mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-12-01 14:47:38 +00:00
357 lines
8.8 KiB
Go
357 lines
8.8 KiB
Go
package main
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import (
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"context"
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"errors"
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"flag"
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"fmt"
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"io"
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"io/fs"
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"net/http"
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"net/url"
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"os"
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"os/signal"
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"strconv"
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"strings"
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"syscall"
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"time"
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"github.com/ergochat/readline"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/buildinfo"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/envflag"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/flagutil"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/logstorage"
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)
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var (
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datasourceURL = flag.String("datasource.url", "http://localhost:9428/select/logsql/query", "URL for querying VictoriaLogs; "+
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"see https://docs.victoriametrics.com/victorialogs/querying/#querying-logs")
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historyFile = flag.String("historyFile", "vlogscli-history", "Path to file with command history")
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header = flagutil.NewArrayString("header", "Optional header to pass in request -datasource.url in the form 'HeaderName: value'")
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)
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const (
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firstLinePrompt = ";> "
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nextLinePrompt = ""
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)
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func main() {
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// Write flags and help message to stdout, since it is easier to grep or pipe.
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flag.CommandLine.SetOutput(os.Stdout)
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flag.Usage = usage
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envflag.Parse()
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buildinfo.Init()
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logger.InitNoLogFlags()
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hes, err := parseHeaders(*header)
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if err != nil {
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fatalf("cannot parse -header command-line flag: %s", err)
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}
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headers = hes
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incompleteLine := ""
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cfg := &readline.Config{
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Prompt: firstLinePrompt,
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DisableAutoSaveHistory: true,
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Listener: func(line []rune, pos int, _ rune) ([]rune, int, bool) {
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incompleteLine = string(line)
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return line, pos, false
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},
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}
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rl, err := readline.NewFromConfig(cfg)
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if err != nil {
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fatalf("cannot initialize readline: %s", err)
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}
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fmt.Fprintf(rl, "sending queries to %s\n", *datasourceURL)
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runReadlineLoop(rl, &incompleteLine)
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if err := rl.Close(); err != nil {
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fatalf("cannot close readline: %s", err)
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}
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}
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func runReadlineLoop(rl *readline.Instance, incompleteLine *string) {
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historyLines, err := loadFromHistory(*historyFile)
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if err != nil {
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fatalf("cannot load query history: %s", err)
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}
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for _, line := range historyLines {
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if err := rl.SaveToHistory(line); err != nil {
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fatalf("cannot initialize query history: %s", err)
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}
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}
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outputMode := outputModeJSONMultiline
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s := ""
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for {
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line, err := rl.ReadLine()
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if err != nil {
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switch err {
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case io.EOF:
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if s != "" {
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// This is non-interactive query execution.
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if err := executeQuery(context.Background(), rl, s, outputMode); err != nil {
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fmt.Fprintf(rl, "%s\n", err)
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}
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}
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return
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case readline.ErrInterrupt:
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if s == "" && *incompleteLine == "" {
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fmt.Fprintf(rl, "interrupted\n")
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os.Exit(128 + int(syscall.SIGINT))
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}
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// Default value for Ctrl+C - clear the prompt and store the incompletely entered line into history
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s += *incompleteLine
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historyLines = pushToHistory(rl, historyLines, s)
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s = ""
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rl.SetPrompt(firstLinePrompt)
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continue
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default:
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fatalf("unexpected error in readline: %s", err)
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}
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}
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s += line
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if s == "" {
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// Skip empty lines
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continue
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}
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if isQuitCommand(s) {
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fmt.Fprintf(rl, "bye!\n")
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_ = pushToHistory(rl, historyLines, s)
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return
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}
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if isHelpCommand(s) {
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printCommandsHelp(rl)
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historyLines = pushToHistory(rl, historyLines, s)
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s = ""
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continue
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}
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if s == `\s` {
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fmt.Fprintf(rl, "singleline json output mode\n")
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outputMode = outputModeJSONSingleline
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historyLines = pushToHistory(rl, historyLines, s)
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s = ""
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continue
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}
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if s == `\m` {
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fmt.Fprintf(rl, "multiline json output mode\n")
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outputMode = outputModeJSONMultiline
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historyLines = pushToHistory(rl, historyLines, s)
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s = ""
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continue
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}
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if s == `\logfmt` {
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fmt.Fprintf(rl, "logfmt output mode\n")
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outputMode = outputModeLogfmt
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historyLines = pushToHistory(rl, historyLines, s)
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s = ""
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continue
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}
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if line != "" && !strings.HasSuffix(line, ";") {
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// Assume the query is incomplete and allow the user finishing the query on the next line
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s += "\n"
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rl.SetPrompt(nextLinePrompt)
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continue
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}
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// Execute the query
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ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt)
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err = executeQuery(ctx, rl, s, outputMode)
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cancel()
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if err != nil {
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if errors.Is(err, context.Canceled) {
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fmt.Fprintf(rl, "\n")
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} else {
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fmt.Fprintf(rl, "%s\n", err)
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}
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// Save queries in the history even if they weren't finished successfully
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}
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historyLines = pushToHistory(rl, historyLines, s)
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s = ""
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rl.SetPrompt(firstLinePrompt)
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}
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}
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func pushToHistory(rl *readline.Instance, historyLines []string, s string) []string {
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s = strings.TrimSpace(s)
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if len(historyLines) == 0 || historyLines[len(historyLines)-1] != s {
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historyLines = append(historyLines, s)
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if len(historyLines) > 500 {
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historyLines = historyLines[len(historyLines)-500:]
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}
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if err := saveToHistory(*historyFile, historyLines); err != nil {
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fatalf("cannot save query history: %s", err)
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}
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}
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if err := rl.SaveToHistory(s); err != nil {
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fatalf("cannot update query history: %s", err)
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}
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return historyLines
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}
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func loadFromHistory(filePath string) ([]string, error) {
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data, err := os.ReadFile(filePath)
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if err != nil {
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if errors.Is(err, fs.ErrNotExist) {
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return nil, nil
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}
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return nil, err
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}
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linesQuoted := strings.Split(string(data), "\n")
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lines := make([]string, 0, len(linesQuoted))
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i := 0
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for _, lineQuoted := range linesQuoted {
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i++
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if lineQuoted == "" {
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continue
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}
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line, err := strconv.Unquote(lineQuoted)
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if err != nil {
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return nil, fmt.Errorf("cannot parse line #%d at %s: %w; line: [%s]", i, filePath, err, line)
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}
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lines = append(lines, line)
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}
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return lines, nil
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}
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func saveToHistory(filePath string, lines []string) error {
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linesQuoted := make([]string, len(lines))
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for i, line := range lines {
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lineQuoted := strconv.Quote(line)
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linesQuoted[i] = lineQuoted
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}
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data := strings.Join(linesQuoted, "\n")
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return os.WriteFile(filePath, []byte(data), 0600)
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}
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func isQuitCommand(s string) bool {
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switch s {
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case `\q`, "q", "quit", "exit":
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return true
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default:
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return false
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}
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}
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func isHelpCommand(s string) bool {
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switch s {
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case `\h`, "h", "help", "?":
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return true
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default:
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return false
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}
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}
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func printCommandsHelp(w io.Writer) {
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fmt.Fprintf(w, "%s", `List of available commands:
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\q - quit
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\h - show this help
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\s - singleline json output mode
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\m - multiline json output mode
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\logfmt - logfmt output mode
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`)
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}
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func executeQuery(ctx context.Context, output io.Writer, s string, outputMode outputMode) error {
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// Parse the query and convert it to canonical view.
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s = strings.TrimSuffix(s, ";")
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q, err := logstorage.ParseQuery(s)
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if err != nil {
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return fmt.Errorf("cannot parse query: %w", err)
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}
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qStr := q.String()
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fmt.Fprintf(output, "executing [%s]...", qStr)
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// Prepare HTTP request for VictoriaLogs
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args := make(url.Values)
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args.Set("query", qStr)
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data := strings.NewReader(args.Encode())
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req, err := http.NewRequestWithContext(ctx, "POST", *datasourceURL, data)
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if err != nil {
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panic(fmt.Errorf("BUG: cannot prepare request to server: %w", err))
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}
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req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
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for _, h := range headers {
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req.Header.Set(h.Name, h.Value)
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}
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// Execute HTTP request at VictoriaLogs
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startTime := time.Now()
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resp, err := httpClient.Do(req)
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queryDuration := time.Since(startTime)
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fmt.Fprintf(output, "; duration: %.3fs\n", queryDuration.Seconds())
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if err != nil {
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return fmt.Errorf("cannot execute query: %w", err)
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}
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defer func() {
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_ = resp.Body.Close()
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}()
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if resp.StatusCode != http.StatusOK {
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body, err := io.ReadAll(resp.Body)
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if err != nil {
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body = []byte(fmt.Sprintf("cannot read response body: %s", err))
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}
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return fmt.Errorf("unexpected status code: %d; response body:\n%s", resp.StatusCode, body)
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}
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// Prettify the response and stream it to 'less'.
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jp := newJSONPrettifier(resp.Body, outputMode)
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defer func() {
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_ = jp.Close()
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}()
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if err := readWithLess(jp); err != nil {
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return fmt.Errorf("error when reading query response: %w", err)
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}
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return nil
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}
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var httpClient = &http.Client{}
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var headers []headerEntry
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type headerEntry struct {
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Name string
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Value string
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}
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func parseHeaders(a []string) ([]headerEntry, error) {
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hes := make([]headerEntry, len(a))
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for i, s := range a {
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a := strings.SplitN(s, ":", 2)
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if len(a) != 2 {
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return nil, fmt.Errorf("cannot parse header=%q; it must contain at least one ':'; for example, 'Cookie: foo'", s)
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}
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hes[i] = headerEntry{
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Name: strings.TrimSpace(a[0]),
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Value: strings.TrimSpace(a[1]),
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}
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}
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return hes, nil
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}
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func fatalf(format string, args ...any) {
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fmt.Fprintf(os.Stderr, format+"\n", args...)
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os.Exit(1)
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}
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func usage() {
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const s = `
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vlogscli is a command-line tool for querying VictoriaLogs.
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See the docs at https://docs.victoriametrics.com/victorialogs/querying/vlogscli/
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`
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flagutil.Usage(s)
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}
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