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using Npgsql;
using NpgsqlRest.Defaults;
using System.Collections.Frozen;
using NpgsqlRest.HttpClientType;
using NpgsqlRest.UploadHandlers;
namespace NpgsqlRest;
using Metadata = (
List<NpgsqlRestMetadataEntry> entries,
FrozenDictionary<string, NpgsqlRestMetadataEntry> overloads,
bool hasStreamingEvents);
public class NpgsqlRestMetadataEntry
{
internal NpgsqlRestMetadataEntry(RoutineEndpoint endpoint, IRoutineSourceParameterFormatter formatter, string key)
{
Endpoint = endpoint;
Formatter = formatter;
Key = key;
}
public RoutineEndpoint Endpoint { get; }
public IRoutineSourceParameterFormatter Formatter { get; }
public string Key { get; }
}
public static class NpgsqlRestBuilder
{
public static IApplicationBuilder UseNpgsqlRest(this WebApplication builder, NpgsqlRestOptions options)
{
if (options.ConnectionString is null && options.DataSource is null && options.ServiceProviderMode == ServiceProviderObject.None)
{
throw new ArgumentException("ConnectionString and DataSource are null and ServiceProviderMode is set to None. You must specify connection with connection string, DataSource object or with ServiceProvider");
}
if (options.ConnectionString is not null && options.DataSource is not null && options.ServiceProviderMode == ServiceProviderObject.None)
{
throw new ArgumentException("Both ConnectionString and DataSource are provided. Please specify only one.");
}
Options = options;
var factory = builder.Services.GetRequiredService<ILoggerFactory>();
Logger = factory.CreateLogger(options.LoggerName ?? typeof(NpgsqlRestBuilder).Namespace ?? "NpgsqlRest");
RetryStrategy? defaultStrategy = null;
if (Options.CommandRetryOptions.Enabled is true && string.IsNullOrEmpty(Options.CommandRetryOptions.DefaultStrategy) is false)
{
if (Options.CommandRetryOptions.Strategies
.TryGetValue(Options.CommandRetryOptions.DefaultStrategy, out defaultStrategy) is false)
{
Logger?.LogWarning("Default retry strategy {defaultStrategy} not found in the list of strategies, command retry strategy will be ignored.",
Options.CommandRetryOptions.DefaultStrategy);
}
}
var (
entries,
overloads,
hasStreamingEvents
) = Build(builder, defaultStrategy);
if (entries.Count == 0)
{
return builder;
}
if (Options.HttpClientOptions.Enabled is true)
{
new HttpClientTypes(builder, defaultStrategy);
}
if (hasStreamingEvents is true)
{
builder.UseMiddleware<NpgsqlRestSseEventSource>();
}
foreach (var entry in entries)
{
var handler = new NpgsqlRestEndpoint(entry, overloads);
var endpoint = entry.Endpoint;
var methodStr = endpoint.Method.ToString();
var urlInfo = string.Concat(methodStr, " ", endpoint.Path);
var routeBuilder = builder.MapMethods(endpoint.Path, [methodStr], handler.InvokeAsync);
if (options.CommandTimeout is not null && endpoint.CommandTimeout is null)
{
endpoint.CommandTimeout = options.CommandTimeout;
}
if (endpoint.RateLimiterPolicy is not null || options.DefaultRateLimitingPolicy is not null)
{
var policy = endpoint.RateLimiterPolicy ?? options.DefaultRateLimitingPolicy!;
routeBuilder.RequireRateLimiting(policy);
Logger?.EndpointEnabledRateLimiterPolicy(urlInfo, policy);
}
if (options.RouteHandlerCreated is not null)
{
options.RouteHandlerCreated(routeBuilder, endpoint);
}
Logger?.EndpointCreated(urlInfo);
if (endpoint.SseEventsPath is not null)
{
if (endpoint.SseEventNoticeLevel is null)
{
endpoint.SseEventNoticeLevel = Options.DefaultSseEventNoticeLevel;
}
Logger?.EndpointSsePath($"{endpoint.Method} {endpoint.Path}", endpoint.SseEventsPath, endpoint.SseEventNoticeLevel);
}
}
return builder;
}
private const int MaxPathLength = 2048;
private static Metadata Build(IApplicationBuilder? builder, RetryStrategy? defaultStrategy)
{
// Pre-size dictionaries with reasonable capacity to reduce allocations
Dictionary<string, NpgsqlRestMetadataEntry> lookup = new(capacity: 128);
Dictionary<string, NpgsqlRestMetadataEntry> overloads = new(capacity: 16);
// Create default upload handlers from upload handler options
Options.UploadOptions.UploadHandlers ??= Options.UploadOptions.CreateUploadHandlers();
var hasLogin = false;
if (builder is not null)
{
foreach (var handler in Options.EndpointCreateHandlers)
{
handler.Setup(builder, Options);
}
}
Options.SourcesCreated(Options.RoutineSources);
var hasCachedRoutine = false;
CommentsMode optionsCommentsMode = Options.CommentsMode;
bool hasStreamingEvents = false;
foreach (var source in Options.RoutineSources)
{
if (source.CommentsMode.HasValue)
{
Options.CommentsMode = source.CommentsMode.Value;
}
else
{
Options.CommentsMode = optionsCommentsMode;
}
foreach (var (routine, formatter) in source.Read(builder?.ApplicationServices, defaultStrategy))
{
RoutineEndpoint? endpoint = DefaultEndpoint.Create(routine);
if (endpoint is null)
{
continue;
}
if (Options.EndpointCreated is not null)
{
Options.EndpointCreated(endpoint);
if (endpoint is null)
{
continue;
}
}
if (defaultStrategy is not null && endpoint.RetryStrategy is null)
{
endpoint.RetryStrategy = defaultStrategy;
}
if (endpoint.Path.Length == 0)
{
throw new ArgumentException($"URL path for URL {endpoint.Path}, routine {routine.Name} is empty.");
}
if (endpoint.Path.Length > MaxPathLength)
{
throw new ArgumentException($"URL path for URL {endpoint.Path}, routine {routine.Name} length exceeds {MaxPathLength} characters.");
}
// Cache method string to avoid repeated ToString() calls
var method = endpoint.Method.ToString();
if (endpoint.HasBodyParameter is true && endpoint.RequestParamType == RequestParamType.BodyJson)
{
endpoint.RequestParamType = RequestParamType.QueryString;
Logger?.EndpointTypeChangedBodyParam(method, endpoint.Path, endpoint.BodyParameterName ?? "");
}
if (endpoint.Upload is true)
{
if (endpoint.Method != Method.POST)
{
Logger?.EndpointMethodChangedUpload(method, endpoint.Path, Method.POST.ToString());
endpoint.Method = Method.POST;
method = "POST"; // Update cached string
}
if (endpoint.RequestParamType == RequestParamType.BodyJson)
{
endpoint.RequestParamType = RequestParamType.QueryString;
Logger?.EndpointTypeChangedUpload(method, endpoint.Path);
}
}
var key = string.Concat(method, endpoint.Path);
var value = new NpgsqlRestMetadataEntry(endpoint, formatter, key);
if (lookup.TryGetValue(key, out var existing))
{
overloads[string.Concat(key, existing.Endpoint.Routine.ParamCount)] = existing;
}
lookup[key] = value;
// Create cache invalidation endpoint if configured and this endpoint is cached
if (endpoint.Cached is true && Options.CacheOptions.InvalidateCacheSuffix is not null)
{
var invalidatePath = endpoint.Path.EndsWith('/')
? string.Concat(endpoint.Path, Options.CacheOptions.InvalidateCacheSuffix)
: string.Concat(endpoint.Path, "/", Options.CacheOptions.InvalidateCacheSuffix);
var invalidateEndpoint = new RoutineEndpoint(
routine: routine,
path: invalidatePath,
method: endpoint.Method,
requestParamType: endpoint.RequestParamType,
requiresAuthorization: endpoint.RequiresAuthorization,
responseContentType: "application/json",
responseHeaders: endpoint.ResponseHeaders,
requestHeadersMode: endpoint.RequestHeadersMode,
requestHeadersParameterName: endpoint.RequestHeadersParameterName,
bodyParameterName: endpoint.BodyParameterName,
textResponseNullHandling: endpoint.TextResponseNullHandling,
queryStringNullHandling: endpoint.QueryStringNullHandling,
authorizeRoles: endpoint.AuthorizeRoles,
cached: true,
cachedParams: endpoint.CachedParams?.ToArray(),
connectionName: endpoint.ConnectionName
)
{
InvalidateCache = true,
BasicAuth = endpoint.BasicAuth,
RateLimiterPolicy = endpoint.RateLimiterPolicy
};
var invalidateKey = string.Concat(method, invalidatePath);
var invalidateValue = new NpgsqlRestMetadataEntry(invalidateEndpoint, formatter, invalidateKey);
lookup[invalidateKey] = invalidateValue;
// Notify endpoint create handlers about the invalidation endpoint
if (builder is not null)
{
foreach (var handler in Options.EndpointCreateHandlers)
{
handler.Handle(invalidateEndpoint);
}
}
}
if (routine.ColumnsTypeDescriptor is not null && routine.ColumnsTypeDescriptor.Length == 1)
{
bool[] unknownResultTypeList = new bool[routine.ColumnsTypeDescriptor.Length];
bool hasKnownType = false;
for (var i = 0; i < routine.ColumnsTypeDescriptor.Length; i++)
{
unknownResultTypeList[i] = routine.ColumnsTypeDescriptor[i].ShouldRenderAsUnknownType;
if (routine.ColumnsTypeDescriptor[i].ShouldRenderAsUnknownType is false)
{
hasKnownType = true;
}
}
if (hasKnownType)
{
routine.UnknownResultTypeList = unknownResultTypeList;
}
}
if (builder is not null)
{
foreach (var handler in Options.EndpointCreateHandlers)
{
handler.Handle(endpoint);
}
}
if (endpoint.SseEventsPath is not null)
{
if (endpoint.SseEventsPath.StartsWith(endpoint.Path) is false)
{
// Optimize path concatenation
var basePath = endpoint.Path.EndsWith('/') ? endpoint.Path[..^1] : endpoint.Path;
var streamPath = endpoint.SseEventsPath.StartsWith('/')
? endpoint.SseEventsPath[1..]
: endpoint.SseEventsPath;
endpoint.SseEventsPath = string.Concat(basePath, "/", streamPath);
}
NpgsqlRestSseEventSource.Paths.Add(endpoint.SseEventsPath);
hasStreamingEvents = true;
}
if (endpoint.Login is true)
{
hasLogin = true;
if (routine.IsVoid is true || routine.ReturnsUnnamedSet is true)
{
throw new ArgumentException($"{routine.Type.ToString().ToLowerInvariant()} {routine.Schema}.{routine.Name} is marked as login and it can't be void or returning unnamed data sets.");
}
}
if (endpoint.Cached is true && hasCachedRoutine is false)
{
hasCachedRoutine = true;
}
}
}
if (hasLogin is true)
{
if (Options.AuthenticationOptions.DefaultAuthenticationType is null)
{
string db = new NpgsqlConnectionStringBuilder(Options.ConnectionString).Database ?? "NpgsqlRest";
Options.AuthenticationOptions.DefaultAuthenticationType = db;
Logger?.SetDefaultAuthenticationType(db);
}
}
if (hasCachedRoutine is true && Options.CacheOptions.DefaultRoutineCache is RoutineCache)
{
RoutineCache.Start(Options);
if (builder is WebApplication app)
{
app.Lifetime.ApplicationStopping.Register(() =>
{
RoutineCache.Shutdown();
});
}
}
if (Options.UploadOptions.UploadHandlers is not null && Options.UploadOptions.UploadHandlers.ContainsKey(Options.UploadOptions.DefaultUploadHandler) is false)
{
Logger?.LogError("Default upload handler {defaultUploadHandler} not found in the list of upload handlers. Using upload endpoint with default handler may cause an error.",
Options.UploadOptions.DefaultUploadHandler);
}
// Avoid multiple enumerations by creating the list once
var entries = new List<NpgsqlRestMetadataEntry>(lookup.Values);
// Create array once if needed by callbacks or handlers
RoutineEndpoint[]? endpointsArray = null;
bool arrayPopulated = false;
if (Options.EndpointsCreated is not null)
{
endpointsArray = new RoutineEndpoint[entries.Count];
for (int i = 0; i < entries.Count; i++)
{
endpointsArray[i] = entries[i].Endpoint;
}
arrayPopulated = true;
Options.EndpointsCreated(endpointsArray);
}
if (builder is not null)
{
foreach (var handler in Options.EndpointCreateHandlers)
{
if (endpointsArray is null)
{
endpointsArray = new RoutineEndpoint[entries.Count];
}
if (!arrayPopulated)
{
for (int i = 0; i < entries.Count; i++)
{
endpointsArray[i] = entries[i].Endpoint;
}
arrayPopulated = true;
}
handler.Cleanup(endpointsArray);
handler.Cleanup();
}
}
return (entries, overloads.ToFrozenDictionary(), hasStreamingEvents);
}
}
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