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Merge pull request #467 from serverlessworkflow/feat-form-based-input
Updates the modal to create a new workflow instance by adding a form-based editor for the instance's input
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177 changes: 177 additions & 0 deletions
177
src/core/Synapse.Core.Infrastructure/Services/AvroSchemaHandler.cs
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| // Copyright © 2024-Present The Synapse Authors | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"), | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| using Neuroglia; | ||
| using Neuroglia.Serialization; | ||
| using ServerlessWorkflow.Sdk; | ||
| using System.Net; | ||
| using Avro.IO; | ||
| using Avro; | ||
| using Avro.Generic; | ||
|
|
||
| namespace Synapse.Core.Infrastructure.Services; | ||
|
|
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| /// <summary> | ||
| /// Represents the <see cref="ISchemaHandler"/> implementation used to handle Avro schemas | ||
| /// </summary> | ||
| /// <param name="externalResourceProvider">The service used to provide external resources</param> | ||
| /// <param name="jsonSerializer">The service used to serialize/deserialize data to/from JSON</param> | ||
| public class AvroSchemaHandler(IExternalResourceProvider externalResourceProvider, IJsonSerializer jsonSerializer) | ||
| : ISchemaHandler | ||
| { | ||
|
|
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| /// <summary> | ||
| /// Gets the service used to provide external resources | ||
| /// </summary> | ||
| protected IExternalResourceProvider ExternalResourceProvider { get; } = externalResourceProvider; | ||
|
|
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| /// <summary> | ||
| /// Gets the service used to serialize/deserialize data to/from JSON | ||
| /// </summary> | ||
| protected IJsonSerializer JsonSerializer { get; } = jsonSerializer; | ||
|
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| /// <inheritdoc/> | ||
| public virtual bool Supports(string format) => format.Equals(SchemaFormat.Avro, StringComparison.OrdinalIgnoreCase); | ||
|
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| /// <inheritdoc/> | ||
| public virtual async Task<IOperationResult> ValidateAsync(object graph, SchemaDefinition schema, CancellationToken cancellationToken = default) | ||
| { | ||
| ArgumentNullException.ThrowIfNull(graph); | ||
| ArgumentNullException.ThrowIfNull(schema); | ||
| if (!this.Supports(schema.Format)) throw new NotSupportedException($"The specified schema format '{schema.Format}' is not supported in this context"); | ||
| Schema avroSchema; | ||
| try | ||
| { | ||
| var json = string.Empty; | ||
| if (schema.Resource == null) | ||
| { | ||
| json = this.JsonSerializer.SerializeToText(schema.Document); | ||
| } | ||
| else | ||
| { | ||
| using var stream = await this.ExternalResourceProvider.ReadAsync(schema.Resource, cancellationToken: cancellationToken).ConfigureAwait(false); | ||
| using var streamReader = new StreamReader(stream); | ||
| json = await streamReader.ReadToEndAsync(cancellationToken).ConfigureAwait(false); | ||
| } | ||
| avroSchema = Schema.Parse(json); | ||
| } | ||
| catch (Exception ex) | ||
| { | ||
| return new OperationResult((int)HttpStatusCode.BadRequest, null, new Neuroglia.Error() | ||
| { | ||
| Type = ErrorType.Validation, | ||
| Title = ErrorTitle.Validation, | ||
| Status = ErrorStatus.Validation, | ||
| Detail = $"An error occurred while parsing the specified schema: {ex}" | ||
| }); | ||
| } | ||
| byte[] avroData; | ||
| try | ||
| { | ||
| using var memoryStream = new MemoryStream(); | ||
| var writer = new BinaryEncoder(memoryStream); | ||
| var datumWriter = new GenericDatumWriter<object>(avroSchema); | ||
| var avroObject = ConvertToAvroCompatible(graph, avroSchema); | ||
| datumWriter.Write(avroObject, writer); | ||
| avroData = memoryStream.ToArray(); | ||
| } | ||
| catch (Exception ex) | ||
| { | ||
| return new OperationResult((int)HttpStatusCode.BadRequest, null, new Neuroglia.Error() | ||
| { | ||
| Type = ErrorType.Validation, | ||
| Title = ErrorTitle.Validation, | ||
| Status = ErrorStatus.Validation, | ||
| Detail = $"An error occurred while serializing the specified data to Avro: {ex}" | ||
| }); | ||
| } | ||
| try | ||
| { | ||
| using var memoryStream = new MemoryStream(avroData); | ||
| var reader = new BinaryDecoder(memoryStream); | ||
| var datumReader = new GenericDatumReader<GenericRecord>(avroSchema, avroSchema); | ||
| datumReader.Read(null!, reader); | ||
| return await Task.FromResult(new OperationResult((int)HttpStatusCode.OK)); | ||
| } | ||
| catch (Exception ex) | ||
| { | ||
| return new OperationResult((int)HttpStatusCode.BadRequest, null, new Neuroglia.Error() | ||
| { | ||
| Type = ErrorType.Validation, | ||
| Title = ErrorTitle.Validation, | ||
| Status = ErrorStatus.Validation, | ||
| Detail = ex.Message | ||
| }); | ||
| } | ||
| } | ||
|
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| object ConvertToAvroCompatible(object graph, Schema schema) | ||
| { | ||
| return schema switch | ||
| { | ||
| RecordSchema recordSchema => ConvertToGenericRecord(graph, recordSchema), | ||
| ArraySchema arraySchema => ConvertToArray(graph, arraySchema), | ||
| MapSchema mapSchema => ConvertToMap(graph, mapSchema), | ||
| UnionSchema unionSchema => ConvertToUnion(graph, unionSchema), | ||
| FixedSchema fixedSchema => graph, | ||
| EnumSchema enumSchema => graph, | ||
| PrimitiveSchema primitiveSchema => graph, | ||
| _ => throw new NotSupportedException($"Unsupported schema type: {schema.GetType().Name}") | ||
| }; | ||
| } | ||
|
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| GenericRecord ConvertToGenericRecord(object graph, RecordSchema recordSchema) | ||
| { | ||
| var record = new GenericRecord(recordSchema); | ||
| var properties = graph.GetType().GetProperties(); | ||
| foreach (var field in recordSchema.Fields) | ||
| { | ||
| var property = properties.FirstOrDefault(p => p.Name.Equals(field.Name, StringComparison.OrdinalIgnoreCase)); | ||
| if (property != null) | ||
| { | ||
| var value = property.GetValue(graph)!; | ||
| record.Add(field.Name, ConvertToAvroCompatible(value, field.Schema)); | ||
| } | ||
| } | ||
| return record; | ||
| } | ||
|
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| object ConvertToArray(object graph, ArraySchema arraySchema) | ||
| { | ||
| if (graph is not IEnumerable<object> enumerable) throw new InvalidOperationException("Provided object is not an array or enumerable"); | ||
| return enumerable.Select(item => ConvertToAvroCompatible(item, arraySchema.ItemSchema)).ToList(); | ||
| } | ||
|
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| object ConvertToMap(object graph, MapSchema mapSchema) | ||
| { | ||
| if (graph is not IDictionary<string, object> dictionary) throw new InvalidOperationException("Provided object is not a map or dictionary"); | ||
| return dictionary.ToDictionary(kvp => kvp.Key, kvp => ConvertToAvroCompatible(kvp.Value, mapSchema.ValueSchema)); | ||
| } | ||
|
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| object ConvertToUnion(object graph, UnionSchema unionSchema) | ||
| { | ||
| foreach (var schema in unionSchema.Schemas) | ||
| { | ||
| try | ||
| { | ||
| return ConvertToAvroCompatible(graph, schema); | ||
| } | ||
| catch | ||
| { | ||
| // Continue to next schema in the union | ||
| } | ||
| } | ||
| throw new InvalidOperationException("Provided object does not match any schema in the union."); | ||
| } | ||
|
|
||
| } |
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