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generate.go
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generate.go
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package nginx
import (
"fmt"
"path/filepath"
"strings"
"github.com/ehazlett/interlock/ext"
"github.com/samalba/dockerclient"
)
func (p *NginxLoadBalancer) GenerateProxyConfig() (*Config, error) {
containers, err := p.client.ListContainers(false, false, "")
if err != nil {
return nil, err
}
var hosts []*Host
upstreamServers := map[string][]string{}
serverNames := map[string][]string{}
//hostBalanceAlgorithms := map[string]string{}
hostSSL := map[string]bool{}
hostSSLCert := map[string]string{}
hostSSLCertKey := map[string]string{}
hostSSLOnly := map[string]bool{}
hostSSLBackend := map[string]bool{}
hostWebsocketEndpoints := map[string][]string{}
for _, c := range containers {
cntId := c.Id[:12]
// load interlock data
cInfo, err := p.client.InspectContainer(cntId)
if err != nil {
return nil, err
}
hostname := cInfo.Config.Hostname
domain := cInfo.Config.Domainname
if v, ok := cInfo.Config.Labels[ext.InterlockHostnameLabel]; ok {
hostname = v
}
if v, ok := cInfo.Config.Labels[ext.InterlockDomainLabel]; ok {
domain = v
}
if domain == "" {
continue
}
if hostname != domain && hostname != "" {
domain = fmt.Sprintf("%s.%s", hostname, domain)
}
// check if the first server name is there; if not, add
// this happens if there are multiple backend containers
if _, ok := serverNames[domain]; !ok {
serverNames[domain] = []string{domain}
}
if _, ok := cInfo.Config.Labels[ext.InterlockSSLLabel]; ok {
hostSSL[domain] = true
}
hostSSLOnly[domain] = false
if _, ok := cInfo.Config.Labels[ext.InterlockSSLOnlyLabel]; ok {
log().Infof("configuring ssl redirect for %s", domain)
hostSSLOnly[domain] = true
}
// check ssl backend
hostSSLBackend[domain] = false
if _, ok := cInfo.Config.Labels[ext.InterlockSSLBackendLabel]; ok {
log().Debugf("configuring ssl backend for %s", domain)
hostSSLBackend[domain] = true
}
// set cert paths
baseCertPath := p.cfg.SSLCertPath
if v, ok := cInfo.Config.Labels[ext.InterlockSSLCertLabel]; ok {
certPath := filepath.Join(baseCertPath, v)
log().Infof("ssl cert for %s: %s", domain, certPath)
hostSSLCert[domain] = certPath
}
if v, ok := cInfo.Config.Labels[ext.InterlockSSLCertKeyLabel]; ok {
keyPath := filepath.Join(baseCertPath, v)
log().Infof("ssl key for %s: %s", domain, keyPath)
hostSSLCertKey[domain] = keyPath
}
ports := cInfo.NetworkSettings.Ports
if len(ports) == 0 {
log().Warnf("%s: no ports exposed", cntId)
continue
}
var portDef dockerclient.PortBinding
for _, v := range ports {
if len(v) > 0 {
portDef = dockerclient.PortBinding{
HostIp: v[0].HostIp,
HostPort: v[0].HostPort,
}
break
}
}
if p.cfg.BackendOverrideAddress != "" {
portDef.HostIp = p.cfg.BackendOverrideAddress
}
addr := fmt.Sprintf("%s:%s", portDef.HostIp, portDef.HostPort)
if v, ok := cInfo.Config.Labels[ext.InterlockPortLabel]; ok {
interlockPort := v
for k, x := range ports {
parts := strings.Split(k, "/")
if parts[0] == interlockPort {
port := x[0]
log().Debugf("%s: found specified port %s exposed as %s", domain, interlockPort, port.HostPort)
addr = fmt.Sprintf("%s:%s", portDef.HostIp, port.HostPort)
break
}
}
}
// "parse" multiple labels for websocket endpoints
websocketEndpoints := []string{}
for l, v := range cInfo.Config.Labels {
// this is for labels like interlock.websocket_endpoint.1=foo
if strings.Index(l, ext.InterlockWebsocketEndpointLabel) > -1 {
websocketEndpoints = append(websocketEndpoints, v)
}
}
log().Debugf("websocket endpoints: %v", websocketEndpoints)
// websocket endpoints
for _, ws := range websocketEndpoints {
hostWebsocketEndpoints[domain] = append(hostWebsocketEndpoints[domain], ws)
}
// "parse" multiple labels for alias domains
aliasDomains := []string{}
for l, v := range cInfo.Config.Labels {
// this is for labels like interlock.alias_domain.1=foo.local
if strings.Index(l, ext.InterlockAliasDomainLabel) > -1 {
aliasDomains = append(aliasDomains, v)
}
}
log().Debugf("alias domains: %v", aliasDomains)
for _, alias := range aliasDomains {
log().Debugf("adding alias %s for %s", alias, cntId)
serverNames[domain] = append(serverNames[domain], alias)
}
log().Infof("%s: upstream=%s", domain, addr)
upstreamServers[domain] = append(upstreamServers[domain], addr)
}
for k, v := range upstreamServers {
h := &Host{
ServerNames: serverNames[k],
Port: p.cfg.Port,
SSLPort: p.cfg.SSLPort,
SSL: hostSSL[k],
SSLCert: hostSSLCert[k],
SSLCertKey: hostSSLCertKey[k],
SSLOnly: hostSSLOnly[k],
SSLBackend: hostSSLBackend[k],
WebsocketEndpoints: hostWebsocketEndpoints[k],
}
servers := []*Server{}
for _, s := range v {
srv := &Server{
Addr: s,
}
servers = append(servers, srv)
}
up := &Upstream{
Name: k,
Servers: servers,
}
h.Upstream = up
hosts = append(hosts, h)
}
return &Config{
Hosts: hosts,
Config: p.cfg,
}, nil
}