|
| 1 | +package metrics |
| 2 | + |
| 3 | +import ( |
| 4 | + "bufio" |
| 5 | + "io" |
| 6 | + "net/http" |
| 7 | + "os" |
| 8 | + "strings" |
| 9 | + |
| 10 | + cmdx "github.com/esonhugh/k8spider/cmd" |
| 11 | + "github.com/esonhugh/k8spider/pkg/metrics" |
| 12 | + log "github.com/sirupsen/logrus" |
| 13 | + "github.com/spf13/cobra" |
| 14 | +) |
| 15 | + |
| 16 | +var MetricOpt struct { |
| 17 | + From string |
| 18 | +} |
| 19 | + |
| 20 | +func init() { |
| 21 | + cmdx.RootCmd.AddCommand(MetricCmd) |
| 22 | + MetricCmd.PersistentFlags().StringVarP(&MetricOpt.From, "metric", "m", "", "metrics from (file / remote url)") |
| 23 | + |
| 24 | +} |
| 25 | + |
| 26 | +var MetricCmd = &cobra.Command{ |
| 27 | + Use: "metric", |
| 28 | + Short: "parse kube stat metrics to readable resource", |
| 29 | + Run: func(cmd *cobra.Command, args []string) { |
| 30 | + if MetricOpt.From == "" { |
| 31 | + return |
| 32 | + } |
| 33 | + log.Debugf("parse metrics from %v", MetricOpt.From) |
| 34 | + rule := metrics.DefaultMatchRules() |
| 35 | + if err := rule.Compile(); err != nil { |
| 36 | + log.Fatalf("compile rule failed: %v", err) |
| 37 | + } |
| 38 | + log.Debugf("compiled rules completed, start to get resource \n") |
| 39 | + |
| 40 | + ot := output() |
| 41 | + |
| 42 | + var r io.Reader |
| 43 | + if strings.HasPrefix("http://", MetricOpt.From) || strings.HasPrefix("https://", MetricOpt.From) { |
| 44 | + resp, err := http.Get(MetricOpt.From) |
| 45 | + if err != nil { |
| 46 | + log.Fatalf("get metrics from %v failed: %v", MetricOpt.From, err) |
| 47 | + } |
| 48 | + defer resp.Body.Close() |
| 49 | + r = resp.Body |
| 50 | + } else { |
| 51 | + f, err := os.OpenFile(MetricOpt.From, os.O_RDONLY, 0666) |
| 52 | + if err != nil { |
| 53 | + log.Fatalf("open file %v failed: %v", MetricOpt.From, err) |
| 54 | + } |
| 55 | + defer f.Close() |
| 56 | + r = f |
| 57 | + } |
| 58 | + log.Debugf("start to parse metrics line by line\n") |
| 59 | + |
| 60 | + var rx []*metrics.MetricMatcher |
| 61 | + |
| 62 | + scanner := bufio.NewScanner(r) |
| 63 | + for scanner.Scan() { |
| 64 | + line := scanner.Text() |
| 65 | + res, err := rule.Match(line) |
| 66 | + if err != nil { |
| 67 | + continue |
| 68 | + } else { |
| 69 | + log.Debugf("matched: %s", res.DumpString()) |
| 70 | + rx = append(rx, res.CopyData()) |
| 71 | + } |
| 72 | + } |
| 73 | + if err := scanner.Err(); err != nil { |
| 74 | + log.Warnf("scan metrics failed and break out, reason: %v", err) |
| 75 | + } |
| 76 | + var res metrics.ResourceList = metrics.ConvertToResource(rx) |
| 77 | + log.Debugf("parse metrics completed, start to print result\n") |
| 78 | + |
| 79 | + res.Print(ot) |
| 80 | + }, |
| 81 | +} |
| 82 | + |
| 83 | +func output() io.WriteCloser { |
| 84 | + if cmdx.Opts.OutputFile != "" { |
| 85 | + f, err := os.OpenFile(cmdx.Opts.OutputFile, os.O_CREATE|os.O_WRONLY, 0644) |
| 86 | + if err != nil { |
| 87 | + log.Warnf("create output file failed: %v", err) |
| 88 | + return nil |
| 89 | + } |
| 90 | + return f |
| 91 | + } else { |
| 92 | + return os.Stdout |
| 93 | + } |
| 94 | +} |
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