client

package
Version: v1.9.5 Latest Latest
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Published: Sep 30, 2021 License: MIT Imports: 17 Imported by: 3,635

Documentation

Overview

Package client (v2) is the current official Go client for InfluxDB.

Index

Examples

Constants

View Source
const (
	// UDPPayloadSize is a reasonable default payload size for UDP packets that
	// could be travelling over the internet.
	UDPPayloadSize = 512
)

Variables

This section is empty.

Functions

This section is empty.

Types

type BatchPoints

type BatchPoints interface {
	// AddPoint adds the given point to the Batch of points.
	AddPoint(p *Point)
	// AddPoints adds the given points to the Batch of points.
	AddPoints(ps []*Point)
	// Points lists the points in the Batch.
	Points() []*Point

	// Precision returns the currently set precision of this Batch.
	Precision() string
	// SetPrecision sets the precision of this batch.
	SetPrecision(s string) error

	// Database returns the currently set database of this Batch.
	Database() string
	// SetDatabase sets the database of this Batch.
	SetDatabase(s string)

	// WriteConsistency returns the currently set write consistency of this Batch.
	WriteConsistency() string
	// SetWriteConsistency sets the write consistency of this Batch.
	SetWriteConsistency(s string)

	// RetentionPolicy returns the currently set retention policy of this Batch.
	RetentionPolicy() string
	// SetRetentionPolicy sets the retention policy of this Batch.
	SetRetentionPolicy(s string)
}

BatchPoints is an interface into a batched grouping of points to write into InfluxDB together. BatchPoints is NOT thread-safe, you must create a separate batch for each goroutine.

Example

Create a batch and add a point

// Create a new point batch
bp, _ := client.NewBatchPoints(client.BatchPointsConfig{
	Database:  "BumbleBeeTuna",
	Precision: "s",
})

// Create a point and add to batch
tags := map[string]string{"cpu": "cpu-total"}
fields := map[string]interface{}{
	"idle":   10.1,
	"system": 53.3,
	"user":   46.6,
}
pt, err := client.NewPoint("cpu_usage", tags, fields, time.Now())
if err != nil {
	fmt.Println("Error: ", err.Error())
}
bp.AddPoint(pt)
Output:

Example (Setters)

Using the BatchPoints setter functions

// Create a new point batch
bp, _ := client.NewBatchPoints(client.BatchPointsConfig{})
bp.SetDatabase("BumbleBeeTuna")
bp.SetPrecision("ms")

// Create a point and add to batch
tags := map[string]string{"cpu": "cpu-total"}
fields := map[string]interface{}{
	"idle":   10.1,
	"system": 53.3,
	"user":   46.6,
}
pt, err := client.NewPoint("cpu_usage", tags, fields, time.Now())
if err != nil {
	fmt.Println("Error: ", err.Error())
}
bp.AddPoint(pt)
Output:

func NewBatchPoints

func NewBatchPoints(conf BatchPointsConfig) (BatchPoints, error)

NewBatchPoints returns a BatchPoints interface based on the given config.

type BatchPointsConfig

type BatchPointsConfig struct {
	// Precision is the write precision of the points, defaults to "ns".
	Precision string

	// Database is the database to write points to.
	Database string

	// RetentionPolicy is the retention policy of the points.
	RetentionPolicy string

	// Write consistency is the number of servers required to confirm write.
	WriteConsistency string
}

BatchPointsConfig is the config data needed to create an instance of the BatchPoints struct.

type BooleanValue added in v1.8.0

type BooleanValue bool

BooleanValue is a boolean literal.

func (BooleanValue) MarshalJSON added in v1.8.0

func (v BooleanValue) MarshalJSON() ([]byte, error)

type ChunkedResponse added in v1.3.0

type ChunkedResponse struct {
	// contains filtered or unexported fields
}

ChunkedResponse represents a response from the server that uses chunking to stream the output.

func NewChunkedResponse added in v1.3.0

func NewChunkedResponse(r io.Reader) *ChunkedResponse

NewChunkedResponse reads a stream and produces responses from the stream.

func (*ChunkedResponse) Close added in v1.7.0

func (r *ChunkedResponse) Close() error

Close closes the response.

func (*ChunkedResponse) NextResponse added in v1.3.0

func (r *ChunkedResponse) NextResponse() (*Response, error)

NextResponse reads the next line of the stream and returns a response.

type Client

type Client interface {
	// Ping checks that status of cluster, and will always return 0 time and no
	// error for UDP clients.
	Ping(timeout time.Duration) (time.Duration, string, error)

	// Write takes a BatchPoints object and writes all Points to InfluxDB.
	Write(bp BatchPoints) error

	// WriteCtx takes a BatchPoints object and writes all Points to InfluxDB.
	WriteCtx(ctx context.Context, bp BatchPoints) error

	// Query makes an InfluxDB Query on the database. This will fail if using
	// the UDP client.
	Query(q Query) (*Response, error)

	// QueryCtx makes an InfluxDB Query on the database. This will fail if using
	// the UDP client.
	QueryCtx(ctx context.Context, q Query) (*Response, error)

	// QueryAsChunk makes an InfluxDB Query on the database. This will fail if using
	// the UDP client.
	QueryAsChunk(q Query) (*ChunkedResponse, error)

	// Close releases any resources a Client may be using.
	Close() error
}

Client is a client interface for writing & querying the database.

Example

Create a new client

// NOTE: this assumes you've setup a user and have setup shell env variables,
// namely INFLUX_USER/INFLUX_PWD. If not just omit Username/Password below.
_, err := client.NewHTTPClient(client.HTTPConfig{
	Addr:     "http://localhost:8086",
	Username: os.Getenv("INFLUX_USER"),
	Password: os.Getenv("INFLUX_PWD"),
})
if err != nil {
	fmt.Println("Error creating InfluxDB Client: ", err.Error())
}
Output:

Example (CreateDatabase)

Create a Database with a query

// Make client
c, err := client.NewHTTPClient(client.HTTPConfig{
	Addr: "http://localhost:8086",
})
if err != nil {
	fmt.Println("Error creating InfluxDB Client: ", err.Error())
}
defer c.Close()

q := client.NewQuery("CREATE DATABASE telegraf", "", "")
if response, err := c.Query(q); err == nil && response.Error() == nil {
	fmt.Println(response.Results)
}
Output:

Example (Query)

Make a Query

// Make client
c, err := client.NewHTTPClient(client.HTTPConfig{
	Addr: "http://localhost:8086",
})
if err != nil {
	fmt.Println("Error creating InfluxDB Client: ", err.Error())
}
defer c.Close()

q := client.NewQuery("SELECT count(value) FROM shapes", "square_holes", "ns")
if response, err := c.Query(q); err == nil && response.Error() == nil {
	fmt.Println(response.Results)
}
Output:

Example (QueryWithParams)
// Make client
c, err := client.NewHTTPClient(client.HTTPConfig{
	Addr: "http://localhost:8086",
})
if err != nil {
	fmt.Println("Error creating InfluxDB Client: ", err.Error())
}
defer c.Close()

q := client.NewQueryWithParameters("SELECT $fn($value) FROM $m", "square_holes", "ns", client.Params{
	"fn":    client.Identifier("count"),
	"value": client.Identifier("value"),
	"m":     client.Identifier("shapes"),
})
if response, err := c.Query(q); err == nil && response.Error() == nil {
	fmt.Println(response.Results)
}
Output:

Example (UDP)

Write a point using the UDP client

// Make client
config := client.UDPConfig{Addr: "localhost:8089"}
c, err := client.NewUDPClient(config)
if err != nil {
	fmt.Println("Error: ", err.Error())
}
defer c.Close()

// Create a new point batch
bp, _ := client.NewBatchPoints(client.BatchPointsConfig{
	Precision: "s",
})

// Create a point and add to batch
tags := map[string]string{"cpu": "cpu-total"}
fields := map[string]interface{}{
	"idle":   10.1,
	"system": 53.3,
	"user":   46.6,
}
pt, err := client.NewPoint("cpu_usage", tags, fields, time.Now())
if err != nil {
	fmt.Println("Error: ", err.Error())
}
bp.AddPoint(pt)

// Write the batch
c.Write(bp)
Output:

Example (Write)

Write a point using the HTTP client

// Make client
c, err := client.NewHTTPClient(client.HTTPConfig{
	Addr: "http://localhost:8086",
})
if err != nil {
	fmt.Println("Error creating InfluxDB Client: ", err.Error())
}
defer c.Close()

// Create a new point batch
bp, _ := client.NewBatchPoints(client.BatchPointsConfig{
	Database:  "BumbleBeeTuna",
	Precision: "s",
})

// Create a point and add to batch
tags := map[string]string{"cpu": "cpu-total"}
fields := map[string]interface{}{
	"idle":   10.1,
	"system": 53.3,
	"user":   46.6,
}
pt, err := client.NewPoint("cpu_usage", tags, fields, time.Now())
if err != nil {
	fmt.Println("Error: ", err.Error())
}
bp.AddPoint(pt)

// Write the batch
c.Write(bp)
Output:

Example (Write1000)

Write 1000 points

sampleSize := 1000

// Make client
c, err := client.NewHTTPClient(client.HTTPConfig{
	Addr: "http://localhost:8086",
})
if err != nil {
	fmt.Println("Error creating InfluxDB Client: ", err.Error())
}
defer c.Close()

rand.Seed(42)

bp, _ := client.NewBatchPoints(client.BatchPointsConfig{
	Database:  "systemstats",
	Precision: "us",
})

for i := 0; i < sampleSize; i++ {
	regions := []string{"us-west1", "us-west2", "us-west3", "us-east1"}
	tags := map[string]string{
		"cpu":    "cpu-total",
		"host":   fmt.Sprintf("host%d", rand.Intn(1000)),
		"region": regions[rand.Intn(len(regions))],
	}

	idle := rand.Float64() * 100.0
	fields := map[string]interface{}{
		"idle": idle,
		"busy": 100.0 - idle,
	}

	pt, err := client.NewPoint(
		"cpu_usage",
		tags,
		fields,
		time.Now(),
	)
	if err != nil {
		println("Error:", err.Error())
		continue
	}
	bp.AddPoint(pt)
}

err = c.Write(bp)
if err != nil {
	fmt.Println("Error: ", err.Error())
}
Output:

func NewUDPClient

func NewUDPClient(conf UDPConfig) (Client, error)

NewUDPClient returns a client interface for writing to an InfluxDB UDP service from the given config.

type DurationValue added in v1.8.0

type DurationValue time.Duration

DurationValue is a duration literal.

func (DurationValue) MarshalJSON added in v1.8.0

func (v DurationValue) MarshalJSON() ([]byte, error)

type HTTPClient added in v1.9.3

type HTTPClient interface {
	Client
	WriteRawCtx(ctx context.Context, bp BatchPoints, reqBody io.Reader) error
}

For added performance users may want to send pre-serialized points.

func NewHTTPClient

func NewHTTPClient(conf HTTPConfig) (HTTPClient, error)

NewHTTPClient returns a new Client from the provided config. Client is safe for concurrent use by multiple goroutines.

type HTTPConfig

type HTTPConfig struct {
	// Addr should be of the form "http://host:port"
	// or "http://[ipv6-host%zone]:port".
	Addr string

	// Username is the influxdb username, optional.
	Username string

	// Password is the influxdb password, optional.
	Password string

	// UserAgent is the http User Agent, defaults to "InfluxDBClient".
	UserAgent string

	// Timeout for influxdb writes, defaults to no timeout.
	Timeout time.Duration

	// InsecureSkipVerify gets passed to the http client, if true, it will
	// skip https certificate verification. Defaults to false.
	InsecureSkipVerify bool

	// TLSConfig allows the user to set their own TLS config for the HTTP
	// Client. If set, this option overrides InsecureSkipVerify.
	TLSConfig *tls.Config

	// Proxy configures the Proxy function on the HTTP client.
	Proxy func(req *http.Request) (*url.URL, error)

	// DialContext specifies the dial function for creating unencrypted TCP connections.
	// If DialContext is nil then the transport dials using package net.
	DialContext func(ctx context.Context, network, addr string) (net.Conn, error)
}

HTTPConfig is the config data needed to create an HTTP Client.

type Identifier added in v1.8.0

type Identifier string

Identifier is an identifier value.

func (Identifier) MarshalJSON added in v1.8.0

func (v Identifier) MarshalJSON() ([]byte, error)

type IntegerValue added in v1.8.0

type IntegerValue int64

IntegerValue is an integer literal.

func (IntegerValue) MarshalJSON added in v1.8.0

func (v IntegerValue) MarshalJSON() ([]byte, error)

type Message added in v0.13.0

type Message struct {
	Level string
	Text  string
}

Message represents a user message.

type NumberValue added in v1.8.0

type NumberValue float64

NumberValue is a number literal.

func (NumberValue) MarshalJSON added in v1.8.0

func (v NumberValue) MarshalJSON() ([]byte, error)

type Params added in v1.8.0

type Params map[string]interface{}

Params is a type alias to the query parameters.

type Point

type Point struct {
	// contains filtered or unexported fields
}

Point represents a single data point.

Example

Create a new point with a timestamp

tags := map[string]string{"cpu": "cpu-total"}
fields := map[string]interface{}{
	"idle":   10.1,
	"system": 53.3,
	"user":   46.6,
}
pt, err := client.NewPoint("cpu_usage", tags, fields, time.Now())
if err == nil {
	fmt.Println("We created a point: ", pt.String())
}
Output:

Example (WithoutTime)

Create a new point without a timestamp

tags := map[string]string{"cpu": "cpu-total"}
fields := map[string]interface{}{
	"idle":   10.1,
	"system": 53.3,
	"user":   46.6,
}
pt, err := client.NewPoint("cpu_usage", tags, fields)
if err == nil {
	fmt.Println("We created a point w/o time: ", pt.String())
}
Output:

func NewPoint

func NewPoint(
	name string,
	tags map[string]string,
	fields map[string]interface{},
	t ...time.Time,
) (*Point, error)

NewPoint returns a point with the given timestamp. If a timestamp is not given, then data is sent to the database without a timestamp, in which case the server will assign local time upon reception. NOTE: it is recommended to send data with a timestamp.

func NewPointFrom added in v0.12.0

func NewPointFrom(pt models.Point) *Point

NewPointFrom returns a point from the provided models.Point.

func (*Point) Fields

func (p *Point) Fields() (map[string]interface{}, error)

Fields returns the fields for the point.

func (*Point) Name

func (p *Point) Name() string

Name returns the measurement name of the point.

func (*Point) PrecisionString

func (p *Point) PrecisionString(precision string) string

PrecisionString returns a line-protocol string of the Point, with the timestamp formatted for the given precision.

func (*Point) String

func (p *Point) String() string

String returns a line-protocol string of the Point.

func (*Point) Tags

func (p *Point) Tags() map[string]string

Tags returns the tags associated with the point.

func (*Point) Time

func (p *Point) Time() time.Time

Time return the timestamp for the point.

func (*Point) UnixNano

func (p *Point) UnixNano() int64

UnixNano returns timestamp of the point in nanoseconds since Unix epoch.

type Query

type Query struct {
	Command         string
	Database        string
	RetentionPolicy string
	Precision       string
	Chunked         bool
	ChunkSize       int
	Parameters      map[string]interface{}
}

Query defines a query to send to the server.

func NewQuery

func NewQuery(command, database, precision string) Query

NewQuery returns a query object. The database and precision arguments can be empty strings if they are not needed for the query.

func NewQueryWithParameters added in v1.2.0

func NewQueryWithParameters(command, database, precision string, parameters map[string]interface{}) Query

NewQueryWithParameters returns a query object. The database and precision arguments can be empty strings if they are not needed for the query. parameters is a map of the parameter names used in the command to their values.

func NewQueryWithRP added in v1.6.0

func NewQueryWithRP(command, database, retentionPolicy, precision string) Query

NewQueryWithRP returns a query object. The database, retention policy, and precision arguments can be empty strings if they are not needed for the query. Setting the retention policy only works on InfluxDB versions 1.6 or greater.

type RegexValue added in v1.8.0

type RegexValue string

RegexValue is a regexp literal.

func (RegexValue) MarshalJSON added in v1.8.0

func (v RegexValue) MarshalJSON() ([]byte, error)

type Response

type Response struct {
	Results []Result
	Err     string `json:"error,omitempty"`
}

Response represents a list of statement results.

func (*Response) Error

func (r *Response) Error() error

Error returns the first error from any statement. It returns nil if no errors occurred on any statements.

type Result

type Result struct {
	Series   []models.Row
	Messages []*Message
	Err      string `json:"error,omitempty"`
}

Result represents a resultset returned from a single statement.

type StringValue added in v1.8.0

type StringValue string

StringValue is a string literal.

func (StringValue) MarshalJSON added in v1.8.0

func (v StringValue) MarshalJSON() ([]byte, error)

type TimeValue added in v1.8.0

type TimeValue time.Time

TimeValue is a time literal.

func (TimeValue) MarshalJSON added in v1.8.0

func (v TimeValue) MarshalJSON() ([]byte, error)

type UDPConfig

type UDPConfig struct {
	// Addr should be of the form "host:port"
	// or "[ipv6-host%zone]:port".
	Addr string

	// PayloadSize is the maximum size of a UDP client message, optional
	// Tune this based on your network. Defaults to UDPPayloadSize.
	PayloadSize int
}

UDPConfig is the config data needed to create a UDP Client.

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