Implement Fargate pod and container objects

providers/aws/fargate/fargate.go

@@ -0,0 +1,47 @@
+package fargate
+
+const (
+	// EC2 compute resource units.
+
+	// VCPU is one virtual CPU core in EC2.
+	VCPU int64 = 1024
+	// MiB is 2^20 bytes.
+	MiB int64 = 1024 * 1024
+	// GiB is 2^30 bytes.
+	GiB int64 = 1024 * MiB
+)
+
+// TaskSize represents a Fargate task size.
+type taskSize struct {
+	cpu    int64
+	memory memorySizeRange
+}
+
+// MemorySizeRange represents a range of Fargate task memory sizes.
+type memorySizeRange struct {
+	min int64
+	max int64
+	inc int64
+}
+
+var (
+	// Fargate task size table.
+	// https://docs.aws.amazon.com/AmazonECS/latest/developerguide/task_definition_parameters.html#task_size
+	//
+	// VCPU     Memory (in MiBs, available in 1GiB increments)
+	// ====     ===================
+	//  256     512, 1024 ...  2048
+	//  512          1024 ...  4096
+	// 1024          2048 ...  8192
+	// 2048          4096 ... 16384
+	// 4096          8192 ... 30720
+	//
+	taskSizeTable = []taskSize{
+		{VCPU / 4, memorySizeRange{512 * MiB, 512 * MiB, 1}},
+		{VCPU / 4, memorySizeRange{1 * GiB, 2 * GiB, 1 * GiB}},
+		{VCPU / 2, memorySizeRange{1 * GiB, 4 * GiB, 1 * GiB}},
+		{1 * VCPU, memorySizeRange{2 * GiB, 8 * GiB, 1 * GiB}},
+		{2 * VCPU, memorySizeRange{4 * GiB, 16 * GiB, 1 * GiB}},
+		{4 * VCPU, memorySizeRange{8 * GiB, 30 * GiB, 1 * GiB}},
+	}
+)