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fake_ovs.go
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fake_ovs.go
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package ovs
import (
"fmt"
"sort"
"strings"
)
// ovsFake implements a fake ovs.Interface for testing purposes
//
// Note that the code here is *not* expected to be 100% equivalent to ovsExec, as
// that would require porting over huge amounts of ovs-ofctl source code. It needs
// to support enough features to make the SDN unit tests pass, and should do enough
// error checking to catch bugs that have tripped us up in the past (eg,
// specifying "nw_dst" without "ip").
type ovsPortInfo struct {
ofport int
externalIDs map[string]string
}
type ovsFake struct {
bridge string
ports map[string]ovsPortInfo
flows ovsFlows
}
// NewFake returns a new ovs.Interface
func NewFake(bridge string) Interface {
return &ovsFake{bridge: bridge}
}
func (fake *ovsFake) AddBridge(properties ...string) error {
fake.ports = make(map[string]ovsPortInfo)
fake.flows = make([]OvsFlow, 0)
return nil
}
func (fake *ovsFake) DeleteBridge(ifExists bool) error {
fake.ports = nil
fake.flows = nil
return nil
}
func (fake *ovsFake) ensureExists() error {
if fake.ports == nil {
return fmt.Errorf("no bridge named %s", fake.bridge)
}
return nil
}
func (fake *ovsFake) GetOFPort(port string) (int, error) {
if err := fake.ensureExists(); err != nil {
return -1, err
}
if portInfo, exists := fake.ports[port]; exists {
return portInfo.ofport, nil
} else {
return -1, fmt.Errorf("no row %q in table Interface", port)
}
}
func (fake *ovsFake) AddPort(port string, ofportRequest int, properties ...string) (int, error) {
if err := fake.ensureExists(); err != nil {
return -1, err
}
var externalIDs map[string]string
for _, property := range properties {
if !strings.HasPrefix(property, "external-ids=") {
continue
}
var err error
externalIDs, err = ParseExternalIDs(property[13:])
if err != nil {
return -1, err
}
}
portInfo, exists := fake.ports[port]
if exists {
if portInfo.ofport != ofportRequest && ofportRequest != -1 {
return -1, fmt.Errorf("allocated ofport (%d) did not match request (%d)", portInfo.ofport, ofportRequest)
}
} else {
if ofportRequest == -1 {
portInfo.ofport = 1
for _, existingPortInfo := range fake.ports {
if existingPortInfo.ofport >= portInfo.ofport {
portInfo.ofport = existingPortInfo.ofport + 1
}
}
} else {
if ofportRequest < 1 || ofportRequest > 65535 {
return -1, fmt.Errorf("requested ofport (%d) out of range", ofportRequest)
}
portInfo.ofport = ofportRequest
}
portInfo.externalIDs = externalIDs
fake.ports[port] = portInfo
}
return portInfo.ofport, nil
}
func (fake *ovsFake) DeletePort(port string) error {
if err := fake.ensureExists(); err != nil {
return err
}
delete(fake.ports, port)
return nil
}
func (fake *ovsFake) SetFrags(mode string) error {
return nil
}
func (ovsif *ovsFake) Create(table string, values ...string) (string, error) {
return "fake-UUID", nil
}
func (fake *ovsFake) Destroy(table, record string) error {
return nil
}
func (fake *ovsFake) Get(table, record, column string) (string, error) {
return "", nil
}
func (fake *ovsFake) Set(table, record string, values ...string) error {
return nil
}
func (fake *ovsFake) Find(table, column, condition string) ([]string, error) {
results := make([]string, 0)
if (table == "Interface" || table == "interface") && strings.HasPrefix(condition, "external-ids:") {
parsed := strings.Split(condition[13:], "=")
if len(parsed) != 2 {
return nil, fmt.Errorf("could not parse condition %q", condition)
}
for portName, portInfo := range fake.ports {
if portInfo.externalIDs[parsed[0]] == parsed[1] {
if column == "name" {
results = append(results, portName)
} else if column == "ofport" {
results = append(results, fmt.Sprintf("%d", portInfo.ofport))
} else if column == "external-ids" {
results = append(results, UnparseExternalIDs(portInfo.externalIDs))
}
}
}
}
return results, nil
}
func (fake *ovsFake) Clear(table, record string, columns ...string) error {
return nil
}
type ovsFakeTx struct {
fake *ovsFake
flows []string
}
func (fake *ovsFake) NewTransaction() Transaction {
return &ovsFakeTx{fake: fake, flows: []string{}}
}
// sort.Interface support
type ovsFlows []OvsFlow
func (f ovsFlows) Len() int { return len(f) }
func (f ovsFlows) Swap(i, j int) { f[i], f[j] = f[j], f[i] }
func (f ovsFlows) Less(i, j int) bool {
if f[i].Table != f[j].Table {
return f[i].Table < f[j].Table
}
if f[i].Priority != f[j].Priority {
return f[i].Priority > f[j].Priority
}
return f[i].Created.Before(f[j].Created)
}
func fixFlowFields(flow *OvsFlow) {
// Fix up field names to match what dump-flows prints. Some fields
// have aliases or deprecated names that can be used for add/del flows,
// but dump always reports the canonical name
if _, isArp := flow.FindField("arp"); isArp {
for i := range flow.Fields {
if flow.Fields[i].Name == "nw_src" {
flow.Fields[i].Name = "arp_spa"
} else if flow.Fields[i].Name == "nw_dst" {
flow.Fields[i].Name = "arp_tpa"
}
}
}
}
func (tx *ovsFakeTx) AddFlow(flow string, args ...interface{}) {
if len(args) > 0 {
flow = fmt.Sprintf(flow, args...)
}
tx.flows = append(tx.flows, fmt.Sprintf("add %s", flow))
}
func (fake *ovsFake) addFlowHelper(flow string) error {
parsed, err := ParseFlow(ParseForAdd, flow)
if err != nil {
return err
}
fixFlowFields(parsed)
// If there is already an exact match for this flow, then the new flow replaces it.
for i := range fake.flows {
if FlowMatches(&fake.flows[i], parsed) {
fake.flows[i] = *parsed
return nil
}
}
fake.flows = append(fake.flows, *parsed)
sort.Sort(ovsFlows(fake.flows))
return nil
}
func (tx *ovsFakeTx) DeleteFlows(flow string, args ...interface{}) {
if len(args) > 0 {
flow = fmt.Sprintf(flow, args...)
}
tx.flows = append(tx.flows, fmt.Sprintf("delete %s", flow))
}
func (fake *ovsFake) deleteFlowsHelper(flow string) error {
parsed, err := ParseFlow(ParseForFilter, flow)
if err != nil {
return err
}
fixFlowFields(parsed)
newFlows := make([]OvsFlow, 0, len(fake.flows))
for _, flow := range fake.flows {
if !FlowMatches(&flow, parsed) {
newFlows = append(newFlows, flow)
}
}
fake.flows = newFlows
return nil
}
func (tx *ovsFakeTx) Commit() error {
var err error
if err = tx.fake.ensureExists(); err != nil {
return err
}
oldFlows := make(ovsFlows, len(tx.fake.flows))
copy(oldFlows, tx.fake.flows)
for _, flow := range tx.flows {
if strings.HasPrefix(flow, "add") {
flow = strings.TrimLeft(flow, "add")
err = tx.fake.addFlowHelper(flow)
} else if strings.HasPrefix(flow, "delete") {
flow = strings.TrimLeft(flow, "delete")
err = tx.fake.deleteFlowsHelper(flow)
} else {
err = fmt.Errorf("invalid flow %q", flow)
}
if err != nil {
// Transaction failed, restore to old state
tx.fake.flows = oldFlows
break
}
}
// Reset flows
tx.flows = []string{}
return err
}
func (fake *ovsFake) DumpFlows(flow string, args ...interface{}) ([]string, error) {
if err := fake.ensureExists(); err != nil {
return nil, err
}
// "ParseForFilter", because "ParseForDump" is for the *results* of DumpFlows,
// not the input
filter, err := ParseFlow(ParseForFilter, flow, args...)
if err != nil {
return nil, err
}
fixFlowFields(filter)
flows := make([]string, 0, len(fake.flows))
for _, flow := range fake.flows {
if !FlowMatches(&flow, filter) {
continue
}
str := fmt.Sprintf(" cookie=%s, table=%d", flow.Cookie, flow.Table)
if flow.Priority != defaultPriority {
str += fmt.Sprintf(", priority=%d", flow.Priority)
}
for _, field := range flow.Fields {
if field.Value == "" {
str += fmt.Sprintf(", %s", field.Name)
} else {
str += fmt.Sprintf(", %s=%s", field.Name, field.Value)
}
}
actionStr := ""
for _, action := range flow.Actions {
if len(actionStr) > 0 {
actionStr += ","
}
actionStr += action.Name
if action.Value != "" {
if action.Value[0] != '(' {
actionStr += ":" + action.Value
} else {
actionStr += action.Value
}
}
}
if len(actionStr) > 0 {
str += fmt.Sprintf(", actions=%s", actionStr)
}
flows = append(flows, str)
}
return flows, nil
}