/
influxdb.go
521 lines (468 loc) · 13.3 KB
/
influxdb.go
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package client
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
"net/url"
"time"
"github.com/influxdb/influxdb/influxql"
)
// Query is used to send a command to the server. Both Command and Database are required.
type Query struct {
Command string
Database string
}
// 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",
type Config struct {
URL url.URL
Username string
Password string
UserAgent string
}
// Client is used to make calls to the server.
type Client struct {
url url.URL
username string
password string
httpClient *http.Client
userAgent string
}
// 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{},
userAgent: c.UserAgent,
}
if client.userAgent == "" {
client.userAgent = "InfluxDBClient"
}
return &client, nil
}
// Query sends a command to the server and returns the Results
func (c *Client) Query(q Query) (*Results, error) {
u := c.url
u.Path = "query"
if c.username != "" {
u.User = url.UserPassword(c.username, c.password)
}
values := u.Query()
values.Set("q", q.Command)
values.Set("db", q.Database)
u.RawQuery = values.Encode()
req, err := http.NewRequest("GET", u.String(), nil)
if err != nil {
return nil, err
}
req.Header.Set("User-Agent", c.userAgent)
resp, err := c.httpClient.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
var results Results
dec := json.NewDecoder(resp.Body)
dec.UseNumber()
err = dec.Decode(&results)
if err != nil {
return nil, err
}
return &results, nil
}
// Write takes BatchPoints and allows for writing of multiple points with defaults
// If successful, error is nil and Results is nil
// If an error occurs, Results may contain additional information if populated.
func (c *Client) Write(bp BatchPoints) (*Results, error) {
c.url.Path = "write"
b, err := json.Marshal(&bp)
if err != nil {
return nil, err
}
req, err := http.NewRequest("POST", c.url.String(), bytes.NewBuffer(b))
if err != nil {
return nil, err
}
req.Header.Set("Content-Type", "application/json")
req.Header.Set("User-Agent", c.userAgent)
resp, err := c.httpClient.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
var results Results
dec := json.NewDecoder(resp.Body)
dec.UseNumber()
err = dec.Decode(&results)
if err != nil && err.Error() != "EOF" {
return nil, err
}
if resp.StatusCode != http.StatusOK {
return &results, results.Error()
}
return nil, nil
}
// Ping will check to see if the server is up
// Ping returns how long the requeset took, the version of the server it connected to, and an error if one occured.
func (c *Client) Ping() (time.Duration, string, error) {
now := time.Now()
u := c.url
u.Path = "ping"
req, err := http.NewRequest("GET", u.String(), nil)
if err != nil {
return 0, "", err
}
req.Header.Set("User-Agent", c.userAgent)
resp, err := c.httpClient.Do(req)
if err != nil {
return 0, "", err
}
version := resp.Header.Get("X-Influxdb-Version")
return time.Since(now), version, nil
}
// Dump connects to server and retrieves all data stored for specified database.
// If successful, Dump returns the entire response body, which is an io.ReadCloser
func (c *Client) Dump(db string) (io.ReadCloser, error) {
u := c.url
u.Path = "dump"
values := u.Query()
values.Set("db", db)
values.Set("user", c.username)
values.Set("password", c.password)
u.RawQuery = values.Encode()
req, err := http.NewRequest("GET", u.String(), nil)
if err != nil {
return nil, err
}
req.Header.Set("User-Agent", c.userAgent)
resp, err := c.httpClient.Do(req)
if err != nil {
return nil, err
}
if resp.StatusCode != http.StatusOK {
return resp.Body, fmt.Errorf("HTTP Protocol error %d", resp.StatusCode)
}
return resp.Body, nil
}
// Structs
// Result represents a resultset returned from a single statement.
type Result struct {
Series []influxql.Row
Err error
}
// MarshalJSON encodes the result into JSON.
func (r *Result) MarshalJSON() ([]byte, error) {
// Define a struct that outputs "error" as a string.
var o struct {
Series []influxql.Row `json:"series,omitempty"`
Err string `json:"error,omitempty"`
}
// Copy fields to output struct.
o.Series = r.Series
if r.Err != nil {
o.Err = r.Err.Error()
}
return json.Marshal(&o)
}
// UnmarshalJSON decodes the data into the Result struct
func (r *Result) UnmarshalJSON(b []byte) error {
var o struct {
Series []influxql.Row `json:"series,omitempty"`
Err string `json:"error,omitempty"`
}
dec := json.NewDecoder(bytes.NewBuffer(b))
dec.UseNumber()
err := dec.Decode(&o)
if err != nil {
return err
}
r.Series = o.Series
if o.Err != "" {
r.Err = errors.New(o.Err)
}
return nil
}
// Results represents a list of statement results.
type Results struct {
Results []Result
Err error
}
// MarshalJSON encodes the result into JSON.
func (r *Results) MarshalJSON() ([]byte, error) {
// Define a struct that outputs "error" as a string.
var o struct {
Results []Result `json:"results,omitempty"`
Err string `json:"error,omitempty"`
}
// Copy fields to output struct.
o.Results = r.Results
if r.Err != nil {
o.Err = r.Err.Error()
}
return json.Marshal(&o)
}
// UnmarshalJSON decodes the data into the Results struct
func (r *Results) 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 Results) 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
// Name, Timestamp, and Fields are required
// Precision can be specified if the timestamp is in epoch format (integer).
// Valid values for Precision are n, u, ms, s, m, and h
type Point struct {
Name string
Tags map[string]string
Timestamp time.Time
Fields map[string]interface{}
Precision 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 {
Name string `json:"name,omitempty"`
Tags map[string]string `json:"tags,omitempty"`
Timestamp string `json:"timestamp,omitempty"`
Fields map[string]interface{} `json:"fields,omitempty"`
Precision string `json:"precision,omitempty"`
}{
Name: p.Name,
Tags: p.Tags,
Fields: p.Fields,
Precision: p.Precision,
}
// Let it omit empty if it's really zero
if !p.Timestamp.IsZero() {
point.Timestamp = p.Timestamp.UTC().Format(time.RFC3339Nano)
}
return json.Marshal(&point)
}
// UnmarshalJSON decodes the data into the Point struct
func (p *Point) UnmarshalJSON(b []byte) error {
var normal struct {
Name string `json:"name"`
Tags map[string]string `json:"tags"`
Timestamp time.Time `json:"timestamp"`
Precision string `json:"precision"`
Fields map[string]interface{} `json:"fields"`
}
var epoch struct {
Name string `json:"name"`
Tags map[string]string `json:"tags"`
Timestamp *int64 `json:"timestamp"`
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 Timestamp
// was actually set.
var ts time.Time
if epoch.Timestamp != nil {
ts, err = EpochToTime(*epoch.Timestamp, epoch.Precision)
if err != nil {
return err
}
}
p.Name = epoch.Name
p.Tags = epoch.Tags
p.Timestamp = 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.Timestamp = SetPrecision(normal.Timestamp, normal.Precision)
p.Name = normal.Name
p.Tags = normal.Tags
p.Timestamp = normal.Timestamp
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 is ignored.
// If timestamp is specified, it will be applied to any point with an empty timestamp.
// Precision can be specified if the timestamp 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"`
Timestamp time.Time `json:"timestamp,omitempty"`
Precision string `json:"precision,omitempty"`
}
// 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"`
Timestamp time.Time `json:"timestamp"`
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"`
Timestamp *int64 `json:"timestamp"`
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.Timestamp != nil {
ts, err = EpochToTime(*epoch.Timestamp, epoch.Precision)
if err != nil {
return err
}
}
bp.Points = epoch.Points
bp.Database = epoch.Database
bp.RetentionPolicy = epoch.RetentionPolicy
bp.Tags = epoch.Tags
bp.Timestamp = ts
bp.Precision = epoch.Precision
return nil
}(); err == nil {
return nil
}
if err := json.Unmarshal(b, &normal); err != nil {
return err
}
normal.Timestamp = SetPrecision(normal.Timestamp, normal.Precision)
bp.Points = normal.Points
bp.Database = normal.Database
bp.RetentionPolicy = normal.RetentionPolicy
bp.Tags = normal.Tags
bp.Timestamp = normal.Timestamp
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()
}
// 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("Unknowm 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
}
func detect(values ...string) string {
for _, v := range values {
if v != "" {
return v
}
}
return ""
}