Use nginx upstreams and reload only if configuration changes

controllers/nginx-third-party/nginx/nginx.go

@@ -0,0 +1,92 @@
+package nginx
+
+// NGINXController Updates NGINX configuration, starts and reloads NGINX
+type NGINXController struct {
+	resolver       string
+	nginxConfdPath string
+	nginxCertsPath string
+	local          bool
+}
+
+// IngressNGINXConfig describes an NGINX configuration
+type IngressNGINXConfig struct {
+	Upstreams []Upstream
+	Servers   []Server
+}
+
+// Upstream describes an NGINX upstream
+type Upstream struct {
+	Name     string
+	Backends []UpstreamServer
+}
+
+type UpstreamByNameServers []Upstream
+
+func (c UpstreamByNameServers) Len() int      { return len(c) }
+func (c UpstreamByNameServers) Swap(i, j int) { c[i], c[j] = c[j], c[i] }
+func (c UpstreamByNameServers) Less(i, j int) bool {
+	return c[i].Name < c[j].Name
+}
+
+// UpstreamServer describes a server in an NGINX upstream
+type UpstreamServer struct {
+	Address string
+	Port    string
+}
+
+type UpstreamServerByAddrPort []UpstreamServer
+
+func (c UpstreamServerByAddrPort) Len() int      { return len(c) }
+func (c UpstreamServerByAddrPort) Swap(i, j int) { c[i], c[j] = c[j], c[i] }
+func (c UpstreamServerByAddrPort) Less(i, j int) bool {
+	iName := c[i].Address
+	jName := c[j].Address
+	if iName != jName {
+		return iName < jName
+	}
+
+	iU := c[i].Port
+	jU := c[j].Port
+	return iU < jU
+}
+
+// Server describes an NGINX server
+type Server struct {
+	Name              string
+	Locations         []Location
+	SSL               bool
+	SSLCertificate    string
+	SSLCertificateKey string
+}
+
+type ServerByNamePort []Server
+
+func (c ServerByNamePort) Len() int      { return len(c) }
+func (c ServerByNamePort) Swap(i, j int) { c[i], c[j] = c[j], c[i] }
+func (c ServerByNamePort) Less(i, j int) bool {
+	return c[i].Name < c[j].Name
+}
+
+// Location describes an NGINX location
+type Location struct {
+	Path     string
+	Upstream Upstream
+}
+
+type locByPathUpstream []Location
+
+func (c locByPathUpstream) Len() int      { return len(c) }
+func (c locByPathUpstream) Swap(i, j int) { c[i], c[j] = c[j], c[i] }
+func (c locByPathUpstream) Less(i, j int) bool {
+	return c[i].Path < c[j].Path
+}
+
+// NewUpstreamWithDefaultServer creates an upstream with the default server.
+// proxy_pass to an upstream with the default server returns 502.
+// We use it for services that have no endpoints
+func NewUpstreamWithDefaultServer(name string) Upstream {
+	return Upstream{
+		Name:     name,
+		Backends: []UpstreamServer{UpstreamServer{Address: "127.0.0.1", Port: "8181"}},
+	}
+}