diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..09aaaf1 --- /dev/null +++ b/LICENSE @@ -0,0 +1,21 @@ +MIT License + +Copyright (c) 2018 Evgeniy Kulikov + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. diff --git a/README.md b/README.md new file mode 100644 index 0000000..a1f8093 --- /dev/null +++ b/README.md @@ -0,0 +1,56 @@ +# NATS Module for Helium + +Module provides you with the following things: +- [`*nats.Conn`](https://godoc.org/github.com/nats-io/go-nats#Conn) represents a bare connection to a nats-server. It can send and receive []byte payloads +- [`stan.Conn`](https://godoc.org/github.com/nats-io/go-nats-streaming#Conn) represents a connection to the NATS Streaming subsystem. It can Publish and Subscribe to messages within the NATS Streaming cluster. + +Configuration: +- yaml example +```yaml +nats: + url: nats://: + cluster_id: string + client_id: string + servers: [...server slice...] + no_randomize: bool + name: string + verbose: bool + pedantic: bool + secure: bool + allow_reconnect: bool + max_reconnect: int + reconnect_wait: duration + timeout: duration + flusher_timeout: duration + ping_interval: duration + max_pings_out: int + reconnect_buf_size: int + sub_chan_len: int + user: string + password: string + token: string +``` +- env example +``` +NATS_URL=nats://: +NATS_CLUSTER_ID=string +NATS_CLIENT_ID=string +NATS_SERVERS=[...server slice...] +NATS_NO_RANDOMIZE=bool +NATS_NAME=string +NATS_VERBOSE=bool +NATS_PEDANTIC=bool +NATS_SECURE=bool +NATS_ALLOW_RECONNECT=bool +NATS_MAX_RECONNECT=int +NATS_RECONNECT_WAIT=duration +NATS_TIMEOUT=duration +NATS_FLUSHER_TIMEOUT=duration +NATS_PING_INTERVAL=duration +NATS_MAX_PINGS_OUT=int +NATS_RECONNECT_BUF_SIZE=int +NATS_SUB_CHAN_LEN=int +NATS_USER=string +NATS_PASSWORD=string +NATS_TOKEN=string +``` \ No newline at end of file diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..64da97b --- /dev/null +++ b/go.mod @@ -0,0 +1,12 @@ +module github.com/go-helium/nats + +require ( + github.com/im-kulikov/helium v0.9.2 + github.com/nats-io/go-nats v1.7.2 + github.com/nats-io/go-nats-streaming v0.4.0 + github.com/nats-io/nats-streaming-server v0.11.2 + github.com/pkg/errors v0.8.1 + github.com/smartystreets/goconvey v0.0.0-20190222223459-a17d461953aa + github.com/spf13/viper v1.3.1 + go.etcd.io/bbolt v1.3.2 // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..eac29d3 --- /dev/null +++ b/go.sum @@ -0,0 +1,213 @@ +bou.ke/monkey v1.0.1/go.mod h1:FgHuK96Rv2Nlf+0u1OOVDpCMdsWyOFmeeketDHE7LIg= +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +github.com/BurntSushi/toml v0.3.1 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b/nats.go @@ -0,0 +1,127 @@ +package nats + +import ( + "github.com/im-kulikov/helium/module" + "github.com/nats-io/go-nats" + "github.com/nats-io/go-nats-streaming" + "github.com/pkg/errors" + "github.com/spf13/viper" +) + +type ( + // Config alias + Config = nats.Options + + // StreamerConfig + StreamerConfig struct { + ClientID string + ClusterID string + Options []stan.Option + } + + // Client alias + Client = nats.Conn +) + +var ( + // Module is default Nats client + Module = module.Module{ + {Constructor: NewDefaultConfig}, + {Constructor: NewConnection}, + {Constructor: NewDefaultStreamerConfig}, + {Constructor: NewStreamer}, + } + + // ErrEmptyConfig when given empty options + ErrEmptyConfig = errors.New("nats empty config") + // ErrEmptyStreamerConfig when given empty options + ErrEmptyStreamerConfig = errors.New("nats-streamer empty config") + // ErrNoNatsConnection when empty nats.Conn + ErrEmptyConnection = errors.New("nats connection empty") + // ErrClusterIDEmpty when empty clusterID + ErrClusterIDEmpty = errors.New("nats.cluster_id cannot be empty") + // ErrClientIDEmpty when empty clientID + ErrClientIDEmpty = errors.New("nats.client_id cannot be empty") +) + +// NewDefaultConfig default settings for connection +func NewDefaultConfig(v *viper.Viper) (*Config, error) { + if !v.IsSet("nats") { + return nil, ErrEmptyConfig + } + + var servers []string + if v.IsSet("nats.servers") { + servers = v.GetStringSlice("nats.servers") + } + + return &Config{ + Url: v.GetString("nats.url"), + Servers: servers, + NoRandomize: v.GetBool("nats.no_randomize"), + Name: v.GetString("nats.name"), + Verbose: v.GetBool("nats.verbose"), + Pedantic: v.GetBool("nats.pedantic"), + Secure: v.GetBool("nats.secure"), + AllowReconnect: v.GetBool("nats.allow_reconnect"), + MaxReconnect: v.GetInt("nats.max_reconnect"), + ReconnectWait: v.GetDuration("nats.reconnect_wait"), + Timeout: v.GetDuration("nats.timeout"), + FlusherTimeout: v.GetDuration("nats.flusher_timeout"), + PingInterval: v.GetDuration("nats.ping_interval"), + MaxPingsOut: v.GetInt("nats.max_pings_out"), + ReconnectBufSize: v.GetInt("nats.reconnect_buf_size"), + SubChanLen: v.GetInt("nats.sub_chan_len"), + User: v.GetString("nats.user"), + Password: v.GetString("nats.password"), + Token: v.GetString("nats.token"), + }, nil +} + +// NewDefaultConfig default settings for streaming connection +func NewDefaultStreamerConfig(v *viper.Viper, bus *Client) (*StreamerConfig, error) { + if !v.IsSet("nats") { + return nil, ErrEmptyConfig + } + + var clusterID, clientID string + if clusterID = v.GetString("nats.cluster_id"); clusterID == "" { + return nil, ErrClusterIDEmpty + } + + if clientID = v.GetString("nats.client_id"); clientID == "" { + return nil, ErrClientIDEmpty + } + + return &StreamerConfig{ + ClientID: clientID, + ClusterID: clusterID, + Options: []stan.Option{stan.NatsConn(bus)}, + }, nil +} + +// NewConnection of nats client +func NewConnection(opts *Config) (bus *Client, err error) { + if opts == nil { + return nil, ErrEmptyConfig + } + + if bus, err = opts.Connect(); err != nil { + return nil, err + } + + return bus, nil +} + +// NewStreamer is nats-streamer client +func NewStreamer(opts *StreamerConfig) (stan.Conn, error) { + if opts == nil { + return nil, ErrEmptyStreamerConfig + } + + if opts.Options == nil || len(opts.Options) == 0 { + return nil, ErrEmptyConnection + } + + return stan.Connect(opts.ClusterID, opts.ClientID, opts.Options...) +} diff --git a/nats_test.go b/nats_test.go new file mode 100644 index 0000000..fefe191 --- /dev/null +++ b/nats_test.go @@ -0,0 +1,151 @@ +package nats + +import ( + "testing" + + "github.com/nats-io/go-nats" + "github.com/nats-io/nats-streaming-server/server" + . "github.com/smartystreets/goconvey/convey" + "github.com/spf13/viper" +) + +func RunServer(ID string) *server.StanServer { + s, err := server.RunServer(ID) + if err != nil { + panic(err) + } + return s +} + +func TestNewDefaultConfig(t *testing.T) { + Convey("Check nats module", t, func() { + v := viper.New() + + Convey("must fail on empty", func() { + c, err := NewDefaultConfig(v) + So(c, ShouldBeNil) + So(err, ShouldBeError) + }) + + Convey("servers should be nil", func() { + v.SetDefault("nats.url", "something") + + c, err := NewDefaultConfig(v) + So(err, ShouldBeNil) + So(c.Servers, ShouldBeNil) + }) + + Convey("servers should be slice of string", func() { + v.SetDefault("nats.servers", "something") + + c, err := NewDefaultConfig(v) + So(err, ShouldBeNil) + So(c.Servers, ShouldHaveLength, 1) + So(c.Servers[0], ShouldEqual, "something") + }) + + Convey("should be ok", func() { + url := "something" + v.SetDefault("nats.url", url) + + c, err := NewDefaultConfig(v) + So(err, ShouldBeNil) + So(c.Url, ShouldEqual, url) + }) + + Convey("should fail for empty config", func() { + c, err := NewConnection(nil) + So(c, ShouldBeNil) + So(err, ShouldBeError, ErrEmptyConfig) + }) + + Convey("should fail for empty config on nats-stremer", func() { + c, err := NewStreamer(nil) + So(c, ShouldBeNil) + So(err, ShouldBeError, ErrEmptyStreamerConfig) + }) + + Convey("should fail client", func() { + + v.SetDefault("nats.url", nats.DefaultURL) + + c, err := NewDefaultConfig(v) + So(err, ShouldBeNil) + So(c.Url, ShouldEqual, nats.DefaultURL) + + cli, err := NewConnection(c) + So(cli, ShouldBeNil) + So(err, ShouldBeError) + }) + + Convey("should not fail with test server", func() { + serve := RunServer(nats.DefaultURL) + defer serve.Shutdown() + + v.SetDefault("nats.url", nats.DefaultURL) + + c, err := NewDefaultConfig(v) + So(err, ShouldBeNil) + + cli, err := NewConnection(c) + So(err, ShouldBeNil) + So(cli, ShouldNotBeNil) + }) + + Convey("should fail with empty config", func() { + cfg, err := NewDefaultStreamerConfig(v, nil) + So(cfg, ShouldBeNil) + So(err, ShouldBeError, ErrEmptyConfig) + }) + + Convey("should fail with empty clusterID", func() { + v.SetDefault("nats.cluster_id", "") + cfg, err := NewDefaultStreamerConfig(v, nil) + So(cfg, ShouldBeNil) + So(err, ShouldBeError, ErrClusterIDEmpty) + }) + + Convey("should fail with empty clientID", func() { + v.SetDefault("nats.cluster_id", "myCluster") + cfg, err := NewDefaultStreamerConfig(v, nil) + So(cfg, ShouldBeNil) + So(err, ShouldBeError, ErrClientIDEmpty) + }) + + Convey("should fail on connection empty", func() { + v.SetDefault("nats.url", nats.DefaultURL) + v.SetDefault("nats.client_id", "myClient") + v.SetDefault("nats.cluster_id", "myCluster") + + cfg, err := NewDefaultStreamerConfig(v, nil) + So(err, ShouldBeNil) + + cfg.Options = nil + + stan, err := NewStreamer(cfg) + So(stan, ShouldBeNil) + So(err, ShouldBeError, ErrEmptyConnection) + }) + + Convey("should run streamer client", func() { + v.SetDefault("nats.client_id", "myClient") + v.SetDefault("nats.cluster_id", "myCluster") + + // Run a NATS Streaming server + s := RunServer("myCluster") + defer s.Shutdown() + + con, err := nats.Connect(nats.DefaultURL) + So(err, ShouldBeNil) + + defer con.Close() + + cfg, err := NewDefaultStreamerConfig(v, con) + So(err, ShouldBeNil) + + st, err := NewStreamer(cfg) + So(err, ShouldBeNil) + So(st.Close(), ShouldBeNil) + }) + }) +}