mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
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112 lines
3.1 KiB
Go
112 lines
3.1 KiB
Go
package datasource
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import (
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"context"
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"encoding/json"
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"fmt"
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"io/ioutil"
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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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)
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type response struct {
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Status string `json:"status"`
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Data struct {
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ResultType string `json:"resultType"`
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Result []struct {
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Labels map[string]string `json:"metric"`
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TV [2]interface{} `json:"value"`
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} `json:"result"`
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} `json:"data"`
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ErrorType string `json:"errorType"`
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Error string `json:"error"`
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}
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func (r response) metrics() ([]Metric, error) {
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var ms []Metric
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var m Metric
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var f float64
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var err error
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for i, res := range r.Data.Result {
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f, err = strconv.ParseFloat(res.TV[1].(string), 64)
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if err != nil {
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return nil, fmt.Errorf("metric %v, unable to parse float64 from %s: %w", res, res.TV[1], err)
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}
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m.Labels = nil
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for k, v := range r.Data.Result[i].Labels {
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m.AddLabel(k, v)
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}
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m.Timestamp = int64(res.TV[0].(float64))
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m.Value = f
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ms = append(ms, m)
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}
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return ms, nil
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}
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// VMStorage represents vmstorage entity with ability to read and write metrics
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type VMStorage struct {
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c *http.Client
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queryURL string
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basicAuthUser string
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basicAuthPass string
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lookBack time.Duration
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}
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const queryPath = "/api/v1/query?query="
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// NewVMStorage is a constructor for VMStorage
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func NewVMStorage(baseURL, basicAuthUser, basicAuthPass string, lookBack time.Duration, c *http.Client) *VMStorage {
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return &VMStorage{
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c: c,
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basicAuthUser: basicAuthUser,
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basicAuthPass: basicAuthPass,
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queryURL: strings.TrimSuffix(baseURL, "/") + queryPath,
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lookBack: lookBack,
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}
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}
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// Query reads metrics from datasource by given query
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func (s *VMStorage) Query(ctx context.Context, query string) ([]Metric, error) {
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const (
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statusSuccess, statusError, rtVector = "success", "error", "vector"
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)
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q := s.queryURL + url.QueryEscape(query)
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if s.lookBack > 0 {
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lookBack := time.Now().Add(-s.lookBack)
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q += fmt.Sprintf("&time=%d", lookBack.Unix())
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}
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req, err := http.NewRequest("POST", q, 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("Content-Type", "application/json; charset=utf-8")
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if s.basicAuthPass != "" {
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req.SetBasicAuth(s.basicAuthUser, s.basicAuthPass)
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}
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resp, err := s.c.Do(req.WithContext(ctx))
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if err != nil {
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return nil, fmt.Errorf("error getting response from %s: %w", req.URL, err)
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}
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defer func() { _ = resp.Body.Close() }()
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if resp.StatusCode != http.StatusOK {
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body, _ := ioutil.ReadAll(resp.Body)
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return nil, fmt.Errorf("datasource returns unexpected response code %d for %s. Response body %s", resp.StatusCode, req.URL, body)
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}
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r := &response{}
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if err := json.NewDecoder(resp.Body).Decode(r); err != nil {
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return nil, fmt.Errorf("error parsing metrics for %s: %w", req.URL, err)
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}
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if r.Status == statusError {
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return nil, fmt.Errorf("response error, query: %s, errorType: %s, error: %s", req.URL, r.ErrorType, r.Error)
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}
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if r.Status != statusSuccess {
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return nil, fmt.Errorf("unknown status: %s, Expected success or error ", r.Status)
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}
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if r.Data.ResultType != rtVector {
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return nil, fmt.Errorf("unknown result type:%s. Expected vector", r.Data.ResultType)
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}
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return r.metrics()
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}
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