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using Npgsql;
using NpgsqlRest.Defaults;
using System.Collections.Frozen;
using System.Text;
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;
ParameterParsers.JsonTimestampsAreUtc = options.JsonTimestampsAreUtc;
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);
}
}
if (Options.HttpClientOptions.Enabled is true)
{
new HttpClientTypes(builder, defaultStrategy);
if (Options.HttpClientOptions.CacheEnabled)
{
HttpClientType.HttpResponseCache.Start(Options);
if (builder is WebApplication httpCacheApp)
{
httpCacheApp.Lifetime.ApplicationStopping.Register(HttpClientType.HttpResponseCache.Shutdown);
}
}
}
var (
entries,
overloads,
hasStreamingEvents
) = Build(builder, defaultStrategy);
if (entries.Count == 0)
{
return builder;
}
// Initialize internal request handler for self-referencing calls (bypass HTTP).
// Store root service provider for creating scoped contexts.
// The RequestDelegate is set lazily on the first self-call request.
InternalRequestHandler.Initialize(((IApplicationBuilder)builder).ApplicationServices);
if (hasStreamingEvents is true)
{
builder.UseMiddleware<NpgsqlRestSseEventSource>();
var lifetime = ((IApplicationBuilder)builder).ApplicationServices.GetService<IHostApplicationLifetime>();
lifetime?.ApplicationStopping.Register(() =>
{
NpgsqlRestSseEventSource.Broadcaster.CompleteAll();
});
}
var internalHandlers = new Dictionary<string, Func<HttpContext, Task>>(entries.Count, StringComparer.OrdinalIgnoreCase);
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);
// Register for internal self-calls by method + path (capture handler for direct invocation)
// Internal-only endpoints are still callable via InternalRequestHandler.
internalHandlers[$"{methodStr} {endpoint.Path}"] = ctx =>
handler.InvokeAsync(ctx, ctx.RequestServices, ctx.RequestAborted);
if (options.CommandTimeout is not null && endpoint.CommandTimeout is null)
{
endpoint.CommandTimeout = options.CommandTimeout;
}
// Internal-only endpoints skip HTTP route registration — they are only
// accessible via self-referencing calls (proxy, HTTP client types).
if (endpoint.InternalOnly)
{
if (Options.DebugLogEndpointCreateEvents)
{
Logger?.LogInformation("Internal-only endpoint {UrlInfo} (no HTTP route)", urlInfo);
}
continue;
}
var routeBuilder = builder.MapMethods(endpoint.Path, [methodStr], handler.InvokeAsync);
if (endpoint.RateLimiterPolicy is not null || options.DefaultRateLimitingPolicy is not null)
{
var policy = endpoint.RateLimiterPolicy ?? options.DefaultRateLimitingPolicy!;
routeBuilder.RequireRateLimiting(policy);
Logger?.EndpointEnabledRateLimiterPolicy(urlInfo, policy);
}
if (options.RouteHandlerCreated is not null)
{
options.RouteHandlerCreated(routeBuilder, endpoint);
}
if (Options.DebugLogEndpointCreateEvents)
{
Logger?.EndpointCreated(urlInfo);
}
// Resolve the notice-level default for any endpoint that participates in SSE — both
// subscribers (need it for filtering) and publishers (need it for the broadcast gate).
// After B.1 these can be independent: an @sse_publish-only endpoint has no SseEventsPath
// but still needs a configured level; an @sse_subscribe-only endpoint has a path but
// doesn't publish.
if (endpoint.SseEventsPath is not null || endpoint.SsePublishEnabled)
{
if (endpoint.SseEventNoticeLevel is null)
{
endpoint.SseEventNoticeLevel = Options.DefaultSseEventNoticeLevel;
}
if (endpoint.SseEventsPath is not null)
{
Logger?.EndpointSsePath($"{endpoint.Method} {endpoint.Path}", endpoint.SseEventsPath, endpoint.SseEventNoticeLevel);
}
}
}
// Register internal handlers for self-referencing calls (bypass HTTP)
InternalRequestHandler.SetEndpointHandlers(internalHandlers);
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.EndpointSourcesCreated(Options.EndpointSources);
var hasCachedRoutine = false;
CommentsMode optionsCommentsMode = Options.CommentsMode;
bool hasStreamingEvents = false;
foreach (var source in Options.EndpointSources)
{
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;
}
}
// Apply source's NestedJsonForCompositeTypes default if not set by comment annotation
if (endpoint.NestedJsonForCompositeTypes is null && source.NestedJsonForCompositeTypes)
{
endpoint.NestedJsonForCompositeTypes = true;
}
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,
CacheProfile = endpoint.CacheProfile
};
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);
}
}
// Fail-fast if a claim-mapped parameter is declared with a known non-text type.
// Claim values are strings, so binding to e.g. an Integer parameter would crash
// every authenticated request with a misleading InvalidCastException deep inside
// Npgsql ("Writing values of 'System.String' is not supported for parameters
// having NpgsqlDbType '<X>'"). NpgsqlDbType.Unknown is allowed — Npgsql resolves
// it server-side, which is the SqlFileSource path where param types aren't
// inferred. There is no scenario where the known-non-text configuration is valid,
// so surface it as a hard error at startup rather than letting it ship to prod.
if (endpoint.UseUserParameters is true && Options.AuthenticationOptions.ParameterNameClaimsMapping.Count > 0)
{
for (int p = 0; p < routine.Parameters.Length; p++)
{
var param = routine.Parameters[p];
if (param.UserClaim is not null
&& param.TypeDescriptor.IsText is false
&& param.TypeDescriptor.BaseDbType != NpgsqlTypes.NpgsqlDbType.Unknown)
{
throw new ArgumentException(
$"Endpoint {method} {endpoint.Path} parameter {param.ActualName} is mapped to claim '{param.UserClaim}' but its type is '{param.TypeDescriptor.OriginalType}' which is not text-compatible. Claim values are strings, so binding would fail at runtime with InvalidCastException. Declare the parameter as text/varchar/char/json/jsonb/xml/jsonpath, or remove '{param.ActualName}' from ParameterNameClaimsMapping.");
}
}
}
// Warn if @table_format is set on non-applicable endpoints
if (Options.TableFormatHandlers is not null
&& endpoint.CustomParameters is not null
&& endpoint.CustomParameters.TryGetValue("table_format", out var tableFormatValue))
{
if (!Options.TableFormatHandlers.ContainsKey(tableFormatValue)
&& !(tableFormatValue.Contains('{') && tableFormatValue.Contains('}')))
{
Logger?.LogWarning("Endpoint {path} has @table_format = {format} but no table format handler with that name is registered. The annotation will be ignored.",
endpoint.Path, tableFormatValue);
}
else if (routine.IsVoid)
{
Logger?.LogWarning("Endpoint {path} has @table_format but routine returns void. Table format rendering only applies to set/record results. The annotation will be ignored.",
endpoint.Path);
}
else if (routine.ReturnsSet == false && routine.ColumnCount == 1 && routine.ReturnsRecordType is false)
{
Logger?.LogWarning("Endpoint {path} has @table_format but routine returns a single scalar value. Table format rendering only applies to set/record results. The annotation will be ignored.",
endpoint.Path);
}
}
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);
NpgsqlRestSseEventSource.HasAnySseEndpoints = true;
hasStreamingEvents = true;
}
// Track whether anything in this build publishes to the broadcaster — both feeds the
// SSE middleware and (combined with subscribe registrations above) gates the
// unbound-RAISE warning so projects that don't use SSE see zero noise.
if (endpoint.SsePublishEnabled)
{
NpgsqlRestSseEventSource.HasAnySseEndpoints = true;
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);
}
}
// Cache profile resolution pass: bind each endpoint's @cache_profile name to the profile's IRoutineCache instance,
// inherit profile defaults (Expiration, Parameters, When rules) into the endpoint, and verify every referenced
// profile name actually exists. Unresolved names are accumulated into a single error so users see all typos
// at once rather than discovering them one rebuild at a time.
if (Options.CacheOptions.Profiles is not null && Options.CacheOptions.Profiles.Count > 0)
{
var usedProfiles = new HashSet<string>(StringComparer.Ordinal);
var unresolved = new Dictionary<string, List<string>>(StringComparer.Ordinal);
foreach (var entry in lookup.Values)
{
var endpoint = entry.Endpoint;
if (endpoint.CacheProfile is null)
{
continue;
}
if (Options.CacheOptions.Profiles.TryGetValue(endpoint.CacheProfile, out var profile))
{
usedProfiles.Add(endpoint.CacheProfile);
endpoint.ResolvedCache = profile.Cache;
endpoint.CacheKeyPrefix = endpoint.CacheProfile;
// Annotation wins: endpoint's explicit @cache_expires overrides profile.Expiration.
if (endpoint.CacheExpiresIn is null && profile.Expiration is not null)
{
endpoint.CacheExpiresIn = profile.Expiration;
}
// Annotation wins: endpoint's @cached p1, p2 (CachedParams non-null) overrides profile.Parameters.
// null Parameters → all routine params; [] → URL-only cache; named list → those params only.
if (endpoint.CachedParams is null)
{
if (profile.Parameters is null)
{
// Profile says "use all params" — populate with every routine parameter name.
var all = new HashSet<string>(StringComparer.Ordinal);
foreach (var p in endpoint.Routine.Parameters)
{
all.Add(p.ActualName);
if (!string.Equals(p.ConvertedName, p.ActualName, StringComparison.Ordinal))
{
all.Add(p.ConvertedName);
}
}
endpoint.CachedParams = all;
}
else if (profile.Parameters.Length == 0)
{
// Profile says "URL-only" — empty hash set means no params in the key.
endpoint.CachedParams = [];
}
else
{
endpoint.CachedParams = [.. profile.Parameters];
}
}
// Validate When rules: each rule's Parameter must be (a) a real routine parameter and
// (b) present in the resolved CachedParams (so different rule-evaluations don't collide
// on a shared cache entry). Rules failing either check are dropped with a Warning. The
// surviving subset is stored on the endpoint for runtime evaluation.
if (profile.When is not null && profile.When.Length > 0)
{
var validRules = new List<CacheWhenRule>(profile.When.Length);
foreach (var rule in profile.When)
{
if (string.IsNullOrWhiteSpace(rule.Parameter))
{
Logger?.CacheWhenRuleDropped(endpoint.CacheProfile, "(unnamed)", "missing 'Parameter'");
continue;
}
// Is rule.Parameter a real routine parameter?
bool isRoutineParam = false;
foreach (var rp in endpoint.Routine.Parameters)
{
if (string.Equals(rp.ActualName, rule.Parameter, StringComparison.Ordinal) ||
string.Equals(rp.ConvertedName, rule.Parameter, StringComparison.Ordinal))
{
isRoutineParam = true;
break;
}
}
if (!isRoutineParam)
{
Logger?.CacheWhenRuleDropped(endpoint.CacheProfile, rule.Parameter,
$"not a parameter of routine {endpoint.Routine.Schema}.{endpoint.Routine.Name}");
continue;
}
// Is rule.Parameter in the resolved cache key set?
// CachedParams null is impossible at this point (we set it from profile.Parameters above),
// but we'd accept any param name as in-key if it ever were null (= use-all-params).
if (endpoint.CachedParams is not null &&
!endpoint.CachedParams.Contains(rule.Parameter))
{
Logger?.CacheWhenRuleDropped(endpoint.CacheProfile, rule.Parameter,
$"not in the cache-key parameter list for endpoint {endpoint.Method} {endpoint.Path}; would cause cache entries to collide across different rule-matches");
continue;
}
validRules.Add(rule);
}
endpoint.CacheWhen = validRules.Count == 0 ? null : [.. validRules];
}
Logger?.CacheProfileResolved(
endpoint.CacheProfile,
string.Concat(endpoint.Method.ToString(), " ", endpoint.Path),
endpoint.CacheExpiresIn?.ToString() ?? "(none)",
endpoint.CachedParams is null ? "(none)" : string.Join(",", endpoint.CachedParams),
endpoint.CacheWhen is null ? "(none)" : string.Join(",", endpoint.CacheWhen.Select(r => r.Parameter)));
}
else
{
if (!unresolved.TryGetValue(endpoint.CacheProfile, out var endpoints))
{
endpoints = new List<string>();
unresolved[endpoint.CacheProfile] = endpoints;
}
endpoints.Add(string.Concat(endpoint.Method.ToString(), " ", endpoint.Path));
}
}
if (unresolved.Count > 0)
{
var sb = new StringBuilder();
sb.AppendLine("Unknown cache profile name(s) referenced by @cache_profile annotation:");
foreach (var (name, endpoints) in unresolved)
{
sb.Append(" - '").Append(name).Append("' referenced by ").Append(endpoints.Count).AppendLine(" endpoint(s):");
foreach (var ep in endpoints)
{
sb.Append(" ").AppendLine(ep);
}
}
sb.Append("Available profiles: ").AppendLine(string.Join(", ", Options.CacheOptions.Profiles.Keys));
throw new InvalidOperationException(sb.ToString());
}
// Information-level warning: profile registered but no endpoint references it (likely typo in annotation).
foreach (var profileName in Options.CacheOptions.Profiles.Keys)
{
if (!usedProfiles.Contains(profileName))
{
Logger?.CacheProfileUnused(profileName);
}
}
}
else
{
// No profiles configured but endpoints reference one — fail with a clear message rather than silently
// ignoring the annotation (which would leave caching half-broken at runtime).
foreach (var entry in lookup.Values)
{
if (entry.Endpoint.CacheProfile is not null)
{
throw new InvalidOperationException(
$"Endpoint {entry.Endpoint.Method} {entry.Endpoint.Path} references cache profile " +
$"'{entry.Endpoint.CacheProfile}' but no profiles are configured in CacheOptions.Profiles.");
}
}
}
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?.LogWarning("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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