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https://github.com/mainflux/mainflux.git
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* MF-325 - Add SPDX license and copyright headers Signed-off-by: Ivan Milošević <iva@blokovi.com> * MF-325 - Add SPDX license and copyright headers Signed-off-by: Ivan Milošević <iva@blokovi.com> * MF-325 - Add SPDX license and copyright headers Signed-off-by: Ivan Milošević <iva@blokovi.com> * MF-325 - Add SPDX license and copyright headers Signed-off-by: Ivan Milošević <iva@blokovi.com> * MF-325 - Change mainflux version from 0.4.0 to 0.5.0 Signed-off-by: Ivan Milošević <iva@blokovi.com>
135 lines
3.3 KiB
Go
135 lines
3.3 KiB
Go
//
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// Copyright (c) 2018
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// Mainflux
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//
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// SPDX-License-Identifier: Apache-2.0
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//
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package main
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import (
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"fmt"
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"net/http"
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"os"
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"os/signal"
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"strings"
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"syscall"
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kitprometheus "github.com/go-kit/kit/metrics/prometheus"
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"github.com/gocql/gocql"
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"github.com/mainflux/mainflux"
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log "github.com/mainflux/mainflux/logger"
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"github.com/mainflux/mainflux/readers"
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"github.com/mainflux/mainflux/readers/api"
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"github.com/mainflux/mainflux/readers/cassandra"
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thingsapi "github.com/mainflux/mainflux/things/api/grpc"
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stdprometheus "github.com/prometheus/client_golang/prometheus"
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"google.golang.org/grpc"
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)
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const (
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sep = ","
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defPort = "8180"
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defCluster = "127.0.0.1"
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defKeyspace = "mainflux"
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defThingsURL = "localhost:8181"
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envPort = "MF_CASSANDRA_READER_PORT"
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envCluster = "MF_CASSANDRA_READER_DB_CLUSTER"
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envKeyspace = "MF_CASSANDRA_READER_DB_KEYSPACE"
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envThingsURL = "MF_THINGS_URL"
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)
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type config struct {
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port string
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cluster string
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keyspace string
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thingsURL string
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}
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func main() {
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cfg := loadConfig()
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logger := log.New(os.Stdout)
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session := connectToCassandra(cfg.cluster, cfg.keyspace, logger)
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defer session.Close()
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conn := connectToThings(cfg.thingsURL, logger)
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defer conn.Close()
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tc := thingsapi.NewClient(conn)
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repo := newService(session, logger)
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errs := make(chan error, 2)
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go startHTTPServer(repo, tc, cfg.port, errs, logger)
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go func() {
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c := make(chan os.Signal)
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signal.Notify(c, syscall.SIGINT)
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errs <- fmt.Errorf("%s", <-c)
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}()
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err := <-errs
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logger.Error(fmt.Sprintf("Cassandra reader service terminated: %s", err))
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}
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func loadConfig() config {
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return config{
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port: mainflux.Env(envPort, defPort),
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cluster: mainflux.Env(envCluster, defCluster),
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keyspace: mainflux.Env(envKeyspace, defKeyspace),
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thingsURL: mainflux.Env(envThingsURL, defThingsURL),
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}
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}
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func connectToCassandra(cluster, keyspace string, logger log.Logger) *gocql.Session {
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session, err := cassandra.Connect(strings.Split(cluster, sep), keyspace)
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if err != nil {
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logger.Error(fmt.Sprintf("Failed to connect to Cassandra cluster: %s", err))
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os.Exit(1)
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}
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return session
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}
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func connectToThings(url string, logger log.Logger) *grpc.ClientConn {
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conn, err := grpc.Dial(url, grpc.WithInsecure())
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if err != nil {
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logger.Error(fmt.Sprintf("Failed to connect to things service: %s", err))
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os.Exit(1)
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}
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return conn
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}
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func newService(session *gocql.Session, logger log.Logger) readers.MessageRepository {
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repo := cassandra.New(session)
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repo = api.LoggingMiddleware(repo, logger)
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repo = api.MetricsMiddleware(
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repo,
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kitprometheus.NewCounterFrom(stdprometheus.CounterOpts{
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Namespace: "cassandra",
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Subsystem: "message_reader",
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Name: "request_count",
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Help: "Number of requests received.",
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}, []string{"method"}),
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kitprometheus.NewSummaryFrom(stdprometheus.SummaryOpts{
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Namespace: "cassandra",
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Subsystem: "message_reader",
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Name: "request_latency_microseconds",
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Help: "Total duration of requests in microseconds.",
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}, []string{"method"}),
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)
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return repo
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}
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func startHTTPServer(repo readers.MessageRepository, tc mainflux.ThingsServiceClient, port string, errs chan error, logger log.Logger) {
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p := fmt.Sprintf(":%s", port)
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logger.Info(fmt.Sprintf("Cassandra reader service started, exposed port %s", port))
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errs <- http.ListenAndServe(p, api.MakeHandler(repo, tc, "cassandra-reader"))
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}
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