From 98e6e7f8d4e6b92e016e77d84fee0f60adb11811 Mon Sep 17 00:00:00 2001
From: Evgeniy Kulikov <im@kulikov.im>
Date: Sun, 24 Feb 2019 22:04:41 +0300
Subject: [PATCH] NATS module init
---
LICENSE | 21 +++++
README.md | 56 ++++++++++++++
go.mod | 12 +++
go.sum | 213 +++++++++++++++++++++++++++++++++++++++++++++++++++
nats.go | 127 ++++++++++++++++++++++++++++++
nats_test.go | 151 ++++++++++++++++++++++++++++++++++++
6 files changed, 580 insertions(+)
create mode 100644 LICENSE
create mode 100644 README.md
create mode 100644 go.mod
create mode 100644 go.sum
create mode 100644 nats.go
create mode 100644 nats_test.go
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://<host>:<port>
+ 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://<host>:<port>
+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 @@
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diff --git a/nats.go b/nats.go
new file mode 100644
index 0000000..422ae00
--- /dev/null
+++ 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)
+ })
+ })
+}