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675 lines (583 loc) · 23.1 KB
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using System.Collections.Frozen;
using Npgsql;
namespace NpgsqlRest.HttpClientType;
public class HttpClientTypes
{
private const string TypeQuery = @"select
(quote_ident(n.nspname) || '.' || quote_ident(t.typname))::regtype::text as name,
des.description as comment,
array_agg(quote_ident(a.attname)) as att_names
from
pg_catalog.pg_type t
join pg_catalog.pg_namespace n on n.oid = t.typnamespace
join pg_catalog.pg_class c on t.typrelid = c.oid and c.relkind = 'c'
join pg_catalog.pg_attribute a on t.typrelid = a.attrelid and a.attisdropped is false
join pg_catalog.pg_description des on t.oid = des.objoid
where
nspname not like 'pg_%'
and nspname <> 'information_schema'
and des.description is not null
and a.attnum > 0
group by n.nspname, t.typname, des.description";
public static FrozenDictionary<string, HttpTypeDefinition> Definitions { get; private set; } = FrozenDictionary<string, HttpTypeDefinition>.Empty;
public static bool NeedsParsing { get; private set; }
public HttpClientTypes(IApplicationBuilder? builder, RetryStrategy? retryStrategy)
{
bool shouldDispose = true;
NpgsqlConnection? connection = null;
try
{
Options.CreateAndOpenSourceConnection(builder?.ApplicationServices, ref connection, ref shouldDispose, "HttpClientTypes");
if (connection is null)
{
return;
}
using var command = connection.CreateCommand();
command.CommandText = TypeQuery;
command.LogCommand(nameof(HttpClientTypes));
using NpgsqlDataReader reader = command.ExecuteReaderWithRetry(retryStrategy);
var definitions = new Dictionary<string, HttpTypeDefinition>();
bool needsParsing = false;
while (reader.Read())
{
string typeName = reader.GetString(0);
string? comment = reader.IsDBNull(1) ? null : reader.GetString(1);
string[] attNames = reader.IsDBNull(2) ? Array.Empty<string>() : reader.GetFieldValue<string[]>(2);
if (string.IsNullOrWhiteSpace(comment))
{
continue;
}
var typeDefinition = ParseHttpTypeDefinition(comment, typeName);
if (typeDefinition is not null)
{
definitions[typeName] = typeDefinition;
if (typeDefinition.NeedsParsing)
{
needsParsing = true;
}
}
}
Definitions = definitions.ToFrozenDictionary();
NeedsParsing = needsParsing;
}
finally
{
if (connection is not null && shouldDispose is true)
{
connection.Dispose();
}
}
}
public HttpTypeDefinition? ParseHttpTypeDefinition(string comment, string? typeName = null)
{
if (string.IsNullOrWhiteSpace(comment))
{
return null;
}
var span = comment.AsSpan();
int pos = 0;
TimeSpan? timeout = null;
TimeSpan[]? retryDelays = null;
HashSet<int>? retryOnStatusCodes = null;
bool cacheEnabled = false;
TimeSpan? cacheDuration = null;
// Parse directives before the request line
while (pos < span.Length)
{
int lineEnd = span[pos..].IndexOfAny('\r', '\n');
var line = lineEnd == -1 ? span[pos..] : span[pos..(pos + lineEnd)];
var trimmedLine = TrimSpan(line);
// Skip empty lines
if (trimmedLine.IsEmpty)
{
pos += lineEnd == -1 ? line.Length : lineEnd;
if (pos < span.Length && span[pos] == '\r') pos++;
if (pos < span.Length && span[pos] == '\n') pos++;
continue;
}
// Check for timeout directive (with or without # prefix)
if (TryParseTimeoutDirective(trimmedLine, typeName, out var parsedTimeout))
{
timeout = parsedTimeout;
pos += lineEnd == -1 ? line.Length : lineEnd;
if (pos < span.Length && span[pos] == '\r') pos++;
if (pos < span.Length && span[pos] == '\n') pos++;
continue;
}
// Check for retry_delay directive
if (TryParseRetryDirective(trimmedLine, typeName, out var parsedDelays, out var parsedRetryCodes))
{
retryDelays = parsedDelays;
retryOnStatusCodes = parsedRetryCodes;
pos += lineEnd == -1 ? line.Length : lineEnd;
if (pos < span.Length && span[pos] == '\r') pos++;
if (pos < span.Length && span[pos] == '\n') pos++;
continue;
}
// Check for cache directive
if (TryParseCacheDirective(trimmedLine, typeName, out var parsedCacheDuration))
{
cacheEnabled = true;
cacheDuration = parsedCacheDuration;
pos += lineEnd == -1 ? line.Length : lineEnd;
if (pos < span.Length && span[pos] == '\r') pos++;
if (pos < span.Length && span[pos] == '\n') pos++;
continue;
}
// Check for # comment (non-timeout directive)
if (trimmedLine[0] == '#')
{
pos += lineEnd == -1 ? line.Length : lineEnd;
if (pos < span.Length && span[pos] == '\r') pos++;
if (pos < span.Length && span[pos] == '\n') pos++;
continue;
}
// Not a directive, must be the request line
break;
}
// Find first line (request line)
int firstLineEnd = span[pos..].IndexOfAny('\r', '\n');
var firstLine = firstLineEnd == -1 ? span[pos..] : span[pos..(pos + firstLineEnd)];
firstLine = TrimSpan(firstLine);
if (firstLine.IsEmpty)
{
Logger?.LogWarning("Type '{TypeName}': HTTP type definition has no request line (expected 'METHOD URL')", typeName);
return null;
}
// Parse request line: METHOD URL [HTTP/version]
int firstSpace = firstLine.IndexOf(' ');
if (firstSpace <= 0)
{
Logger?.LogWarning("Type '{TypeName}': HTTP type definition request line is missing URL: '{RequestLine}'", typeName, new string(firstLine));
return null;
}
var methodSpan = firstLine[..firstSpace];
// Fast uppercase check and validation (most methods are already uppercase)
Span<char> methodUpper = stackalloc char[methodSpan.Length];
for (int i = 0; i < methodSpan.Length; i++)
{
methodUpper[i] = char.ToUpperInvariant(methodSpan[i]);
}
if (!IsValidHttpMethod(methodUpper))
{
Logger?.LogWarning("Type '{TypeName}': HTTP type definition has invalid HTTP method '{Method}'. Supported methods: GET, POST, PUT, PATCH, DELETE", typeName, new string(methodSpan));
return null;
}
// Find URL (skip spaces after method)
var afterMethod = firstLine[(firstSpace + 1)..];
afterMethod = TrimSpan(afterMethod);
if (afterMethod.IsEmpty)
{
Logger?.LogWarning("Type '{TypeName}': HTTP type definition is missing URL after method '{Method}'", typeName, new string(methodUpper));
return null;
}
// URL ends at space (before HTTP/version) or end of line
int urlEnd = afterMethod.IndexOf(' ');
var urlSpan = urlEnd == -1 ? afterMethod : afterMethod[..urlEnd];
// Check URL for placeholders
bool needsParsing = ContainsPlaceholder(urlSpan);
var result = new HttpTypeDefinition
{
Method = new string(methodUpper),
Url = new string(urlSpan),
Timeout = timeout,
RetryDelays = retryDelays,
RetryOnStatusCodes = retryOnStatusCodes,
CacheEnabled = cacheEnabled,
CacheDuration = cacheDuration
};
// Move past first line
if (firstLineEnd == -1)
{
NormalizeCacheDirective(result, typeName);
result.NeedsParsing = needsParsing;
return result;
}
pos += firstLineEnd;
// Skip \r\n or \n
if (pos < span.Length && span[pos] == '\r') pos++;
if (pos < span.Length && span[pos] == '\n') pos++;
Dictionary<string, string>? headers = null;
int bodyStart = -1;
// Parse headers
while (pos < span.Length)
{
// Find end of current line
int lineEnd = span[pos..].IndexOfAny('\r', '\n');
var line = lineEnd == -1 ? span[pos..] : span[pos..(pos + lineEnd)];
// Empty line indicates end of headers
if (line.IsEmpty || line.IsWhiteSpace())
{
pos += lineEnd == -1 ? line.Length : lineEnd;
if (pos < span.Length && span[pos] == '\r') pos++;
if (pos < span.Length && span[pos] == '\n') pos++;
bodyStart = pos;
break;
}
// Directives may also appear in the header section (after the request line), not only
// before it. Check for them before treating the line as an HTTP header. A directive's
// separator/value shape means real headers (which carry a 'Name-Word: value') don't match.
if (TryParseTimeoutDirective(line, typeName, out var hdrTimeout))
{
result.Timeout = hdrTimeout;
pos += lineEnd == -1 ? line.Length : lineEnd;
if (pos < span.Length && span[pos] == '\r') pos++;
if (pos < span.Length && span[pos] == '\n') pos++;
continue;
}
if (TryParseRetryDirective(line, typeName, out var hdrDelays, out var hdrCodes))
{
result.RetryDelays = hdrDelays;
result.RetryOnStatusCodes = hdrCodes;
pos += lineEnd == -1 ? line.Length : lineEnd;
if (pos < span.Length && span[pos] == '\r') pos++;
if (pos < span.Length && span[pos] == '\n') pos++;
continue;
}
if (TryParseCacheDirective(line, typeName, out var hdrCacheDuration))
{
result.CacheEnabled = true;
result.CacheDuration = hdrCacheDuration;
pos += lineEnd == -1 ? line.Length : lineEnd;
if (pos < span.Length && span[pos] == '\r') pos++;
if (pos < span.Length && span[pos] == '\n') pos++;
continue;
}
int colonIndex = line.IndexOf(':');
if (colonIndex > 0)
{
var headerName = TrimSpan(line[..colonIndex]);
var headerValue = TrimSpan(line[(colonIndex + 1)..]);
if (!headerName.IsEmpty)
{
// Check header value for placeholders
if (!needsParsing && ContainsPlaceholder(headerValue))
{
needsParsing = true;
}
if (headerName.Equals("Content-Type", StringComparison.OrdinalIgnoreCase))
{
result.ContentType = new string(headerValue);
}
else
{
headers ??= new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
headers[new string(headerName)] = new string(headerValue);
}
}
}
pos += lineEnd == -1 ? line.Length : lineEnd;
if (pos < span.Length && span[pos] == '\r') pos++;
if (pos < span.Length && span[pos] == '\n') pos++;
}
if (headers is { Count: > 0 })
{
result.Headers = headers;
}
// Parse body
if (bodyStart >= 0 && bodyStart < span.Length)
{
var bodySpan = span[bodyStart..];
if (!bodySpan.IsEmpty && !bodySpan.IsWhiteSpace())
{
result.Body = new string(bodySpan);
// Check body for placeholders
if (!needsParsing && ContainsPlaceholder(bodySpan))
{
needsParsing = true;
}
}
}
NormalizeCacheDirective(result, typeName);
result.NeedsParsing = needsParsing;
return result;
}
// Caching is only safe for GET (idempotent reads). A @cache directive on any other method is
// almost always a mistake; warn and ignore it rather than caching a mutating call. Applied after
// the whole comment is parsed so it sees @cache whether it appeared before the request line or
// among the headers, and after the method is known.
private static void NormalizeCacheDirective(HttpTypeDefinition result, string? typeName)
{
if (!result.CacheEnabled)
{
return;
}
if (!string.Equals(result.Method, "GET", StringComparison.Ordinal))
{
Logger?.LogWarning("Type '{TypeName}': @cache is only supported for GET requests; ignoring it for '{Method}'", typeName, result.Method);
result.CacheEnabled = false;
result.CacheDuration = null;
}
else if (result.CacheDuration is null)
{
Logger?.LogWarning("Type '{TypeName}': @cache has no expiration interval; responses will be cached until the process restarts", typeName);
}
}
private static ReadOnlySpan<char> TrimSpan(ReadOnlySpan<char> span)
{
int start = 0;
int end = span.Length - 1;
while (start <= end && char.IsWhiteSpace(span[start])) start++;
while (end >= start && char.IsWhiteSpace(span[end])) end--;
return start > end ? ReadOnlySpan<char>.Empty : span[start..(end + 1)];
}
private static readonly TimeSpan DefaultTimeout = TimeSpan.FromSeconds(30);
private static bool IsValidHttpMethod(ReadOnlySpan<char> method)
{
return method.Length switch
{
3 => method is "GET" || method is "PUT",
4 => method is "POST",
5 => method is "PATCH",
6 => method is "DELETE",
_ => false
};
}
private static bool ContainsPlaceholder(ReadOnlySpan<char> span)
{
// Find {key} where key is identifier chars (letters, digits, underscore)
// This avoids false positives from JSON like {"name": "value"}
int pos = 0;
while (pos < span.Length)
{
int openBrace = span[pos..].IndexOf('{');
if (openBrace < 0) return false;
int start = pos + openBrace + 1;
if (start >= span.Length) return false;
// Check if first char after { is a valid identifier start (letter or underscore)
char firstChar = span[start];
if (char.IsLetter(firstChar) || firstChar == '_')
{
// Find the closing brace and verify all chars between are identifier chars
int i = start;
while (i < span.Length && (char.IsLetterOrDigit(span[i]) || span[i] == '_'))
{
i++;
}
if (i < span.Length && span[i] == '}' && i > start)
{
return true;
}
}
pos = start;
}
return false;
}
private static TimeSpan ParseTimeoutValue(ReadOnlySpan<char> value, string? typeName)
{
if (value.IsEmpty)
{
return DefaultTimeout;
}
var valueStr = new string(value);
// If contains colon, try TimeSpan.Parse (e.g., "00:00:30")
if (value.Contains(':'))
{
if (TimeSpan.TryParse(valueStr, out var ts))
{
return ts;
}
Logger?.LogError("Type '{TypeName}': Failed to parse timeout value '{Value}' as TimeSpan, using default {Default}s", typeName, valueStr, DefaultTimeout.TotalSeconds);
return DefaultTimeout;
}
// If only digits, treat as seconds
bool allDigits = true;
foreach (var c in value)
{
if (!char.IsDigit(c))
{
allDigits = false;
break;
}
}
if (allDigits)
{
if (int.TryParse(valueStr, out var seconds))
{
return TimeSpan.FromSeconds(seconds);
}
Logger?.LogError("Type '{TypeName}': Failed to parse timeout value '{Value}' as seconds, using default {Default}s", typeName, valueStr, DefaultTimeout.TotalSeconds);
return DefaultTimeout;
}
// Otherwise use PostgresInterval parser (e.g., "30s", "5m", "1h")
var result = Parser.ParsePostgresInterval(valueStr);
if (result.HasValue)
{
return result.Value;
}
Logger?.LogError("Type '{TypeName}': Failed to parse timeout value '{Value}', using default {Default}s", typeName, valueStr, DefaultTimeout.TotalSeconds);
return DefaultTimeout;
}
private static bool TryParseTimeoutDirective(ReadOnlySpan<char> line, string? typeName, out TimeSpan timeout)
{
timeout = DefaultTimeout;
var trimmed = TrimSpan(line);
// Remove leading # if present
if (!trimmed.IsEmpty && trimmed[0] == '#')
{
trimmed = TrimSpan(trimmed[1..]);
}
// Remove leading @ if present
if (!trimmed.IsEmpty && trimmed[0] == '@')
{
trimmed = TrimSpan(trimmed[1..]);
}
// Check for "timeout" keyword (case-insensitive)
if (!trimmed.StartsWith("timeout", StringComparison.OrdinalIgnoreCase))
{
return false;
}
var afterKeyword = trimmed[7..]; // Skip "timeout"
// Handle separator: space, '=', or ':'
afterKeyword = TrimSpan(afterKeyword);
if (afterKeyword.IsEmpty)
{
return false;
}
// Skip separator character if present
if (afterKeyword[0] == '=' || afterKeyword[0] == ':')
{
afterKeyword = TrimSpan(afterKeyword[1..]);
}
if (afterKeyword.IsEmpty)
{
return false;
}
timeout = ParseTimeoutValue(afterKeyword, typeName);
return true;
}
private static bool TryParseRetryDirective(
ReadOnlySpan<char> line,
string? typeName,
out TimeSpan[]? delays,
out HashSet<int>? statusCodes)
{
delays = null;
statusCodes = null;
var trimmed = TrimSpan(line);
// Remove leading # if present
if (!trimmed.IsEmpty && trimmed[0] == '#')
{
trimmed = TrimSpan(trimmed[1..]);
}
// Remove leading @ if present
if (!trimmed.IsEmpty && trimmed[0] == '@')
{
trimmed = TrimSpan(trimmed[1..]);
}
// Check for "retry_delay" keyword (case-insensitive)
if (!trimmed.StartsWith("retry_delay", StringComparison.OrdinalIgnoreCase))
{
return false;
}
var afterKeyword = trimmed[11..]; // Skip "retry_delay"
// Handle separator: space, '=', or ':'
afterKeyword = TrimSpan(afterKeyword);
if (afterKeyword.IsEmpty)
{
return false;
}
if (afterKeyword[0] == '=' || afterKeyword[0] == ':')
{
afterKeyword = TrimSpan(afterKeyword[1..]);
}
if (afterKeyword.IsEmpty)
{
return false;
}
// Split by " on " to separate delays from status codes
var afterStr = new string(afterKeyword);
var onIndex = afterStr.IndexOf(" on ", StringComparison.OrdinalIgnoreCase);
string delaysPart;
string? codesPart = null;
if (onIndex >= 0)
{
delaysPart = afterStr[..onIndex];
codesPart = afterStr[(onIndex + 4)..]; // Skip " on "
}
else
{
delaysPart = afterStr;
}
// Parse delays: comma-separated time values
var delayParts = delaysPart.Split(',', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
if (delayParts.Length == 0)
{
Logger?.LogError("Type '{TypeName}': retry_delay has no delay values", typeName);
return false;
}
var parsedDelays = new TimeSpan[delayParts.Length];
for (int i = 0; i < delayParts.Length; i++)
{
parsedDelays[i] = ParseTimeoutValue(delayParts[i].AsSpan(), typeName);
}
delays = parsedDelays;
// Parse status codes if present
if (codesPart is not null)
{
var codeParts = codesPart.Split(',', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
var codes = new HashSet<int>();
foreach (var code in codeParts)
{
if (int.TryParse(code, out var statusCode))
{
codes.Add(statusCode);
}
else
{
Logger?.LogError("Type '{TypeName}': Failed to parse retry status code '{Code}'", typeName, code);
}
}
if (codes.Count > 0)
{
statusCodes = codes;
}
}
return true;
}
private static bool TryParseCacheDirective(ReadOnlySpan<char> line, string? typeName, out TimeSpan? duration)
{
duration = null;
var trimmed = TrimSpan(line);
// Remove leading # if present
if (!trimmed.IsEmpty && trimmed[0] == '#')
{
trimmed = TrimSpan(trimmed[1..]);
}
// Remove leading @ if present
if (!trimmed.IsEmpty && trimmed[0] == '@')
{
trimmed = TrimSpan(trimmed[1..]);
}
// Check for "cache" keyword (case-insensitive). Must be the whole token, so "cache_profile"
// or other future "cache*" directives are not swallowed here.
if (!trimmed.StartsWith("cache", StringComparison.OrdinalIgnoreCase))
{
return false;
}
var afterKeyword = trimmed[5..]; // Skip "cache"
// Bare "@cache" (no value) → enabled with no expiration.
if (afterKeyword.IsEmpty)
{
return true;
}
// The next char must be a separator (space, '=', ':'); otherwise this is a different keyword.
char sep = afterKeyword[0];
if (sep != ' ' && sep != '\t' && sep != '=' && sep != ':')
{
return false;
}
if (sep == '=' || sep == ':')
{
afterKeyword = afterKeyword[1..];
}
afterKeyword = TrimSpan(afterKeyword);
// "@cache" followed only by separator → enabled with no expiration.
if (afterKeyword.IsEmpty)
{
return true;
}
duration = ParseTimeoutValue(afterKeyword, typeName);
return true;
}
}
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