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489 lines (428 loc) · 19.7 KB
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using System.Diagnostics;
using System.Net.Http.Headers;
using System.Text;
using Npgsql;
using NpgsqlTypes;
namespace NpgsqlRest.HttpClientType;
public class HttpClientTypeHandler(HttpTypeDefinition definition, Dictionary<string, string>.AlternateLookup<ReadOnlySpan<char>>? replacements = null)
{
private static readonly HttpClient SharedClient = new()
{
Timeout = Timeout.InfiniteTimeSpan // We handle timeout per-request
};
/// <summary>
/// HttpClient for self-referencing calls (relative paths). Uses SelfBaseUrl or a custom handler.
/// </summary>
private static HttpClient? _selfClient;
private string? _resolvedUrl;
/// <summary>
/// Base URL for resolving relative paths (e.g., "/api/test" → "http://localhost:5000/api/test").
/// Auto-detected from the server's listening address, or set via HttpClientOptions.SelfBaseUrl.
/// </summary>
internal static string? SelfBaseUrl { get; set; }
/// <summary>
/// Set a custom HttpClient for self-referencing calls (e.g., from WebApplicationFactory TestServer).
/// </summary>
internal static void SetSelfClient(HttpClient client)
{
_selfClient = client;
}
// Response properties
private int StatusCode { get; set; }
private string? Body { get; set; }
private string? ResponseHeaders { get; set; }
private string? ContentType { get; set; }
private bool IsSuccess { get; set; }
private string? ErrorMessage { get; set; }
public async Task InvokeAsync(CancellationToken cancellationToken = default)
{
int maxRetries = definition.RetryDelays?.Length ?? 0;
for (int attempt = 0; attempt <= maxRetries; attempt++)
{
var startTimestamp = Stopwatch.GetTimestamp();
_resolvedUrl = ResolveValue(definition.Url);
var resolvedUrl = _resolvedUrl;
if (attempt == 0)
{
Logger?.LogDebug("HTTP client starting {Method} request to '{Url}'", definition.Method, resolvedUrl);
}
else
{
Logger?.LogDebug("HTTP client retrying {Method} request to '{Url}' (attempt {Attempt}/{MaxRetries})",
definition.Method, resolvedUrl, attempt + 1, maxRetries + 1);
}
try
{
bool isSelfCall = definition.Url.StartsWith('/');
// Use internal request handler for self-calls (bypasses HTTP stack entirely)
if (isSelfCall && InternalRequestHandler.IsAvailable)
{
var url = definition.NeedsParsing && replacements is not null
? Formatter.FormatString(definition.Url.AsSpan(), replacements.Value).ToString()
: definition.Url;
var internalResponse = await InternalRequestHandler.ExecuteAsync(
definition.Method,
url,
definition.Headers,
definition.NeedsParsing && definition.Body is not null && replacements is not null
? Formatter.FormatString(definition.Body.AsSpan(), replacements.Value).ToString()
: definition.Body,
definition.ContentType,
cancellationToken);
StatusCode = internalResponse.StatusCode;
Body = internalResponse.Body;
ContentType = internalResponse.ContentType;
ResponseHeaders = internalResponse.Headers;
IsSuccess = internalResponse.IsSuccess;
ErrorMessage = IsSuccess ? null : $"Internal request returned {StatusCode}";
var elapsed = Stopwatch.GetElapsedTime(startTimestamp);
Logger?.LogDebug("Internal request to '{Url}' completed with status {StatusCode} in {Elapsed}ms",
resolvedUrl, StatusCode, elapsed.TotalMilliseconds.ToString("F1"));
if (!IsSuccess && attempt < maxRetries && ShouldRetry(StatusCode))
{
Logger?.LogWarning("Internal request to '{Url}' returned {StatusCode}, retrying after {Delay}ms",
resolvedUrl, StatusCode, definition.RetryDelays![attempt].TotalMilliseconds);
await Task.Delay(definition.RetryDelays![attempt], cancellationToken);
continue;
}
return;
}
using var request = CreateRequest();
using var cts = CreateTimeoutCancellationTokenSource(cancellationToken);
var client = isSelfCall && _selfClient is not null ? _selfClient : SharedClient;
using var response = await client.SendAsync(request, cts?.Token ?? cancellationToken);
await ProcessResponseAsync(response, startTimestamp);
if (!IsSuccess && attempt < maxRetries && ShouldRetry(StatusCode))
{
Logger?.LogWarning("HTTP client request to '{Url}' returned {StatusCode}, retrying after {Delay}ms",
resolvedUrl, StatusCode, definition.RetryDelays![attempt].TotalMilliseconds);
await Task.Delay(definition.RetryDelays![attempt], cancellationToken);
continue;
}
return;
}
catch (OperationCanceledException) when (!cancellationToken.IsCancellationRequested)
{
StatusCode = 408;
IsSuccess = false;
ErrorMessage = $"Request timed out after {definition.Timeout?.TotalSeconds ?? 30} seconds";
if (attempt < maxRetries)
{
Logger?.LogWarning("HTTP client request to '{Url}' timed out, retrying after {Delay}ms",
resolvedUrl, definition.RetryDelays![attempt].TotalMilliseconds);
await Task.Delay(definition.RetryDelays![attempt], cancellationToken);
continue;
}
Logger?.LogWarning("HTTP client request to '{Url}' timed out after {Timeout}s",
resolvedUrl, definition.Timeout?.TotalSeconds ?? 30);
}
catch (HttpRequestException ex)
{
StatusCode = (int?)ex.StatusCode ?? 0;
IsSuccess = false;
ErrorMessage = ex.Message;
if (attempt < maxRetries)
{
Logger?.LogWarning("HTTP client request to '{Url}' failed ({Message}), retrying after {Delay}ms",
resolvedUrl, ex.Message, definition.RetryDelays![attempt].TotalMilliseconds);
await Task.Delay(definition.RetryDelays![attempt], cancellationToken);
continue;
}
Logger?.LogError(ex, "HTTP client request to '{Url}' failed with status {StatusCode}",
resolvedUrl, StatusCode);
}
catch (Exception ex)
{
StatusCode = 0;
IsSuccess = false;
ErrorMessage = ex.Message;
Logger?.LogError(ex, "HTTP client request to '{Url}' failed with unexpected error", resolvedUrl);
return; // Unexpected errors are not retryable
}
}
}
/// <summary>
/// Runs the outbound call, routing it through <see cref="HttpResponseCache"/> when the type opts in
/// via <c>@cache</c> and caching is enabled globally. On a cache hit (or a coalesced concurrent call)
/// the cached response is applied to this handler so the fill loop reads it exactly as a live response.
/// </summary>
public async Task InvokeWithCacheAsync(CancellationToken cancellationToken = default)
{
if (!Options.HttpClientOptions.CacheEnabled || !definition.CacheEnabled)
{
await InvokeAsync(cancellationToken);
return;
}
var key = ComputeCacheKey();
var cached = await HttpResponseCache.GetOrCreateAsync(
key,
definition.CacheDuration,
async ct =>
{
await InvokeAsync(ct);
return SnapshotResponse();
},
cancellationToken);
ApplyResponse(cached);
}
/// <summary>
/// Cache key for this request: method + resolved URL + resolved content-type + resolved headers
/// (sorted) + resolved body. Placeholders are resolved so per-request values vary the key; a type
/// with no placeholders produces a constant key (one shared cached response).
/// </summary>
private string ComputeCacheKey()
{
var sb = new StringBuilder();
sb.Append(definition.Method).Append('\n');
sb.Append(ResolveValue(definition.Url)).Append('\n');
if (definition.ContentType is not null)
{
sb.Append(ResolveValue(definition.ContentType));
}
sb.Append('\n');
if (definition.Headers is { Count: > 0 })
{
foreach (var header in definition.Headers.OrderBy(h => h.Key, StringComparer.Ordinal))
{
sb.Append(header.Key).Append(':').Append(ResolveValue(header.Value)).Append('\n');
}
}
sb.Append('\n');
if (definition.Body is not null)
{
sb.Append(ResolveValue(definition.Body));
}
return sb.ToString();
}
private CachedHttpResponse SnapshotResponse() =>
new(StatusCode, Body, ResponseHeaders, ContentType, IsSuccess, ErrorMessage);
private void ApplyResponse(CachedHttpResponse r)
{
StatusCode = r.StatusCode;
Body = r.Body;
ResponseHeaders = r.ResponseHeaders;
ContentType = r.ContentType;
IsSuccess = r.IsSuccess;
ErrorMessage = r.ErrorMessage;
}
private bool ShouldRetry(int statusCode)
{
if (definition.RetryOnStatusCodes is null)
{
return true; // No filter = retry any failure
}
return definition.RetryOnStatusCodes.Contains(statusCode);
}
private HttpRequestMessage CreateRequest()
{
var url = ResolveValue(definition.Url);
// Resolve relative paths against the server's own base URL (skip if _selfClient handles it via BaseAddress)
if (url.StartsWith('/') && _selfClient is null && SelfBaseUrl is not null)
{
url = string.Concat(SelfBaseUrl, url);
}
var method = new HttpMethod(definition.Method);
var request = new HttpRequestMessage(method, url);
// Add headers
if (definition.Headers is { Count: > 0 })
{
foreach (var header in definition.Headers)
{
var headerValue = ResolveValue(header.Value);
request.Headers.TryAddWithoutValidation(header.Key, headerValue);
}
}
// Add body
if (definition.Body is not null)
{
var body = ResolveValue(definition.Body);
var contentType = definition.ContentType is not null
? ResolveValue(definition.ContentType)
: "application/json";
request.Content = new StringContent(body);
request.Content.Headers.ContentType = MediaTypeHeaderValue.Parse(contentType);
}
return request;
}
private CancellationTokenSource? CreateTimeoutCancellationTokenSource(CancellationToken cancellationToken)
{
if (definition.Timeout is null)
{
return null;
}
var cts = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken);
cts.CancelAfter(definition.Timeout.Value);
return cts;
}
private async Task ProcessResponseAsync(HttpResponseMessage response, long startTimestamp)
{
StatusCode = (int)response.StatusCode;
IsSuccess = response.IsSuccessStatusCode;
ContentType = response.Content.Headers.ContentType?.ToString();
Body = await response.Content.ReadAsStringAsync();
// Build response headers as JSON object string
ResponseHeaders = BuildHeadersJson(response);
var duration = Stopwatch.GetElapsedTime(startTimestamp);
Logger?.LogDebug("HTTP client request to '{Url}' completed with status {StatusCode}, content-type: {ContentType}, body length: {BodyLength}, duration: {Duration}ms",
_resolvedUrl ?? definition.Url, StatusCode, ContentType, Body?.Length ?? 0, duration.TotalMilliseconds);
}
private static string BuildHeadersJson(HttpResponseMessage response)
{
var sb = new StringBuilder();
sb.Append('{');
bool first = true;
foreach (var header in response.Headers)
{
if (!first) sb.Append(',');
first = false;
sb.Append(PgConverters.SerializeString(header.Key));
sb.Append(':');
sb.Append(PgConverters.SerializeString(string.Join(", ", header.Value)));
}
foreach (var header in response.Content.Headers)
{
if (!first) sb.Append(',');
first = false;
sb.Append(PgConverters.SerializeString(header.Key));
sb.Append(':');
sb.Append(PgConverters.SerializeString(string.Join(", ", header.Value)));
}
sb.Append('}');
return sb.ToString();
}
private string ResolveValue(string value)
{
if (definition.NeedsParsing is false || replacements is null)
{
return value;
}
return new string(Formatter.FormatString(value.AsSpan(), replacements.Value));
}
public static async Task InvokeAllAsync(
IEnumerable<string> typeNames,
Dictionary<string, string>.AlternateLookup<ReadOnlySpan<char>>? replacements,
NpgsqlParameterCollection parameters,
CancellationToken cancellationToken)
{
var handlers = new Dictionary<string, HttpClientTypeHandler>();
var tasks = new List<(string TypeName, HttpClientTypeHandler Handler, Task Task)>();
foreach (var typeName in typeNames)
{
// A DB-function composite parameter is expanded into one parameter per field,
// each carrying the same CustomType, so typeNames can contain the same type
// multiple times. Fire exactly one outbound call per distinct HTTP type - the
// fill loop below resolves handlers by distinct type name as well.
if (handlers.ContainsKey(typeName))
{
continue;
}
if (HttpClientTypes.Definitions.TryGetValue(typeName, out var definition))
{
var handler = new HttpClientTypeHandler(definition, replacements);
handlers[typeName] = handler;
tasks.Add((typeName, handler, handler.InvokeWithCacheAsync(cancellationToken)));
}
}
await Task.WhenAll(tasks.Select(t => t.Task));
for (var i = 0; i < parameters.Count; i++)
{
var parameter = (NpgsqlRestParameter)parameters[i];
if (parameter.TypeDescriptor.CustomType is null)
{
continue;
}
if (!handlers.TryGetValue(parameter.TypeDescriptor.CustomType, out var handler))
{
continue;
}
// Single composite parameter (SQL files): build composite text value
if (parameter.TypeDescriptor.CustomTypeName is null)
{
parameter.Value = BuildCompositeTextValue(handler, parameter.CompositeFieldNames);
continue;
}
// Expanded field parameter (functions): fill individual field
bool asText = parameter.NpgsqlDbType == NpgsqlDbType.Unknown || parameter.TypeDescriptor.IsText;
if (string.Equals(parameter.TypeDescriptor.CustomTypeName, Options.HttpClientOptions.ResponseStatusCodeField, StringComparison.InvariantCulture))
{
parameter.Value = asText ? handler.StatusCode.ToString() : handler.StatusCode;
}
else if (string.Equals(parameter.TypeDescriptor.CustomTypeName, Options.HttpClientOptions.ResponseBodyField, StringComparison.InvariantCulture))
{
parameter.Value = (object?)handler.Body ?? DBNull.Value;
}
else if (string.Equals(parameter.TypeDescriptor.CustomTypeName, Options.HttpClientOptions.ResponseHeadersField, StringComparison.InvariantCulture))
{
parameter.Value = (object?)handler.ResponseHeaders ?? DBNull.Value;
}
else if (string.Equals(parameter.TypeDescriptor.CustomTypeName, Options.HttpClientOptions.ResponseContentTypeField, StringComparison.InvariantCulture))
{
parameter.Value = (object?)handler.ContentType ?? DBNull.Value;
}
else if (string.Equals(parameter.TypeDescriptor.CustomTypeName, Options.HttpClientOptions.ResponseSuccessField, StringComparison.InvariantCulture))
{
parameter.Value = asText ? (object)handler.IsSuccess.ToString().ToLowerInvariant() : handler.IsSuccess;
}
else if (string.Equals(parameter.TypeDescriptor.CustomTypeName, Options.HttpClientOptions.ResponseErrorMessageField, StringComparison.InvariantCulture))
{
parameter.Value = (object?)handler.ErrorMessage ?? DBNull.Value;
}
}
}
/// <summary>
/// Build a PostgreSQL composite type text representation from HTTP response values.
/// Format: (field1_value,field2_value,...) where values are double-quoted and internal quotes escaped.
/// Field order comes from the composite type definition in pg_catalog.
/// </summary>
private static object BuildCompositeTextValue(HttpClientTypeHandler handler, string[]? fieldNames)
{
if (fieldNames is null || fieldNames.Length == 0)
{
return DBNull.Value;
}
var httpOptions = Options.HttpClientOptions;
var sb = new System.Text.StringBuilder();
sb.Append('(');
for (int i = 0; i < fieldNames.Length; i++)
{
if (i > 0) sb.Append(',');
var fieldName = fieldNames[i];
string? value = null;
if (string.Equals(fieldName, httpOptions.ResponseBodyField, StringComparison.InvariantCulture))
{
value = handler.Body;
}
else if (string.Equals(fieldName, httpOptions.ResponseStatusCodeField, StringComparison.InvariantCulture))
{
value = handler.StatusCode.ToString();
}
else if (string.Equals(fieldName, httpOptions.ResponseHeadersField, StringComparison.InvariantCulture))
{
value = handler.ResponseHeaders;
}
else if (string.Equals(fieldName, httpOptions.ResponseContentTypeField, StringComparison.InvariantCulture))
{
value = handler.ContentType;
}
else if (string.Equals(fieldName, httpOptions.ResponseSuccessField, StringComparison.InvariantCulture))
{
value = handler.IsSuccess ? "t" : "f";
}
else if (string.Equals(fieldName, httpOptions.ResponseErrorMessageField, StringComparison.InvariantCulture))
{
value = handler.ErrorMessage;
}
if (value is null)
{
// NULL: empty between commas
continue;
}
// Double-quote the value, escaping internal double-quotes
sb.Append('"');
sb.Append(value.Replace("\"", "\"\""));
sb.Append('"');
}
sb.Append(')');
return sb.ToString();
}
}
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