|
| 1 | +package pipeline |
| 2 | + |
| 3 | +import ( |
| 4 | + "context" |
| 5 | + "fmt" |
| 6 | + "net/netip" |
| 7 | + "sync" |
| 8 | + "time" |
| 9 | + |
| 10 | + kubepb "github.com/castai/kvisor/api/v1/kube" |
| 11 | + "github.com/castai/kvisor/pkg/logging" |
| 12 | +) |
| 13 | + |
| 14 | +const ( |
| 15 | + maxRetries = 10 |
| 16 | + initialBackoff = 2 * time.Second |
| 17 | + maxBackoff = 1 * time.Minute |
| 18 | +) |
| 19 | + |
| 20 | +type clusterInfo struct { |
| 21 | + mu sync.RWMutex |
| 22 | + kubeClient kubepb.KubeAPIClient |
| 23 | + log *logging.Logger |
| 24 | + podCidr []netip.Prefix |
| 25 | + serviceCidr []netip.Prefix |
| 26 | + nodeCidr []netip.Prefix |
| 27 | + vpcCidr []netip.Prefix |
| 28 | + cloudCidr []netip.Prefix |
| 29 | + clusterCidr []netip.Prefix |
| 30 | +} |
| 31 | + |
| 32 | +func (c *Controller) runClusterInfoPipeline(ctx context.Context) { |
| 33 | + c.clusterInfo = newClusterInfo(c.kubeClient, c.log) |
| 34 | + |
| 35 | + clusterInfoCtx, clusterInfoCancel := context.WithTimeout(ctx, maxBackoff) |
| 36 | + defer clusterInfoCancel() |
| 37 | + |
| 38 | + // initial sync of cluster CIDRs info |
| 39 | + if err := c.clusterInfo.sync(clusterInfoCtx); err != nil { |
| 40 | + c.log.Errorf("syncing cluster info: %v", err) |
| 41 | + } |
| 42 | + |
| 43 | + // Start periodic refresh if interval is configured |
| 44 | + // this is needed to keep cluster CIDRs up to date |
| 45 | + if c.cfg.Netflow.ClusterInfoRefreshInterval == 0 { |
| 46 | + return |
| 47 | + } |
| 48 | + |
| 49 | + ticker := time.NewTicker(c.cfg.Netflow.ClusterInfoRefreshInterval) |
| 50 | + defer ticker.Stop() |
| 51 | + |
| 52 | + c.log.Infof("starting cluster info refresh with interval %s", c.cfg.Netflow.ClusterInfoRefreshInterval) |
| 53 | + |
| 54 | + for { |
| 55 | + select { |
| 56 | + case <-ctx.Done(): |
| 57 | + c.log.Info("stopping cluster info refresh") |
| 58 | + return |
| 59 | + case <-ticker.C: |
| 60 | + c.log.Debug("refreshing cluster info") |
| 61 | + |
| 62 | + clusterInfoCtx, clusterInfoCancel := context.WithTimeout(ctx, maxBackoff) |
| 63 | + defer clusterInfoCancel() |
| 64 | + |
| 65 | + if err := c.clusterInfo.sync(clusterInfoCtx); err != nil { |
| 66 | + c.log.Errorf("syncing cluster info failed: %v, retry in %s", err, c.cfg.Netflow.ClusterInfoRefreshInterval) |
| 67 | + } |
| 68 | + } |
| 69 | + } |
| 70 | +} |
| 71 | + |
| 72 | +func newClusterInfo(kubeClient kubepb.KubeAPIClient, log *logging.Logger) *clusterInfo { |
| 73 | + return &clusterInfo{ |
| 74 | + kubeClient: kubeClient, |
| 75 | + log: log, |
| 76 | + } |
| 77 | +} |
| 78 | + |
| 79 | +func (c *clusterInfo) sync(ctx context.Context) error { |
| 80 | + var resp *kubepb.GetClusterInfoResponse |
| 81 | + var err error |
| 82 | + |
| 83 | + backoff := initialBackoff |
| 84 | + for attempt := 1; attempt <= maxRetries; attempt++ { |
| 85 | + // There is no point to refersh cloud CIDRs as they are changed very infrequently |
| 86 | + resp, err = c.kubeClient.GetClusterInfo(ctx, &kubepb.GetClusterInfoRequest{ExcludeOtherCidr: len(c.cloudCidr) > 0}) |
| 87 | + if err == nil { |
| 88 | + break |
| 89 | + } |
| 90 | + |
| 91 | + if attempt < maxRetries { |
| 92 | + c.log.Warnf("getting cluster info (attempt %d/%d): %v, retrying in %v", attempt, maxRetries, err, backoff) |
| 93 | + |
| 94 | + select { |
| 95 | + case <-ctx.Done(): |
| 96 | + return fmt.Errorf("context cancelled during retry: %w", ctx.Err()) |
| 97 | + case <-time.After(backoff): |
| 98 | + backoff *= 2 |
| 99 | + if backoff > maxBackoff { |
| 100 | + backoff = maxBackoff |
| 101 | + } |
| 102 | + } |
| 103 | + } else { |
| 104 | + return fmt.Errorf("getting cluster info after %d attempts: %w", maxRetries, err) |
| 105 | + } |
| 106 | + } |
| 107 | + |
| 108 | + var podCidr, serviceCidr, nodeCidr, vpcCidr, cloudCidr, clusterCidr []netip.Prefix |
| 109 | + |
| 110 | + for _, cidr := range resp.GetPodsCidr() { |
| 111 | + subnet, err := netip.ParsePrefix(cidr) |
| 112 | + if err != nil { |
| 113 | + c.log.Errorf("parsing pods cidr: %v", err) |
| 114 | + continue |
| 115 | + } |
| 116 | + podCidr = append(podCidr, subnet) |
| 117 | + clusterCidr = append(clusterCidr, subnet) |
| 118 | + } |
| 119 | + for _, cidr := range resp.GetServiceCidr() { |
| 120 | + subnet, err := netip.ParsePrefix(cidr) |
| 121 | + if err != nil { |
| 122 | + c.log.Errorf("parsing service cidr: %v", err) |
| 123 | + continue |
| 124 | + } |
| 125 | + serviceCidr = append(serviceCidr, subnet) |
| 126 | + clusterCidr = append(clusterCidr, subnet) |
| 127 | + } |
| 128 | + for _, cidr := range resp.GetNodeCidr() { |
| 129 | + subnet, err := netip.ParsePrefix(cidr) |
| 130 | + if err != nil { |
| 131 | + c.log.Errorf("parsing node cidr: %v", err) |
| 132 | + continue |
| 133 | + } |
| 134 | + nodeCidr = append(nodeCidr, subnet) |
| 135 | + clusterCidr = append(clusterCidr, subnet) |
| 136 | + } |
| 137 | + for _, cidr := range resp.GetVpcCidr() { |
| 138 | + subnet, err := netip.ParsePrefix(cidr) |
| 139 | + if err != nil { |
| 140 | + c.log.Errorf("parsing vpc cidr: %v", err) |
| 141 | + continue |
| 142 | + } |
| 143 | + vpcCidr = append(vpcCidr, subnet) |
| 144 | + clusterCidr = append(clusterCidr, subnet) |
| 145 | + } |
| 146 | + for _, cidr := range resp.GetOtherCidr() { |
| 147 | + subnet, err := netip.ParsePrefix(cidr) |
| 148 | + if err != nil { |
| 149 | + c.log.Errorf("parsing other cidr: %v", err) |
| 150 | + continue |
| 151 | + } |
| 152 | + cloudCidr = append(cloudCidr, subnet) |
| 153 | + clusterCidr = append(clusterCidr, subnet) |
| 154 | + } |
| 155 | + |
| 156 | + c.mu.Lock() |
| 157 | + c.podCidr = podCidr |
| 158 | + c.serviceCidr = serviceCidr |
| 159 | + c.nodeCidr = nodeCidr |
| 160 | + c.vpcCidr = vpcCidr |
| 161 | + c.clusterCidr = clusterCidr |
| 162 | + if len(cloudCidr) > 0 { |
| 163 | + c.cloudCidr = cloudCidr |
| 164 | + } |
| 165 | + c.log.Infof( |
| 166 | + "fetched cluster info, pod_cidr=%s, service_cidr=%s, node_cidr=%s, vpc_cidr=%s, cloud_cidr_count=%d", |
| 167 | + c.podCidr, c.serviceCidr, c.nodeCidr, c.vpcCidr, len(c.cloudCidr), |
| 168 | + ) |
| 169 | + c.mu.Unlock() |
| 170 | + |
| 171 | + return nil |
| 172 | +} |
| 173 | + |
| 174 | +func (c *clusterInfo) cloudCidrContains(ip netip.Addr) bool { |
| 175 | + if c == nil { |
| 176 | + // happens when netflow-check-cluster-network-ranges=false |
| 177 | + return false |
| 178 | + } |
| 179 | + |
| 180 | + c.mu.RLock() |
| 181 | + defer c.mu.RUnlock() |
| 182 | + for _, cidr := range c.cloudCidr { |
| 183 | + if cidr.Contains(ip) { |
| 184 | + return true |
| 185 | + } |
| 186 | + } |
| 187 | + return false |
| 188 | +} |
| 189 | + |
| 190 | +func (c *clusterInfo) serviceCidrContains(ip netip.Addr) bool { |
| 191 | + if c == nil { |
| 192 | + // happens when netflow-check-cluster-network-ranges=false |
| 193 | + return false |
| 194 | + } |
| 195 | + |
| 196 | + c.mu.RLock() |
| 197 | + defer c.mu.RUnlock() |
| 198 | + for _, cidr := range c.serviceCidr { |
| 199 | + if cidr.Contains(ip) { |
| 200 | + return true |
| 201 | + } |
| 202 | + } |
| 203 | + return false |
| 204 | +} |
| 205 | + |
| 206 | +func (c *clusterInfo) clusterCidrContains(ip netip.Addr) bool { |
| 207 | + if c == nil { |
| 208 | + // happens when netflow-check-cluster-network-ranges=false |
| 209 | + return false |
| 210 | + } |
| 211 | + |
| 212 | + c.mu.RLock() |
| 213 | + defer c.mu.RUnlock() |
| 214 | + for _, cidr := range c.clusterCidr { |
| 215 | + if cidr.Contains(ip) { |
| 216 | + return true |
| 217 | + } |
| 218 | + } |
| 219 | + |
| 220 | + return false |
| 221 | +} |
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