feat: Adding possibility to set default tags

CHANGELOG.md

@@ -1,6 +1,7 @@
 ## 1.3.0 [in progress]
 ### Features
 1. [#131](https://github.com/influxdata/influxdb-client-go/pull/131) Labels API
+1. [#136](https://github.com/influxdata/influxdb-client-go/pull/136) Possibility to specify default tags
 
 ### Bug fixes 
 1. [#132](https://github.com/influxdata/influxdb-client-go/pull/132) Handle unsupported write type as string instead of generating panic

api/write/options.go

@@ -25,6 +25,8 @@ type Options struct {
 	precision time.Duration
 	// Whether to use GZip compression in requests. Default false
 	useGZip bool
+	// Tags added to each point during writing. If a point already has a tag with the same key, it is left unchanged.
+	defaultTags map[string]string
 }
 
 // BatchSize returns size of batch
@@ -104,7 +106,23 @@ func (o *Options) SetUseGZip(useGZip bool) *Options {
 	return o
 }
 
+// AddDefaultTag adds a default tag. DefaultTags are added to each written point.
+// If a tag with the same key already exist it is overwritten.
+// If a point already defines such a tag, it is left unchanged.
+func (o *Options) AddDefaultTag(key, value string) *Options {
+	o.DefaultTags()[key] = value
+	return o
+}
+
+// DefaultTags returns set of default tags
+func (o *Options) DefaultTags() map[string]string {
+	if o.defaultTags == nil {
+		o.defaultTags = make(map[string]string)
+	}
+	return o.defaultTags
+}
+
 // DefaultOptions returns Options object with default values
 func DefaultOptions() *Options {
-	return &Options{batchSize: 5000, maxRetries: 3, retryInterval: 1000, flushInterval: 1000, precision: time.Nanosecond, useGZip: false, retryBufferLimit: 10000}
+	return &Options{batchSize: 5000, maxRetries: 3, retryInterval: 1000, flushInterval: 1000, precision: time.Nanosecond, useGZip: false, retryBufferLimit: 10000, defaultTags: make(map[string]string)}
 }

api/write/options_test.go

@@ -21,6 +21,7 @@ func TestDefaultOptions(t *testing.T) {
 	assert.Equal(t, uint(10000), opts.RetryBufferLimit())
 	assert.Equal(t, uint(1000), opts.RetryInterval())
 	assert.Equal(t, uint(3), opts.MaxRetries())
+	assert.Len(t, opts.DefaultTags(), 0)
 }
 
 func TestSettingsOptions(t *testing.T) {
@@ -31,12 +32,15 @@ func TestSettingsOptions(t *testing.T) {
 		SetPrecision(time.Millisecond).
 		SetRetryBufferLimit(5).
 		SetRetryInterval(5000).
-		SetMaxRetries(7)
+		SetMaxRetries(7).
+		AddDefaultTag("a", "1").
+		AddDefaultTag("b", "2")
 	assert.Equal(t, uint(5), opts.BatchSize())
 	assert.Equal(t, true, opts.UseGZip())
 	assert.Equal(t, uint(5000), opts.FlushInterval())
 	assert.Equal(t, time.Millisecond, opts.Precision())
 	assert.Equal(t, uint(5), opts.RetryBufferLimit())
 	assert.Equal(t, uint(5000), opts.RetryInterval())
 	assert.Equal(t, uint(7), opts.MaxRetries())
+	assert.Len(t, opts.DefaultTags(), 2)
 }

api/write_test.go

@@ -181,6 +181,25 @@ func genRecords(num int) []string {
 	return lines
 }
 
+func TestWriteApiWriteDefaultTag(t *testing.T) {
+	service := newTestService(t, "http://localhost:8888")
+	opts := write.DefaultOptions().
+		SetBatchSize(1)
+	opts.AddDefaultTag("dft", "a")
+	writeApi := NewWriteApiImpl("my-org", "my-bucket", service, opts)
+	point := write.NewPoint("test",
+		map[string]string{
+			"vendor": "AWS",
+		},
+		map[string]interface{}{
+			"mem_free": 1234567,
+		}, time.Unix(60, 60))
+	writeApi.WritePoint(point)
+	writeApi.Close()
+	require.Len(t, service.Lines(), 1)
+	assert.Equal(t, "test,dft=a,vendor=AWS mem_free=1234567i 60000000060", service.Lines()[0])
+}
+
 func TestWriteApiImpl_Write(t *testing.T) {
 	service := newTestService(t, "http://localhost:8888")
 	writeApi := NewWriteApiImpl("my-org", "my-bucket", service, write.DefaultOptions().SetBatchSize(5))

internal/write/writeService.go → internal/write/service.go

@@ -10,6 +10,7 @@ import (
 	"io"
 	"net/http"
 	"net/url"
+	"sort"
 	"strings"
 	"sync"
 	"time"
@@ -150,21 +151,78 @@ func (w *Service) WriteBatch(ctx context.Context, batch *Batch) error {
 	return nil
 }
 
+type pointWithDefaultTags struct {
+	point       *write.Point
+	defaultTags map[string]string
+}
+
+// Name returns the name of measurement of a point.
+func (p *pointWithDefaultTags) Name() string {
+	return p.point.Name()
+}
+
+// Time is the timestamp of a Point.
+func (p *pointWithDefaultTags) Time() time.Time {
+	return p.point.Time()
+}
+
+// FieldList returns a slice containing the fields of a Point.
+func (p *pointWithDefaultTags) FieldList() []*lp.Field {
+	return p.point.FieldList()
+}
+
+func (p *pointWithDefaultTags) TagList() []*lp.Tag {
+	tags := make([]*lp.Tag, 0, len(p.point.TagList())+len(p.defaultTags))
+	tags = append(tags, p.point.TagList()...)
+	for k, v := range p.defaultTags {
+		if !existTag(p.point.TagList(), k) {
+			tags = append(tags, &lp.Tag{
+				Key:   k,
+				Value: v,
+			})
+		}
+	}
+	sort.Slice(tags, func(i, j int) bool { return tags[i].Key < tags[j].Key })
+	return tags
+}
+
+func existTag(tags []*lp.Tag, key string) bool {
+	for _, tag := range tags {
+		if key == tag.Key {
+			return true
+		}
+	}
+	return false
+}
+
 func (w *Service) EncodePoints(points ...*write.Point) (string, error) {
 	var buffer bytes.Buffer
 	e := lp.NewEncoder(&buffer)
 	e.SetFieldTypeSupport(lp.UintSupport)
 	e.FailOnFieldErr(true)
 	e.SetPrecision(w.writeOptions.Precision())
 	for _, point := range points {
-		_, err := e.Encode(point)
+		_, err := e.Encode(w.pointToEncode(point))
 		if err != nil {
 			return "", err
 		}
 	}
 	return buffer.String(), nil
 }
 
+func (w *Service) pointToEncode(point *write.Point) lp.Metric {
+	var m lp.Metric
+	if len(w.writeOptions.DefaultTags()) > 0 {
+		m = &pointWithDefaultTags{
+			point:       point,
+			defaultTags: w.writeOptions.DefaultTags(),
+		}
+	} else {
+		m = point
+	}
+	return m
+}
+
 func (w *Service) WriteUrl() (string, error) {
 	if w.url == "" {
 		u, err := url.Parse(w.httpService.ServerApiUrl())

internal/write/service_test.go

@@ -0,0 +1,52 @@
+// Copyright 2020 InfluxData, Inc. All rights reserved.
+// Use of this source code is governed by MIT
+// license that can be found in the LICENSE file.
+
+package write
+
+import (
+	"github.com/influxdata/influxdb-client-go/api/write"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"testing"
+)
+
+func TestAddDefaultTags(t *testing.T) {
+	opts := write.DefaultOptions()
+	assert.Len(t, opts.DefaultTags(), 0)
+
+	opts.AddDefaultTag("dt1", "val1")
+	opts.AddDefaultTag("zdt", "val2")
+	srv := NewService("org", "buc", nil, opts)
+
+	p := write.NewPointWithMeasurement("test")
+	p.AddTag("id", "101")
+
+	p.AddField("float32", float32(80.0))
+
+	s, err := srv.EncodePoints(p)
+	require.Nil(t, err)
+	assert.Equal(t, "test,dt1=val1,id=101,zdt=val2 float32=80\n", s)
+	assert.Len(t, p.TagList(), 1)
+
+	p = write.NewPointWithMeasurement("x")
+	p.AddTag("xt", "1")
+	p.AddField("i", 1)
+
+	s, err = srv.EncodePoints(p)
+	require.Nil(t, err)
+	assert.Equal(t, "x,dt1=val1,xt=1,zdt=val2 i=1i\n", s)
+	assert.Len(t, p.TagList(), 1)
+
+	p = write.NewPointWithMeasurement("d")
+	p.AddTag("id", "1")
+	// do not overwrite point tag
+	p.AddTag("zdt", "val10")
+	p.AddField("i", -1)
+
+	s, err = srv.EncodePoints(p)
+	require.Nil(t, err)
+	assert.Equal(t, "d,dt1=val1,id=1,zdt=val10 i=-1i\n", s)
+
+	assert.Len(t, p.TagList(), 2)
+}

options.go

@@ -148,6 +148,14 @@ func (o *Options) HttpOptions() *http.Options {
 	return o.httpOptions
 }
 
+// AddDefaultTag adds a default tag. DefaultTags are added to each written point.
+// If a tag with the same key already exist it is overwritten.
+// If a point already defines such a tag, it is left unchanged
+func (o *Options) AddDefaultTag(key, value string) *Options {
+	o.WriteOptions().AddDefaultTag(key, value)
+	return o
+}
+
 // DefaultOptions returns Options object with default values
 func DefaultOptions() *Options {
 	return &Options{logLevel: 0, writeOptions: write.DefaultOptions(), httpOptions: http.DefaultOptions()}

options_test.go

@@ -1,7 +1,9 @@
-package influxdb2
+package influxdb2_test
 
 import (
 	"context"
+	"crypto/tls"
+	influxdb2 "github.com/influxdata/influxdb-client-go"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	"net/http"
@@ -11,6 +13,49 @@ import (
 	"time"
 )
 
+func TestDefaultOptions(t *testing.T) {
+	opts := influxdb2.DefaultOptions()
+	assert.Equal(t, uint(5000), opts.BatchSize())
+	assert.Equal(t, false, opts.UseGZip())
+	assert.Equal(t, uint(1000), opts.FlushInterval())
+	assert.Equal(t, time.Nanosecond, opts.Precision())
+	assert.Equal(t, uint(10000), opts.RetryBufferLimit())
+	assert.Equal(t, uint(1000), opts.RetryInterval())
+	assert.Equal(t, uint(3), opts.MaxRetries())
+	assert.Equal(t, (*tls.Config)(nil), opts.TlsConfig())
+	assert.Equal(t, uint(20), opts.HttpRequestTimeout())
+	assert.Equal(t, uint(0), opts.LogLevel())
+}
+
+func TestSettingsOptions(t *testing.T) {
+	tlsConfig := &tls.Config{
+		InsecureSkipVerify: true,
+	}
+	opts := influxdb2.DefaultOptions().
+		SetBatchSize(5).
+		SetUseGZip(true).
+		SetFlushInterval(5000).
+		SetPrecision(time.Millisecond).
+		SetRetryBufferLimit(5).
+		SetRetryInterval(5000).
+		SetMaxRetries(7).
+		SetTlsConfig(tlsConfig).
+		SetHttpRequestTimeout(50).
+		SetLogLevel(3).
+		AddDefaultTag("t", "a")
+	assert.Equal(t, uint(5), opts.BatchSize())
+	assert.Equal(t, true, opts.UseGZip())
+	assert.Equal(t, uint(5000), opts.FlushInterval())
+	assert.Equal(t, time.Millisecond, opts.Precision())
+	assert.Equal(t, uint(5), opts.RetryBufferLimit())
+	assert.Equal(t, uint(5000), opts.RetryInterval())
+	assert.Equal(t, uint(7), opts.MaxRetries())
+	assert.Equal(t, tlsConfig, opts.TlsConfig())
+	assert.Equal(t, uint(50), opts.HttpRequestTimeout())
+	assert.Equal(t, uint(3), opts.LogLevel())
+	assert.Len(t, opts.WriteOptions().DefaultTags(), 1)
+}
+
 func TestTimeout(t *testing.T) {
 	response := `,result,table,_start,_stop,_time,_value,_field,_measurement,a,b,
 		,,0,2020-02-17T22:19:49.747562847Z,2020-02-18T22:19:49.747562847Z,2020-02-18T10:34:08.135814545Z,1.4,f,test,1,adsfasdf
@@ -32,14 +77,14 @@ func TestTimeout(t *testing.T) {
 		}
 	}))
 	defer server.Close()
-	client := NewClientWithOptions(server.URL, "a", DefaultOptions().SetHttpRequestTimeout(1))
+	client := influxdb2.NewClientWithOptions(server.URL, "a", influxdb2.DefaultOptions().SetHttpRequestTimeout(1))
 	queryApi := client.QueryApi("org")
 
 	_, err := queryApi.QueryRaw(context.Background(), "flux", nil)
 	require.NotNil(t, err)
 	assert.True(t, strings.Contains(err.Error(), "Client.Timeout exceeded"))
 
-	client = NewClientWithOptions(server.URL, "a", DefaultOptions().SetHttpRequestTimeout(5))
+	client = influxdb2.NewClientWithOptions(server.URL, "a", influxdb2.DefaultOptions().SetHttpRequestTimeout(5))
 	queryApi = client.QueryApi("org")
 
 	result, err := queryApi.QueryRaw(context.Background(), "flux", nil)