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planner.go
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planner.go
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package planner
import (
"lib/datastore"
"lib/models"
"lib/rules"
"sort"
"time"
"vxlan-policy-agent/enforcer"
"code.cloudfoundry.org/lager"
)
//go:generate counterfeiter -o fakes/policy_client.go --fake-name PolicyClient . policyClient
type policyClient interface {
GetPoliciesByID(ids ...string) ([]models.Policy, error)
}
//go:generate counterfeiter -o fakes/dstore.go --fake-name Dstore . dstore
type dstore interface {
ReadAll() (map[string]datastore.Container, error)
}
//go:generate counterfeiter -o fakes/metrics_sender.go --fake-name MetricsSender . metricsSender
type metricsSender interface {
SendDuration(string, time.Duration)
}
type VxlanPolicyPlanner struct {
Logger lager.Logger
Datastore dstore
PolicyClient policyClient
VNI int
MetricsSender metricsSender
Chain enforcer.Chain
LoggingState loggingStateGetter
}
type Container struct {
Handle string
IP string
GroupID string
}
const metricContainerMetadata = "containerMetadataTime"
const metricPolicyServerPoll = "policyServerPollTime"
func (p *VxlanPolicyPlanner) getContainersMap(allContainers map[string]datastore.Container) (map[string][]string, error) {
containers := map[string][]string{}
for _, container := range allContainers {
if container.Metadata == nil {
continue
}
groupID, ok := container.Metadata["policy_group_id"].(string)
if !ok {
message := "Container metadata is missing key policy_group_id. CloudController version may be out of date or apps may need to be restaged."
p.Logger.Debug("container-metadata-policy-group-id", lager.Data{"container_handle": container.Handle, "message": message})
continue
}
containers[groupID] = append(containers[groupID], container.IP)
}
return containers, nil
}
func (p *VxlanPolicyPlanner) GetRulesAndChain() (enforcer.RulesWithChain, error) {
containerMetadataStartTime := time.Now()
containerMetadata, err := p.Datastore.ReadAll()
if err != nil {
p.Logger.Error("datastore", err)
return enforcer.RulesWithChain{}, err
}
containers, err := p.getContainersMap(containerMetadata)
groupIDs := make([]string, len(containers))
i := 0
for groupID := range containers {
groupIDs[i] = groupID
i++
}
if err != nil {
p.Logger.Error("container-info", err)
return enforcer.RulesWithChain{}, err
}
containerMetadataDuration := time.Now().Sub(containerMetadataStartTime)
p.Logger.Debug("got-containers", lager.Data{"containers": containers})
policyServerStartRequestTime := time.Now()
var policies []models.Policy
if len(groupIDs) > 0 {
policies, err = p.PolicyClient.GetPoliciesByID(groupIDs...)
if err != nil {
p.Logger.Error("policy-client-get-policies", err)
return enforcer.RulesWithChain{}, err
}
}
policyServerPollDuration := time.Now().Sub(policyServerStartRequestTime)
p.MetricsSender.SendDuration(metricContainerMetadata, containerMetadataDuration)
p.MetricsSender.SendDuration(metricPolicyServerPoll, policyServerPollDuration)
marksRuleset := []rules.IPTablesRule{}
markedSourceIPs := make(map[string]struct{})
filterRuleset := []rules.IPTablesRule{}
iptablesLoggingEnabled := p.LoggingState.IsEnabled()
policySlice := models.PolicySlice(policies)
sort.Sort(policySlice)
for _, policy := range policySlice {
srcContainerIPs, srcOk := containers[policy.Source.ID]
dstContainerIPs, dstOk := containers[policy.Destination.ID]
if dstOk {
// there are some containers on this host that are dests for the policy
ips := sort.StringSlice(dstContainerIPs)
sort.Sort(ips)
for _, dstContainerIP := range ips {
if iptablesLoggingEnabled {
filterRuleset = append(
filterRuleset,
rules.NewMarkLogRule(
dstContainerIP,
policy.Destination.Protocol,
policy.Destination.Port,
policy.Source.Tag,
policy.Destination.ID,
),
)
}
filterRuleset = append(
filterRuleset,
rules.NewMarkAllowRule(
dstContainerIP,
policy.Destination.Protocol,
policy.Destination.Port,
policy.Source.Tag,
policy.Source.ID,
policy.Destination.ID,
),
)
}
}
if srcOk {
// there are some containers on this host that are sources for the policy
ips := sort.StringSlice(srcContainerIPs)
sort.Sort(ips)
for _, srcContainerIP := range ips {
_, added := markedSourceIPs[srcContainerIP]
if !added {
rule := rules.NewMarkSetRule(srcContainerIP, policy.Source.Tag, policy.Source.ID)
marksRuleset = append(marksRuleset, rule)
markedSourceIPs[srcContainerIP] = struct{}{}
}
}
}
}
ruleset := append(marksRuleset, filterRuleset...)
p.Logger.Debug("generated-rules", lager.Data{"rules": ruleset})
return enforcer.RulesWithChain{
Chain: p.Chain,
Rules: ruleset,
}, nil
}