From a4c2aba14bb18ff869a1d7dfa5f098a09e9d1fee Mon Sep 17 00:00:00 2001 From: Piotr Biernat Date: Thu, 1 Dec 2022 04:05:41 +0100 Subject: [PATCH] Initial content --- go.mod | 28 +++++++ go.sum | 167 ++++++++++++++++++++++++++++++++++++++++ src/amqp/connect.go | 26 +++++++ src/amqp/queue.go | 85 ++++++++++++++++++++ src/consul/discovery.go | 129 +++++++++++++++++++++++++++++++ src/fluentd/config.go | 14 ++++ src/fluentd/logger.go | 41 ++++++++++ 7 files changed, 490 insertions(+) create mode 100644 go.mod create mode 100644 go.sum create mode 100644 src/amqp/connect.go create mode 100644 src/amqp/queue.go create mode 100644 src/consul/discovery.go create mode 100644 src/fluentd/config.go create mode 100644 src/fluentd/logger.go diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..1c7ce9a --- /dev/null +++ b/go.mod @@ -0,0 +1,28 @@ +module git.pbiernat.dev/egommerce/go-api-pkg + +go 1.18 + +require ( + github.com/fluent/fluent-logger-golang v1.9.0 + github.com/hashicorp/consul/api v1.18.0 + github.com/streadway/amqp v1.0.0 +) + +require ( + github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da // indirect + github.com/bmizerany/assert v0.0.0-20160611221934-b7ed37b82869 // indirect + github.com/fatih/color v1.9.0 // indirect + github.com/hashicorp/go-cleanhttp v0.5.1 // indirect + github.com/hashicorp/go-hclog v0.12.0 // indirect + github.com/hashicorp/go-immutable-radix v1.0.0 // indirect + github.com/hashicorp/go-rootcerts v1.0.2 // indirect + github.com/hashicorp/golang-lru v0.5.4 // indirect + github.com/hashicorp/serf v0.10.1 // indirect + github.com/mattn/go-colorable v0.1.6 // indirect + github.com/mattn/go-isatty v0.0.12 // indirect + github.com/mitchellh/go-homedir v1.1.0 // indirect + github.com/mitchellh/mapstructure v1.4.1 // indirect + github.com/philhofer/fwd v1.1.1 // indirect + github.com/tinylib/msgp v1.1.6 // indirect + golang.org/x/sys v0.0.0-20220728004956-3c1f35247d10 // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..5c5fd2d --- /dev/null +++ b/go.sum @@ -0,0 +1,167 @@ +github.com/armon/circbuf v0.0.0-20150827004946-bbbad097214e/go.mod h1:3U/XgcO3hCbHZ8TKRvWD2dDTCfh9M9ya+I9JpbB7O8o= +github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da h1:8GUt8eRujhVEGZFFEjBj46YV4rDjvGrNxb0KMWYkL2I= +github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da/go.mod h1:Q73ZrmVTwzkszR9V5SSuryQ31EELlFMUz1kKyl939pY= +github.com/armon/go-radix v0.0.0-20180808171621-7fddfc383310/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8= +github.com/armon/go-radix v1.0.0/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8= +github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kBD4zp0CCIs= +github.com/bmizerany/assert v0.0.0-20160611221934-b7ed37b82869 h1:DDGfHa7BWjL4YnC6+E63dPcxHo2sUxDIu8g3QgEJdRY= +github.com/bmizerany/assert v0.0.0-20160611221934-b7ed37b82869/go.mod h1:Ekp36dRnpXw/yCqJaO+ZrUyxD+3VXMFFr56k5XYrpB4= +github.com/creack/pty 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h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= +gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= +gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= +gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= +gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo= +gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= diff --git a/src/amqp/connect.go b/src/amqp/connect.go new file mode 100644 index 0000000..9429823 --- /dev/null +++ b/src/amqp/connect.go @@ -0,0 +1,26 @@ +package amqp + +import ( + "log" + + "github.com/streadway/amqp" +) + +func Open(url string) (*amqp.Connection, *amqp.Channel, error) { + conn, err := amqp.Dial(url) + if err != nil { + return nil, nil, err + } + + ch, err := conn.Channel() + if err != nil { + log.Printf("Failed to open a channel: %v\n", err) + return nil, nil, err + } + + return conn, ch, nil +} + +func Close(conn *amqp.Connection) { + conn.Close() +} diff --git a/src/amqp/queue.go b/src/amqp/queue.go new file mode 100644 index 0000000..844c353 --- /dev/null +++ b/src/amqp/queue.go @@ -0,0 +1,85 @@ +package amqp + +import ( + "bytes" + "encoding/json" + "fmt" + "log" + + "github.com/streadway/amqp" +) + +type Message map[string]interface{} + +func Serialize(msg any) (string, error) { + var b bytes.Buffer + encoder := json.NewEncoder(&b) + err := encoder.Encode(msg) + + return b.String(), err +} + +func Deserialize(b []byte) (Message, error) { + var msg Message + buf := bytes.NewBuffer(b) + decoder := json.NewDecoder(buf) + err := decoder.Decode(&msg) + + return msg, err +} + +func NewExchange(chn *amqp.Channel, name string) error { + err := chn.ExchangeDeclare( + name, + "direct", // type + true, // durable + false, // auto-deleted + false, // internal + false, // no-wait + nil, // arguments + ) + + if err != nil { + return err + } + + return nil +} + +func Publish(chn *amqp.Channel, name, routingKey string, msg any) error { + jsonData, err := Serialize(msg) + if err != nil { + return err + } + + msgBody := fmt.Sprintf(`{"event":"%T","data":%s}`, msg, jsonData) + chn.Publish( + name, // exchange name + routingKey, // routing key + false, // mandatory + false, // immediate + amqp.Publishing{ + ContentType: "application/json", + Body: []byte(msgBody), + }, + ) + + return nil +} + +func BindQueueToExchange(chn *amqp.Channel, queueName, exchName, routingKey string) error { + err := chn.QueueBind( + queueName, // queue name + routingKey, // routing key + exchName, // exchange name + false, + nil, + ) + if err != nil { + log.Printf("Failed to bind a queue: %s\n", queueName) + + return err + } + + return nil +} diff --git a/src/consul/discovery.go b/src/consul/discovery.go new file mode 100644 index 0000000..ed3fbc7 --- /dev/null +++ b/src/consul/discovery.go @@ -0,0 +1,129 @@ +package consul + +import ( + "fmt" + "log" + "net/http" + "strconv" + "time" + + consul "github.com/hashicorp/consul/api" +) + +type Service struct { + Name string + Address string + Port int + TTL time.Duration + ConsulAgent *consul.Agent +} + +var ErrServiceUnavailable = fmt.Errorf("Service is unavailable") + +func NewService(serverAddr, appName, appDomain string, appPort int) (*Service, error) { + s := new(Service) + s.Name = appName + s.Address = appDomain + s.Port = appPort + s.TTL = time.Second * 15 + + client, err := consul.NewClient(newClientConfig(serverAddr)) + if err != nil { + return nil, err + } + s.ConsulAgent = client.Agent() + + return s, nil +} + +func newClientConfig(serverAddr string) *consul.Config { + conf := consul.DefaultConfig() + conf.Address = serverAddr + + return conf +} + +func (s *Service) Register() error { + def := &consul.AgentServiceRegistration{ + // ID: s.Name, + Name: s.Name, + Address: s.Address, + Port: s.Port, + Tags: s.getTags(), + Check: &consul.AgentServiceCheck{ + TTL: s.TTL.String(), + }, + } + + if err := s.ConsulAgent.ServiceRegister(def); err != nil { + return err + } + go s.UpdateTTL(def) + + return nil +} +func (s *Service) Unregister() error { + return s.ConsulAgent.ServiceDeregister(s.Name) +} + +func (s *Service) UpdateTTL(service *consul.AgentServiceRegistration) { + ticker := time.NewTicker(s.TTL / 2) + for range ticker.C { + ok, err := s.check() + if !ok { + if err := s.ConsulAgent.FailTTL("service:"+s.Name, err.Error()); err != nil { + log.Println(err) + } + } else { + if err := s.ConsulAgent.PassTTL("service:"+s.Name, "OK"); err != nil { + log.Println(err) + } + } + } +} + +func (s *Service) check() (bool, error) { + client := &http.Client{} + healthUrl := fmt.Sprintf("http://%s:%d/health", s.Address, s.Port) + req, err := http.NewRequest(http.MethodGet, healthUrl, nil) + if err != nil { + return false, ErrServiceUnavailable + } + req.Header.Set("User-Agent", "Health Check") + + resp, err := client.Do(req) + if err != nil { + return false, ErrServiceUnavailable + } + defer resp.Body.Close() + + if resp.StatusCode == http.StatusOK { + return true, nil + } + + return false, ErrServiceUnavailable +} + +func (s *Service) getTags() []string { + name, addr, port := s.Name, s.Address, strconv.Itoa(s.Port) + + tags := []string{ + "traefik.enable=true", + "traefik.http.routers." + name + ".rule=Host(`" + addr + "`)", + "traefik.http.routers." + name + ".entryPoints=https", + "traefik.http.routers." + name + ".service=" + name, + "traefik.http.routers." + name + ".middlewares=compress,requestid", + "traefik.http.routers." + name + ".tls=true", + "traefik.http.services." + name + ".loadbalancer.server.scheme=http", + "traefik.http.services." + name + ".loadbalancer.server.port=" + port, + "traefik.http.services." + name + ".loadbalancer.passhostheader=false", + "traefik.http.middlewares.compress.compress=true", + "traefik.http.middlewares.requestid.plugin.requestid.headerName=X-Request-ID", + // "traefik.http.services." + name + ".loadbalancer.healthcheck.path=/health", + // "traefik.http.services." + name + ".loadbalancer.healthcheck.interval=10s", + // "traefik.tls.certificates.certfile=/certs/client.cert", + // "traefik.tls.certificates.keyfile=/certs/client.key", + } + + return tags +} diff --git a/src/fluentd/config.go b/src/fluentd/config.go new file mode 100644 index 0000000..48255d2 --- /dev/null +++ b/src/fluentd/config.go @@ -0,0 +1,14 @@ +package fluentd + +import ( + "strconv" + "strings" +) + +func ParseAddr(addr string) (string, int) { + p := strings.Split(addr, ":") + fHost := p[0] + fPort, _ := strconv.Atoi(p[1]) + + return fHost, fPort +} diff --git a/src/fluentd/logger.go b/src/fluentd/logger.go new file mode 100644 index 0000000..2ffa50d --- /dev/null +++ b/src/fluentd/logger.go @@ -0,0 +1,41 @@ +package fluentd + +import ( + "fmt" + "log" + + "github.com/fluent/fluent-logger-golang/fluent" +) + +type Logger struct { + fluent *fluent.Fluent + appName string +} + +func NewLogger(appName, fHost string, fPort int) *Logger { + config := fluent.Config{ + FluentHost: fHost, + FluentPort: fPort, + // WriteTimeout: -1, + } + fluent, err := fluent.New(config) + if err != nil { + log.Panicf("Error connecting to %s: %v", fHost, err) + } + + return &Logger{fluent, appName} +} + +func (l *Logger) Log(format string, v ...any) { + mapData := map[string]string{ + "message": fmt.Sprintf(format, v...), + } + err := l.fluent.Post(l.appName, mapData) + if err != nil { + log.Println("Error sending log: ", err) + } +} + +func (l *Logger) Close() error { + return l.fluent.Close() +}