/// <summary>
/// Send a CloudWatch event with optional event details and resources it applies to. This event is forwarded to the configured EventBridge.
/// </summary>
/// <param name="logger">The <see cref="ILambdaSharpLogger"/> instance to use.</param>
/// <param name="source">Name of the event source.</param>
/// <param name="detailType">Free-form string used to decide what fields to expect in the event detail.</param>
/// <param name="detail">Data-structure to serialize as a JSON string. If value is already a <code>string</code>, it is sent as-is. There is no other schema imposed. The data-structure may contain fields and nested subobjects.</param>
/// <param name="resources">Optional AWS or custom resources, identified by unique identifier (e.g. ARN), which the event primarily concerns. Any number, including zero, may be present.</param>
public static void LogEvent <T>(this ILambdaSharpLogger logger, string source, string detailType, T detail, IEnumerable <string> resources = null)
{
// augment event resources with LambdaSharp specific resources
var lambdaResources = new List <string>();
if (resources != null)
{
lambdaResources.AddRange(resources);
}
if (logger.Info.ModuleId != null)
{
lambdaResources.Add($"lambdasharp:stack:{logger.Info.ModuleId}");
}
var moduleFullName = logger.Info.GetModuleFullName();
if (moduleFullName != null)
{
lambdaResources.Add($"lambdasharp:module:{moduleFullName}");
}
if (logger.Info.DeploymentTier != null)
{
lambdaResources.Add($"lambdasharp:tier:{logger.Info.DeploymentTier}");
}
if (logger.Info.ModuleInfo != null)
{
lambdaResources.Add($"lambdasharp:moduleinfo:{logger.Info.ModuleInfo}");
}
var moduleOrigin = logger.Info.GetModuleOrigin();
if (moduleOrigin != null)
{
lambdaResources.Add($"lambdasharp:origin:{moduleOrigin}");
}
if (logger.Info.AppId != null)
{
lambdaResources.Add($"lambdasharp:app:{logger.Info.AppId}");
}
// create event record for logging
var eventRecord = new LambdaEventRecord {
EventBus = "default",
Source = source,
DetailType = detailType,
Detail = (detail is string detailText)
? detailText
: JsonSerializer.Serialize(detail, JsonSerializerOptions),
Resources = lambdaResources
};
eventRecord.SetTime(DateTimeOffset.UtcNow);
logger.LogRecord(eventRecord);
}
}
/// <summary>
/// Log a CloudWatch metric. The metric is picked up by CloudWatch logs and automatically ingested as a CloudWatch metric.
/// </summary>
/// <param name="logger">The <see cref="ILambdaSharpLogger"/> instance to use.</param>
/// <param name="namespace">Metric namespace.</param>
/// <param name="metrics">Enumeration of metrics, including their name, value, and unit.</param>
/// <param name="dimensionNames">Metric dimensions as comma-separated list (e.g. [ "A", "A,B" ]).</param>
/// <param name="dimensionValues">Dictionary of dimesion name-value pairs.</param>
public static void LogMetric(
this ILambdaSharpLogger logger,
string @namespace,
IEnumerable <LambdaMetric> metrics,
IEnumerable <string> dimensionNames,
Dictionary <string, string> dimensionValues
)
{
if (!metrics.Any())
{
// nothing to do
return;
}
if (dimensionNames.Count() > 9)
{
throw new ArgumentException("metric cannot exceed 9 dimensions", nameof(dimensionNames));
}
var targets = new Dictionary <string, object>();
// validate and process metrics
var index = 0;
foreach (var metric in metrics)
{
if (string.IsNullOrEmpty(metric.Name))
{
throw new ArgumentException($"metric name cannot be empty (index {index})");
}
AssertNotReservedName(metric.Name, "metric");
if (double.IsNaN(metric.Value) || double.IsNegativeInfinity(metric.Value) || double.IsPositiveInfinity(metric.Value))
{
// these values are rejected by CloudWatch metrics
throw new ArgumentException($"metric '{metric.Name}' has an out-of-range value");
}
if (!targets.TryAdd(metric.Name, metric.Value))
{
throw new ArgumentException($"conflicting metric name: {metric.Name}");
}
++index;
}
// validate and process dimension values
index = 0;
foreach (var dimensionValue in dimensionValues)
{
if (string.IsNullOrEmpty(dimensionValue.Key))
{
throw new ArgumentException($"dimension name cannot be empty (index {index})");
}
if (string.IsNullOrEmpty(dimensionValue.Value))
{
throw new ArgumentException($"dimension value cannot be empty (index {index})");
}
AssertNotReservedName(dimensionValue.Key, "dimension");
if (!targets.TryAdd(dimensionValue.Key, dimensionValue.Value))
{
throw new ArgumentException($"conflicting dimension name: {dimensionValue.Key}");
}
++index;
}
// validate and process metric dimensions
var metricDimensions = dimensionNames
.Select(dimension => dimension
.Split(',')
.Select(dim => dim.Trim())
.ToList()
)
.ToList();
foreach (var metricDimension in metricDimensions.SelectMany(dimension => dimension))
{
if (!dimensionValues.ContainsKey(metricDimension))
{
throw new ArgumentException($"missing dimension value: {metricDimension}");
}
}
// create embedded metrics data-structure:
var record = new LambdaMetricsRecord {
Aws = new EmbeddedCloudWatchMetrics {
CloudWatchMetrics =
{
new CloudWatchMetrics {
Namespace = @namespace,
Dimensions = metricDimensions,
Metrics = metrics.Select(metric => new CloudWatchMetricValue {
Name = metric.Name,
Unit = ConvertUnit(metric.Unit)
}).ToList()
}
}
},
TargetMembers = targets
};
// log metric record
logger.LogRecord(record);
// local functions
void AssertNotReservedName(string name, string parameterType)
{
switch (name)
{
case "_aws":
case "Source":
case "Version":
throw new ArgumentException($"{parameterType} name cannot be named '{name}'");
default:
break;
}
}
string ConvertUnit(LambdaMetricUnit unit)
{
switch (unit)
{
// these enum names need to be mapped to their correct CloudWatch metrics unit counterpart
case LambdaMetricUnit.BytesPerSecond:
return("Bytes/Second");
case LambdaMetricUnit.KilobytesPerSecond:
return("Kilobytes/Second");
case LambdaMetricUnit.MegabytesPerSecond:
return("Megabytes/Second");
case LambdaMetricUnit.GigabytesPerSecond:
return("Gigabytes/Second");
case LambdaMetricUnit.TerabytesPerSecond:
return("Terabytes/Second");
case LambdaMetricUnit.BitsPerSecond:
return("Bits/Second");
case LambdaMetricUnit.KilobitsPerSecond:
return("Kilobits/Second");
case LambdaMetricUnit.MegabitsPerSecond:
return("Megabits/Second");
case LambdaMetricUnit.GigabitsPerSecond:
return("Gigabits/Second");
case LambdaMetricUnit.TerabitsPerSecond:
return("Terabits/Second");
case LambdaMetricUnit.CountPerSecond:
return("Count/Second");
// the remaining enums are good as is
default:
return(unit.ToString());
}
}
}
