/
connect.go
176 lines (148 loc) · 4.67 KB
/
connect.go
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package consul
import (
"fmt"
"github.com/hashicorp/consul/api"
"github.com/hashicorp/nomad/helper"
"github.com/hashicorp/nomad/nomad/structs"
)
// 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(serviceName string, nc *structs.ConsulConnect, networks structs.Networks) (*api.AgentServiceConnect, error) {
if nc == nil {
// no connect stanza means there is no connect service to register
return nil, nil
}
if nc.Native {
return &api.AgentServiceConnect{Native: true}, nil
}
sidecarReg, err := connectSidecarRegistration(serviceName, nc.SidecarService, networks)
if err != nil {
return nil, err
}
return &api.AgentServiceConnect{
Native: false,
SidecarService: sidecarReg,
}, nil
}
func connectSidecarRegistration(serviceName string, css *structs.ConsulSidecarService, networks structs.Networks) (*api.AgentServiceRegistration, error) {
if css == nil {
// no sidecar stanza means there is no sidecar service to register
return nil, nil
}
cNet, cPort, err := connectPort(serviceName, networks)
if err != nil {
return nil, err
}
proxy, err := connectProxy(css.Proxy, cPort.To, networks)
if err != nil {
return nil, err
}
return &api.AgentServiceRegistration{
Tags: helper.CopySliceString(css.Tags),
Port: cPort.Value,
Address: cNet.IP,
Proxy: proxy,
}, nil
}
func connectProxy(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),
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,
LocalBindPort: upstream.LocalBindPort,
}
}
return upstreams
}
func connectProxyConfig(cfg map[string]interface{}, port int) map[string]interface{} {
if cfg == nil {
cfg = make(map[string]interface{})
}
cfg["bind_address"] = "0.0.0.0"
cfg["bind_port"] = port
return cfg
}
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(serviceName string, networks structs.Networks) (*structs.NetworkResource, structs.Port, error) {
if err := connectNetworkInvariants(networks); err != nil {
return nil, structs.Port{}, err
}
port, ok := networks[0].PortForService(serviceName)
if !ok {
return nil, structs.Port{}, fmt.Errorf("No Connect port defined for service %q", serviceName)
}
return networks[0], port, 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
}
ip, port := networks.Port(portLabel)
if port == 0 {
return "", 0, fmt.Errorf("No port of label %q defined", portLabel)
}
return ip, port, nil
}