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224 lines (206 loc) · 9.11 KB
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using System.Text;
using Npgsql;
using NpgsqlTypes;
namespace NpgsqlRest;
public class RoutineSource(
string? schemaSimilarTo = null,
string? schemaNotSimilarTo = null,
string[]? includeSchemas = null,
string[]? excludeSchemas = null,
string? nameSimilarTo = null,
string? nameNotSimilarTo = null,
string[]? includeNames = null,
string[]? excludeNames = null,
string? query = null,
CommentsMode? commentsMode = null) : IRoutineSource
{
private readonly IRoutineSourceParameterFormatter _formatter = new RoutineSourceParameterFormatter();
public string? SchemaSimilarTo { get; init; } = schemaSimilarTo;
public string? SchemaNotSimilarTo { get; init; } = schemaNotSimilarTo;
public string[]? IncludeSchemas { get; init; } = includeSchemas;
public string[]? ExcludeSchemas { get; init; } = excludeSchemas;
public string? NameSimilarTo { get; init; } = nameSimilarTo;
public string? NameNotSimilarTo { get; init; } = nameNotSimilarTo;
public string[]? IncludeNames { get; init; } = includeNames;
public string[]? ExcludeNames { get; init; } = excludeNames;
public string Query { get; init; } = query ?? RoutineSourceQuery.Query;
public CommentsMode? CommentsMode { get; } = commentsMode;
public IEnumerable<(Routine, IRoutineSourceParameterFormatter)> Read(NpgsqlRestOptions options)
{
using var connection = new NpgsqlConnection(options.ConnectionString);
using var command = connection.CreateCommand();
command.CommandText = Query;
AddParameter(SchemaSimilarTo ?? options.SchemaSimilarTo); // $1
AddParameter(SchemaNotSimilarTo ?? options.SchemaNotSimilarTo); // $2
AddParameter(IncludeSchemas ?? options.IncludeSchemas, true); // $3
AddParameter(ExcludeSchemas ?? options.ExcludeSchemas, true); // $4
AddParameter(NameSimilarTo ?? options.NameSimilarTo); // $5
AddParameter(NameNotSimilarTo ?? options.NameNotSimilarTo); // $6
AddParameter(IncludeNames ?? options.IncludeNames, true); // $7
AddParameter(ExcludeNames ?? options.ExcludeNames, true); // $8
connection.Open();
using NpgsqlDataReader reader = command.ExecuteReader();
while (reader.Read())
{
var type = reader.Get<string>("type");
var paramTypes = reader.Get<string[]>("param_types");
var returnType = reader.Get<string>("return_type");
var name = reader.Get<string>("name");
var volatility = reader.Get<char>("volatility_option");
var hasGet =
name.Contains("_get_", StringComparison.OrdinalIgnoreCase) ||
name.StartsWith("get_", StringComparison.OrdinalIgnoreCase) ||
name.EndsWith("_get", StringComparison.OrdinalIgnoreCase);
var crudType = hasGet ? CrudType.Select : (volatility == 'v' ? CrudType.Update : CrudType.Select);
var paramNames = reader.Get<string[]>("param_names");
var isVoid = string.Equals(returnType, "void", StringComparison.Ordinal);
var schema = reader.Get<string>("schema");
var returnsSet = reader.Get<bool>("returns_set");
var returnRecordTypes = reader.Get<string[]>("return_record_types");
TypeDescriptor[] returnTypeDescriptor;
if (isVoid)
{
returnTypeDescriptor = [];
}
else
{
returnTypeDescriptor = returnRecordTypes.Select(x => new TypeDescriptor(x)).ToArray();
}
var returnRecordNames = reader.Get<string[]>("return_record_names");
var paramDefaults = reader.Get<string?[]>("param_defaults");
bool isUnnamedRecord = reader.Get<bool>("is_unnamed_record");
var routineType = type.GetEnum<RoutineType>();
var callIdent = routineType == RoutineType.Procedure ? "call " : "select ";
var paramCount = reader.Get<int>("param_count");
var returnRecordCount = reader.Get<int>("return_record_count");
var variadic = reader.Get<bool>("has_variadic");
var expression = string.Concat(
(isVoid || returnRecordCount == 1)
? callIdent
: string.Concat(callIdent, string.Join(",", returnRecordNames), " from "),
schema,
".",
name,
"(",
variadic && paramCount > 0 ? "variadic " : "");
var simpleDefinition = new StringBuilder();
simpleDefinition.AppendLine(string.Concat(
routineType.ToString().ToLower(), " ",
schema, ".",
name, "(",
paramCount == 0 ? ")" : ""));
if (paramCount > 0)
{
for (var i = 0; i < paramCount; i++)
{
var paramName = paramNames[i];
var defaultValue = paramDefaults[i];
var paramType = paramTypes[i];
var fullParamType = defaultValue == null ? paramType : $"{paramType} DEFAULT {defaultValue}";
simpleDefinition
.AppendLine(string.Concat(" ", paramName, " ", fullParamType, i == paramCount - 1 ? "" : ","));
}
simpleDefinition.AppendLine(")");
}
if (!returnsSet)
{
simpleDefinition.AppendLine(string.Concat("returns ", returnType));
}
else
{
if (isUnnamedRecord)
{
simpleDefinition.AppendLine(string.Concat($"returns setof {returnType}"));
}
else
{
simpleDefinition.AppendLine("returns table(");
for (var i = 0; i < returnRecordCount; i++)
{
var returnParamName = returnRecordNames[i];
var returnParamType = returnRecordTypes[i];
simpleDefinition
.AppendLine(string.Concat(" ", returnParamName, " ", returnParamType, i == returnRecordCount - 1 ? "" : ","));
}
simpleDefinition.AppendLine(")");
}
}
yield return (
new Routine(
type: routineType,
schema: schema,
name: name,
comment: reader.Get<string>("comment"),
isStrict: reader.Get<bool>("is_strict"),
crudType: crudType,
returnsRecordType: string.Equals(returnType, "record", StringComparison.OrdinalIgnoreCase),
returnsSet: returnsSet,
columnCount: returnRecordCount,
columnNames: returnRecordNames,
returnsUnnamedSet: isUnnamedRecord,
columnsTypeDescriptor: returnTypeDescriptor,
isVoid: isVoid,
paramCount: paramCount,
paramNames: paramNames,
paramTypeDescriptor: paramTypes
.Select((x, i) => new TypeDescriptor(x, hasDefault: paramDefaults[i] is not null))
.ToArray(),
expression: expression,
fullDefinition: reader.Get<string>("definition"),
simpleDefinition: simpleDefinition.ToString(),
tags: [routineType.ToString().ToLowerInvariant(), volatility switch
{
'v' => "volatile",
's' => "stable",
'i' => "immutable",
_ => "other"
}]),
_formatter);
}
yield break;
void AddParameter(object? value, bool isArray = false)
{
if (value is null)
{
value = DBNull.Value;
}
else if (isArray && value is string[] array)
{
if (array.Length == 0)
{
value = DBNull.Value;
}
}
else if (!isArray && value is string str)
{
if (string.IsNullOrWhiteSpace(str))
{
value = DBNull.Value;
}
}
command.Parameters.Add(new NpgsqlParameter
{
NpgsqlDbType = isArray ? NpgsqlDbType.Text | NpgsqlDbType.Array : NpgsqlDbType.Text,
Value = value
});
}
}
}
internal static class Extensions
{
internal static T Get<T>(this NpgsqlDataReader reader, string name)
{
var value = reader[name];
if (value == DBNull.Value)
{
return default!;
}
return (T)value;
}
internal static T GetEnum<T>(this string? value) where T : struct
{
Enum.TryParse<T>(value, true, out var result);
// return the first enum (Other) when no match
return result;
}
}
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