private CloudEvent DecodeGenericRecord(GenericRecord record, IEnumerable <CloudEventAttribute> extensionAttributes)
{
if (!record.TryGetValue(AttributeName, out var attrObj))
{
throw new ArgumentException($"Record has no '{AttributeName}' field");
}
IDictionary <string, object> recordAttributes = (IDictionary <string, object>)attrObj;
if (!recordAttributes.TryGetValue(CloudEventsSpecVersion.SpecVersionAttribute.Name, out var versionId) ||
!(versionId is string versionIdString))
{
throw new ArgumentException("Specification version attribute is missing");
}
CloudEventsSpecVersion version = CloudEventsSpecVersion.FromVersionId(versionIdString);
if (version is null)
{
throw new ArgumentException($"Unsupported CloudEvents spec version '{versionIdString}'");
}
var cloudEvent = new CloudEvent(version, extensionAttributes);
cloudEvent.Data = record.TryGetValue(DataName, out var data) ? data : null;
foreach (var keyValuePair in recordAttributes)
{
string key = keyValuePair.Key;
object value = keyValuePair.Value;
if (value is null)
{
continue;
}
if (key == CloudEventsSpecVersion.SpecVersionAttribute.Name || key == DataName)
{
continue;
}
// The Avro schema allows the value to be a Boolean, integer, string or bytes.
// Timestamps and URIs are represented as strings, so we just use SetAttributeFromString to handle those.
// TODO: This does mean that any extensions of these types must have been registered beforehand.
if (value is bool || value is int || value is byte[])
{
cloudEvent[key] = value;
}
else if (value is string)
{
cloudEvent.SetAttributeFromString(key, (string)value);
}
else
{
throw new ArgumentException($"Invalid value type from Avro record: {value.GetType()}");
}
}
return(Validation.CheckCloudEventArgument(cloudEvent, nameof(record)));
}
public CloudEvent DecodeGenericRecord(GenericRecord record, IEnumerable <CloudEventAttribute> extensionAttributes)
{
if (!record.TryGetValue("attribute", out var attrObj))
{
return(null);
}
IDictionary <string, object> recordAttributes = (IDictionary <string, object>)attrObj;
CloudEventsSpecVersion specVersion = CloudEventsSpecVersion.Default;
if (recordAttributes.TryGetValue(CloudEventsSpecVersion.SpecVersionAttribute.Name, out var versionId) &&
versionId is string versionIdString)
{
specVersion = CloudEventsSpecVersion.FromVersionId(versionIdString);
}
var cloudEvent = new CloudEvent(specVersion, extensionAttributes);
cloudEvent.Data = record.TryGetValue(DataName, out var data) ? data : null;
foreach (var keyValuePair in recordAttributes)
{
string key = keyValuePair.Key;
object value = keyValuePair.Value;
if (value is null)
{
continue;
}
if (key == CloudEventsSpecVersion.SpecVersionAttribute.Name || key == DataName)
{
continue;
}
// The Avro schema allows the value to be a Boolean, integer, string or bytes.
// Timestamps and URIs are represented as strings, so we just use SetAttributeFromString to handle those.
if (value is bool || value is int || value is byte[])
{
cloudEvent[key] = value;
}
else if (value is string)
{
cloudEvent.SetAttributeFromString(key, (string)value);
}
else
{
throw new ArgumentException($"Invalid value type from Avro record: {value.GetType()}");
}
}
return(cloudEvent);
}
/// <summary>
/// Converts this HTTP request into a CloudEvent object.
/// </summary>
/// <param name="httpRequest">The HTTP request to decode. Must not be null.</param>
/// <param name="formatter">The event formatter to use to process the request body. Must not be null.</param>
/// <param name="extensions">The extension attributes to use when populating the CloudEvent. May be null.</param>
/// <returns>The decoded CloudEvent.</returns>
/// <exception cref="ArgumentException">The request does not contain a CloudEvent.</exception>
public static async ValueTask <CloudEvent> ReadCloudEventAsync(this HttpRequest httpRequest,
CloudEventFormatter formatter,
params CloudEventAttribute[] extensionAttributes)
{
if (HasCloudEventsContentType(httpRequest))
{
// TODO: Handle formatter being null
return(await formatter.DecodeStructuredModeMessageAsync(httpRequest.Body, MimeUtilities.CreateContentTypeOrNull(httpRequest.ContentType), extensionAttributes).ConfigureAwait(false));
}
else
{
var headers = httpRequest.Headers;
if (!headers.TryGetValue(HttpUtilities.SpecVersionHttpHeader, out var versionId))
{
throw new ArgumentException("Request is not a CloudEvent");
}
var version = CloudEventsSpecVersion.FromVersionId(versionId.First());
if (version is null)
{
throw new ArgumentException($"Unsupported CloudEvents spec version '{versionId.First()}'");
}
var cloudEvent = new CloudEvent(version, extensionAttributes);
foreach (var header in headers)
{
string attributeName = HttpUtilities.GetAttributeNameFromHeaderName(header.Key);
if (attributeName is null || attributeName == CloudEventsSpecVersion.SpecVersionAttribute.Name)
{
continue;
}
string attributeValue = HttpUtilities.DecodeHeaderValue(header.Value.First());
cloudEvent.SetAttributeFromString(attributeName, attributeValue);
}
cloudEvent.DataContentType = httpRequest.ContentType;
if (httpRequest.Body is Stream body)
{
// TODO: This is a bit ugly. We have code in BinaryDataUtilities to handle this, but
// we'd rather not expose it...
var memoryStream = new MemoryStream();
await body.CopyToAsync(memoryStream).ConfigureAwait(false);
formatter.DecodeBinaryModeEventData(memoryStream.ToArray(), cloudEvent);
}
return(cloudEvent);
}
}
/// <summary>
/// Converts this HTTP request into a CloudEvent object, with the given extensions,
/// overriding the formatter.
/// </summary>
/// <param name="httpRequest">HTTP request</param>
/// <param name="formatter">The event formatter to use to process the request body.</param>
/// <param name="extensions">List of extension instances</param>
/// <returns>A CloudEvent instance or 'null' if the request message doesn't hold a CloudEvent</returns>
public static async ValueTask <CloudEvent> ReadCloudEventAsync(this HttpRequest httpRequest,
ICloudEventFormatter formatter,
params CloudEventAttribute[] extensionAttributes)
{
if (HasCloudEventsContentType(httpRequest))
{
// TODO: Handle formatter being null
return(await formatter.DecodeStructuredEventAsync(httpRequest.Body, extensionAttributes).ConfigureAwait(false));
}
else
{
var headers = httpRequest.Headers;
CloudEventsSpecVersion version = CloudEventsSpecVersion.Default;
if (headers.TryGetValue(HttpUtilities.SpecVersionHttpHeader, out var values))
{
string versionId = values.First();
version = CloudEventsSpecVersion.FromVersionId(versionId);
}
var cloudEvent = new CloudEvent(version, extensionAttributes);
foreach (var header in headers)
{
string attributeName = HttpUtilities.GetAttributeNameFromHeaderName(header.Key);
if (attributeName is null || attributeName == CloudEventsSpecVersion.SpecVersionAttribute.Name)
{
continue;
}
string attributeValue = HttpUtilities.DecodeHeaderValue(header.Value.First());
cloudEvent.SetAttributeFromString(attributeName, attributeValue);
}
cloudEvent.DataContentType = httpRequest.ContentType;
if (httpRequest.Body is Stream body)
{
// TODO: This is a bit ugly.
var memoryStream = new MemoryStream();
await body.CopyToAsync(memoryStream).ConfigureAwait(false);
if (memoryStream.Length != 0)
{
cloudEvent.Data = formatter.DecodeData(memoryStream.ToArray(), cloudEvent.DataContentType);
}
}
return(cloudEvent);
}
}
