/
facette.go
176 lines (150 loc) · 4.05 KB
/
facette.go
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// +build !disable_connector_facette
package connector
import (
"bytes"
"encoding/json"
"fmt"
"net/http"
"net/url"
"time"
"facette.io/facette/catalog"
"facette.io/facette/series"
"facette.io/facette/storage"
"facette.io/facette/version"
"facette.io/httputil"
"facette.io/logger"
"facette.io/maputil"
)
const (
facetteURLCatalog = "/api/v1/catalog/"
facetteURLPoints = "/api/v1/series/points"
)
func init() {
connectors["facette"] = func(name string, settings *maputil.Map, logger *logger.Logger) (Connector, error) {
var err error
c := &facetteConnector{
name: name,
}
// Get connector handler settings
c.url, err = settings.GetString("url", "")
if err != nil {
return nil, err
} else if c.url == "" {
return nil, ErrMissingConnectorSetting("url")
}
c.url = normalizeURL(c.url)
c.timeout, err = settings.GetInt("timeout", defaultTimeout)
if err != nil {
return nil, err
}
c.allowInsecure, err = settings.GetBool("allow_insecure_tls", false)
if err != nil {
return nil, err
}
// Check remote instance URL
_, err = url.Parse(c.url)
if err != nil {
return nil, fmt.Errorf("unable to parse URL: %s", err)
}
c.client = httputil.NewClient(time.Duration(c.timeout)*time.Second, true, c.allowInsecure)
return c, nil
}
}
type facetteConnector struct {
name string
url string
timeout int
allowInsecure bool
client *http.Client
}
func (c *facetteConnector) Name() string {
return c.name
}
func (c *facetteConnector) Points(query *series.Query) ([]series.Series, error) {
// Convert query into a Facette point request
body, err := json.Marshal(series.Request{
StartTime: query.StartTime,
EndTime: query.EndTime,
Sample: query.Sample,
Graph: &storage.Graph{
Item: storage.Item{
Name: "facette",
},
Groups: storage.SeriesGroups{
{
Series: func(metrics []*catalog.Metric) []*storage.Series {
out := make([]*storage.Series, len(metrics))
for idx, m := range metrics {
out[idx] = &storage.Series{
Name: fmt.Sprintf("series%d", idx),
Origin: m.Origin().Name,
Source: m.Source().Name,
Metric: m.Name,
}
}
return out
}(query.Metrics),
},
},
},
})
if err != nil {
return nil, fmt.Errorf("unable to marshal points request: %s", err)
}
// Create new HTTP request
req, err := http.NewRequest("POST", c.url+facetteURLPoints, bytes.NewReader(body))
if err != nil {
return nil, fmt.Errorf("unable to set up HTTP request: %s", err)
}
req.Header.Add("User-Agent", "facette/"+version.Version)
req.Header.Add("Content-Type", "application/json")
// Retrieve upstream data points
resp, err := c.client.Do(req)
if err != nil {
return nil, fmt.Errorf("unable to perform HTTP request: %s", err)
}
defer resp.Body.Close()
// Fill result with data received from request
data := series.Response{}
if err := httputil.BindJSON(resp, &data); err != nil {
return nil, fmt.Errorf("unable to unmarshal JSON data: %s", err)
}
result := []series.Series{}
for _, s := range data.Series {
result = append(result, series.Series{
Points: s.Points,
Summary: s.Summary,
})
}
return result, nil
}
func (c *facetteConnector) Refresh(output chan<- *catalog.Record) error {
// Create new HTTP request
req, err := http.NewRequest("GET", c.url+facetteURLCatalog, nil)
if err != nil {
return fmt.Errorf("unable to set up HTTP request: %s", err)
}
req.Header.Add("User-Agent", "facette/"+version.Version)
// Retrieve data from upstream catalog
resp, err := c.client.Do(req)
if err != nil {
return fmt.Errorf("unable to perform HTTP request: %s", err)
}
defer resp.Body.Close()
result := make(map[string]map[string][]string)
if err := httputil.BindJSON(resp, &result); err != nil {
return fmt.Errorf("unable to unmarshal JSON data: %s", err)
}
for origin, sources := range result {
for source, metrics := range sources {
for _, metric := range metrics {
output <- &catalog.Record{
Origin: origin,
Source: source,
Metric: metric,
}
}
}
}
return nil
}