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connect.go
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connect.go
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package consul
import (
"fmt"
"net"
"sort"
"strconv"
"strings"
"github.com/hashicorp/consul/api"
"github.com/hashicorp/nomad/nomad/structs"
"golang.org/x/exp/slices"
)
// newConnect creates a new Consul AgentServiceConnect struct based on a Nomad
// Connect struct. If the nomad Connect struct is nil, nil will be returned to
// disable Connect for this service.
func newConnect(serviceID string, info structs.AllocInfo, serviceName string, nc *structs.ConsulConnect, networks structs.Networks, ports structs.AllocatedPorts) (*api.AgentServiceConnect, error) {
switch {
case nc == nil:
// no connect stanza means there is no connect service to register
return nil, nil
case nc.IsGateway():
// gateway settings are configured on the service block on the consul side
return nil, nil
case nc.IsNative():
// the service is connect native
return &api.AgentServiceConnect{Native: true}, nil
case nc.HasSidecar():
// must register the sidecar for this service
if nc.SidecarService.Port == "" {
nc.SidecarService.Port = fmt.Sprintf("%s-%s", structs.ConnectProxyPrefix, serviceName)
}
sidecarReg, err := connectSidecarRegistration(serviceID, info, nc.SidecarService, networks, ports)
if err != nil {
return nil, err
}
return &api.AgentServiceConnect{SidecarService: sidecarReg}, nil
default:
// a non-nil but empty connect block makes no sense
return nil, fmt.Errorf("Connect configuration empty for service %s", serviceName)
}
}
// newConnectGateway creates a new Consul AgentServiceConnectProxyConfig struct based on
// a Nomad Connect struct. If the Nomad Connect struct does not contain a gateway, nil
// will be returned as this service is not a gateway.
func newConnectGateway(connect *structs.ConsulConnect) *api.AgentServiceConnectProxyConfig {
if !connect.IsGateway() {
return nil
}
var envoyConfig map[string]interface{}
// Populate the envoy configuration from the gateway.proxy stanza, if
// such configuration is provided.
if proxy := connect.Gateway.Proxy; proxy != nil {
envoyConfig = make(map[string]interface{})
if len(proxy.EnvoyGatewayBindAddresses) > 0 {
envoyConfig["envoy_gateway_bind_addresses"] = proxy.EnvoyGatewayBindAddresses
}
if proxy.EnvoyGatewayNoDefaultBind {
envoyConfig["envoy_gateway_no_default_bind"] = true
}
if proxy.EnvoyGatewayBindTaggedAddresses {
envoyConfig["envoy_gateway_bind_tagged_addresses"] = true
}
if proxy.EnvoyDNSDiscoveryType != "" {
envoyConfig["envoy_dns_discovery_type"] = proxy.EnvoyDNSDiscoveryType
}
if proxy.ConnectTimeout != nil {
envoyConfig["connect_timeout_ms"] = proxy.ConnectTimeout.Milliseconds()
}
if len(proxy.Config) > 0 {
for k, v := range proxy.Config {
envoyConfig[k] = v
}
}
}
return &api.AgentServiceConnectProxyConfig{Config: envoyConfig}
}
func connectSidecarRegistration(serviceID string, info structs.AllocInfo, css *structs.ConsulSidecarService, networks structs.Networks, ports structs.AllocatedPorts) (*api.AgentServiceRegistration, error) {
if css == nil {
// no sidecar stanza means there is no sidecar service to register
return nil, nil
}
cMapping, err := connectPort(css.Port, networks, ports)
if err != nil {
return nil, err
}
proxy, err := connectSidecarProxy(info, css.Proxy, cMapping.To, networks)
if err != nil {
return nil, err
}
// if the service has a TCP check that's failing, we need an alias to
// ensure service discovery excludes this sidecar from queries
// (ex. in the case of Connect upstreams)
checks := api.AgentServiceChecks{{
Name: "Connect Sidecar Aliasing " + serviceID,
AliasService: serviceID,
}}
if !css.DisableDefaultTCPCheck {
checks = append(checks, &api.AgentServiceCheck{
Name: "Connect Sidecar Listening",
TCP: net.JoinHostPort(cMapping.HostIP, strconv.Itoa(cMapping.Value)),
Interval: "10s",
})
}
return &api.AgentServiceRegistration{
Tags: slices.Clone(css.Tags),
Port: cMapping.Value,
Address: cMapping.HostIP,
Proxy: proxy,
Checks: checks,
}, nil
}
func connectSidecarProxy(info structs.AllocInfo, proxy *structs.ConsulProxy, cPort int, networks structs.Networks) (*api.AgentServiceConnectProxyConfig, error) {
if proxy == nil {
proxy = new(structs.ConsulProxy)
}
expose, err := connectProxyExpose(proxy.Expose, networks)
if err != nil {
return nil, err
}
return &api.AgentServiceConnectProxyConfig{
LocalServiceAddress: proxy.LocalServiceAddress,
LocalServicePort: proxy.LocalServicePort,
Config: connectProxyConfig(proxy.Config, cPort, info),
Upstreams: connectUpstreams(proxy.Upstreams),
Expose: expose,
}, nil
}
func connectProxyExpose(expose *structs.ConsulExposeConfig, networks structs.Networks) (api.ExposeConfig, error) {
if expose == nil {
return api.ExposeConfig{}, nil
}
paths, err := connectProxyExposePaths(expose.Paths, networks)
if err != nil {
return api.ExposeConfig{}, err
}
return api.ExposeConfig{
Checks: false,
Paths: paths,
}, nil
}
func connectProxyExposePaths(in []structs.ConsulExposePath, networks structs.Networks) ([]api.ExposePath, error) {
if len(in) == 0 {
return nil, nil
}
paths := make([]api.ExposePath, len(in))
for i, path := range in {
if _, exposedPort, err := connectExposePathPort(path.ListenerPort, networks); err != nil {
return nil, err
} else {
paths[i] = api.ExposePath{
ListenerPort: exposedPort,
Path: path.Path,
LocalPathPort: path.LocalPathPort,
Protocol: path.Protocol,
ParsedFromCheck: false,
}
}
}
return paths, nil
}
func connectUpstreams(in []structs.ConsulUpstream) []api.Upstream {
if len(in) == 0 {
return nil
}
upstreams := make([]api.Upstream, len(in))
for i, upstream := range in {
upstreams[i] = api.Upstream{
DestinationName: upstream.DestinationName,
DestinationNamespace: upstream.DestinationNamespace,
LocalBindPort: upstream.LocalBindPort,
Datacenter: upstream.Datacenter,
LocalBindAddress: upstream.LocalBindAddress,
MeshGateway: connectMeshGateway(upstream.MeshGateway),
}
}
return upstreams
}
// connectMeshGateway creates an api.MeshGatewayConfig from the nomad upstream
// block. A non-existent config or unsupported gateway mode will default to the
// Consul default mode.
func connectMeshGateway(in structs.ConsulMeshGateway) api.MeshGatewayConfig {
gw := api.MeshGatewayConfig{
Mode: api.MeshGatewayModeDefault,
}
switch in.Mode {
case "local":
gw.Mode = api.MeshGatewayModeLocal
case "remote":
gw.Mode = api.MeshGatewayModeRemote
case "none":
gw.Mode = api.MeshGatewayModeNone
}
return gw
}
func connectProxyConfig(cfg map[string]interface{}, port int, info structs.AllocInfo) map[string]interface{} {
if cfg == nil {
cfg = make(map[string]interface{})
}
cfg["bind_address"] = "0.0.0.0"
cfg["bind_port"] = port
tags := map[string]string{
"nomad.group=": info.Group,
"nomad.job=": info.JobID,
"nomad.namespace=": info.Namespace,
"nomad.alloc_id=": info.AllocID,
}
injectNomadInfo(cfg, tags)
return cfg
}
// injectNomadInfo merges nomad information into cfg=>envoy_stats_tags
//
// cfg must not be nil
func injectNomadInfo(cfg map[string]interface{}, defaultTags map[string]string) {
const configKey = "envoy_stats_tags"
existingTagsI := cfg[configKey]
switch existingTags := existingTagsI.(type) {
case []string:
if len(existingTags) == 0 {
break
}
OUTER:
for key, value := range defaultTags {
for _, tag := range existingTags {
if strings.HasPrefix(tag, key) {
continue OUTER
}
}
existingTags = append(existingTags, key+value)
}
cfg[configKey] = existingTags
return
}
// common case.
var tags []string
for key, value := range defaultTags {
if value == "" {
continue
}
tag := key + value
tags = append(tags, tag)
}
sort.Strings(tags) // mostly for test stability
cfg[configKey] = tags
}
func connectNetworkInvariants(networks structs.Networks) error {
if n := len(networks); n != 1 {
return fmt.Errorf("Connect only supported with exactly 1 network (found %d)", n)
}
return nil
}
// connectPort returns the network and port for the Connect proxy sidecar
// defined for this service. An error is returned if the network and port
// cannot be determined.
func connectPort(portLabel string, networks structs.Networks, ports structs.AllocatedPorts) (structs.AllocatedPortMapping, error) {
if err := connectNetworkInvariants(networks); err != nil {
return structs.AllocatedPortMapping{}, err
}
mapping, ok := ports.Get(portLabel)
if !ok {
mapping = networks.Port(portLabel)
if mapping.Value > 0 {
return mapping, nil
}
return structs.AllocatedPortMapping{}, fmt.Errorf("No port of label %q defined", portLabel)
}
return mapping, nil
}
// connectExposePathPort returns the port for the exposed path for the exposed
// proxy path.
func connectExposePathPort(portLabel string, networks structs.Networks) (string, int, error) {
if err := connectNetworkInvariants(networks); err != nil {
return "", 0, err
}
mapping := networks.Port(portLabel)
if mapping.Value == 0 {
return "", 0, fmt.Errorf("No port of label %q defined", portLabel)
}
return mapping.HostIP, mapping.Value, nil
}