Clean up sys.json

.editorconfig

@@ -0,0 +1,226 @@
+# Remove the line below if you want to inherit .editorconfig settings from higher directories
+root = true
+
+# C# files
+[*.cs]
+
+#### Core EditorConfig Options ####
+
+# Indentation and spacing
+indent_size = 4
+indent_style = tab
+tab_width = 4
+
+# New line preferences
+end_of_line = crlf
+insert_final_newline = false
+
+#### .NET Coding Conventions ####
+
+# Organize usings
+dotnet_separate_import_directive_groups = false
+dotnet_sort_system_directives_first = true
+file_header_template = unset
+
+# this. and Me. preferences
+dotnet_style_qualification_for_event = false
+dotnet_style_qualification_for_field = false
+dotnet_style_qualification_for_method = false
+dotnet_style_qualification_for_property = false
+
+# Language keywords vs BCL types preferences
+dotnet_style_predefined_type_for_locals_parameters_members = true
+dotnet_style_predefined_type_for_member_access = true
+
+# Parentheses preferences
+dotnet_style_parentheses_in_arithmetic_binary_operators = always_for_clarity
+dotnet_style_parentheses_in_other_binary_operators = always_for_clarity
+dotnet_style_parentheses_in_other_operators = never_if_unnecessary
+dotnet_style_parentheses_in_relational_binary_operators = always_for_clarity
+
+# Modifier preferences
+dotnet_style_require_accessibility_modifiers = for_non_interface_members
+
+# Expression-level preferences
+dotnet_style_coalesce_expression = true
+dotnet_style_collection_initializer = true
+dotnet_style_explicit_tuple_names = true
+dotnet_style_namespace_match_folder = true
+dotnet_style_null_propagation = true
+dotnet_style_object_initializer = true
+dotnet_style_operator_placement_when_wrapping = beginning_of_line
+dotnet_style_prefer_auto_properties = true
+dotnet_style_prefer_compound_assignment = true
+dotnet_style_prefer_conditional_expression_over_assignment = true
+dotnet_style_prefer_conditional_expression_over_return = true
+dotnet_style_prefer_foreach_explicit_cast_in_source = when_strongly_typed
+dotnet_style_prefer_inferred_anonymous_type_member_names = true
+dotnet_style_prefer_inferred_tuple_names = true
+dotnet_style_prefer_is_null_check_over_reference_equality_method = true
+dotnet_style_prefer_simplified_boolean_expressions = true
+dotnet_style_prefer_simplified_interpolation = true
+
+# Field preferences
+dotnet_style_readonly_field = true
+
+# Parameter preferences
+dotnet_code_quality_unused_parameters = all
+
+# Suppression preferences
+dotnet_remove_unnecessary_suppression_exclusions = none
+
+# New line preferences
+dotnet_style_allow_multiple_blank_lines_experimental = false
+dotnet_style_allow_statement_immediately_after_block_experimental = false
+
+#### C# Coding Conventions ####
+
+# var preferences
+csharp_style_var_elsewhere = true
+csharp_style_var_for_built_in_types = true
+csharp_style_var_when_type_is_apparent = true
+
+# Expression-bodied members
+csharp_style_expression_bodied_accessors = true
+csharp_style_expression_bodied_constructors = false
+csharp_style_expression_bodied_indexers = true
+csharp_style_expression_bodied_lambdas = true
+csharp_style_expression_bodied_local_functions = false
+csharp_style_expression_bodied_methods = false
+csharp_style_expression_bodied_operators = false
+csharp_style_expression_bodied_properties = true
+
+# Pattern matching preferences
+csharp_style_pattern_matching_over_as_with_null_check = true
+csharp_style_pattern_matching_over_is_with_cast_check = true
+csharp_style_prefer_extended_property_pattern = true
+csharp_style_prefer_not_pattern = true
+csharp_style_prefer_pattern_matching = true
+csharp_style_prefer_switch_expression = true
+
+# Null-checking preferences
+csharp_style_conditional_delegate_call = true
+
+# Modifier preferences
+csharp_prefer_static_local_function = true
+csharp_preferred_modifier_order = public,private,protected,internal,file,static,extern,new,virtual,abstract,sealed,override,readonly,unsafe,required,volatile,async
+csharp_style_prefer_readonly_struct = true
+
+# Code-block preferences
+csharp_prefer_braces = when_multiline
+csharp_prefer_simple_using_statement = true
+csharp_style_namespace_declarations = file_scoped
+csharp_style_prefer_method_group_conversion = true
+csharp_style_prefer_top_level_statements = true
+
+# Expression-level preferences
+csharp_prefer_simple_default_expression = true
+csharp_style_deconstructed_variable_declaration = true
+csharp_style_implicit_object_creation_when_type_is_apparent = true
+csharp_style_inlined_variable_declaration = true
+csharp_style_prefer_index_operator = true
+csharp_style_prefer_local_over_anonymous_function = true
+csharp_style_prefer_null_check_over_type_check = true
+csharp_style_prefer_range_operator = true
+csharp_style_prefer_tuple_swap = true
+csharp_style_prefer_utf8_string_literals = true
+csharp_style_throw_expression = true
+csharp_style_unused_value_assignment_preference = discard_variable
+csharp_style_unused_value_expression_statement_preference = discard_variable
+
+# 'using' directive preferences
+csharp_using_directive_placement = outside_namespace
+
+# New line preferences
+csharp_style_allow_blank_line_after_colon_in_constructor_initializer_experimental = true
+csharp_style_allow_blank_lines_between_consecutive_braces_experimental = false
+csharp_style_allow_embedded_statements_on_same_line_experimental = false
+
+#### C# Formatting Rules ####
+
+# New line preferences
+csharp_new_line_before_catch = true
+csharp_new_line_before_else = true
+csharp_new_line_before_finally = true
+csharp_new_line_before_members_in_anonymous_types = true
+csharp_new_line_before_members_in_object_initializers = true
+csharp_new_line_before_open_brace = all
+csharp_new_line_between_query_expression_clauses = true
+
+# Indentation preferences
+csharp_indent_block_contents = true
+csharp_indent_braces = false
+csharp_indent_case_contents = true
+csharp_indent_case_contents_when_block = true
+csharp_indent_labels = one_less_than_current
+csharp_indent_switch_labels = true
+
+# Space preferences
+csharp_space_after_cast = false
+csharp_space_after_colon_in_inheritance_clause = true
+csharp_space_after_comma = true
+csharp_space_after_dot = false
+csharp_space_after_keywords_in_control_flow_statements = true
+csharp_space_after_semicolon_in_for_statement = true
+csharp_space_around_binary_operators = before_and_after
+csharp_space_around_declaration_statements = false
+csharp_space_before_colon_in_inheritance_clause = true
+csharp_space_before_comma = false
+csharp_space_before_dot = false
+csharp_space_before_open_square_brackets = false
+csharp_space_before_semicolon_in_for_statement = false
+csharp_space_between_empty_square_brackets = false
+csharp_space_between_method_call_empty_parameter_list_parentheses = false
+csharp_space_between_method_call_name_and_opening_parenthesis = false
+csharp_space_between_method_call_parameter_list_parentheses = false
+csharp_space_between_method_declaration_empty_parameter_list_parentheses = false
+csharp_space_between_method_declaration_name_and_open_parenthesis = false
+csharp_space_between_method_declaration_parameter_list_parentheses = false
+csharp_space_between_parentheses = false
+csharp_space_between_square_brackets = false
+
+# Wrapping preferences
+csharp_preserve_single_line_blocks = true
+csharp_preserve_single_line_statements = false
+
+#### Naming styles ####
+
+# Naming rules
+
+dotnet_naming_rule.interface_should_be_begins_with_i.severity = suggestion
+dotnet_naming_rule.interface_should_be_begins_with_i.symbols = interface
+dotnet_naming_rule.interface_should_be_begins_with_i.style = begins_with_i
+
+dotnet_naming_rule.types_should_be_pascal_case.severity = suggestion
+dotnet_naming_rule.types_should_be_pascal_case.symbols = types
+dotnet_naming_rule.types_should_be_pascal_case.style = pascal_case
+
+dotnet_naming_rule.non_field_members_should_be_pascal_case.severity = suggestion
+dotnet_naming_rule.non_field_members_should_be_pascal_case.symbols = non_field_members
+dotnet_naming_rule.non_field_members_should_be_pascal_case.style = pascal_case
+
+# Symbol specifications
+
+dotnet_naming_symbols.interface.applicable_kinds = interface
+dotnet_naming_symbols.interface.applicable_accessibilities = public, internal, private, protected, protected_internal, private_protected
+dotnet_naming_symbols.interface.required_modifiers = 
+
+dotnet_naming_symbols.types.applicable_kinds = class, struct, interface, enum
+dotnet_naming_symbols.types.applicable_accessibilities = public, internal, private, protected, protected_internal, private_protected
+dotnet_naming_symbols.types.required_modifiers = 
+
+dotnet_naming_symbols.non_field_members.applicable_kinds = property, event, method
+dotnet_naming_symbols.non_field_members.applicable_accessibilities = public, internal, private, protected, protected_internal, private_protected
+dotnet_naming_symbols.non_field_members.required_modifiers = 
+
+# Naming styles
+
+dotnet_naming_style.pascal_case.required_prefix = 
+dotnet_naming_style.pascal_case.required_suffix = 
+dotnet_naming_style.pascal_case.word_separator = 
+dotnet_naming_style.pascal_case.capitalization = pascal_case
+
+dotnet_naming_style.begins_with_i.required_prefix = I
+dotnet_naming_style.begins_with_i.required_suffix = 
+dotnet_naming_style.begins_with_i.word_separator = 
+dotnet_naming_style.begins_with_i.capitalization = pascal_case

Connected.Host.sln

@@ -0,0 +1,25 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.3.32901.215
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Connected.Host", "src\Connected.Host\Connected.Host.csproj", "{A2A01D43-0CEE-4E49-8EC1-F16CA92F3C30}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{A2A01D43-0CEE-4E49-8EC1-F16CA92F3C30}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{A2A01D43-0CEE-4E49-8EC1-F16CA92F3C30}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{A2A01D43-0CEE-4E49-8EC1-F16CA92F3C30}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{A2A01D43-0CEE-4E49-8EC1-F16CA92F3C30}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {8E8D9F6F-68E1-466C-8D83-5ECB3AA3FC76}
+	EndGlobalSection
+EndGlobal

src/Connected.Host/Configuration/MicroServiceDescriptor.cs

@@ -0,0 +1,8 @@
+namespace Connected.Host.Configuration
+{
+	internal class MicroServiceDescriptor
+	{
+		public string Name { get; set; }
+		public string Version { get; set; }
+	}
+}

src/Connected.Host/Configuration/SysConfiguration.cs

@@ -0,0 +1,14 @@
+namespace Connected.Host.Configuration;
+
+internal class SysConfiguration
+{
+	private const string DefaultStart = "Connected.Instance.Start, Connected.Instance";
+
+	private string _start = DefaultStart;
+
+	public List<MicroServiceDescriptor> MicroServices { get; set; } = new();
+
+	public List<string> Repositories { get; set; } = new();
+
+	public string Start { get => _start ?? DefaultStart; set => _start = value; }
+}

src/Connected.Host/Connected.Host.csproj

@@ -0,0 +1,18 @@
+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.DependencyModel" Version="7.0.0" />
+    <PackageReference Include="NuGet.PackageManagement" Version="6.4.0" />
+    <PackageReference Include="NuGet.Protocol" Version="6.4.0" />
+    <PackageReference Include="Swashbuckle.AspNetCore" Version="6.2.3" />
+    <PackageReference Include="Microsoft.Data.SqlClient" Version="5.0.0" />
+    <PackageReference Include="Microsoft.SqlServer.Management.SqlParser" Version="160.22515.0" />
+  </ItemGroup>
+
+</Project>

src/Connected.Host/ConnectedPlatformService.cs

@@ -0,0 +1,32 @@
+using System.Reflection;
+using Connected.Host.Configuration;
+using Microsoft.Extensions.Options;
+
+namespace Connected.Host;
+
+internal sealed class ConnectedPlatformService : BackgroundService
+{
+	private SysConfiguration Config { get; }
+	private IConfiguration GlobalConfig { get; }
+	public ConnectedPlatformService(IOptions<SysConfiguration> config, IConfiguration globalConfig)
+	{
+		Config = config.Value;
+		GlobalConfig = globalConfig;
+	}
+
+	protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+	{
+		await DependencyLoader.LoadPackages(Config.MicroServices, Config.Repositories);
+
+		if (Type.GetType(Config.Start) is not Type startupType)
+			throw new Exception($"Cannot resolve startup type. ({Config.Start}).");
+
+		if (startupType.GetMethod("ConfigureAsync", BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic) is not MethodInfo configureMethod)
+			throw new Exception($"ConfigureAsync does not exists in the startup type {startupType}. Startup must have static 'async Task ConfigureAsync(params string[] args)' method.");
+
+		if (configureMethod.Invoke(null, new object[] { GlobalConfig }) is not Task task)
+			throw new Exception($"ConfigureAsync of type {startupType} must return Task.");
+
+		await task;
+	}
+}

src/Connected.Host/DependencyLoader.cs

@@ -0,0 +1,343 @@
+using System.Reflection;
+using System.Runtime.Versioning;
+using Connected.Host.Configuration;
+using Microsoft.Extensions.DependencyModel;
+using NuGet.Configuration;
+using NuGet.Frameworks;
+using NuGet.Packaging;
+using NuGet.Packaging.Core;
+using NuGet.Packaging.Signing;
+using NuGet.Protocol.Core.Types;
+using NuGet.Resolver;
+using NuGet.Versioning;
+
+
+namespace Connected.Host;
+
+public class DependencyLoader
+{
+	/// <summary>
+	/// Loads packages from the specified repositories into memory.
+	/// </summary>
+	/// <param name="packages">A list of package Id and version descriptors to load.</param>
+	/// <param name="repositoryLocations">A list of NuGet repositories to check.</param>
+	/// <param name="cancellationToken"></param>
+	/// <exception cref="InvalidOperationException">Thrown when a package identity could not be resolved.</exception>
+	private async Task Load(IEnumerable<MicroServiceDescriptor> packages, IEnumerable<string> repositoryLocations, CancellationToken? cancellationToken = null)
+	{
+		cancellationToken ??= CancellationToken.None;
+
+		//TODO: Wire up actual logger
+		var logger = new NuGet.Common.NullLogger();
+
+		/*
+		 * Define a source provider with specified sources.
+		 */
+		var packageSources = GetPackageSources(repositoryLocations);
+		/*
+		 * Define a package source provider with empty settings with the specified package sources.
+		 */
+		var packageSourceProvider = new PackageSourceProvider(Settings.LoadMachineWideSettings(Settings.DefaultSettingsFileName), packageSources);
+		/*
+		 * Define a repository provider with our package source and the latest API capabilities.
+		 */
+		var repositoryProvider = new SourceRepositoryProvider(packageSourceProvider, Repository.Provider.GetCoreV3());
+		/*
+		 * Setup contexts for dependency resolution and package downloading.
+		 * First, the disposable cache
+		 */
+		using var sourceCacheContext = new SourceCacheContext();
+		/*
+		 * Next, the compatible framework versions.
+		 */
+		var version = Assembly.GetExecutingAssembly()
+						.GetCustomAttributes(typeof(TargetFrameworkAttribute), false)
+						.SingleOrDefault() as TargetFrameworkAttribute;
+
+		var targetFramework = NuGetFramework.ParseFrameworkName(version.FrameworkName, DefaultFrameworkNameProvider.Instance);
+		/*
+		 * Complete list of all touched packages, to be filled out by installer and downloader.
+		 */
+		var allPackages = new HashSet<SourcePackageDependencyInfo>();
+		/*
+		 * Default dependency context.
+		 */
+		var dependencyContext = DependencyContext.Default;
+		/*
+		 * Extract list of repositories.
+		 */
+		var repositories = repositoryProvider.GetRepositories();
+		/*
+		 * Get all package identities and packages.
+		 */
+		foreach (var dependency in packages)
+		{
+			var packageIdentity = await GetPackageIdentity(dependency, sourceCacheContext, logger, repositories, cancellationToken.Value);
+
+			if (packageIdentity is null)
+				throw new InvalidOperationException($"Cannot find package {dependency.Name}.");
+
+			await GetPackageDependencies(packageIdentity, sourceCacheContext, targetFramework, logger, repositories, dependencyContext, allPackages, cancellationToken.Value);
+		}
+
+		var packagesToInstall = GetPackagesToInstall(repositoryProvider, logger, packages, allPackages);
+		/*
+		 * Install packages in standard location.
+		 */
+		var packageDirectory = Path.Combine(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location)!, ".packages");
+
+		var nugetSettings = Settings.LoadDefaultSettings(packageDirectory);
+
+		await InstallPackages(sourceCacheContext, logger, packagesToInstall, packageDirectory, nugetSettings, cancellationToken.Value);
+	}
+	/// <summary>
+	/// Installs the list of packages and loads them into memory.
+	/// </summary>
+	/// <param name="sourceCacheContext">The shared context for resolved packages.</param>
+	/// <param name="logger">A standard NuGet logger.</param>
+	/// <param name="packagesToInstall">A list of packages to install.</param>
+	/// <param name="rootPackagesDirectory">The root directory into which the packages are downloaded and extracted.</param>
+	/// <param name="nugetSettings">A set of NuGet settings, containing local repos and download behavior settings.</param>
+	/// <param name="cancellationToken"></param>
+	private async Task InstallPackages(SourceCacheContext sourceCacheContext, NuGet.Common.ILogger logger,
+									   IEnumerable<SourcePackageDependencyInfo> packagesToInstall, string rootPackagesDirectory,
+									   ISettings nugetSettings, CancellationToken cancellationToken)
+	{
+		var packagePathResolver = new PackagePathResolver(rootPackagesDirectory, true);
+		var packageExtractionContext = new PackageExtractionContext(
+			PackageSaveMode.Defaultv3,
+			XmlDocFileSaveMode.Skip,
+			ClientPolicyContext.GetClientPolicy(nugetSettings, logger),
+			logger);
+
+		foreach (var package in packagesToInstall)
+		{
+			var downloadResource = await package.Source.GetResourceAsync<DownloadResource>(cancellationToken);
+
+			/*
+			 * Download package (from online, local or shared cache).
+			 */
+			var downloadResult = await downloadResource.GetDownloadResourceResultAsync(
+				package,
+				new PackageDownloadContext(sourceCacheContext),
+				SettingsUtility.GetGlobalPackagesFolder(nugetSettings),
+				logger,
+				cancellationToken);
+
+			/*
+			 * Extract package.
+			 */
+			var extractedFiles = await PackageExtractor.ExtractPackageAsync(
+				downloadResult.PackageSource,
+				downloadResult.PackageStream,
+				packagePathResolver,
+				packageExtractionContext,
+				cancellationToken);
+
+			/*
+			 * Install applicable dlls.
+			 */
+			foreach (var assembly in extractedFiles.Where(e => e.EndsWith(".dll")))
+			{
+				try
+				{
+					Assembly.LoadFrom(assembly);
+				}
+				catch (Exception e)
+				{
+					logger.LogWarning($"Could not load assembly. {e}");
+				}
+			}
+		}
+	}
+
+	/// <summary>
+	/// Generates a list of package sources from a list of repository urls.
+	/// </summary>
+	/// <param name="sources">A list of URIs of specified sources.</param>
+	/// <returns>A list of package sources for the specified NuGet repository URIs.</returns>
+	private IEnumerable<PackageSource> GetPackageSources(IEnumerable<string> sources)
+	{
+		foreach (var source in sources)
+			yield return new PackageSource(source);
+	}
+
+	/// <summary>
+	/// Returns a list of missing packages to satisfy all dependencies.
+	/// </summary>
+	/// <param name="sourceRepositoryProvider">A source repository provider for all resources to load packages from.</param>
+	/// <param name="logger">A standard NuGet logger.</param>
+	/// <param name="packages">A list of packages for which to resolve all dependencies.</param>
+	/// <param name="availablePackages">A list of available packages to resolve from.</param>
+	/// <returns></returns>
+	private IEnumerable<SourcePackageDependencyInfo> GetPackagesToInstall(SourceRepositoryProvider sourceRepositoryProvider, NuGet.Common.ILogger logger, IEnumerable<MicroServiceDescriptor> packages, HashSet<SourcePackageDependencyInfo> availablePackages)
+	{
+		/*
+		 * Create resolver to resolve missing packages
+		 */
+		var resolverContext = new PackageResolverContext(
+			   DependencyBehavior.Lowest,
+			   packages.Select(x => x.Name),
+			   Enumerable.Empty<string>(),
+			   Enumerable.Empty<PackageReference>(),
+			   Enumerable.Empty<PackageIdentity>(),
+			   availablePackages,
+			   sourceRepositoryProvider.GetRepositories().Select(s => s.PackageSource),
+			   logger);
+
+		var packagesToInstall = new PackageResolver()
+			.Resolve(resolverContext, CancellationToken.None)
+			.Select(p => availablePackages.Single(x => PackageIdentityComparer.Default.Equals(x, p)));
+
+		return packagesToInstall;
+	}
+	/// <summary>
+	/// Resolves a package identity from the supplied Id and version.
+	/// </summary>
+	/// <param name="microserviceDescriptor">The version and id of the required package.</param>
+	/// <param name="cache">The shared cache in which resolved packages are stored.</param>
+	/// <param name="nugetLogger">A standard NuGet logger.</param>
+	/// <param name="repositories">A list of repositories to check when resolving the package version.</param>
+	/// <param name="cancelToken"></param>
+	/// <returns>Returns the resolved package identity or null if it could not be resolved.</returns>
+	/// <exception cref="InvalidOperationException">Thrown when the version range could not be parsed.</exception>
+	private async Task<PackageIdentity?> GetPackageIdentity(MicroServiceDescriptor microserviceDescriptor, SourceCacheContext cache, NuGet.Common.ILogger nugetLogger, IEnumerable<SourceRepository> repositories, CancellationToken cancelToken)
+	{
+		/*
+		 * Go through repositories in order. 
+		 */
+		foreach (var sourceRepository in repositories)
+		{
+			/*
+			 * Get resource, available versions and attempt to resolve the appropriate version. If none is available, take the last one.
+			 */
+			var findPackageResource = await sourceRepository.GetResourceAsync<FindPackageByIdResource>();
+
+			var availableVersions = await findPackageResource.GetAllVersionsAsync(microserviceDescriptor.Name, cache, nugetLogger, cancelToken);
+
+			NuGetVersion selected;
+
+			if (microserviceDescriptor.Version is not null)
+			{
+				if (!VersionRange.TryParse(microserviceDescriptor.Version, out var range))
+					throw new InvalidOperationException("Invalid version range provided.");
+
+				var bestVersion = range.FindBestMatch(availableVersions);
+
+				selected = bestVersion;
+			}
+			else
+				selected = availableVersions.LastOrDefault();
+
+			if (selected is not null)
+				return new PackageIdentity(microserviceDescriptor.Name, selected);
+		}
+
+		return null;
+	}
+	/// <summary>
+	/// Searches the package dependency graph for the chain of all packages to install.
+	/// </summary>
+	private async Task GetPackageDependencies(PackageIdentity package,
+											  SourceCacheContext cacheContext,
+											  NuGetFramework framework,
+											  NuGet.Common.ILogger logger,
+											  IEnumerable<SourceRepository> repositories,
+											  DependencyContext hostDependencies,
+											  ISet<SourcePackageDependencyInfo> availablePackages,
+											  CancellationToken cancelToken)
+	{
+		/*
+		 * Already present, skip.
+		 */
+		if (availablePackages.Contains(package))
+			return;
+
+		foreach (var sourceRepository in repositories)
+		{
+			/*
+			 * Get dependency info.
+			 */
+			var dependencyInfoResource = await sourceRepository.GetResourceAsync<DependencyInfoResource>();
+
+			var dependencyInfo = await dependencyInfoResource.ResolvePackage(
+				package,
+				framework,
+				cacheContext,
+				logger,
+				cancelToken);
+
+			if (dependencyInfo is null)
+				continue;
+			/*
+			 * Only return packages not provided by the host.
+			 */
+			var sourceDependencies = new SourcePackageDependencyInfo(
+				dependencyInfo.Id,
+				dependencyInfo.Version,
+				dependencyInfo.Dependencies.Where(dependency => !DependencySuppliedByHost(hostDependencies, dependency)),
+				dependencyInfo.Listed,
+				dependencyInfo.Source);
+
+			availablePackages.Add(sourceDependencies);
+			/*
+			 * Get the dependency's packages.
+			 */
+			foreach (var dependency in sourceDependencies.Dependencies)
+			{
+				await GetPackageDependencies(
+					new PackageIdentity(dependency.Id, dependency.VersionRange.MinVersion),
+					cacheContext,
+					framework,
+					logger,
+					repositories,
+					hostDependencies,
+					availablePackages,
+					cancelToken);
+			}
+
+			break;
+		}
+	}
+	/// <summary>
+	/// Checks if a package dependency is already provided by the host.
+	/// </summary>
+	/// <param name="hostDependencies">The context packages.</param>
+	/// <param name="dependency">The dependency to check for.</param>
+	/// <returns>True if the host provides the dependency, false otherwise.</returns>
+	private bool DependencySuppliedByHost(DependencyContext hostDependencies, PackageDependency dependency)
+	{
+		/*
+		 * Check runtimes for package with same id.
+		 */
+		var runtimeLib = hostDependencies.RuntimeLibraries.FirstOrDefault(r => r.Name == dependency.Id);
+
+		if (runtimeLib is null)
+			return false;
+		/*
+		 * Check for version compatibility.
+		 */
+		var parsedLibVersion = NuGetVersion.Parse(runtimeLib.Version);
+
+		if (parsedLibVersion.IsPrerelease)
+			/*
+			 * Latest and greatest. Always accept due to system compatiblity reasons.
+			 */
+			return true;
+
+		/*
+		 * Check for version compatibility.
+		 */
+		return dependency.VersionRange.Satisfies(parsedLibVersion);
+
+	}
+	/// <summary>
+	/// Loads packages from the specified repositories into memory.
+	/// </summary>
+	/// <param name="packages">A list of package Id and version descriptors to load.</param>
+	/// <param name="repositories">A list of NuGet repositories to check.</param>
+	internal static async Task LoadPackages(IEnumerable<MicroServiceDescriptor> packages, IEnumerable<string> repositories)
+	{
+		await new DependencyLoader().Load(packages, repositories);
+	}
+}

src/Connected.Host/Program.cs

@@ -0,0 +1,42 @@
+using Connected.Host.Configuration;
+
+namespace Connected.Host
+{
+	public static partial class Program
+	{
+		public static async Task Main(params string[] args)
+		{
+			using IHost host = Microsoft.Extensions.Hosting.Host
+				.CreateDefaultBuilder(args)
+				.ConfigureAppConfiguration((_, cfg) =>
+				{
+					var appPath = AppContext.BaseDirectory;
+					var segments = new Uri(appPath).Segments;
+
+					segments = segments.Select(e => e.Replace("%20", " ")).ToArray();
+
+					for (var i = 1; i <= segments.Length; i++)
+					{
+						var pathBase = Path.Combine(segments[0..i]);
+						var filePath = Path.Combine(pathBase, "sys.json");
+
+						if (File.Exists(filePath))
+						{
+							cfg.AddJsonFile(filePath, true, false);
+							break;
+						}
+					}
+
+					cfg.AddEnvironmentVariables();
+				})
+				.ConfigureServices((context, services) =>
+				{
+					services.Configure<SysConfiguration>(context.Configuration);
+					services.AddHostedService<ConnectedPlatformService>();
+				})
+				.Build();
+
+			await host.RunAsync();
+		}
+	}
+}

src/Connected.Host/Properties/launchSettings.json

@@ -0,0 +1,39 @@
+{
+  "profiles": {
+    "TomPIT.Connected": {
+      "commandName": "Project",
+      "launchBrowser": true,
+      "launchUrl": "swagger",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      },
+      "dotnetRunMessages": true,
+      "applicationUrl": "http://localhost:5063"
+    },
+    "IIS Express": {
+      "commandName": "IISExpress",
+      "launchBrowser": true,
+      "launchUrl": "swagger",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "Synchronize Entities": {
+      "commandName": "Project",
+      "commandLineArgs": "entitySynchronization=rebuild"
+    },
+    "Synchronize Entity": {
+      "commandName": "Project",
+      "commandLineArgs": "entitySynchronization=type:Logistics.Documents/Logistics.Documents.Receive.ReceivePlannedItem"
+    }
+  },
+  "$schema": "https://json.schemastore.org/launchsettings.json",
+  "iisSettings": {
+    "windowsAuthentication": false,
+    "anonymousAuthentication": true,
+    "iisExpress": {
+      "applicationUrl": "http://localhost:14733",
+      "sslPort": 44321
+    }
+  }
+}

src/Connected.Host/appsettings.Development.json

@@ -0,0 +1,8 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  }
+}

src/Connected.Host/appsettings.json

@@ -0,0 +1,9 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  },
+  "AllowedHosts": "*"
+}

src/Connected.Host/sys.json

@@ -0,0 +1,29 @@
+{
+  "repositories": [
+    "c:/nuget/packages",
+    "https://api.nuget.org/v3/index.json"
+  ],
+  "microServices": [
+    {
+      "name": "Connected.Common.Types",
+      "version": "1.0.*-*"
+    },
+    {
+      "name": "Connected.Common.Notes",
+      "version": "1.0.*-*"
+    },
+    {
+      "name": "Connected.ServiceModel.Client.Data",
+      "version": "1.0.*-*"
+    },
+    {
+      "name": "Connected.ServiceModel.Client",
+      "version": "1.0.*-*"
+    },
+    {
+      "name": "Connected.Instance",
+      "version": "1.0.*-*"
+    }
+  ],
+  "start": "Connected.Instance.Start, Connected.Instance"
+}