98 lines
2.6 KiB
Go
98 lines
2.6 KiB
Go
// Copyright 2015 Google Inc. All Rights Reserved.
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//
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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 collector
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import (
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"encoding/json"
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"fmt"
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"io/ioutil"
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"regexp"
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"time"
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"github.com/google/cadvisor/info/v1"
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)
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type GenericCollector struct {
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//name of the collector
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name string
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//holds information extracted from the config file for a collector
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configFile Config
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//holds information necessary to extract metrics
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info *collectorInfo
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}
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type collectorInfo struct {
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//minimum polling frequency among all metrics
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minPollingFrequency time.Duration
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//regular expresssions for all metrics
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regexps []*regexp.Regexp
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}
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//Returns a new collector using the information extracted from the configfile
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func NewCollector(collectorName string, configfile string) (*GenericCollector, error) {
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configFile, err := ioutil.ReadFile(configfile)
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if err != nil {
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return nil, err
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}
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var configInJSON Config
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err = json.Unmarshal(configFile, &configInJSON)
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if err != nil {
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return nil, err
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}
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//TODO : Add checks for validity of config file (eg : Accurate JSON fields)
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if len(configInJSON.MetricsConfig) == 0 {
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return nil, fmt.Errorf("No metrics provided in config")
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}
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minPollFrequency := configInJSON.MetricsConfig[0].PollingFrequency
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regexprs := make([]*regexp.Regexp, len(configInJSON.MetricsConfig))
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for ind, metricConfig := range configInJSON.MetricsConfig {
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if metricConfig.PollingFrequency < minPollFrequency {
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minPollFrequency = metricConfig.PollingFrequency
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}
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regexprs[ind], err = regexp.Compile(metricConfig.Regex)
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if err != nil {
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return nil, fmt.Errorf("Invalid regexp %v for metric %v", metricConfig.Regex, metricConfig.Name)
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}
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}
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return &GenericCollector{
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name: collectorName,
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configFile: configInJSON,
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info: &collectorInfo{
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minPollingFrequency: minPollFrequency,
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regexps: regexprs},
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}, nil
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}
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//Returns name of the collector
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func (collector *GenericCollector) Name() string {
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return collector.name
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}
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//Returns collected metrics and the next collection time of the collector
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func (collector *GenericCollector) Collect() (time.Time, []v1.Metric, error) {
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//TO BE IMPLEMENTED
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return time.Now(), nil, nil
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}
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