716 lines
18 KiB
Go
716 lines
18 KiB
Go
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package client
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import (
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"bytes"
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"crypto/tls"
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"encoding/json"
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"errors"
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"fmt"
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"io/ioutil"
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"net"
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"net/http"
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"net/url"
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"strconv"
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"strings"
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"time"
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"github.com/influxdata/influxdb/models"
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)
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const (
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// DefaultHost is the default host used to connect to an InfluxDB instance
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DefaultHost = "localhost"
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// DefaultPort is the default port used to connect to an InfluxDB instance
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DefaultPort = 8086
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// DefaultTimeout is the default connection timeout used to connect to an InfluxDB instance
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DefaultTimeout = 0
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)
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// Query is used to send a command to the server. Both Command and Database are required.
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type Query struct {
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Command string
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Database string
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}
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// ParseConnectionString will parse a string to create a valid connection URL
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func ParseConnectionString(path string, ssl bool) (url.URL, error) {
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var host string
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var port int
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h, p, err := net.SplitHostPort(path)
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if err != nil {
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if path == "" {
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host = DefaultHost
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} else {
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host = path
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}
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// If they didn't specify a port, always use the default port
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port = DefaultPort
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} else {
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host = h
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port, err = strconv.Atoi(p)
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if err != nil {
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return url.URL{}, fmt.Errorf("invalid port number %q: %s\n", path, err)
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}
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}
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u := url.URL{
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Scheme: "http",
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}
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if ssl {
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u.Scheme = "https"
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}
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u.Host = net.JoinHostPort(host, strconv.Itoa(port))
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return u, nil
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}
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// Config is used to specify what server to connect to.
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// URL: The URL of the server connecting to.
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// Username/Password are optional. They will be passed via basic auth if provided.
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// UserAgent: If not provided, will default "InfluxDBClient",
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// Timeout: If not provided, will default to 0 (no timeout)
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type Config struct {
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URL url.URL
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Username string
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Password string
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UserAgent string
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Timeout time.Duration
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Precision string
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UnsafeSsl bool
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}
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// NewConfig will create a config to be used in connecting to the client
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func NewConfig() Config {
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return Config{
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Timeout: DefaultTimeout,
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}
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}
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// Client is used to make calls to the server.
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type Client struct {
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url url.URL
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username string
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password string
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httpClient *http.Client
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userAgent string
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precision string
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}
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const (
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// ConsistencyOne requires at least one data node acknowledged a write.
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ConsistencyOne = "one"
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// ConsistencyAll requires all data nodes to acknowledge a write.
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ConsistencyAll = "all"
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// ConsistencyQuorum requires a quorum of data nodes to acknowledge a write.
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ConsistencyQuorum = "quorum"
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// ConsistencyAny allows for hinted hand off, potentially no write happened yet.
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ConsistencyAny = "any"
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)
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// NewClient will instantiate and return a connected client to issue commands to the server.
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func NewClient(c Config) (*Client, error) {
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tlsConfig := &tls.Config{
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InsecureSkipVerify: c.UnsafeSsl,
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}
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tr := &http.Transport{
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TLSClientConfig: tlsConfig,
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}
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client := Client{
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url: c.URL,
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username: c.Username,
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password: c.Password,
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httpClient: &http.Client{Timeout: c.Timeout, Transport: tr},
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userAgent: c.UserAgent,
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precision: c.Precision,
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}
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if client.userAgent == "" {
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client.userAgent = "InfluxDBClient"
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}
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return &client, nil
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}
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// SetAuth will update the username and passwords
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func (c *Client) SetAuth(u, p string) {
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c.username = u
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c.password = p
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}
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// SetPrecision will update the precision
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func (c *Client) SetPrecision(precision string) {
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c.precision = precision
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}
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// Query sends a command to the server and returns the Response
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func (c *Client) Query(q Query) (*Response, error) {
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u := c.url
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u.Path = "query"
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values := u.Query()
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values.Set("q", q.Command)
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values.Set("db", q.Database)
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if c.precision != "" {
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values.Set("epoch", c.precision)
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}
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u.RawQuery = values.Encode()
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req, err := http.NewRequest("GET", u.String(), nil)
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if err != nil {
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return nil, err
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}
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req.Header.Set("User-Agent", c.userAgent)
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if c.username != "" {
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req.SetBasicAuth(c.username, c.password)
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}
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resp, err := c.httpClient.Do(req)
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if err != nil {
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return nil, err
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}
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defer resp.Body.Close()
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var response Response
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dec := json.NewDecoder(resp.Body)
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dec.UseNumber()
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decErr := dec.Decode(&response)
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// ignore this error if we got an invalid status code
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if decErr != nil && decErr.Error() == "EOF" && resp.StatusCode != http.StatusOK {
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decErr = nil
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}
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// If we got a valid decode error, send that back
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if decErr != nil {
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return nil, decErr
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}
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// If we don't have an error in our json response, and didn't get StatusOK, then send back an error
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if resp.StatusCode != http.StatusOK && response.Error() == nil {
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return &response, fmt.Errorf("received status code %d from server", resp.StatusCode)
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}
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return &response, nil
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}
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// Write takes BatchPoints and allows for writing of multiple points with defaults
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// If successful, error is nil and Response is nil
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// If an error occurs, Response may contain additional information if populated.
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func (c *Client) Write(bp BatchPoints) (*Response, error) {
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u := c.url
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u.Path = "write"
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var b bytes.Buffer
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for _, p := range bp.Points {
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err := checkPointTypes(p)
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if err != nil {
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return nil, err
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}
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if p.Raw != "" {
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if _, err := b.WriteString(p.Raw); err != nil {
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return nil, err
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}
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} else {
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for k, v := range bp.Tags {
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if p.Tags == nil {
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p.Tags = make(map[string]string, len(bp.Tags))
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}
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p.Tags[k] = v
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}
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if _, err := b.WriteString(p.MarshalString()); err != nil {
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return nil, err
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}
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}
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if err := b.WriteByte('\n'); err != nil {
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return nil, err
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}
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}
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req, err := http.NewRequest("POST", u.String(), &b)
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if err != nil {
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return nil, err
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}
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req.Header.Set("Content-Type", "")
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req.Header.Set("User-Agent", c.userAgent)
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if c.username != "" {
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req.SetBasicAuth(c.username, c.password)
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}
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precision := bp.Precision
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if precision == "" {
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precision = c.precision
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}
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params := req.URL.Query()
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params.Set("db", bp.Database)
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params.Set("rp", bp.RetentionPolicy)
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params.Set("precision", precision)
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params.Set("consistency", bp.WriteConsistency)
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req.URL.RawQuery = params.Encode()
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resp, err := c.httpClient.Do(req)
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if err != nil {
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return nil, err
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}
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defer resp.Body.Close()
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var response Response
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body, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return nil, err
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}
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if resp.StatusCode != http.StatusNoContent && resp.StatusCode != http.StatusOK {
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var err = fmt.Errorf(string(body))
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response.Err = err
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return &response, err
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}
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return nil, nil
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}
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// WriteLineProtocol takes a string with line returns to delimit each write
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// If successful, error is nil and Response is nil
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// If an error occurs, Response may contain additional information if populated.
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func (c *Client) WriteLineProtocol(data, database, retentionPolicy, precision, writeConsistency string) (*Response, error) {
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u := c.url
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u.Path = "write"
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r := strings.NewReader(data)
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req, err := http.NewRequest("POST", u.String(), r)
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if err != nil {
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return nil, err
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}
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req.Header.Set("Content-Type", "")
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req.Header.Set("User-Agent", c.userAgent)
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if c.username != "" {
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req.SetBasicAuth(c.username, c.password)
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}
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params := req.URL.Query()
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params.Set("db", database)
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params.Set("rp", retentionPolicy)
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params.Set("precision", precision)
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params.Set("consistency", writeConsistency)
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req.URL.RawQuery = params.Encode()
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resp, err := c.httpClient.Do(req)
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if err != nil {
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return nil, err
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}
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defer resp.Body.Close()
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var response Response
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body, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return nil, err
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}
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if resp.StatusCode != http.StatusNoContent && resp.StatusCode != http.StatusOK {
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err := fmt.Errorf(string(body))
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response.Err = err
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return &response, err
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}
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return nil, nil
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}
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// Ping will check to see if the server is up
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// Ping returns how long the request took, the version of the server it connected to, and an error if one occurred.
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func (c *Client) Ping() (time.Duration, string, error) {
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now := time.Now()
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u := c.url
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u.Path = "ping"
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req, err := http.NewRequest("GET", u.String(), nil)
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if err != nil {
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return 0, "", err
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}
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req.Header.Set("User-Agent", c.userAgent)
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if c.username != "" {
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req.SetBasicAuth(c.username, c.password)
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}
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resp, err := c.httpClient.Do(req)
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if err != nil {
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return 0, "", err
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}
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defer resp.Body.Close()
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version := resp.Header.Get("X-Influxdb-Version")
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return time.Since(now), version, nil
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}
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// Structs
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// Result represents a resultset returned from a single statement.
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type Result struct {
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Series []models.Row
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Err error
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}
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// MarshalJSON encodes the result into JSON.
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func (r *Result) MarshalJSON() ([]byte, error) {
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// Define a struct that outputs "error" as a string.
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var o struct {
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Series []models.Row `json:"series,omitempty"`
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Err string `json:"error,omitempty"`
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}
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// Copy fields to output struct.
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o.Series = r.Series
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if r.Err != nil {
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o.Err = r.Err.Error()
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}
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return json.Marshal(&o)
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}
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// UnmarshalJSON decodes the data into the Result struct
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func (r *Result) UnmarshalJSON(b []byte) error {
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var o struct {
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Series []models.Row `json:"series,omitempty"`
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Err string `json:"error,omitempty"`
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}
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dec := json.NewDecoder(bytes.NewBuffer(b))
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dec.UseNumber()
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err := dec.Decode(&o)
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if err != nil {
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return err
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}
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r.Series = o.Series
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if o.Err != "" {
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r.Err = errors.New(o.Err)
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}
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return nil
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}
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// Response represents a list of statement results.
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type Response struct {
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Results []Result
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Err error
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}
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// MarshalJSON encodes the response into JSON.
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func (r *Response) MarshalJSON() ([]byte, error) {
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// Define a struct that outputs "error" as a string.
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var o struct {
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Results []Result `json:"results,omitempty"`
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Err string `json:"error,omitempty"`
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}
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// Copy fields to output struct.
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o.Results = r.Results
|
||
|
|
if r.Err != nil {
|
||
|
|
o.Err = r.Err.Error()
|
||
|
|
}
|
||
|
|
|
||
|
|
return json.Marshal(&o)
|
||
|
|
}
|
||
|
|
|
||
|
|
// UnmarshalJSON decodes the data into the Response struct
|
||
|
|
func (r *Response) UnmarshalJSON(b []byte) error {
|
||
|
|
var o struct {
|
||
|
|
Results []Result `json:"results,omitempty"`
|
||
|
|
Err string `json:"error,omitempty"`
|
||
|
|
}
|
||
|
|
|
||
|
|
dec := json.NewDecoder(bytes.NewBuffer(b))
|
||
|
|
dec.UseNumber()
|
||
|
|
err := dec.Decode(&o)
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
r.Results = o.Results
|
||
|
|
if o.Err != "" {
|
||
|
|
r.Err = errors.New(o.Err)
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// Error returns the first error from any statement.
|
||
|
|
// Returns nil if no errors occurred on any statements.
|
||
|
|
func (r Response) Error() error {
|
||
|
|
if r.Err != nil {
|
||
|
|
return r.Err
|
||
|
|
}
|
||
|
|
for _, result := range r.Results {
|
||
|
|
if result.Err != nil {
|
||
|
|
return result.Err
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// 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
|
||
|
|
}
|
||
|
|
|
||
|
|
// MarshalJSON will format the time in RFC3339Nano
|
||
|
|
// Precision is also ignored as it is only used for writing, not reading
|
||
|
|
// Or another way to say it is we always send back in nanosecond precision
|
||
|
|
func (p *Point) MarshalJSON() ([]byte, error) {
|
||
|
|
point := struct {
|
||
|
|
Measurement string `json:"measurement,omitempty"`
|
||
|
|
Tags map[string]string `json:"tags,omitempty"`
|
||
|
|
Time string `json:"time,omitempty"`
|
||
|
|
Fields map[string]interface{} `json:"fields,omitempty"`
|
||
|
|
Precision string `json:"precision,omitempty"`
|
||
|
|
}{
|
||
|
|
Measurement: p.Measurement,
|
||
|
|
Tags: p.Tags,
|
||
|
|
Fields: p.Fields,
|
||
|
|
Precision: p.Precision,
|
||
|
|
}
|
||
|
|
// Let it omit empty if it's really zero
|
||
|
|
if !p.Time.IsZero() {
|
||
|
|
point.Time = p.Time.UTC().Format(time.RFC3339Nano)
|
||
|
|
}
|
||
|
|
return json.Marshal(&point)
|
||
|
|
}
|
||
|
|
|
||
|
|
// MarshalString renders string representation of a Point with specified
|
||
|
|
// precision. The default precision is nanoseconds.
|
||
|
|
func (p *Point) MarshalString() string {
|
||
|
|
pt, err := models.NewPoint(p.Measurement, p.Tags, p.Fields, p.Time)
|
||
|
|
if err != nil {
|
||
|
|
return "# ERROR: " + err.Error() + " " + p.Measurement
|
||
|
|
}
|
||
|
|
if p.Precision == "" || p.Precision == "ns" || p.Precision == "n" {
|
||
|
|
return pt.String()
|
||
|
|
}
|
||
|
|
return pt.PrecisionString(p.Precision)
|
||
|
|
}
|
||
|
|
|
||
|
|
// UnmarshalJSON decodes the data into the Point struct
|
||
|
|
func (p *Point) UnmarshalJSON(b []byte) error {
|
||
|
|
var normal struct {
|
||
|
|
Measurement string `json:"measurement"`
|
||
|
|
Tags map[string]string `json:"tags"`
|
||
|
|
Time time.Time `json:"time"`
|
||
|
|
Precision string `json:"precision"`
|
||
|
|
Fields map[string]interface{} `json:"fields"`
|
||
|
|
}
|
||
|
|
var epoch struct {
|
||
|
|
Measurement string `json:"measurement"`
|
||
|
|
Tags map[string]string `json:"tags"`
|
||
|
|
Time *int64 `json:"time"`
|
||
|
|
Precision string `json:"precision"`
|
||
|
|
Fields map[string]interface{} `json:"fields"`
|
||
|
|
}
|
||
|
|
|
||
|
|
if err := func() error {
|
||
|
|
var err error
|
||
|
|
dec := json.NewDecoder(bytes.NewBuffer(b))
|
||
|
|
dec.UseNumber()
|
||
|
|
if err = dec.Decode(&epoch); err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
// Convert from epoch to time.Time, but only if Time
|
||
|
|
// was actually set.
|
||
|
|
var ts time.Time
|
||
|
|
if epoch.Time != nil {
|
||
|
|
ts, err = EpochToTime(*epoch.Time, epoch.Precision)
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
}
|
||
|
|
p.Measurement = epoch.Measurement
|
||
|
|
p.Tags = epoch.Tags
|
||
|
|
p.Time = ts
|
||
|
|
p.Precision = epoch.Precision
|
||
|
|
p.Fields = normalizeFields(epoch.Fields)
|
||
|
|
return nil
|
||
|
|
}(); err == nil {
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
dec := json.NewDecoder(bytes.NewBuffer(b))
|
||
|
|
dec.UseNumber()
|
||
|
|
if err := dec.Decode(&normal); err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
normal.Time = SetPrecision(normal.Time, normal.Precision)
|
||
|
|
p.Measurement = normal.Measurement
|
||
|
|
p.Tags = normal.Tags
|
||
|
|
p.Time = normal.Time
|
||
|
|
p.Precision = normal.Precision
|
||
|
|
p.Fields = normalizeFields(normal.Fields)
|
||
|
|
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// Remove any notion of json.Number
|
||
|
|
func normalizeFields(fields map[string]interface{}) map[string]interface{} {
|
||
|
|
newFields := map[string]interface{}{}
|
||
|
|
|
||
|
|
for k, v := range fields {
|
||
|
|
switch v := v.(type) {
|
||
|
|
case json.Number:
|
||
|
|
jv, e := v.Float64()
|
||
|
|
if e != nil {
|
||
|
|
panic(fmt.Sprintf("unable to convert json.Number to float64: %s", e))
|
||
|
|
}
|
||
|
|
newFields[k] = jv
|
||
|
|
default:
|
||
|
|
newFields[k] = v
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return newFields
|
||
|
|
}
|
||
|
|
|
||
|
|
// 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 will be 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:"-"`
|
||
|
|
}
|
||
|
|
|
||
|
|
// UnmarshalJSON decodes the data into the BatchPoints struct
|
||
|
|
func (bp *BatchPoints) UnmarshalJSON(b []byte) error {
|
||
|
|
var normal struct {
|
||
|
|
Points []Point `json:"points"`
|
||
|
|
Database string `json:"database"`
|
||
|
|
RetentionPolicy string `json:"retentionPolicy"`
|
||
|
|
Tags map[string]string `json:"tags"`
|
||
|
|
Time time.Time `json:"time"`
|
||
|
|
Precision string `json:"precision"`
|
||
|
|
}
|
||
|
|
var epoch struct {
|
||
|
|
Points []Point `json:"points"`
|
||
|
|
Database string `json:"database"`
|
||
|
|
RetentionPolicy string `json:"retentionPolicy"`
|
||
|
|
Tags map[string]string `json:"tags"`
|
||
|
|
Time *int64 `json:"time"`
|
||
|
|
Precision string `json:"precision"`
|
||
|
|
}
|
||
|
|
|
||
|
|
if err := func() error {
|
||
|
|
var err error
|
||
|
|
if err = json.Unmarshal(b, &epoch); err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
// Convert from epoch to time.Time
|
||
|
|
var ts time.Time
|
||
|
|
if epoch.Time != nil {
|
||
|
|
ts, err = EpochToTime(*epoch.Time, epoch.Precision)
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
}
|
||
|
|
bp.Points = epoch.Points
|
||
|
|
bp.Database = epoch.Database
|
||
|
|
bp.RetentionPolicy = epoch.RetentionPolicy
|
||
|
|
bp.Tags = epoch.Tags
|
||
|
|
bp.Time = ts
|
||
|
|
bp.Precision = epoch.Precision
|
||
|
|
return nil
|
||
|
|
}(); err == nil {
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
if err := json.Unmarshal(b, &normal); err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
normal.Time = SetPrecision(normal.Time, normal.Precision)
|
||
|
|
bp.Points = normal.Points
|
||
|
|
bp.Database = normal.Database
|
||
|
|
bp.RetentionPolicy = normal.RetentionPolicy
|
||
|
|
bp.Tags = normal.Tags
|
||
|
|
bp.Time = normal.Time
|
||
|
|
bp.Precision = normal.Precision
|
||
|
|
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// utility functions
|
||
|
|
|
||
|
|
// Addr provides the current url as a string of the server the client is connected to.
|
||
|
|
func (c *Client) Addr() string {
|
||
|
|
return c.url.String()
|
||
|
|
}
|
||
|
|
|
||
|
|
// checkPointTypes ensures no unsupported types are submitted to influxdb, returning error if they are found.
|
||
|
|
func checkPointTypes(p Point) error {
|
||
|
|
for _, v := range p.Fields {
|
||
|
|
switch v.(type) {
|
||
|
|
case int, int8, int16, int32, int64, uint, uint8, uint16, uint32, float32, float64, bool, string, nil:
|
||
|
|
return nil
|
||
|
|
default:
|
||
|
|
return fmt.Errorf("unsupported point type: %T", v)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// helper functions
|
||
|
|
|
||
|
|
// EpochToTime takes a unix epoch time and uses precision to return back a time.Time
|
||
|
|
func EpochToTime(epoch int64, precision string) (time.Time, error) {
|
||
|
|
if precision == "" {
|
||
|
|
precision = "s"
|
||
|
|
}
|
||
|
|
var t time.Time
|
||
|
|
switch precision {
|
||
|
|
case "h":
|
||
|
|
t = time.Unix(0, epoch*int64(time.Hour))
|
||
|
|
case "m":
|
||
|
|
t = time.Unix(0, epoch*int64(time.Minute))
|
||
|
|
case "s":
|
||
|
|
t = time.Unix(0, epoch*int64(time.Second))
|
||
|
|
case "ms":
|
||
|
|
t = time.Unix(0, epoch*int64(time.Millisecond))
|
||
|
|
case "u":
|
||
|
|
t = time.Unix(0, epoch*int64(time.Microsecond))
|
||
|
|
case "n":
|
||
|
|
t = time.Unix(0, epoch)
|
||
|
|
default:
|
||
|
|
return time.Time{}, fmt.Errorf("Unknown precision %q", precision)
|
||
|
|
}
|
||
|
|
return t, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// SetPrecision will round a time to the specified precision
|
||
|
|
func SetPrecision(t time.Time, precision string) time.Time {
|
||
|
|
switch precision {
|
||
|
|
case "n":
|
||
|
|
case "u":
|
||
|
|
return t.Round(time.Microsecond)
|
||
|
|
case "ms":
|
||
|
|
return t.Round(time.Millisecond)
|
||
|
|
case "s":
|
||
|
|
return t.Round(time.Second)
|
||
|
|
case "m":
|
||
|
|
return t.Round(time.Minute)
|
||
|
|
case "h":
|
||
|
|
return t.Round(time.Hour)
|
||
|
|
}
|
||
|
|
return t
|
||
|
|
}
|