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influx.go
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influx.go
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package influx
import (
"context"
"crypto/tls"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"strings"
cloudhub "github.com/snetsystems/cloudhub/backend"
)
var _ cloudhub.TimeSeries = &Client{}
var _ cloudhub.TSDBStatus = &Client{}
var _ cloudhub.Databases = &Client{}
// Shared transports for all clients to prevent leaking connections
var (
skipVerifyTransport = &http.Transport{
TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
}
defaultTransport = &http.Transport{}
)
// Client is a device for retrieving time series data from an InfluxDB instance
type Client struct {
URL *url.URL
Authorizer Authorizer
InsecureSkipVerify bool
Logger cloudhub.Logger
}
// Response is a partial JSON decoded InfluxQL response used
// to check for some errors
type Response struct {
Results json.RawMessage
Err string `json:"error,omitempty"`
}
// MarshalJSON returns the raw results bytes from the response
func (r Response) MarshalJSON() ([]byte, error) {
return r.Results, nil
}
func (c *Client) query(u *url.URL, q cloudhub.Query) (cloudhub.Response, error) {
u.Path = "query"
req, err := http.NewRequest("POST", u.String(), nil)
if err != nil {
return nil, err
}
req.Header.Set("Content-Type", "application/json")
command := q.Command
logs := c.Logger.
WithField("component", "proxy").
WithField("host", req.Host).
WithField("command", command).
WithField("db", q.DB).
WithField("rp", q.RP)
logs.Debug("query")
params := req.URL.Query()
params.Set("q", command)
params.Set("db", q.DB)
params.Set("rp", q.RP)
params.Set("epoch", "ms")
if q.Epoch != "" {
params.Set("epoch", q.Epoch)
}
req.URL.RawQuery = params.Encode()
if c.Authorizer != nil {
if err := c.Authorizer.Set(req); err != nil {
logs.Error("Error setting authorization header ", err)
return nil, err
}
}
hc := &http.Client{}
if c.InsecureSkipVerify {
hc.Transport = skipVerifyTransport
} else {
hc.Transport = defaultTransport
}
resp, err := hc.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
var response Response
dec := json.NewDecoder(resp.Body)
decErr := dec.Decode(&response)
if resp.StatusCode != http.StatusOK {
return nil, fmt.Errorf("received status code %d from server: err: %s", resp.StatusCode, response.Err)
}
// ignore this error if we got an invalid status code
if decErr != nil && decErr.Error() == "EOF" && resp.StatusCode != http.StatusOK {
decErr = nil
}
// If we got a valid decode error, send that back
if decErr != nil {
logs.WithField("influx_status", resp.StatusCode).
Error("Error parsing results from influxdb: err:", decErr)
return nil, decErr
}
// If we don't have an error in our json response, and didn't get statusOK
// then send back an error
if resp.StatusCode != http.StatusOK && response.Err != "" {
logs.
WithField("influx_status", resp.StatusCode).
Error("Received non-200 response from influxdb")
return &response, fmt.Errorf("received status code %d from server",
resp.StatusCode)
}
return &response, nil
}
type result struct {
Response cloudhub.Response
Err error
}
// Query issues a request to a configured InfluxDB instance for time series
// information specified by query. Queries must be "fully-qualified," and
// include both the database and retention policy. In-flight requests can be
// cancelled using the provided context.
func (c *Client) Query(ctx context.Context, q cloudhub.Query) (cloudhub.Response, error) {
resps := make(chan (result))
go func() {
resp, err := c.query(c.URL, q)
resps <- result{resp, err}
}()
select {
case resp := <-resps:
return resp.Response, resp.Err
case <-ctx.Done():
return nil, cloudhub.ErrUpstreamTimeout
}
}
// Connect caches the URL and optional Bearer Authorization for the data source
func (c *Client) Connect(ctx context.Context, src *cloudhub.Source) error {
u, err := url.Parse(src.URL)
if err != nil {
return err
}
c.Authorizer = DefaultAuthorization(src)
// Only allow acceptance of all certs if the scheme is https AND the user opted into to the setting.
if u.Scheme == "https" && src.InsecureSkipVerify {
c.InsecureSkipVerify = src.InsecureSkipVerify
}
c.URL = u
return nil
}
// Users transforms InfluxDB into a user store
func (c *Client) Users(ctx context.Context) cloudhub.UsersStore {
return c
}
// Roles aren't support in OSS
func (c *Client) Roles(ctx context.Context) (cloudhub.RolesStore, error) {
return nil, fmt.Errorf("Roles not support in open-source InfluxDB. Roles are support in Influx Enterprise")
}
// Ping hits the influxdb ping endpoint and returns the type of influx
func (c *Client) Ping(ctx context.Context) error {
_, _, err := c.pingTimeout(ctx)
return err
}
// Version hits the influxdb ping endpoint and returns the version of influx
func (c *Client) Version(ctx context.Context) (string, error) {
version, _, err := c.pingTimeout(ctx)
return version, err
}
// Type hits the influxdb ping endpoint and returns the type of influx running
func (c *Client) Type(ctx context.Context) (string, error) {
_, tsdbType, err := c.pingTimeout(ctx)
return tsdbType, err
}
func (c *Client) pingTimeout(ctx context.Context) (string, string, error) {
resps := make(chan (pingResult))
go func() {
version, tsdbType, err := c.ping(c.URL)
resps <- pingResult{version, tsdbType, err}
}()
select {
case resp := <-resps:
return resp.Version, resp.Type, resp.Err
case <-ctx.Done():
return "", "", cloudhub.ErrUpstreamTimeout
}
}
type pingResult struct {
Version string
Type string
Err error
}
func (c *Client) ping(u *url.URL) (string, string, error) {
u.Path = "ping"
req, err := http.NewRequest("GET", u.String(), nil)
if err != nil {
return "", "", err
}
if c.Authorizer != nil {
err = c.Authorizer.Set(req)
if err != nil {
return "", "", err
}
}
hc := &http.Client{}
if c.InsecureSkipVerify {
hc.Transport = skipVerifyTransport
} else {
hc.Transport = defaultTransport
}
resp, err := hc.Do(req)
if err != nil {
return "", "", err
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return "", "", err
}
if resp.StatusCode != http.StatusNoContent {
var err = fmt.Errorf(string(body))
return "", "", err
}
version := resp.Header.Get("X-Influxdb-Build")
if version == "ENT" {
return version, cloudhub.InfluxEnterprise, nil
}
version = resp.Header.Get("X-Influxdb-Version")
if strings.Contains(version, "-c") {
return version, cloudhub.InfluxEnterprise, nil
} else if strings.Contains(version, "relay") {
return version, cloudhub.InfluxRelay, nil
}
return version, cloudhub.InfluxDB, nil
}
// Write POSTs line protocol to a database and retention policy
func (c *Client) Write(ctx context.Context, points []cloudhub.Point) error {
for _, point := range points {
if err := c.writePoint(ctx, &point); err != nil {
return err
}
}
return nil
}
func (c *Client) writePoint(ctx context.Context, point *cloudhub.Point) error {
lp, err := toLineProtocol(point)
if err != nil {
return err
}
err = c.write(ctx, c.URL, point.Database, point.RetentionPolicy, lp)
if err == nil {
return nil
}
// Some influxdb errors should not be treated as errors
if strings.Contains(err.Error(), "hinted handoff queue not empty") {
// This is an informational message
return nil
}
// If the database was not found, try to recreate it:
if strings.Contains(err.Error(), "database not found") {
_, err = c.CreateDB(ctx, &cloudhub.Database{
Name: point.Database,
})
if err != nil {
return err
}
// retry the write
return c.write(ctx, c.URL, point.Database, point.RetentionPolicy, lp)
}
return err
}
func (c *Client) write(ctx context.Context, u *url.URL, db, rp, lp string) error {
u.Path = "write"
req, err := http.NewRequest("POST", u.String(), strings.NewReader(lp))
if err != nil {
return err
}
req.Header.Set("Content-Type", "text/plain; charset=utf-8")
if c.Authorizer != nil {
if err := c.Authorizer.Set(req); err != nil {
return err
}
}
params := req.URL.Query()
params.Set("db", db)
params.Set("rp", rp)
req.URL.RawQuery = params.Encode()
hc := &http.Client{}
if c.InsecureSkipVerify {
hc.Transport = skipVerifyTransport
} else {
hc.Transport = defaultTransport
}
errChan := make(chan (error))
go func() {
resp, err := hc.Do(req)
if err != nil {
errChan <- err
return
}
if resp.StatusCode == http.StatusNoContent {
errChan <- nil
return
}
defer resp.Body.Close()
var response Response
dec := json.NewDecoder(resp.Body)
err = dec.Decode(&response)
if err != nil && err.Error() != "EOF" {
errChan <- err
return
}
errChan <- errors.New(response.Err)
return
}()
select {
case err := <-errChan:
return err
case <-ctx.Done():
return cloudhub.ErrUpstreamTimeout
}
}