mredis: initial implementation

env.test

@@ -22,3 +22,8 @@ if ! (sudo systemctl status mysqld 1>/dev/null); then
     echo "starting mysqld"
     sudo systemctl start mysqld
 fi
+
+if ! (sudo systemctl status redis 1>/dev/null); then
+    echo "starting redis"
+    sudo systemctl start redis
+fi

go.mod

@@ -5,9 +5,10 @@ require (
 	github.com/boombuler/barcode v1.0.0 // indirect
 	github.com/go-sql-driver/mysql v1.4.0
 	github.com/jmoiron/sqlx v1.2.0
+	github.com/mediocregopher/radix/v3 v3.3.1-0.20190716044027-c72935c74ab3
 	github.com/pquerna/otp v1.1.0
 	github.com/stretchr/testify v1.3.0
-	golang.org/x/net v0.0.0-20190213061140-3a22650c66bd
+	golang.org/x/net v0.0.0-20190213061140-3a22650c66bd // indirect
 	google.golang.org/api v0.1.0
 	google.golang.org/grpc v1.18.0
 	gopkg.in/mgo.v2 v2.0.0-20180705113604-9856a29383ce

go.sum

@@ -62,6 +62,8 @@ github.com/lib/pq v1.0.0/go.mod h1:5WUZQaWbwv1U+lTReE5YruASi9Al49XbQIvNi/34Woo=
 github.com/mattn/go-sqlite3 v1.9.0 h1:pDRiWfl+++eC2FEFRy6jXmQlvp4Yh3z1MJKg4UeYM/4=
 github.com/mattn/go-sqlite3 v1.9.0/go.mod h1:FPy6KqzDD04eiIsT53CuJW3U88zkxoIYsOqkbpncsNc=
 github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5Ld7szi9bcBfOoFv/3dc6xSMkL2PC0=
+github.com/mediocregopher/radix/v3 v3.3.1-0.20190716044027-c72935c74ab3 h1:UjRk86epRQI7V3yFJaR7nYiahIoCMLI/1YjtH5ANfkw=
+github.com/mediocregopher/radix/v3 v3.3.1-0.20190716044027-c72935c74ab3/go.mod h1:RsC7cELtyL4TGkg0nwRPTa+J2TXZ0dh/ruohD3rnjMk=
 github.com/microcosm-cc/bluemonday v1.0.1/go.mod h1:hsXNsILzKxV+sX77C5b8FSuKF00vh2OMYv+xgHpAMF4=
 github.com/neelance/astrewrite v0.0.0-20160511093645-99348263ae86/go.mod h1:kHJEU3ofeGjhHklVoIGuVj85JJwZ6kWPaJwCIxgnFmo=
 github.com/neelance/sourcemap v0.0.0-20151028013722-8c68805598ab/go.mod h1:Qr6/a/Q4r9LP1IltGz7tA7iOK1WonHEYhu1HRBA7ZiM=
@@ -139,6 +141,8 @@ golang.org/x/time v0.0.0-20180412165947-fbb02b2291d2/go.mod h1:tRJNPiyCQ0inRvYxb
 golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/tools v0.0.0-20180828015842-6cd1fcedba52/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20181030000716-a0a13e073c7b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/xerrors v0.0.0-20190513163551-3ee3066db522 h1:bhOzK9QyoD0ogCnFro1m2mz41+Ib0oOhfJnBp5MR4K4=
+golang.org/x/xerrors v0.0.0-20190513163551-3ee3066db522/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/api v0.0.0-20180910000450-7ca32eb868bf/go.mod h1:4mhQ8q/RsB7i+udVvVy5NUi08OU8ZlA0gRVgrF7VFY0=
 google.golang.org/api v0.0.0-20181030000543-1d582fd0359e/go.mod h1:4mhQ8q/RsB7i+udVvVy5NUi08OU8ZlA0gRVgrF7VFY0=
 google.golang.org/api v0.1.0 h1:K6z2u68e86TPdSdefXdzvXgR1zEMa+459vBSfWYAZkI=

mdb/mredis/redis.go

@@ -0,0 +1,50 @@
+// Package mredis implements connecting to a redis instance.
+package mredis
+
+import (
+	"context"
+
+	"github.com/mediocregopher/mediocre-go-lib/mcfg"
+	"github.com/mediocregopher/mediocre-go-lib/mcmp"
+	"github.com/mediocregopher/mediocre-go-lib/mlog"
+	"github.com/mediocregopher/mediocre-go-lib/mrun"
+	"github.com/mediocregopher/radix/v3"
+)
+
+// Redis is a wrapper around a redis client which provides more functionality.
+type Redis struct {
+	radix.Client
+	cmp *mcmp.Component
+}
+
+// InstRedis instantiates a Redis instance which will be initialized when the
+// Init event is triggered on the given Component. The redis client will have
+// Close called on it when the Shutdown event is triggered on the given
+// Component.
+func InstRedis(parent *mcmp.Component) *Redis {
+	cmp := parent.Child("redis")
+	client := new(struct{ radix.Client })
+
+	addr := mcfg.String(cmp, "addr",
+		mcfg.ParamDefault("127.0.0.1:6379"),
+		mcfg.ParamUsage("Address redis is listening on"))
+	poolSize := mcfg.Int(cmp, "pool-size",
+		mcfg.ParamDefault(4),
+		mcfg.ParamUsage("Number of connections in pool"))
+	mrun.InitHook(cmp, func(ctx context.Context) error {
+		cmp.Annotate("addr", *addr, "poolSize", *poolSize)
+		mlog.From(cmp).Info("connecting to redis", ctx)
+		var err error
+		client.Client, err = radix.NewPool("tcp", *addr, *poolSize)
+		return err
+	})
+	mrun.ShutdownHook(cmp, func(ctx context.Context) error {
+		mlog.From(cmp).Info("shutting down redis", ctx)
+		return client.Close()
+	})
+
+	return &Redis{
+		Client: client,
+		cmp:    cmp,
+	}
+}

mdb/mredis/redis_test.go

@@ -0,0 +1,22 @@
+package mredis
+
+import (
+	. "testing"
+
+	"github.com/mediocregopher/mediocre-go-lib/mtest"
+
+	"github.com/mediocregopher/radix/v3"
+)
+
+func TestRedis(t *T) {
+	cmp := mtest.Component()
+	redis := InstRedis(cmp)
+	mtest.Run(cmp, t, func() {
+		var info string
+		if err := redis.Do(radix.Cmd(&info, "INFO")); err != nil {
+			t.Fatal(err)
+		} else if len(info) < 0 {
+			t.Fatal("empty info return")
+		}
+	})
+}