mirror of
https://github.com/prometheus-community/json_exporter
synced 2025-01-11 08:49:37 +00:00
97 lines
2.4 KiB
Go
97 lines
2.4 KiB
Go
// Copyright 2020 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package jsonexporter
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import (
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"fmt"
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"io/ioutil"
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"net/http"
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"github.com/kawamuray/jsonpath" // Originally: "github.com/NickSardo/jsonpath"
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"github.com/prometheus-community/json_exporter/harness"
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log "github.com/sirupsen/logrus"
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)
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type Collector struct {
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Endpoint string
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scrapers []JsonScraper
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}
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func compilePath(path string) (*jsonpath.Path, error) {
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// All paths in this package is for extracting a value.
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// Complete trailing '+' sign if necessary.
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if path[len(path)-1] != '+' {
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path += "+"
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}
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paths, err := jsonpath.ParsePaths(path)
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if err != nil {
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return nil, err
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}
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return paths[0], nil
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}
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func compilePaths(paths map[string]string) (map[string]*jsonpath.Path, error) {
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compiledPaths := make(map[string]*jsonpath.Path)
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for name, value := range paths {
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if len(value) < 1 || value[0] != '$' {
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// Static value
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continue
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}
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compiledPath, err := compilePath(value)
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if err != nil {
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return nil, fmt.Errorf("failed to parse path;path:<%s>,err:<%s>", value, err)
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}
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compiledPaths[name] = compiledPath
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}
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return compiledPaths, nil
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}
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func NewCollector(endpoint string, scrapers []JsonScraper) *Collector {
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return &Collector{
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Endpoint: endpoint,
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scrapers: scrapers,
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}
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}
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func (col *Collector) fetchJson() ([]byte, error) {
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resp, err := http.Get(col.Endpoint)
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if err != nil {
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return nil, fmt.Errorf("failed to fetch json from endpoint;endpoint:<%s>,err:<%s>", col.Endpoint, err)
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}
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defer resp.Body.Close()
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data, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return nil, fmt.Errorf("failed to read response body;err:<%s>", err)
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}
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return data, nil
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}
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func (col *Collector) Collect(reg *harness.MetricRegistry) {
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json, err := col.fetchJson()
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if err != nil {
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log.Error(err)
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return
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}
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for _, scraper := range col.scrapers {
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if err := scraper.Scrape(json, reg); err != nil {
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log.Errorf("error while scraping json;err:<%s>", err)
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continue
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}
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}
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}
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