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package profile
import (
"bufio"
"flag"
"fmt"
"os"
"os/exec"
"path/filepath"
"sort"
"strings"
"github.com/mimecast/dtail/internal/tools/common"
)
// Info holds information about a profile file.
type Info struct {
Path string
Tool string
Type string // cpu, mem, alloc
ModTime string
Size int64
}
func runAnalyze(cfg *Config) error {
args := flag.Args()
if len(args) == 0 {
return fmt.Errorf("no profile file specified")
}
profilePath := args[0]
if !common.FileExists(profilePath) {
return fmt.Errorf("profile file not found: %s", profilePath)
}
// Determine if web mode requested
for _, arg := range args[1:] {
if arg == "-web" || arg == "--web" {
return openWebProfile(profilePath)
}
}
// Default to text analysis
return analyzeProfile(profilePath, args[1:]...)
}
func listProfiles(cfg *Config) error {
common.PrintSection("Available Profiles")
profiles, err := findProfiles(cfg.ProfileDir)
if err != nil {
return err
}
if len(profiles) == 0 {
fmt.Printf("No profiles found in %s\n", cfg.ProfileDir)
return nil
}
// Group by tool
byTool := make(map[string][]Info)
for _, p := range profiles {
byTool[p.Tool] = append(byTool[p.Tool], p)
}
// Sort tools
var tools []string
for tool := range byTool {
tools = append(tools, tool)
}
sort.Strings(tools)
// Display profiles
for _, tool := range tools {
fmt.Printf("\n%s profiles:\n", tool)
toolProfiles := byTool[tool]
// Sort by modification time (newest first)
sort.Slice(toolProfiles, func(i, j int) bool {
return toolProfiles[i].ModTime > toolProfiles[j].ModTime
})
for _, p := range toolProfiles {
fmt.Printf(" %-8s %s %8s %s\n",
p.Type, p.ModTime, common.FormatSize(p.Size), filepath.Base(p.Path))
}
}
fmt.Printf("\nTotal: %d profiles\n", len(profiles))
fmt.Printf("\nUsage: dtail-tools profile -mode analyze <profile_file>\n")
return nil
}
func findProfiles(dir string) ([]Info, error) {
var profiles []Info
pattern := filepath.Join(dir, "*.prof")
matches, err := filepath.Glob(pattern)
if err != nil {
return nil, err
}
for _, path := range matches {
info, err := os.Stat(path)
if err != nil {
continue
}
// Parse filename to extract tool and type
base := filepath.Base(path)
parts := strings.Split(base, "_")
if len(parts) < 3 {
continue
}
tool := parts[0]
profType := parts[1]
profiles = append(profiles, Info{
Path: path,
Tool: tool,
Type: profType,
ModTime: info.ModTime().Format("2006-01-02 15:04:05"),
Size: info.Size(),
})
}
return profiles, nil
}
func analyzeProfile(profilePath string, args ...string) error {
// Detect profile type
isMemProfile := strings.Contains(profilePath, "_mem_") || strings.Contains(profilePath, "_alloc_")
fmt.Printf("Analyzing %s\n", profilePath)
fmt.Println(strings.Repeat("-", 60))
// Default analysis
if err := showTopFunctions(profilePath, 10, isMemProfile); err != nil {
return err
}
// Show tips
fmt.Println("\nAnalysis tips:")
if isMemProfile {
fmt.Println(" - Use -alloc_space to see total allocations")
fmt.Println(" - Use -alloc_objects to see allocation counts")
fmt.Println(" - Use -inuse_space to see current memory usage")
} else {
fmt.Println(" - Use -cum to sort by cumulative time")
fmt.Println(" - Use -list <function> to see source code")
fmt.Println(" - Use -web to open interactive flame graph")
}
return nil
}
func showTopFunctions(profilePath string, count int, isMemProfile bool) error {
args := []string{"tool", "pprof", "-top", fmt.Sprintf("-nodecount=%d", count)}
if isMemProfile {
args = append(args, "-alloc_space")
}
args = append(args, profilePath)
cmd := exec.Command("go", args...)
output, err := cmd.Output()
if err != nil {
return fmt.Errorf("pprof failed: %w", err)
}
// Parse and display output
scanner := bufio.NewScanner(strings.NewReader(string(output)))
lineCount := 0
inTop := false
fmt.Printf("Top %d functions (sorted by flat):\n", count)
fmt.Println("================================================================")
for scanner.Scan() {
line := scanner.Text()
// Skip header lines
if strings.HasPrefix(line, "File:") || strings.HasPrefix(line, "Type:") ||
strings.HasPrefix(line, "Time:") || strings.HasPrefix(line, "Duration:") {
continue
}
// Start printing from the table header
if strings.Contains(line, "flat") && strings.Contains(line, "cum") {
inTop = true
fmt.Println("# Command: go " + strings.Join(args[1:], " "))
}
if inTop {
fmt.Println(line)
if line != "" {
lineCount++
}
if lineCount > count+2 { // +2 for header and separator
break
}
}
}
return nil
}
func openWebProfile(profilePath string) error {
fmt.Printf("Starting pprof web server for %s...\n", profilePath)
fmt.Println("Opening http://localhost:8080 in your browser")
fmt.Println("Press Ctrl+C to stop")
cmd := exec.Command("go", "tool", "pprof", "-http=:8080", profilePath)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
return cmd.Run()
}
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