[WIP] feat(ipamd): move introspection API types to separate package

pkg/ipamd/api/v1/types.go

@@ -0,0 +1,265 @@
+package v1
+
+import (
+	"fmt"
+	"net"
+	"time"
+)
+
+const (
+	// minENILifeTime is the shortest time before we consider deleting a newly created ENI
+	minENILifeTime = 1 * time.Minute
+)
+
+// IPAMKey is the IPAM primary key.  Quoting CNI spec:
+//
+//	Plugins that store state should do so using a primary key of
+//	(network name, CNI_CONTAINERID, CNI_IFNAME).
+type IPAMKey struct {
+	NetworkName string `json:"networkName"`
+	ContainerID string `json:"containerID"`
+	IfName      string `json:"ifName"`
+}
+
+// IsZero returns true if object is equal to the golang zero/null value.
+func (k IPAMKey) IsZero() bool {
+	return k == IPAMKey{}
+}
+
+// String() implements the fmt.Stringer interface.
+func (k IPAMKey) String() string {
+	return fmt.Sprintf("%s/%s/%s", k.NetworkName, k.ContainerID, k.IfName)
+}
+
+// IPAMMetadata is the metadata associated with IP allocations.
+type IPAMMetadata struct {
+	K8SPodNamespace string `json:"k8sPodNamespace,omitempty"`
+	K8SPodName      string `json:"k8sPodName,omitempty"`
+}
+
+// ENI represents a single ENI. Exported fields will be marshaled for introspection.
+type ENI struct {
+	// CreateTime is excluded from marshalled representation, used only by internal datastore
+	CreateTime time.Time `json:"-"`
+
+	// AWS ENI ID
+	ID string
+	// IsPrimary indicates whether ENI is a primary ENI
+	IsPrimary bool
+	// IsTrunk indicates whether this ENI is used to provide pods with dedicated ENIs
+	IsTrunk bool
+	// IsEFA indicates whether this ENI is tagged as an EFA
+	IsEFA bool
+	// DeviceNumber is the device number of ENI (0 means the primary ENI)
+	DeviceNumber int
+	// IPv4Addresses shows whether each address is assigned, the key is IP address, which must
+	// be in dot-decimal notation with no leading zeros and no whitespace(eg: "10.1.0.253")
+	// Key is the IP address - PD: "IP/28" and SIP: "IP/32"
+	AvailableIPv4Cidrs map[string]*CidrInfo
+	//IPv6CIDRs contains information tied to IPv6 Prefixes attached to the ENI
+	IPv6Cidrs map[string]*CidrInfo
+}
+
+// IsTooYoung returns true if the ENI hasn't been around long enough to be deleted.
+func (e *ENI) IsTooYoung() bool {
+	return time.Since(e.CreateTime) < minENILifeTime
+}
+
+// HasIPInCooling returns true if an IP address was unassigned recently.
+func (e *ENI) HasIPInCooling(ipCooldownPeriod time.Duration) bool {
+	for _, assignedaddr := range e.AvailableIPv4Cidrs {
+		for _, addr := range assignedaddr.IPAddresses {
+			if addr.InCoolingPeriod(ipCooldownPeriod) {
+				return true
+			}
+		}
+	}
+	return false
+}
+
+// HasPods returns true if the ENI has pods assigned to it.
+func (e *ENI) HasPods() bool {
+	return e.AssignedIPv4Addresses() != 0
+}
+
+// AddressInfo contains information about an IP, Exported fields will be marshaled for introspection.
+type AddressInfo struct {
+	Address string
+
+	IPAMKey        IPAMKey
+	IPAMMetadata   IPAMMetadata
+	AssignedTime   time.Time
+	UnassignedTime time.Time
+}
+
+// CidrInfo
+type CidrInfo struct {
+	// Either v4/v6 Host or LPM Prefix
+	Cidr net.IPNet
+	// Key is individual IP addresses from the Prefix - /32 (v4) or /128 (v6)
+	IPAddresses map[string]*AddressInfo
+	// true if Cidr here is an LPM prefix
+	IsPrefix bool
+	// IP Address Family of the Cidr
+	AddressFamily string
+}
+
+func (cidr *CidrInfo) Size() int {
+	ones, bits := cidr.Cidr.Mask.Size()
+	return (1 << (bits - ones))
+}
+
+func (e *ENI) findAddressForSandbox(ipamKey IPAMKey) (*CidrInfo, *AddressInfo) {
+	// Either v4 or v6 for now.
+	// Check in V4 prefixes
+	for _, availableCidr := range e.AvailableIPv4Cidrs {
+		for _, addr := range availableCidr.IPAddresses {
+			if addr.IPAMKey == ipamKey {
+				return availableCidr, addr
+			}
+		}
+	}
+
+	// Check in V6 prefixes
+	for _, availableCidr := range e.IPv6Cidrs {
+		for _, addr := range availableCidr.IPAddresses {
+			if addr.IPAMKey == ipamKey {
+				return availableCidr, addr
+			}
+		}
+	}
+	return nil, nil
+}
+
+// AssignedIPv4Addresses is the number of IP addresses already assigned
+func (e *ENI) AssignedIPv4Addresses() int {
+	count := 0
+	for _, availableCidr := range e.AvailableIPv4Cidrs {
+		count += availableCidr.AssignedIPAddressesInCidr()
+	}
+	return count
+}
+
+// AssignedIPAddressesInCidr is the number of IP addresses already assigned in the IPv4 CIDR
+func (cidr *CidrInfo) AssignedIPAddressesInCidr() int {
+	count := 0
+	//SIP : This will run just once and count will be 0 if addr is not assigned or addr is not allocated yet(unused IP)
+	//PD : This will return count of number /32 assigned in /28 CIDR.
+	for _, addr := range cidr.IPAddresses {
+		if addr.Assigned() {
+			count++
+		}
+	}
+	return count
+}
+
+type CidrStats struct {
+	AssignedIPs int
+	CooldownIPs int
+}
+
+// Gets number of assigned IPs and the IPs in cooldown from a given CIDR
+func (cidr *CidrInfo) GetIPStatsFromCidr(ipCooldownPeriod time.Duration) CidrStats {
+	stats := CidrStats{}
+	for _, addr := range cidr.IPAddresses {
+		if addr.Assigned() {
+			stats.AssignedIPs++
+		} else if addr.InCoolingPeriod(ipCooldownPeriod) {
+			stats.CooldownIPs++
+		}
+	}
+	return stats
+}
+
+// Assigned returns true iff the address is allocated to a pod/sandbox.
+func (addr AddressInfo) Assigned() bool {
+	return !addr.IPAMKey.IsZero()
+}
+
+// InCoolingPeriod checks whether an addr is in ipCooldownPeriod
+func (addr AddressInfo) InCoolingPeriod(ipCooldownPeriod time.Duration) bool {
+	return time.Since(addr.UnassignedTime) <= ipCooldownPeriod
+}
+
+// ENIPool is a collection of ENI, keyed by ENI ID
+type ENIPool map[string]*ENI
+
+// AssignedIPv4Addresses is the number of IP addresses already assigned
+func (p *ENIPool) AssignedIPv4Addresses() int {
+	count := 0
+	for _, eni := range *p {
+		count += eni.AssignedIPv4Addresses()
+	}
+	return count
+}
+
+// FindAddressForSandbox returns ENI and AddressInfo or (nil, nil) if not found
+func (p *ENIPool) FindAddressForSandbox(ipamKey IPAMKey) (*ENI, *CidrInfo, *AddressInfo) {
+	for _, eni := range *p {
+		if availableCidr, addr := eni.findAddressForSandbox(ipamKey); addr != nil && availableCidr != nil {
+			return eni, availableCidr, addr
+		}
+	}
+	return nil, nil, nil
+}
+
+// PodIPInfo contains pod's IP and the device number of the ENI
+type PodIPInfo struct {
+	IPAMKey IPAMKey
+	// IP is the IPv4 address of pod
+	IP string
+	// DeviceNumber is the device number of the ENI
+	DeviceNumber int
+}
+
+// ENIInfos contains ENI IP information
+type ENIInfos struct {
+	// TotalIPs is the total number of IP addresses
+	TotalIPs int
+	// assigned is the number of IP addresses that has been assigned
+	AssignedIPs int
+	// ENIs contains ENI IP pool information
+	ENIs map[string]ENI
+}
+
+// CheckpointFormatVersion is the version stamp used on stored checkpoints.
+const CheckpointFormatVersion = "vpc-cni-ipam/1"
+
+// CheckpointData is the format of stored checkpoints. Note this is
+// deliberately a "dumb" format since efficiency is less important
+// than version stability here.
+type CheckpointData struct {
+	Version     string            `json:"version"`
+	Allocations []CheckpointEntry `json:"allocations"`
+}
+
+// CheckpointEntry is a "row" in the conceptual IPAM datastore, as stored
+// in checkpoints.
+type CheckpointEntry struct {
+	IPAMKey
+	IPv4                string       `json:"ipv4,omitempty"`
+	IPv6                string       `json:"ipv6,omitempty"`
+	AllocationTimestamp int64        `json:"allocationTimestamp"`
+	Metadata            IPAMMetadata `json:"metadata"`
+}
+
+type DataStoreStats struct {
+	// Total number of addresses allocated
+	TotalIPs int
+	// Total number of prefixes allocated
+	TotalPrefixes int
+
+	// Number of assigned addresses
+	AssignedIPs int
+	// Number of addresses in cooldown
+	CooldownIPs int
+}
+
+func (stats *DataStoreStats) String() string {
+	return fmt.Sprintf("Total IPs/Prefixes = %d/%d, AssignedIPs/CooldownIPs: %d/%d",
+		stats.TotalIPs, stats.TotalPrefixes, stats.AssignedIPs, stats.CooldownIPs)
+}
+
+func (stats *DataStoreStats) AvailableAddresses() int {
+	return stats.TotalIPs - stats.AssignedIPs
+}