Fix InfluxDB write support to work with InfluxDB 0.9.x.

Because the InfluxDB client library currently pulls in multiple MBs of
unnecessary dependencies, I have modified and cut up the vendored
version to only pull in the few pieces that are actually needed.

On InfluxDB's side, this dependency issue is tracked in:

https://github.com/influxdb/influxdb/issues/3447

Hopefully, it will be resolved soon.

If a password is needed for InfluxDB, it may be supplied via the
INFLUXDB_PW environment variable.

cmd/prometheus/config.go

@@ -48,6 +48,7 @@ var cfg = struct {
 	remote       remote.Options
 
 	prometheusURL string
+	influxdbURL   string
 }{}
 
 func init() {
@@ -167,13 +168,17 @@ func init() {
 		"The URL of the remote OpenTSDB server to send samples to. None, if empty.",
 	)
 	cfg.fs.StringVar(
-		&cfg.remote.InfluxdbURL, "storage.remote.influxdb-url", "",
+		&cfg.influxdbURL, "storage.remote.influxdb-url", "",
 		"The URL of the remote InfluxDB server to send samples to. None, if empty.",
 	)
 	cfg.fs.StringVar(
 		&cfg.remote.InfluxdbRetentionPolicy, "storage.remote.influxdb.retention-policy", "default",
 		"The InfluxDB retention policy to use.",
 	)
+	cfg.fs.StringVar(
+		&cfg.remote.InfluxdbUsername, "storage.remote.influxdb.username", "",
+		"The username to use when sending samples to InfluxDB.",
+	)
 	cfg.fs.StringVar(
 		&cfg.remote.InfluxdbDatabase, "storage.remote.influxdb.database", "prometheus",
 		"The name of the database to use for storing samples in InfluxDB.",
@@ -221,6 +226,20 @@ func parse(args []string) error {
 		return err
 	}
 
+	if err := parsePrometheusURL(); err != nil {
+		return err
+	}
+
+	if err := parseInfluxdbURL(); err != nil {
+		return err
+	}
+
+	cfg.remote.InfluxdbPassword = os.Getenv("INFLUXDB_PW")
+
+	return nil
+}
+
+func parsePrometheusURL() error {
 	if cfg.prometheusURL == "" {
 		hostname, err := os.Hostname()
 		if err != nil {
@@ -244,7 +263,20 @@ func parse(args []string) error {
 		ppref = "/" + ppref
 	}
 	cfg.web.ExternalURL.Path = ppref
+	return nil
+}
 
+func parseInfluxdbURL() error {
+	if cfg.influxdbURL == "" {
+		return nil
+	}
+
+	url, err := url.Parse(cfg.influxdbURL)
+	if err != nil {
+		return err
+	}
+
+	cfg.remote.InfluxdbURL = url
 	return nil
 }
 

storage/remote/influxdb/client.go

@@ -14,148 +14,96 @@
 package influxdb
 
 import (
-	"bytes"
-	"encoding/json"
-	"fmt"
-	"io/ioutil"
 	"math"
-	"net/http"
-	"net/url"
-	"time"
 
+	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/common/model"
 	"github.com/prometheus/log"
 
-	"github.com/prometheus/prometheus/util/httputil"
-)
-
-const (
-	writeEndpoint   = "/write"
-	contentTypeJSON = "application/json"
+	influx "github.com/influxdb/influxdb/client"
 )
 
 // Client allows sending batches of Prometheus samples to InfluxDB.
 type Client struct {
-	url             string
-	httpClient      *http.Client
-	retentionPolicy string
+	client          *influx.Client
 	database        string
+	retentionPolicy string
+	ignoredSamples  prometheus.Counter
 }
 
 // NewClient creates a new Client.
-func NewClient(url string, timeout time.Duration, database, retentionPolicy string) *Client {
+func NewClient(conf influx.Config, db string, rp string) *Client {
+	c, err := influx.NewClient(conf)
+	// Currently influx.NewClient() *should* never return an error.
+	if err != nil {
+		log.Fatal(err)
+	}
+
 	return &Client{
-		url:             url,
-		httpClient:      httputil.NewDeadlineClient(timeout, nil),
-		retentionPolicy: retentionPolicy,
-		database:        database,
+		client:          c,
+		database:        db,
+		retentionPolicy: rp,
+		ignoredSamples: prometheus.NewCounter(
+			prometheus.CounterOpts{
+				Name: "prometheus_influxdb_ignored_samples_total",
+				Help: "The total number of samples not sent to InfluxDB due to unsupported float values (Inf, -Inf, NaN).",
+			},
+		),
 	}
 }
 
-// StoreSamplesRequest is used for building a JSON request for storing samples
-// in InfluxDB.
-type StoreSamplesRequest struct {
-	Database        string  `json:"database"`
-	RetentionPolicy string  `json:"retentionPolicy"`
-	Points          []point `json:"points"`
-}
-
-// point represents a single InfluxDB measurement.
-type point struct {
-	Timestamp int64            `json:"timestamp"`
-	Precision string           `json:"precision"`
-	Name      model.LabelValue `json:"name"`
-	Tags      model.LabelSet   `json:"tags"`
-	Fields    fields           `json:"fields"`
-}
-
-// fields represents the fields/columns sent to InfluxDB for a given measurement.
-type fields struct {
-	Value model.SampleValue `json:"value"`
-}
-
 // tagsFromMetric extracts InfluxDB tags from a Prometheus metric.
-func tagsFromMetric(m model.Metric) model.LabelSet {
-	tags := make(model.LabelSet, len(m)-1)
+func tagsFromMetric(m model.Metric) map[string]string {
+	tags := make(map[string]string, len(m)-1)
 	for l, v := range m {
-		if l == model.MetricNameLabel {
-			continue
+		if l != model.MetricNameLabel {
+			tags[string(l)] = string(v)
 		}
-		tags[l] = v
 	}
 	return tags
 }
 
 // Store sends a batch of samples to InfluxDB via its HTTP API.
 func (c *Client) Store(samples model.Samples) error {
-	points := make([]point, 0, len(samples))
+	points := make([]influx.Point, 0, len(samples))
 	for _, s := range samples {
 		v := float64(s.Value)
 		if math.IsNaN(v) || math.IsInf(v, 0) {
-			// TODO(julius): figure out if it's possible to insert special float
-			// values into InfluxDB somehow.
-			log.Warnf("cannot send value %f to InfluxDB, skipping sample %#v", v, s)
+			log.Debugf("cannot send value %f to InfluxDB, skipping sample %#v", v, s)
+			c.ignoredSamples.Inc()
 			continue
 		}
-		metric := s.Metric[model.MetricNameLabel]
-		points = append(points, point{
-			Timestamp: s.Timestamp.UnixNano(),
-			Precision: "n",
-			Name:      metric,
-			Tags:      tagsFromMetric(s.Metric),
-			Fields: fields{
-				Value: s.Value,
+		points = append(points, influx.Point{
+			Measurement: string(s.Metric[model.MetricNameLabel]),
+			Tags:        tagsFromMetric(s.Metric),
+			Time:        s.Timestamp.Time(),
+			Precision:   "ms",
+			Fields: map[string]interface{}{
+				"value": v,
 			},
 		})
 	}
 
-	u, err := url.Parse(c.url)
-	if err != nil {
-		return err
-	}
-
-	u.Path = writeEndpoint
-
-	req := StoreSamplesRequest{
+	bps := influx.BatchPoints{
+		Points:          points,
 		Database:        c.database,
 		RetentionPolicy: c.retentionPolicy,
-		Points:          points,
 	}
-	buf, err := json.Marshal(req)
-	if err != nil {
-		return err
-	}
-
-	resp, err := c.httpClient.Post(
-		u.String(),
-		contentTypeJSON,
-		bytes.NewBuffer(buf),
-	)
-	if err != nil {
-		return err
-	}
-	defer resp.Body.Close()
-
-	// API returns status code 200 for successful writes.
-	// http://influxdb.com/docs/v0.9/concepts/reading_and_writing_data.html#response
-	if resp.StatusCode == http.StatusOK {
-		return nil
-	}
-
-	// API returns error details in the response content in JSON.
-	buf, err = ioutil.ReadAll(resp.Body)
-	if err != nil {
-		return err
-	}
-
-	var r map[string]string
-	if err := json.Unmarshal(buf, &r); err != nil {
-		return err
-	}
-	return fmt.Errorf("failed to write samples into InfluxDB. Error: %s", r["error"])
+	_, err := c.client.Write(bps)
+	return err
 }
 
 // Name identifies the client as an InfluxDB client.
 func (c Client) Name() string {
 	return "influxdb"
 }
+
+// Describe implements prometheus.Collector.
+func (c *Client) Describe(ch chan<- *prometheus.Desc) {
+	ch <- c.ignoredSamples.Desc()
+}
+
+// Collect implements prometheus.Collector.
+func (c *Client) Collect(ch chan<- prometheus.Metric) {
+	ch <- c.ignoredSamples
+}

storage/remote/influxdb/client_test.go

@@ -18,9 +18,12 @@ import (
 	"math"
 	"net/http"
 	"net/http/httptest"
+	"net/url"
 	"testing"
 	"time"
 
+	influx "github.com/influxdb/influxdb/client"
+
 	"github.com/prometheus/common/model"
 )
 
@@ -44,43 +47,63 @@ func TestClient(t *testing.T) {
 		},
 		{
 			Metric: model.Metric{
-				model.MetricNameLabel: "special_float_value",
+				model.MetricNameLabel: "nan_value",
 			},
 			Timestamp: model.Time(123456789123),
 			Value:     model.SampleValue(math.NaN()),
 		},
+		{
+			Metric: model.Metric{
+				model.MetricNameLabel: "pos_inf_value",
+			},
+			Timestamp: model.Time(123456789123),
+			Value:     model.SampleValue(math.Inf(1)),
+		},
+		{
+			Metric: model.Metric{
+				model.MetricNameLabel: "neg_inf_value",
+			},
+			Timestamp: model.Time(123456789123),
+			Value:     model.SampleValue(math.Inf(-1)),
+		},
 	}
 
-	expectedJSON := `{"database":"prometheus","retentionPolicy":"default","points":[{"timestamp":123456789123000000,"precision":"n","name":"testmetric","tags":{"test_label":"test_label_value1"},"fields":{"value":"1.23"}},{"timestamp":123456789123000000,"precision":"n","name":"testmetric","tags":{"test_label":"test_label_value2"},"fields":{"value":"5.1234"}}]}`
+	expectedBody := `testmetric,test_label=test_label_value1 value=1.23 123456789123000000
+testmetric,test_label=test_label_value2 value=5.1234 123456789123000000
+`
 
 	server := httptest.NewServer(http.HandlerFunc(
 		func(w http.ResponseWriter, r *http.Request) {
 			if r.Method != "POST" {
 				t.Fatalf("Unexpected method; expected POST, got %s", r.Method)
 			}
-			if r.URL.Path != writeEndpoint {
-				t.Fatalf("Unexpected path; expected %s, got %s", writeEndpoint, r.URL.Path)
-			}
-			ct := r.Header["Content-Type"]
-			if len(ct) != 1 {
-				t.Fatalf("Unexpected number of 'Content-Type' headers; got %d, want 1", len(ct))
-			}
-			if ct[0] != contentTypeJSON {
-				t.Fatalf("Unexpected 'Content-type'; expected %s, got %s", contentTypeJSON, ct[0])
+			if r.URL.Path != "/write" {
+				t.Fatalf("Unexpected path; expected %s, got %s", "/write", r.URL.Path)
 			}
 			b, err := ioutil.ReadAll(r.Body)
 			if err != nil {
 				t.Fatalf("Error reading body: %s", err)
 			}
 
-			if string(b) != expectedJSON {
-				t.Fatalf("Unexpected request body; expected:\n\n%s\n\ngot:\n\n%s", expectedJSON, string(b))
+			if string(b) != expectedBody {
+				t.Fatalf("Unexpected request body; expected:\n\n%s\n\ngot:\n\n%s", expectedBody, string(b))
 			}
 		},
 	))
 	defer server.Close()
 
-	c := NewClient(server.URL, time.Minute, "prometheus", "default")
+	serverURL, err := url.Parse(server.URL)
+	if err != nil {
+		t.Fatalf("Unable to parse server URL %s: %s", server.URL, err)
+	}
+
+	conf := influx.Config{
+		URL:      *serverURL,
+		Username: "testuser",
+		Password: "testpass",
+		Timeout:  time.Minute,
+	}
+	c := NewClient(conf, "test_db", "default")
 
 	if err := c.Store(samples); err != nil {
 		t.Fatalf("Error sending samples: %s", err)

storage/remote/remote.go

@@ -14,12 +14,15 @@
 package remote
 
 import (
+	"net/url"
 	"sync"
 	"time"
 
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/common/model"
 
+	influx "github.com/influxdb/influxdb/client"
+
 	"github.com/prometheus/prometheus/config"
 	"github.com/prometheus/prometheus/storage/remote/influxdb"
 	"github.com/prometheus/prometheus/storage/remote/opentsdb"
@@ -49,8 +52,15 @@ func New(o *Options) *Storage {
 		c := opentsdb.NewClient(o.OpentsdbURL, o.StorageTimeout)
 		s.queues = append(s.queues, NewStorageQueueManager(c, 100*1024))
 	}
-	if o.InfluxdbURL != "" {
-		c := influxdb.NewClient(o.InfluxdbURL, o.StorageTimeout, o.InfluxdbDatabase, o.InfluxdbRetentionPolicy)
+	if o.InfluxdbURL != nil {
+		conf := influx.Config{
+			URL:      *o.InfluxdbURL,
+			Username: o.InfluxdbUsername,
+			Password: o.InfluxdbPassword,
+			Timeout:  o.StorageTimeout,
+		}
+		c := influxdb.NewClient(conf, o.InfluxdbDatabase, o.InfluxdbRetentionPolicy)
+		prometheus.MustRegister(c)
 		s.queues = append(s.queues, NewStorageQueueManager(c, 100*1024))
 	}
 	if len(s.queues) == 0 {
@@ -62,8 +72,10 @@ func New(o *Options) *Storage {
 // Options contains configuration parameters for a remote storage.
 type Options struct {
 	StorageTimeout          time.Duration
-	InfluxdbURL             string
+	InfluxdbURL             *url.URL
 	InfluxdbRetentionPolicy string
+	InfluxdbUsername        string
+	InfluxdbPassword        string
 	InfluxdbDatabase        string
 	OpentsdbURL             string
 }

vendor/github.com/influxdb/influxdb/client/influxdb.go

@@ -0,0 +1,180 @@
+package client
+
+import (
+	"bytes"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"net/url"
+	"time"
+
+	"github.com/influxdb/influxdb/tsdb"
+)
+
+const (
+	// DefaultTimeout is the default connection timeout used to connect to an InfluxDB instance
+	DefaultTimeout = 0
+)
+
+// Config is used to specify what server to connect to.
+// URL: The URL of the server connecting to.
+// Username/Password are optional.  They will be passed via basic auth if provided.
+// UserAgent: If not provided, will default "InfluxDBClient",
+// Timeout: If not provided, will default to 0 (no timeout)
+type Config struct {
+	URL       url.URL
+	Username  string
+	Password  string
+	UserAgent string
+	Timeout   time.Duration
+	Precision string
+}
+
+// NewConfig will create a config to be used in connecting to the client
+func NewConfig() Config {
+	return Config{
+		Timeout: DefaultTimeout,
+	}
+}
+
+// Client is used to make calls to the server.
+type Client struct {
+	url        url.URL
+	username   string
+	password   string
+	httpClient *http.Client
+	userAgent  string
+	precision  string
+}
+
+const (
+	ConsistencyOne    = "one"
+	ConsistencyAll    = "all"
+	ConsistencyQuorum = "quorum"
+	ConsistencyAny    = "any"
+)
+
+// NewClient will instantiate and return a connected client to issue commands to the server.
+func NewClient(c Config) (*Client, error) {
+	client := Client{
+		url:        c.URL,
+		username:   c.Username,
+		password:   c.Password,
+		httpClient: &http.Client{Timeout: c.Timeout},
+		userAgent:  c.UserAgent,
+		precision:  c.Precision,
+	}
+	if client.userAgent == "" {
+		client.userAgent = "InfluxDBClient"
+	}
+	return &client, nil
+}
+
+// Write takes BatchPoints and allows for writing of multiple points with defaults
+// If successful, error is nil and Response is nil
+// If an error occurs, Response may contain additional information if populated.
+func (c *Client) Write(bp BatchPoints) (*Response, error) {
+	u := c.url
+	u.Path = "write"
+
+	var b bytes.Buffer
+	for _, p := range bp.Points {
+		if p.Raw != "" {
+			if _, err := b.WriteString(p.Raw); err != nil {
+				return nil, err
+			}
+		} else {
+			for k, v := range bp.Tags {
+				if p.Tags == nil {
+					p.Tags = make(map[string]string, len(bp.Tags))
+				}
+				p.Tags[k] = v
+			}
+
+			if _, err := b.WriteString(p.MarshalString()); err != nil {
+				return nil, err
+			}
+		}
+
+		if err := b.WriteByte('\n'); err != nil {
+			return nil, err
+		}
+	}
+
+	req, err := http.NewRequest("POST", u.String(), &b)
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("Content-Type", "")
+	req.Header.Set("User-Agent", c.userAgent)
+	if c.username != "" {
+		req.SetBasicAuth(c.username, c.password)
+	}
+	params := req.URL.Query()
+	params.Set("db", bp.Database)
+	params.Set("rp", bp.RetentionPolicy)
+	params.Set("precision", bp.Precision)
+	params.Set("consistency", bp.WriteConsistency)
+	req.URL.RawQuery = params.Encode()
+
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	var response Response
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	if resp.StatusCode != http.StatusNoContent && resp.StatusCode != http.StatusOK {
+		var err = fmt.Errorf(string(body))
+		response.Err = err
+		return &response, err
+	}
+
+	return nil, nil
+}
+
+// Structs
+
+// Response represents a list of statement results.
+type Response struct {
+	Err error
+}
+
+// Point defines the fields that will be written to the database
+// Measurement, Time, and Fields are required
+// Precision can be specified if the time is in epoch format (integer).
+// Valid values for Precision are n, u, ms, s, m, and h
+type Point struct {
+	Measurement string
+	Tags        map[string]string
+	Time        time.Time
+	Fields      map[string]interface{}
+	Precision   string
+	Raw         string
+}
+
+func (p *Point) MarshalString() string {
+	return tsdb.NewPoint(p.Measurement, p.Tags, p.Fields, p.Time).String()
+}
+
+// BatchPoints is used to send batched data in a single write.
+// Database and Points are required
+// If no retention policy is specified, it will use the databases default retention policy.
+// If tags are specified, they will be "merged" with all points.  If a point already has that tag, it is ignored.
+// If time is specified, it will be applied to any point with an empty time.
+// Precision can be specified if the time is in epoch format (integer).
+// Valid values for Precision are n, u, ms, s, m, and h
+type BatchPoints struct {
+	Points           []Point           `json:"points,omitempty"`
+	Database         string            `json:"database,omitempty"`
+	RetentionPolicy  string            `json:"retentionPolicy,omitempty"`
+	Tags             map[string]string `json:"tags,omitempty"`
+	Time             time.Time         `json:"time,omitempty"`
+	Precision        string            `json:"precision,omitempty"`
+	WriteConsistency string            `json:"-"`
+}

vendor/vendor.json

@@ -32,6 +32,16 @@
 			"revision": "34f98f7bdf2eec7517e3aac44691566963152721",
 			"revisionTime": "2015-09-08T11:01:49-04:00"
 		},
+		{
+			"path": "github.com/influxdb/influxdb/client",
+			"revision": "291aaeb9485b43b16875c238482b2f7d0a22a13b",
+			"revisionTime": "2015-09-16T14:41:53+02:00"
+		},
+		{
+			"path": "github.com/influxdb/influxdb/tsdb",
+			"revision": "291aaeb9485b43b16875c238482b2f7d0a22a13b",
+			"revisionTime": "2015-09-16T14:41:53+02:00"
+		},
 		{
 			"path": "github.com/julienschmidt/httprouter",
 			"revision": "109e267447e95ad1bb48b758e40dd7453eb7b039",
@@ -163,4 +173,4 @@
 			"revisionTime": "2015-06-24T11:29:02+01:00"
 		}
 	]
-}
+}