diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..e6c00fa --- /dev/null +++ b/go.mod @@ -0,0 +1,11 @@ +module scm.yoorie.de/go-lib/micro + +go 1.16 + +require ( + github.com/go-chi/chi v1.5.4 + github.com/go-chi/cors v1.2.0 + github.com/go-chi/render v1.0.1 + scm.yoorie.de/go-lib/certs v0.0.1 + scm.yoorie.de/go-lib/gelf v0.0.1 +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..b134d9a --- /dev/null +++ b/go.sum @@ -0,0 +1,134 @@ +github.com/aphistic/sweet v0.3.0 h1:xZTMfCoMsjWubPNxOBODluBC4qfGP0CdRJ88jon46XE= +github.com/aphistic/sweet v0.3.0/go.mod h1:fWDlIh/isSE9n6EPsRmC0det+whmX6dJid3stzu0Xys= +github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI= +github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI= +github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU= +github.com/davecgh/go-spew v1.1.0/go.mod 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h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= +gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY= +gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ= +gotest.tools v2.2.0+incompatible h1:VsBPFP1AI068pPrMxtb/S8Zkgf9xEmTLJjfM+P5UIEo= +gotest.tools v2.2.0+incompatible/go.mod h1:DsYFclhRJ6vuDpmuTbkuFWG+y2sxOXAzmJt81HFBacw= +scm.yoorie.de/go-lib/certs v0.0.1 h1:4FwWaIjtMQbhpr75kVD7Ymvz5fwpeM5kt1jrjrIHFsg= +scm.yoorie.de/go-lib/certs v0.0.1/go.mod h1:CYe8HvRaply1NRTQ9YnllvdijoZwNR4yXGhrN1L9BhM= +scm.yoorie.de/go-lib/gelf v0.0.1 h1:VcCUihF1zyOiDfPg2NWLyaBoJjundua624RBAPJx/vU= +scm.yoorie.de/go-lib/gelf v0.0.1/go.mod h1:p4HaHQX4mcgclzYB8nomFHvYLLdz64yr7MYlV5+Oz/I= diff --git a/web/health.go b/web/health.go new file mode 100644 index 0000000..0850cfd --- /dev/null +++ b/web/health.go @@ -0,0 +1,105 @@ +package web + +import ( + "fmt" + "net/http" + "time" + + "github.com/go-chi/chi" + log "scm.yoorie.de/go-lib/gelf" +) + +/* +healthChecker Class +*/ +type healthChecker struct { + message string + healthy bool + lastChecked time.Time + period int + ticker *time.Ticker + done chan bool + //This is the healtchcheck you will have to provide. + checkFunc func() (bool, string) +} + +func newHealthChecker(checkFunction func() (bool, string)) *healthChecker { + hc := &healthChecker{} + hc.checkFunc = checkFunction + return hc +} + +func (h *healthChecker) start(checkPeriodInSeconds int) { + h.period = checkPeriodInSeconds + h.message = "service starting" + h.healthy = false + h.doCheck() + h.ticker = time.NewTicker(time.Second * time.Duration(h.period)) + h.done = make(chan bool) + go func() { + for { + select { + case <-h.done: + return + case <-h.ticker.C: + h.doCheck() + } + } + }() +} + +func (h *healthChecker) stop() { + h.ticker.Stop() + h.done <- true + log.Debug("Health checker stopped.") +} + +//internal function to process the health check +func (h *healthChecker) doCheck() { + var msg string + h.healthy, msg = h.checkFunc() + if !h.healthy { + h.message = msg + } else { + h.message = "" + } + h.lastChecked = time.Now() +} + +// Routes add routes for liveness and readyness probes +func (h *healthChecker) Routes() *chi.Mux { + router := chi.NewRouter() + router.Get("/healthz", h.healthyEndpoint) + router.Get("/readyz", h.readinessEndpoint) + return router +} + +/* +GetHealthyEndpoint is this service healthy +*/ +func (h *healthChecker) healthyEndpoint(response http.ResponseWriter, req *http.Request) { + t := time.Now() + if t.Sub(h.lastChecked) > (time.Second * time.Duration(2*h.period)) { + h.healthy = false + h.message = "Healthcheck not running" + } + response.Header().Add("Content-Type", "application/json") + if h.healthy { + response.WriteHeader(http.StatusOK) + message := fmt.Sprintf(`{ "message": "service up and running", "lastCheck": "%s" }`, h.lastChecked.String()) + response.Write([]byte(message)) + } else { + response.WriteHeader(http.StatusServiceUnavailable) + message := fmt.Sprintf(`{ "message": "service is unavailable: %s", "lastCheck": "%s" }`, h.message, h.lastChecked.String()) + response.Write([]byte(message)) + } +} + +/* +GetReadinessEndpoint is this service ready for taking requests +*/ +func (h *healthChecker) readinessEndpoint(response http.ResponseWriter, req *http.Request) { + response.Header().Add("Content-Type", "application/json") + response.WriteHeader(http.StatusOK) + response.Write([]byte(`{ "message": "service started" }`)) +} diff --git a/web/server.go b/web/server.go new file mode 100644 index 0000000..f05663b --- /dev/null +++ b/web/server.go @@ -0,0 +1,275 @@ +package web + +import ( + "compress/flate" + "context" + "crypto/tls" + "fmt" + "net/http" + "os" + "os/signal" + "strconv" + "time" + + "github.com/go-chi/chi" + "github.com/go-chi/chi/middleware" + "github.com/go-chi/cors" + "github.com/go-chi/render" + "scm.yoorie.de/go-lib/certs" + log "scm.yoorie.de/go-lib/gelf" +) + +type WebServerConfiguration struct { + Host string `yaml:"host"` + Port int `yaml:"port"` + SslPort int `yaml:"sslport"` + SslCert string `yaml:"sslcert"` + SslKey string `yaml:"sslkey"` + HealthCheckPeriod int `yaml:"healthcheckperiod"` + CertificateGenerationParams TLSCertificateGenerationParams `yaml:"tlsgenerationparams"` +} + +type TLSCertificateGenerationParams struct { + Organization string `default:"acme.com" yaml:"organization"` + Host string `default:"localhost" yaml:"host"` + ValidForDays time.Duration `default:"3650" yaml:"validfor"` // Value in days +} + +type WebServer struct { + serviceConfig *WebServerConfiguration + sslsrv *http.Server + srv *http.Server + ssl bool + healthChecker *healthChecker + router *chi.Mux + healthRouter *chi.Mux + mounts map[string]http.Handler + HealthCheck func() (bool, string) +} + +func (server *WebServer) healthRoutes() *chi.Mux { + compressor := middleware.NewCompressor(flate.DefaultCompression) + router := chi.NewRouter() + router.Use( + render.SetContentType(render.ContentTypeJSON), + compressor.Handler, + middleware.Recoverer, + ) + router.Mount("/", server.healthChecker.Routes()) + return router +} + +func (server *WebServer) Mount(pattern string, handler http.Handler) { + server.mounts[pattern] = handler +} + +func (server *WebServer) routes() *chi.Mux { + compressor := middleware.NewCompressor(flate.DefaultCompression) + router := chi.NewRouter() + router.Use( + compressor.Handler, + middleware.Recoverer, + cors.Handler(cors.Options{ + AllowedOrigins: []string{"https://*", "http://*"}, + AllowedMethods: []string{"GET", "POST", "PUT", "DELETE", "OPTIONS"}, + AllowedHeaders: []string{"Accept", "Authorization", "Content-Type", "X-CSRF-Token"}, + ExposedHeaders: []string{"Link"}, + AllowCredentials: false, + MaxAge: 300, // Maximum value not ignored by any of major browsers + }), + ) + router.Mount("/health", server.healthRoutes()) + // Custom routes + for pattern, handler := range server.mounts { + router.Mount(pattern, handler) + } + return router +} + +func (server *WebServer) getTLSConfig() (*tls.Config, error) { + cert := server.serviceConfig.SslCert + key := server.serviceConfig.SslKey + if cert != "" && key != "" { + log.Infof("Loading SSL certificate %s %s", cert, key) + cer, err := tls.LoadX509KeyPair(cert, key) + if err != nil { + return nil, fmt.Errorf("Cannot load SSL certificat: %v", err) + } + return &tls.Config{Certificates: []tls.Certificate{cer}}, nil + } + log.Info("Generating SSL certificate") + + params := server.serviceConfig.CertificateGenerationParams + + gc := certs.GenerateCertificate{ + Organization: params.Organization, + Host: params.Host, + ValidFor: params.ValidForDays * 24 * time.Hour, + IsCA: false, + EcdsaCurve: "P256", + Ed25519Key: true, + } + return gc.GenerateTLSConfig() +} + +func (server *WebServer) DebugRoutes(routerName string, router *chi.Mux) { + walkFunc := func(method string, route string, handler http.Handler, middlewares ...func(http.Handler) http.Handler) error { + log.Infof("%s %s", method, route) + return nil + } + log.Infof("Routes of scope %s \n", routerName) + if err := chi.Walk(router, walkFunc); err != nil { + log.Alertf("Logging err: %s", err.Error()) + } +} + +// BuildHostAddress Builds a host address from configuration +func (c *WebServerConfiguration) BuildHostAddress(ssl bool) string { + var address string + if "" == c.Host { + address += "0.0.0.0" + } else { + address += c.Host + } + address += ":" + if ssl { + address += strconv.Itoa(c.SslPort) + } else { + address += strconv.Itoa(c.Port) + } + return address +} + +func (c *WebServerConfiguration) GetBindings() string { + + bindingStrings := "" + if c.SslPort > 0 { + bindingStrings += "https://" + c.BuildHostAddress(true) + "," + } + bindingStrings += "http://" + c.BuildHostAddress(false) + return bindingStrings +} + +func (server *WebServer) performHealthCheck() (bool, string) { + if server.HealthCheck != nil { + return server.HealthCheck() + } + return true, "" +} + +func (server *WebServer) Start(config *WebServerConfiguration) error { + server.serviceConfig = config + hc := newHealthChecker(server.performHealthCheck) + hc.start(config.HealthCheckPeriod) + + server.ssl = server.serviceConfig.SslPort > 0 + if server.ssl { + log.Debugf("Running in SSL mode") + } + + server.router = server.routes() + + server.healthRouter = server.healthRoutes() + server.DebugRoutes("Main", server.router) + server.DebugRoutes("Health", server.healthRouter) + if server.ssl { + err := server.setupSsl() + if err != nil { + return err + } + } else { + // own http server for the healthchecks + httpAddress := server.serviceConfig.BuildHostAddress(false) + server.srv = &http.Server{ + Addr: httpAddress, + WriteTimeout: time.Second * 15, + ReadTimeout: time.Second * 15, + IdleTimeout: time.Second * 60, + Handler: server.router, + } + go func() { + log.Infof("Starting http server on address: %s", server.srv.Addr) + if err := server.srv.ListenAndServe(); err != nil && err != http.ErrServerClosed { + log.Alertf("error starting server: %s", err.Error()) + } + }() + } + return nil +} + +func (server *WebServer) setupHttp() error { + // own http server for the healthchecks + httpAddress := server.serviceConfig.BuildHostAddress(false) + server.srv = &http.Server{ + Addr: httpAddress, + WriteTimeout: time.Second * 15, + ReadTimeout: time.Second * 15, + IdleTimeout: time.Second * 60, + Handler: server.router, + } + go func() { + log.Infof("Starting http server on address: %s", server.srv.Addr) + if err := server.srv.ListenAndServe(); err != nil && err != http.ErrServerClosed { + log.Alertf("error starting server: %s", err.Error()) + } + }() + return nil +} + +func (server *WebServer) setupSsl() error { + tlsConfig, err := server.getTLSConfig() + if err != nil { + return err + } + sslAddress := server.serviceConfig.BuildHostAddress(true) + + server.sslsrv = &http.Server{ + Addr: sslAddress, + WriteTimeout: time.Second * 15, + ReadTimeout: time.Second * 15, + IdleTimeout: time.Second * 60, + Handler: server.router, + TLSConfig: tlsConfig, + } + go func() { + log.Infof("Starting https server on address: %s", server.sslsrv.Addr) + if err := server.sslsrv.ListenAndServeTLS("", ""); err != nil && err != http.ErrServerClosed { + log.Alertf("error starting server: %s", err.Error()) + } + }() + httpAddress := server.serviceConfig.BuildHostAddress(false) + server.srv = &http.Server{ + Addr: httpAddress, + WriteTimeout: time.Second * 15, + ReadTimeout: time.Second * 15, + IdleTimeout: time.Second * 60, + Handler: server.healthRouter, + } + go func() { + log.Infof("Starting http server on address: %s", server.srv.Addr) + if err := server.srv.ListenAndServe(); err != nil && err != http.ErrServerClosed { + log.Alertf("error starting server: %s", err.Error()) + } + }() + return nil +} + +func (server *WebServer) Join() { + c := make(chan os.Signal, 1) + signal.Notify(c, os.Interrupt) + <-c +} + +func (server *WebServer) Stop() { + server.healthChecker.stop() + log.Info("Waiting for clients ...") + ctx, cancel := context.WithTimeout(context.Background(), time.Second*15) + defer cancel() + + log.Info("Shutting down server ...") + server.srv.Shutdown(ctx) + if server.ssl { + server.sslsrv.Shutdown(ctx) + } + log.Info("Server has been shutted down") +}