
     final String postResetTaskUrl = apiEndpoint('/api/reset-devicelab-task');

     /// This endpoint only returns a status code.
     final http.Response response = await _client.post(postResetTaskUrl,
         headers: <String, String>{
           'X-Flutter-IdToken': idToken,
         },
         body: jsonEncode(<String, String>{
           'Key': task.key.child.name,
         }));

     return response.statusCode == HttpStatus.ok;
   }

   /// Downloads the log for [task] to the local storage of the current device.
   /// Returns true if write was successful, and false if there was a failure.
   ///
   /// Only works on the web platform.
   @override
   Future<bool> downloadLog(Task task, String idToken, String commitSha) async {
     assert(task != null);
     assert(idToken != null);

     final Map<String, String> queryParameters = <String, String>{'ownerKey': task.key.child.name};
     final String getTaskLogUrl = apiEndpoint('/api/get-log', queryParameters: queryParameters);

     // Only show the first 7 characters of the commit sha. This amount is unique
     // enough to allow lookup of a commit.
     final String shortSha = commitSha.substring(0, 7);

     final String fileName = '${task.name}_${shortSha}_${task.attempts}.log';

     return _downloader.download(getTaskLogUrl, fileName, idToken: idToken);
   }

   @override
   Future<CocoonResponse<String>> createAgent(String agentId, List<String> capabilities, String idToken) async {
     assert(agentId != null);
     assert(capabilities.isNotEmpty);
     assert(idToken != null);

     final String createAgentUrl = apiEndpoint('/api/create-agent');

     /// This endpoint returns JSON {'Token': [Token]}
     final http.Response response = await _client.post(
       createAgentUrl,
       headers: <String, String>{'X-Flutter-IdToken': idToken},
       body: jsonEncode(<String, Object>{
         'AgentID': agentId,
         'Capabilities': capabilities,
       }),
     );

     if (response.statusCode != HttpStatus.ok) {
       return const CocoonResponse<String>.error('/api/create-agent did not respond with 200');
     }

     Map<String, Object> responseBody;
     try {
       responseBody = jsonDecode(response.body);
       if (responseBody['Token'] == null) {
         return const CocoonResponse<String>.error('/api/create-agent returned unexpected response');
       }
     } catch (e) {
       return const CocoonResponse<String>.error('/api/create-agent returned unexpected response');
     }

     return CocoonResponse<String>.data(responseBody['Token']);
   }

   @override
   Future<CocoonResponse<String>> authorizeAgent(Agent agent, String idToken) async {
     assert(agent != null);
     assert(idToken != null);

     final String authorizeAgentUrl = apiEndpoint('/api/authorize-agent');

     /// This endpoint returns JSON {'Token': [Token]}
     final http.Response response = await _client.post(
       authorizeAgentUrl,
       headers: <String, String>{'X-Flutter-IdToken': idToken},
       body: jsonEncode(<String, Object>{
         'AgentID': agent.agentId,
       }),
     );

     if (response.statusCode != HttpStatus.ok) {
       return const CocoonResponse<String>.error('/api/authorize-agent did not respond with 200');
     }

     Map<String, Object> responseBody;
     try {
       responseBody = jsonDecode(response.body);
       if (responseBody['Token'] == null) {
         return const CocoonResponse<String>.error('/api/authorize-agent returned unexpected response');
       }
     } catch (e) {
       return const CocoonResponse<String>.error('/api/authorize-agent returned unexpected response');
     }

     return CocoonResponse<String>.data(responseBody['Token']);
   }

   @override
   Future<void> reserveTask(Agent agent, String idToken) async {
     assert(agent != null);
     assert(idToken != null);

     final String reserveTaskUrl = apiEndpoint('/api/reserve-task');

     final http.Response response = await _client.post(
       reserveTaskUrl,
       headers: <String, String>{'X-Flutter-IdToken': idToken},
       body: jsonEncode(<String, Object>{
         'AgentID': agent.agentId,
       }),
     );

     if (response.statusCode != HttpStatus.ok) {
       throw Exception('/api/reserve-task did not respond with 200');
     }

     Map<String, Object> responseBody;
     try {
       responseBody = jsonDecode(response.body);
       if (responseBody['Task'] == null) {
         throw Exception('/api/reserve-task returned unexpected response');
       }
     } catch (e) {
       throw Exception('/api/reserve-task returned unexpected response');
     }
   }

   /// Construct the API endpoint based on the priority of using a local endpoint
   /// before falling back to the production endpoint.
   ///
   /// This functions resolves the relative url endpoint to the production endpoint
   /// that can be used on web to the production endpoint if running not on web.
   /// This is because only on web a Cocoon backend can be running from the same
   /// host as this Flutter application, but on mobile we need to ping a separate
   /// production endpoint.
   ///
   /// The urlSuffix begins with a slash, e.g. "/api/public/get-status".
   ///
   /// [queryParameters] are appended to the url and are url encoded.
   @visibleForTesting
   String apiEndpoint(
     String urlSuffix, {
     Map<String, String> queryParameters,
   }) {
     final Uri uri = Uri.https(_baseApiUrl, urlSuffix, queryParameters);
     final String url = uri.toString();

     return kIsWeb ? url.replaceAll('https://$_baseApiUrl', '') : url;
   }

   /// Check if [Map<String,Object>] follows the format for build-status.
   ///
   /// Template of the response it should receive:
   /// ```json
   /// {
   ///   "AnticipatedBuildStatus": "Succeeded"|"Failed"
   /// }
   /// ```
   bool _isBuildStatusResponseValid(Map<String, Object> response) {
     if (!response.containsKey('AnticipatedBuildStatus')) {
       return false;
     }

     final String treeBuildStatus = response['AnticipatedBuildStatus'];
     if (treeBuildStatus != 'Failed' && treeBuildStatus != 'Succeeded') {
       return false;
     }

     return true;
   }

   List<Agent> _agentStatusesFromJson(List<Object> jsonAgentStatuses) {
     final List<Agent> agents = <Agent>[];

     for (final Map<String, Object> jsonAgent in jsonAgentStatuses) {
       final List<Object> objectCapabilities = jsonAgent['Capabilities'];
       final List<String> capabilities = objectCapabilities.map((Object value) => value.toString()).toList();
       final Agent agent = Agent()
         ..agentId = jsonAgent['AgentID']
         ..healthCheckTimestamp = Int64.parseInt(jsonAgent['HealthCheckTimestamp'].toString())
         ..isHealthy = jsonAgent['IsHealthy']
         ..capabilities.addAll(capabilities)
         ..healthDetails = jsonAgent['HealthDetails'];
       agents.add(agent);
     }

     return agents;
   }

   List<CommitStatus> _commitStatusesFromJson(List<Object> jsonCommitStatuses) {
     assert(jsonCommitStatuses != null);
     // TODO(chillers): Remove adapter code to just use proto fromJson method. https://github.com/flutter/cocoon/issues/441

     final List<CommitStatus> statuses = <CommitStatus>[];

     for (final Map<String, Object> jsonCommitStatus in jsonCommitStatuses) {
       final Map<String, Object> checklist = jsonCommitStatus['Checklist'];
       statuses.add(CommitStatus()
         ..commit = _commitFromJson(checklist)
         ..branch = _branchFromJson(checklist)
         ..stages.addAll(_stagesFromJson(jsonCommitStatus['Stages'])));
     }

     return statuses;
   }

   String _branchFromJson(Map<String, Object> jsonChecklist) {
     assert(jsonChecklist != null);

     final Map<String, Object> checklist = jsonChecklist['Checklist'];
     return checklist['Branch'];
   }

   Commit _commitFromJson(Map<String, Object> jsonChecklist) {
     assert(jsonChecklist != null);

     final Map<String, Object> checklist = jsonChecklist['Checklist'];

     final Map<String, Object> commit = checklist['Commit'];
     final Map<String, Object> author = commit['Author'];

     return Commit()
       ..key = (RootKey()..child = (Key()..name = jsonChecklist['Key']))
       ..timestamp = Int64() + checklist['CreateTimestamp']
       ..sha = commit['Sha']
       ..author = author['Login']
       ..authorAvatarUrl = author['avatar_url']
       ..repository = checklist['FlutterRepositoryPath']
       ..branch = checklist['Branch'];
   }

   List<Stage> _stagesFromJson(List<Object> json) {
     assert(json != null);
     final List<Stage> stages = <Stage>[];

     for (final Object jsonStage in json) {
       stages.add(_stageFromJson(jsonStage));
     }

     return stages;
   }

   Stage _stageFromJson(Map<String, Object> json) {
     assert(json != null);
     return Stage()
       ..name = json['Name']
       ..tasks.addAll(_tasksFromJson(json['Tasks']))
       ..taskStatus = json['Status'];
   }

   List<Task> _tasksFromJson(List<Object> json) {
     assert(json != null);
     final List<Task> tasks = <Task>[];

     for (final Map<String, Object> jsonTask in json) {
       tasks.add(_taskFromJson(jsonTask));
     }

     return tasks;
   }

   Task _taskFromJson(Map<String, Object> json) {
     assert(json != null);

     final Map<String, Object> taskData = json['Task'];
     final List<Object> objectRequiredCapabilities = taskData['RequiredCapabilities'];

     final Task task = Task()
       ..key = (RootKey()..child = (Key()..name = json['Key']))
       ..createTimestamp = Int64(taskData['CreateTimestamp'])
       ..startTimestamp = Int64(taskData['StartTimestamp'])
       ..endTimestamp = Int64(taskData['EndTimestamp'])
       ..name = taskData['Name']
       ..attempts = taskData['Attempts']
       ..isFlaky = taskData['Flaky']
       ..timeoutInMinutes = taskData['TimeoutInMinutes']
       ..reason = taskData['Reason']
       ..requiredCapabilities.add(objectRequiredCapabilities.toString())
       ..reservedForAgentId = taskData['ReservedForAgentID']
       ..stageName = taskData['StageName']
       ..status = taskData['Status'];

     if (taskData['StageName'] == StageName.luci) {
       task
         ..buildNumberList = taskData['BuildNumberList'] ?? ''
         ..builderName = taskData['BuilderName'] ?? ''
         ..luciBucket = taskData['LuciBucket'] ?? '';
     }
     return task;
   }
 }
	// Copyright 2019 The Flutter Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	import 'dart:convert';
	import 'dart:io';

	import 'package:flutter/foundation.dart' show kIsWeb, visibleForTesting;
	import 'package:http/http.dart' as http;
	import 'package:fixnum/fixnum.dart';

	import 'package:cocoon_service/protos.dart';

	import '../logic/qualified_task.dart';
	import 'cocoon.dart';
	import 'downloader.dart';

	/// CocoonService for interacting with flutter/flutter production build data.
	///
	/// This queries API endpoints that are hosted on AppEngine.
	class AppEngineCocoonService implements CocoonService {
	/// Creates a new [AppEngineCocoonService].
	///
	/// If a [client] is not specified, a new [http.Client] instance is created.
	AppEngineCocoonService({http.Client client, Downloader downloader})
	: _client = client ?? http.Client(),
	_downloader = downloader ?? Downloader();

	/// Branch on flutter/flutter to default requests for.
	final String _defaultBranch = 'master';

	/// The Cocoon API endpoint to query
	///
	/// This is the base for all API requests to cocoon
	static const String _baseApiUrl = 'flutter-dashboard.appspot.com';

	final http.Client _client;

	final Downloader _downloader;

	@override
	Future<CocoonResponse<List<CommitStatus>>> fetchCommitStatuses({
	CommitStatus lastCommitStatus,
	String branch,
	}) async {
	final Map<String, String> queryParameters = <String, String>{
	if (lastCommitStatus != null) 'lastCommitKey': lastCommitStatus.commit.key.child.name,
	'branch': branch ?? _defaultBranch,
	};
	final String getStatusUrl = apiEndpoint('/api/public/get-status', queryParameters: queryParameters);

	/// This endpoint returns JSON [List<Agent>, List<CommitStatus>]
	final http.Response response = await _client.get(getStatusUrl);

	if (response.statusCode != HttpStatus.ok) {
	return CocoonResponse<List<CommitStatus>>.error('/api/public/get-status returned ${response.statusCode}');
	}

	try {
	final Map<String, Object> jsonResponse = jsonDecode(response.body);
	return CocoonResponse<List<CommitStatus>>.data(_commitStatusesFromJson(jsonResponse['Statuses']));
	} catch (error) {
	return CocoonResponse<List<CommitStatus>>.error(error.toString());
	}
	}

	@override
	Future<CocoonResponse<bool>> fetchTreeBuildStatus({
	String branch,
	}) async {
	final Map<String, String> queryParameters = <String, String>{
	'branch': branch ?? _defaultBranch,
	};
	final String getBuildStatusUrl = apiEndpoint('/api/public/build-status', queryParameters: queryParameters);

	/// This endpoint returns JSON {AnticipatedBuildStatus: [BuildStatus]}
	final http.Response response = await _client.get(getBuildStatusUrl);

	if (response.statusCode != HttpStatus.ok) {
	return CocoonResponse<bool>.error('/api/public/build-status returned ${response.statusCode}');
	}

	Map<String, Object> jsonResponse;
	try {
	jsonResponse = jsonDecode(response.body);
	} catch (error) {
	return const CocoonResponse<bool>.error('/api/public/build-status had a malformed response');
	}

	if (!_isBuildStatusResponseValid(jsonResponse)) {
	return const CocoonResponse<bool>.error('/api/public/build-status had a malformed response');
	}

	return CocoonResponse<bool>.data(jsonResponse['AnticipatedBuildStatus'] == 'Succeeded');
	}

	@override
	Future<CocoonResponse<List<Agent>>> fetchAgentStatuses() async {
	final String getStatusUrl = apiEndpoint('/api/public/get-status');

	/// This endpoint returns JSON [List<Agent>, List<CommitStatus>]
	final http.Response response = await _client.get(getStatusUrl);

	if (response.statusCode != HttpStatus.ok) {
	return CocoonResponse<List<Agent>>.error('/api/public/get-status returned ${response.statusCode}');
	}

	try {
	final Map<String, Object> jsonResponse = jsonDecode(response.body);
	return CocoonResponse<List<Agent>>.data(_agentStatusesFromJson(jsonResponse['AgentStatuses']));
	} catch (error) {
	return CocoonResponse<List<Agent>>.error(error.toString());
	}
	}

	@override
	Future<CocoonResponse<List<String>>> fetchFlutterBranches() async {
	final String getBranchesUrl = apiEndpoint('/api/public/get-branches');

	/// This endpoint returns JSON {"Branches": List<String>}
	final http.Response response = await _client.get(getBranchesUrl);

	if (response.statusCode != HttpStatus.ok) {
	return CocoonResponse<List<String>>.error('/api/public/get-branches returned ${response.statusCode}');
	}

	try {
	final Map<String, dynamic> jsonResponse = jsonDecode(response.body);
	final List<String> branches = jsonResponse['Branches'].cast<String>();
	return CocoonResponse<List<String>>.data(branches);
	} catch (error) {
	return CocoonResponse<List<String>>.error(error.toString());
	}
	}

	@override
	Future<bool> rerunTask(Task task, String idToken) async {
	assert(idToken != null);
	final String postResetTaskUrl = apiEndpoint('/api/reset-devicelab-task');

	/// This endpoint only returns a status code.
	final http.Response response = await _client.post(postResetTaskUrl,
	headers: <String, String>{
	'X-Flutter-IdToken': idToken,
	},
	body: jsonEncode(<String, String>{
	'Key': task.key.child.name,
	}));

	return response.statusCode == HttpStatus.ok;
	}

	/// Downloads the log for [task] to the local storage of the current device.
	/// Returns true if write was successful, and false if there was a failure.
	///
	/// Only works on the web platform.
	@override
	Future<bool> downloadLog(Task task, String idToken, String commitSha) async {
	assert(task != null);
	assert(idToken != null);

	final Map<String, String> queryParameters = <String, String>{'ownerKey': task.key.child.name};
	final String getTaskLogUrl = apiEndpoint('/api/get-log', queryParameters: queryParameters);

	// Only show the first 7 characters of the commit sha. This amount is unique
	// enough to allow lookup of a commit.
	final String shortSha = commitSha.substring(0, 7);

	final String fileName = '${task.name}_${shortSha}_${task.attempts}.log';

	return _downloader.download(getTaskLogUrl, fileName, idToken: idToken);
	}

	@override
	Future<CocoonResponse<String>> createAgent(String agentId, List<String> capabilities, String idToken) async {
	assert(agentId != null);
	assert(capabilities.isNotEmpty);
	assert(idToken != null);

	final String createAgentUrl = apiEndpoint('/api/create-agent');

	/// This endpoint returns JSON {'Token': [Token]}
	final http.Response response = await _client.post(
	createAgentUrl,
	headers: <String, String>{'X-Flutter-IdToken': idToken},
	body: jsonEncode(<String, Object>{
	'AgentID': agentId,
	'Capabilities': capabilities,
	}),
	);

	if (response.statusCode != HttpStatus.ok) {
	return const CocoonResponse<String>.error('/api/create-agent did not respond with 200');
	}

	Map<String, Object> responseBody;
	try {
	responseBody = jsonDecode(response.body);
	if (responseBody['Token'] == null) {
	return const CocoonResponse<String>.error('/api/create-agent returned unexpected response');
	}
	} catch (e) {
	return const CocoonResponse<String>.error('/api/create-agent returned unexpected response');
	}

	return CocoonResponse<String>.data(responseBody['Token']);
	}

	@override
	Future<CocoonResponse<String>> authorizeAgent(Agent agent, String idToken) async {
	assert(agent != null);
	assert(idToken != null);

	final String authorizeAgentUrl = apiEndpoint('/api/authorize-agent');

	/// This endpoint returns JSON {'Token': [Token]}
	final http.Response response = await _client.post(
	authorizeAgentUrl,
	headers: <String, String>{'X-Flutter-IdToken': idToken},
	body: jsonEncode(<String, Object>{
	'AgentID': agent.agentId,
	}),
	);

	if (response.statusCode != HttpStatus.ok) {
	return const CocoonResponse<String>.error('/api/authorize-agent did not respond with 200');
	}

	Map<String, Object> responseBody;
	try {
	responseBody = jsonDecode(response.body);
	if (responseBody['Token'] == null) {
	return const CocoonResponse<String>.error('/api/authorize-agent returned unexpected response');
	}
	} catch (e) {
	return const CocoonResponse<String>.error('/api/authorize-agent returned unexpected response');
	}

	return CocoonResponse<String>.data(responseBody['Token']);
	}

	@override
	Future<void> reserveTask(Agent agent, String idToken) async {
	assert(agent != null);
	assert(idToken != null);

	final String reserveTaskUrl = apiEndpoint('/api/reserve-task');

	final http.Response response = await _client.post(
	reserveTaskUrl,
	headers: <String, String>{'X-Flutter-IdToken': idToken},
	body: jsonEncode(<String, Object>{
	'AgentID': agent.agentId,
	}),
	);

	if (response.statusCode != HttpStatus.ok) {
	throw Exception('/api/reserve-task did not respond with 200');
	}

	Map<String, Object> responseBody;
	try {
	responseBody = jsonDecode(response.body);
	if (responseBody['Task'] == null) {
	throw Exception('/api/reserve-task returned unexpected response');
	}
	} catch (e) {
	throw Exception('/api/reserve-task returned unexpected response');
	}
	}

	/// Construct the API endpoint based on the priority of using a local endpoint
	/// before falling back to the production endpoint.
	///
	/// This functions resolves the relative url endpoint to the production endpoint
	/// that can be used on web to the production endpoint if running not on web.
	/// This is because only on web a Cocoon backend can be running from the same
	/// host as this Flutter application, but on mobile we need to ping a separate
	/// production endpoint.
	///
	/// The urlSuffix begins with a slash, e.g. "/api/public/get-status".
	///
	/// [queryParameters] are appended to the url and are url encoded.
	@visibleForTesting
	String apiEndpoint(
	String urlSuffix, {
	Map<String, String> queryParameters,
	}) {
	final Uri uri = Uri.https(_baseApiUrl, urlSuffix, queryParameters);
	final String url = uri.toString();

	return kIsWeb ? url.replaceAll('https://$_baseApiUrl', '') : url;
	}

	/// Check if [Map<String,Object>] follows the format for build-status.
	///
	/// Template of the response it should receive:
	/// ```json
	/// {
	/// "AnticipatedBuildStatus": "Succeeded"\|"Failed"
	/// }
	/// ```
	bool _isBuildStatusResponseValid(Map<String, Object> response) {
	if (!response.containsKey('AnticipatedBuildStatus')) {
	return false;
	}

	final String treeBuildStatus = response['AnticipatedBuildStatus'];
	if (treeBuildStatus != 'Failed' && treeBuildStatus != 'Succeeded') {
	return false;
	}

	return true;
	}

	List<Agent> _agentStatusesFromJson(List<Object> jsonAgentStatuses) {
	final List<Agent> agents = <Agent>[];

	for (final Map<String, Object> jsonAgent in jsonAgentStatuses) {
	final List<Object> objectCapabilities = jsonAgent['Capabilities'];
	final List<String> capabilities = objectCapabilities.map((Object value) => value.toString()).toList();
	final Agent agent = Agent()
	..agentId = jsonAgent['AgentID']
	..healthCheckTimestamp = Int64.parseInt(jsonAgent['HealthCheckTimestamp'].toString())
	..isHealthy = jsonAgent['IsHealthy']
	..capabilities.addAll(capabilities)
	..healthDetails = jsonAgent['HealthDetails'];
	agents.add(agent);
	}

	return agents;
	}

	List<CommitStatus> _commitStatusesFromJson(List<Object> jsonCommitStatuses) {
	assert(jsonCommitStatuses != null);
	// TODO(chillers): Remove adapter code to just use proto fromJson method. https://github.com/flutter/cocoon/issues/441

	final List<CommitStatus> statuses = <CommitStatus>[];

	for (final Map<String, Object> jsonCommitStatus in jsonCommitStatuses) {
	final Map<String, Object> checklist = jsonCommitStatus['Checklist'];
	statuses.add(CommitStatus()
	..commit = _commitFromJson(checklist)
	..branch = _branchFromJson(checklist)
	..stages.addAll(_stagesFromJson(jsonCommitStatus['Stages'])));
	}

	return statuses;
	}

	String _branchFromJson(Map<String, Object> jsonChecklist) {
	assert(jsonChecklist != null);

	final Map<String, Object> checklist = jsonChecklist['Checklist'];
	return checklist['Branch'];
	}

	Commit _commitFromJson(Map<String, Object> jsonChecklist) {
	assert(jsonChecklist != null);

	final Map<String, Object> checklist = jsonChecklist['Checklist'];

	final Map<String, Object> commit = checklist['Commit'];
	final Map<String, Object> author = commit['Author'];

	return Commit()
	..key = (RootKey()..child = (Key()..name = jsonChecklist['Key']))
	..timestamp = Int64() + checklist['CreateTimestamp']
	..sha = commit['Sha']
	..author = author['Login']
	..authorAvatarUrl = author['avatar_url']
	..repository = checklist['FlutterRepositoryPath']
	..branch = checklist['Branch'];
	}

	List<Stage> _stagesFromJson(List<Object> json) {
	assert(json != null);
	final List<Stage> stages = <Stage>[];

	for (final Object jsonStage in json) {
	stages.add(_stageFromJson(jsonStage));
	}

	return stages;
	}

	Stage _stageFromJson(Map<String, Object> json) {
	assert(json != null);
	return Stage()
	..name = json['Name']
	..tasks.addAll(_tasksFromJson(json['Tasks']))
	..taskStatus = json['Status'];
	}

	List<Task> _tasksFromJson(List<Object> json) {
	assert(json != null);
	final List<Task> tasks = <Task>[];

	for (final Map<String, Object> jsonTask in json) {
	tasks.add(_taskFromJson(jsonTask));
	}

	return tasks;
	}

	Task _taskFromJson(Map<String, Object> json) {
	assert(json != null);

	final Map<String, Object> taskData = json['Task'];
	final List<Object> objectRequiredCapabilities = taskData['RequiredCapabilities'];

	final Task task = Task()
	..key = (RootKey()..child = (Key()..name = json['Key']))
	..createTimestamp = Int64(taskData['CreateTimestamp'])
	..startTimestamp = Int64(taskData['StartTimestamp'])
	..endTimestamp = Int64(taskData['EndTimestamp'])
	..name = taskData['Name']
	..attempts = taskData['Attempts']
	..isFlaky = taskData['Flaky']
	..timeoutInMinutes = taskData['TimeoutInMinutes']
	..reason = taskData['Reason']
	..requiredCapabilities.add(objectRequiredCapabilities.toString())
	..reservedForAgentId = taskData['ReservedForAgentID']
	..stageName = taskData['StageName']
	..status = taskData['Status'];

	if (taskData['StageName'] == StageName.luci) {
	task
	..buildNumberList = taskData['BuildNumberList'] ?? ''
	..builderName = taskData['BuilderName'] ?? ''
	..luciBucket = taskData['LuciBucket'] ?? '';
	}
	return task;
	}
	}