Alexander Renz
4c171c0e44
Features: - restore diagnose command for backup file analysis - Deep COPY block verification for truncated dump detection - PGDMP signature and gzip integrity validation - Detailed error reports with --save-debug-log flag - Ring buffer stderr capture (prevents OOM on 2M+ errors) - Error classification with actionable recommendations TUI Enhancements: - Automatic dump validity safety check before restore - Press 'd' in archive browser to diagnose backups - Press 'd' in restore preview for debug log toggle - Debug logs saved to /tmp on failure when enabled Documentation: - Updated README with diagnose command and examples - Updated CHANGELOG with full feature list - Updated restore preview screenshots
727 lines
21 KiB
Go
727 lines
21 KiB
Go
package restore
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import (
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"bufio"
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"bytes"
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"compress/gzip"
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"encoding/json"
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"fmt"
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"io"
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"os"
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"os/exec"
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"path/filepath"
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"regexp"
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"strings"
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"dbbackup/internal/logger"
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)
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// DiagnoseResult contains the results of a dump file diagnosis
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type DiagnoseResult struct {
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FilePath string `json:"file_path"`
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FileName string `json:"file_name"`
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FileSize int64 `json:"file_size"`
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Format ArchiveFormat `json:"format"`
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DetectedFormat string `json:"detected_format"`
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IsValid bool `json:"is_valid"`
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IsTruncated bool `json:"is_truncated"`
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IsCorrupted bool `json:"is_corrupted"`
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Errors []string `json:"errors,omitempty"`
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Warnings []string `json:"warnings,omitempty"`
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Details *DiagnoseDetails `json:"details,omitempty"`
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}
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// DiagnoseDetails contains detailed analysis of the dump file
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type DiagnoseDetails struct {
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// Header info
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HasPGDMPSignature bool `json:"has_pgdmp_signature,omitempty"`
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HasSQLHeader bool `json:"has_sql_header,omitempty"`
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FirstBytes string `json:"first_bytes,omitempty"`
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LastBytes string `json:"last_bytes,omitempty"`
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// COPY block analysis (for SQL dumps)
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CopyBlockCount int `json:"copy_block_count,omitempty"`
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UnterminatedCopy bool `json:"unterminated_copy,omitempty"`
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LastCopyTable string `json:"last_copy_table,omitempty"`
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LastCopyLineNumber int `json:"last_copy_line_number,omitempty"`
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SampleCopyData []string `json:"sample_copy_data,omitempty"`
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// Structure analysis
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HasCreateStatements bool `json:"has_create_statements,omitempty"`
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HasInsertStatements bool `json:"has_insert_statements,omitempty"`
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HasCopyStatements bool `json:"has_copy_statements,omitempty"`
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HasTransactionBlock bool `json:"has_transaction_block,omitempty"`
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ProperlyTerminated bool `json:"properly_terminated,omitempty"`
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// pg_restore analysis (for custom format)
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PgRestoreListable bool `json:"pg_restore_listable,omitempty"`
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PgRestoreError string `json:"pg_restore_error,omitempty"`
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TableCount int `json:"table_count,omitempty"`
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TableList []string `json:"table_list,omitempty"`
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// Compression analysis
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GzipValid bool `json:"gzip_valid,omitempty"`
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GzipError string `json:"gzip_error,omitempty"`
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ExpandedSize int64 `json:"expanded_size,omitempty"`
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CompressionRatio float64 `json:"compression_ratio,omitempty"`
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}
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// Diagnoser performs deep analysis of backup files
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type Diagnoser struct {
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log logger.Logger
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verbose bool
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}
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// NewDiagnoser creates a new diagnoser
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func NewDiagnoser(log logger.Logger, verbose bool) *Diagnoser {
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return &Diagnoser{
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log: log,
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verbose: verbose,
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}
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}
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// DiagnoseFile performs comprehensive diagnosis of a backup file
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func (d *Diagnoser) DiagnoseFile(filePath string) (*DiagnoseResult, error) {
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result := &DiagnoseResult{
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FilePath: filePath,
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FileName: filepath.Base(filePath),
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Details: &DiagnoseDetails{},
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IsValid: true, // Assume valid until proven otherwise
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}
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// Check file exists and get size
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stat, err := os.Stat(filePath)
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if err != nil {
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result.IsValid = false
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result.Errors = append(result.Errors, fmt.Sprintf("Cannot access file: %v", err))
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return result, nil
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}
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result.FileSize = stat.Size()
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if result.FileSize == 0 {
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result.IsValid = false
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result.IsTruncated = true
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result.Errors = append(result.Errors, "File is empty (0 bytes)")
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return result, nil
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}
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// Detect format
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result.Format = DetectArchiveFormat(filePath)
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result.DetectedFormat = result.Format.String()
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// Analyze based on format
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switch result.Format {
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case FormatPostgreSQLDump:
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d.diagnosePgDump(filePath, result)
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case FormatPostgreSQLDumpGz:
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d.diagnosePgDumpGz(filePath, result)
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case FormatPostgreSQLSQL:
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d.diagnoseSQLScript(filePath, false, result)
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case FormatPostgreSQLSQLGz:
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d.diagnoseSQLScript(filePath, true, result)
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case FormatClusterTarGz:
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d.diagnoseClusterArchive(filePath, result)
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default:
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result.Warnings = append(result.Warnings, "Unknown format - limited diagnosis available")
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d.diagnoseUnknown(filePath, result)
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}
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return result, nil
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}
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// diagnosePgDump analyzes PostgreSQL custom format dump
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func (d *Diagnoser) diagnosePgDump(filePath string, result *DiagnoseResult) {
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file, err := os.Open(filePath)
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if err != nil {
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result.IsValid = false
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result.Errors = append(result.Errors, fmt.Sprintf("Cannot open file: %v", err))
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return
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}
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defer file.Close()
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// Read first 512 bytes
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header := make([]byte, 512)
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n, err := file.Read(header)
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if err != nil && err != io.EOF {
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result.IsValid = false
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result.Errors = append(result.Errors, fmt.Sprintf("Cannot read header: %v", err))
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return
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}
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// Check PGDMP signature
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if n >= 5 && string(header[:5]) == "PGDMP" {
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result.Details.HasPGDMPSignature = true
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result.Details.FirstBytes = "PGDMP..."
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} else {
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result.IsValid = false
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result.IsCorrupted = true
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result.Details.HasPGDMPSignature = false
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result.Details.FirstBytes = fmt.Sprintf("%q", header[:minInt(n, 20)])
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result.Errors = append(result.Errors,
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"Missing PGDMP signature - file is NOT PostgreSQL custom format",
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"This file may be SQL format incorrectly named as .dump",
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"Try: file "+filePath+" to check actual file type")
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return
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}
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// Try pg_restore --list to verify dump integrity
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d.verifyWithPgRestore(filePath, result)
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}
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// diagnosePgDumpGz analyzes compressed PostgreSQL custom format dump
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func (d *Diagnoser) diagnosePgDumpGz(filePath string, result *DiagnoseResult) {
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file, err := os.Open(filePath)
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if err != nil {
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result.IsValid = false
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result.Errors = append(result.Errors, fmt.Sprintf("Cannot open file: %v", err))
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return
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}
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defer file.Close()
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// Verify gzip integrity
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gz, err := gzip.NewReader(file)
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if err != nil {
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result.IsValid = false
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result.IsCorrupted = true
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result.Details.GzipValid = false
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result.Details.GzipError = err.Error()
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result.Errors = append(result.Errors,
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fmt.Sprintf("Invalid gzip format: %v", err),
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"The file may be truncated or corrupted during transfer")
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return
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}
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result.Details.GzipValid = true
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// Read and check header
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header := make([]byte, 512)
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n, err := gz.Read(header)
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if err != nil && err != io.EOF {
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result.IsValid = false
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result.Errors = append(result.Errors, fmt.Sprintf("Cannot read decompressed header: %v", err))
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gz.Close()
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return
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}
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gz.Close()
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// Check PGDMP signature
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if n >= 5 && string(header[:5]) == "PGDMP" {
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result.Details.HasPGDMPSignature = true
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result.Details.FirstBytes = "PGDMP..."
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} else {
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result.Details.HasPGDMPSignature = false
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result.Details.FirstBytes = fmt.Sprintf("%q", header[:minInt(n, 20)])
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// Check if it's actually SQL content
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content := string(header[:n])
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if strings.Contains(content, "PostgreSQL") || strings.Contains(content, "pg_dump") ||
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strings.Contains(content, "SET ") || strings.Contains(content, "CREATE ") {
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result.Details.HasSQLHeader = true
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result.Warnings = append(result.Warnings,
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"File contains SQL text but has .dump extension",
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"This appears to be SQL format, not custom format",
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"Restore should use psql, not pg_restore")
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} else {
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result.IsValid = false
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result.IsCorrupted = true
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result.Errors = append(result.Errors,
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"Missing PGDMP signature in decompressed content",
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"File is neither custom format nor valid SQL")
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}
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return
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}
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// Verify full gzip stream integrity by reading to end
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file.Seek(0, 0)
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gz, _ = gzip.NewReader(file)
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var totalRead int64
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buf := make([]byte, 32*1024)
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for {
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n, err := gz.Read(buf)
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totalRead += int64(n)
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if err == io.EOF {
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break
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}
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if err != nil {
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result.IsValid = false
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result.IsTruncated = true
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result.Details.ExpandedSize = totalRead
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result.Errors = append(result.Errors,
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fmt.Sprintf("Gzip stream truncated after %d bytes: %v", totalRead, err),
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"The backup file appears to be incomplete",
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"Check if backup process completed successfully")
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gz.Close()
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return
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}
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}
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gz.Close()
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result.Details.ExpandedSize = totalRead
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if result.FileSize > 0 {
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result.Details.CompressionRatio = float64(totalRead) / float64(result.FileSize)
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}
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}
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// diagnoseSQLScript analyzes SQL script format
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func (d *Diagnoser) diagnoseSQLScript(filePath string, compressed bool, result *DiagnoseResult) {
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var reader io.Reader
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var file *os.File
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var gz *gzip.Reader
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var err error
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file, err = os.Open(filePath)
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if err != nil {
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result.IsValid = false
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result.Errors = append(result.Errors, fmt.Sprintf("Cannot open file: %v", err))
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return
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}
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defer file.Close()
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if compressed {
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gz, err = gzip.NewReader(file)
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if err != nil {
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result.IsValid = false
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result.IsCorrupted = true
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result.Details.GzipValid = false
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result.Details.GzipError = err.Error()
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result.Errors = append(result.Errors, fmt.Sprintf("Invalid gzip format: %v", err))
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return
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}
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result.Details.GzipValid = true
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reader = gz
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defer gz.Close()
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} else {
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reader = file
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}
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// Analyze SQL content
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scanner := bufio.NewScanner(reader)
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// Increase buffer size for large lines (COPY data can have long lines)
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buf := make([]byte, 0, 1024*1024)
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scanner.Buffer(buf, 10*1024*1024)
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var lineNumber int
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var inCopyBlock bool
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var lastCopyTable string
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var copyStartLine int
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var copyDataSamples []string
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copyBlockPattern := regexp.MustCompile(`^COPY\s+("?[\w\."]+)"?\s+\(`)
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copyEndPattern := regexp.MustCompile(`^\\\.`)
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for scanner.Scan() {
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lineNumber++
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line := scanner.Text()
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// Check first few lines for header
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if lineNumber <= 10 {
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if strings.Contains(line, "PostgreSQL") || strings.Contains(line, "pg_dump") {
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result.Details.HasSQLHeader = true
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}
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}
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// Track structure
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upperLine := strings.ToUpper(strings.TrimSpace(line))
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if strings.HasPrefix(upperLine, "CREATE ") {
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result.Details.HasCreateStatements = true
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}
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if strings.HasPrefix(upperLine, "INSERT ") {
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result.Details.HasInsertStatements = true
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}
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if strings.HasPrefix(upperLine, "BEGIN") {
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result.Details.HasTransactionBlock = true
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}
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// Track COPY blocks
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if copyBlockPattern.MatchString(line) {
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if inCopyBlock {
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// Previous COPY block wasn't terminated!
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result.Details.UnterminatedCopy = true
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result.IsTruncated = true
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result.IsValid = false
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result.Errors = append(result.Errors,
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fmt.Sprintf("COPY block for '%s' starting at line %d was never terminated",
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lastCopyTable, copyStartLine))
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}
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inCopyBlock = true
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result.Details.HasCopyStatements = true
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result.Details.CopyBlockCount++
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matches := copyBlockPattern.FindStringSubmatch(line)
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if len(matches) > 1 {
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lastCopyTable = matches[1]
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}
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copyStartLine = lineNumber
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copyDataSamples = nil
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} else if copyEndPattern.MatchString(line) {
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inCopyBlock = false
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} else if inCopyBlock {
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// We're in COPY data
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if len(copyDataSamples) < 3 {
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copyDataSamples = append(copyDataSamples, truncateString(line, 100))
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}
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}
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// Store last line for termination check
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if lineNumber > 0 && (lineNumber%100000 == 0) && d.verbose {
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d.log.Debug("Scanning SQL file", "lines_processed", lineNumber)
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}
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}
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if err := scanner.Err(); err != nil {
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result.IsValid = false
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result.IsTruncated = true
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result.Errors = append(result.Errors,
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fmt.Sprintf("Error reading file at line %d: %v", lineNumber, err),
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"File may be truncated or contain invalid data")
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}
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// Check if we ended while still in a COPY block
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if inCopyBlock {
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result.Details.UnterminatedCopy = true
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result.Details.LastCopyTable = lastCopyTable
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result.Details.LastCopyLineNumber = copyStartLine
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result.Details.SampleCopyData = copyDataSamples
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result.IsTruncated = true
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result.IsValid = false
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result.Errors = append(result.Errors,
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fmt.Sprintf("File ends inside COPY block for table '%s' (started at line %d)",
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lastCopyTable, copyStartLine),
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"The backup was truncated during data export",
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"This explains the 'syntax error' during restore - COPY data is being interpreted as SQL")
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if len(copyDataSamples) > 0 {
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result.Errors = append(result.Errors,
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fmt.Sprintf("Sample orphaned data: %s", copyDataSamples[0]))
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}
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} else {
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result.Details.ProperlyTerminated = true
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}
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// Read last bytes for additional context
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if !compressed {
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file.Seek(-min(500, result.FileSize), 2)
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lastBytes := make([]byte, 500)
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n, _ := file.Read(lastBytes)
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result.Details.LastBytes = strings.TrimSpace(string(lastBytes[:n]))
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}
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}
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// diagnoseClusterArchive analyzes a cluster tar.gz archive
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func (d *Diagnoser) diagnoseClusterArchive(filePath string, result *DiagnoseResult) {
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// First verify tar.gz integrity
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cmd := exec.Command("tar", "-tzf", filePath)
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output, err := cmd.Output()
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if err != nil {
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result.IsValid = false
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result.IsCorrupted = true
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result.Errors = append(result.Errors,
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fmt.Sprintf("Tar archive is invalid or corrupted: %v", err),
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"Run: tar -tzf "+filePath+" 2>&1 | tail -20")
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return
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}
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// Parse tar listing
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files := strings.Split(strings.TrimSpace(string(output)), "\n")
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var dumpFiles []string
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hasGlobals := false
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hasMetadata := false
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for _, f := range files {
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if strings.HasSuffix(f, ".dump") || strings.HasSuffix(f, ".sql.gz") {
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dumpFiles = append(dumpFiles, f)
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}
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if strings.Contains(f, "globals.sql") {
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hasGlobals = true
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}
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if strings.Contains(f, "manifest.json") || strings.Contains(f, "metadata.json") {
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hasMetadata = true
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}
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}
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result.Details.TableCount = len(dumpFiles)
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result.Details.TableList = dumpFiles
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if len(dumpFiles) == 0 {
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result.Warnings = append(result.Warnings, "No database dump files found in archive")
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}
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if !hasGlobals {
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result.Warnings = append(result.Warnings, "No globals.sql found - roles/tablespaces won't be restored")
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}
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if !hasMetadata {
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result.Warnings = append(result.Warnings, "No manifest/metadata found - limited validation possible")
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}
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// For verbose mode, diagnose individual dumps inside the archive
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if d.verbose && len(dumpFiles) > 0 {
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d.log.Info("Cluster archive contains databases", "count", len(dumpFiles))
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for _, df := range dumpFiles {
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d.log.Info(" - " + df)
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}
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}
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}
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// diagnoseUnknown handles unknown format files
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func (d *Diagnoser) diagnoseUnknown(filePath string, result *DiagnoseResult) {
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file, err := os.Open(filePath)
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if err != nil {
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return
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}
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defer file.Close()
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header := make([]byte, 512)
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n, _ := file.Read(header)
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result.Details.FirstBytes = fmt.Sprintf("%q", header[:minInt(n, 50)])
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// Try to identify by content
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content := string(header[:n])
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if strings.Contains(content, "PGDMP") {
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result.Warnings = append(result.Warnings, "File appears to be PostgreSQL custom format - rename to .dump")
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} else if strings.Contains(content, "PostgreSQL") || strings.Contains(content, "pg_dump") {
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result.Warnings = append(result.Warnings, "File appears to be PostgreSQL SQL - rename to .sql")
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} else if bytes.HasPrefix(header, []byte{0x1f, 0x8b}) {
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result.Warnings = append(result.Warnings, "File appears to be gzip compressed - add .gz extension")
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}
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}
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// verifyWithPgRestore uses pg_restore --list to verify dump integrity
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func (d *Diagnoser) verifyWithPgRestore(filePath string, result *DiagnoseResult) {
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cmd := exec.Command("pg_restore", "--list", filePath)
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output, err := cmd.CombinedOutput()
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if err != nil {
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result.Details.PgRestoreListable = false
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result.Details.PgRestoreError = string(output)
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// Check for specific errors
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errStr := string(output)
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if strings.Contains(errStr, "unexpected end of file") ||
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strings.Contains(errStr, "invalid large-object TOC entry") {
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result.IsTruncated = true
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result.IsValid = false
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result.Errors = append(result.Errors,
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"pg_restore reports truncated or incomplete dump file",
|
||
fmt.Sprintf("Error: %s", truncateString(errStr, 200)))
|
||
} else if strings.Contains(errStr, "not a valid archive") {
|
||
result.IsCorrupted = true
|
||
result.IsValid = false
|
||
result.Errors = append(result.Errors,
|
||
"pg_restore reports file is not a valid archive",
|
||
"File may be corrupted or wrong format")
|
||
} else {
|
||
result.Warnings = append(result.Warnings,
|
||
fmt.Sprintf("pg_restore --list warning: %s", truncateString(errStr, 200)))
|
||
}
|
||
return
|
||
}
|
||
|
||
result.Details.PgRestoreListable = true
|
||
|
||
// Count tables in the TOC
|
||
lines := strings.Split(string(output), "\n")
|
||
tableCount := 0
|
||
var tables []string
|
||
for _, line := range lines {
|
||
if strings.Contains(line, " TABLE DATA ") {
|
||
tableCount++
|
||
if len(tables) < 20 {
|
||
parts := strings.Fields(line)
|
||
if len(parts) > 3 {
|
||
tables = append(tables, parts[len(parts)-1])
|
||
}
|
||
}
|
||
}
|
||
}
|
||
result.Details.TableCount = tableCount
|
||
result.Details.TableList = tables
|
||
}
|
||
|
||
// DiagnoseClusterDumps extracts and diagnoses all dumps in a cluster archive
|
||
func (d *Diagnoser) DiagnoseClusterDumps(archivePath, tempDir string) ([]*DiagnoseResult, error) {
|
||
// Extract to temp directory
|
||
cmd := exec.Command("tar", "-xzf", archivePath, "-C", tempDir)
|
||
if err := cmd.Run(); err != nil {
|
||
return nil, fmt.Errorf("failed to extract archive: %w", err)
|
||
}
|
||
|
||
// Find dump files
|
||
dumpsDir := filepath.Join(tempDir, "dumps")
|
||
entries, err := os.ReadDir(dumpsDir)
|
||
if err != nil {
|
||
// Try without dumps subdirectory
|
||
entries, err = os.ReadDir(tempDir)
|
||
if err != nil {
|
||
return nil, fmt.Errorf("cannot read extracted files: %w", err)
|
||
}
|
||
dumpsDir = tempDir
|
||
}
|
||
|
||
var results []*DiagnoseResult
|
||
for _, entry := range entries {
|
||
if entry.IsDir() {
|
||
continue
|
||
}
|
||
|
||
name := entry.Name()
|
||
if !strings.HasSuffix(name, ".dump") && !strings.HasSuffix(name, ".sql.gz") &&
|
||
!strings.HasSuffix(name, ".sql") {
|
||
continue
|
||
}
|
||
|
||
dumpPath := filepath.Join(dumpsDir, name)
|
||
d.log.Info("Diagnosing dump file", "file", name)
|
||
|
||
result, err := d.DiagnoseFile(dumpPath)
|
||
if err != nil {
|
||
d.log.Warn("Failed to diagnose file", "file", name, "error", err)
|
||
continue
|
||
}
|
||
results = append(results, result)
|
||
}
|
||
|
||
return results, nil
|
||
}
|
||
|
||
// PrintDiagnosis outputs a human-readable diagnosis report
|
||
func (d *Diagnoser) PrintDiagnosis(result *DiagnoseResult) {
|
||
fmt.Println("\n" + strings.Repeat("=", 70))
|
||
fmt.Printf("📋 DIAGNOSIS: %s\n", result.FileName)
|
||
fmt.Println(strings.Repeat("=", 70))
|
||
|
||
// Basic info
|
||
fmt.Printf("\nFile: %s\n", result.FilePath)
|
||
fmt.Printf("Size: %s\n", formatBytes(result.FileSize))
|
||
fmt.Printf("Format: %s\n", result.DetectedFormat)
|
||
|
||
// Status
|
||
if result.IsValid {
|
||
fmt.Println("\n✅ STATUS: VALID")
|
||
} else {
|
||
fmt.Println("\n❌ STATUS: INVALID")
|
||
}
|
||
|
||
if result.IsTruncated {
|
||
fmt.Println("⚠️ TRUNCATED: Yes - file appears incomplete")
|
||
}
|
||
if result.IsCorrupted {
|
||
fmt.Println("⚠️ CORRUPTED: Yes - file structure is damaged")
|
||
}
|
||
|
||
// Details
|
||
if result.Details != nil {
|
||
fmt.Println("\n📊 DETAILS:")
|
||
|
||
if result.Details.HasPGDMPSignature {
|
||
fmt.Println(" ✓ Has PGDMP signature (PostgreSQL custom format)")
|
||
}
|
||
if result.Details.HasSQLHeader {
|
||
fmt.Println(" ✓ Has PostgreSQL SQL header")
|
||
}
|
||
if result.Details.GzipValid {
|
||
fmt.Println(" ✓ Gzip compression valid")
|
||
}
|
||
if result.Details.PgRestoreListable {
|
||
fmt.Printf(" ✓ pg_restore can list contents (%d tables)\n", result.Details.TableCount)
|
||
}
|
||
if result.Details.CopyBlockCount > 0 {
|
||
fmt.Printf(" • Contains %d COPY blocks\n", result.Details.CopyBlockCount)
|
||
}
|
||
if result.Details.UnterminatedCopy {
|
||
fmt.Printf(" ✗ Unterminated COPY block: %s (line %d)\n",
|
||
result.Details.LastCopyTable, result.Details.LastCopyLineNumber)
|
||
}
|
||
if result.Details.ProperlyTerminated {
|
||
fmt.Println(" ✓ All COPY blocks properly terminated")
|
||
}
|
||
if result.Details.ExpandedSize > 0 {
|
||
fmt.Printf(" • Expanded size: %s (ratio: %.1fx)\n",
|
||
formatBytes(result.Details.ExpandedSize), result.Details.CompressionRatio)
|
||
}
|
||
}
|
||
|
||
// Errors
|
||
if len(result.Errors) > 0 {
|
||
fmt.Println("\n❌ ERRORS:")
|
||
for _, e := range result.Errors {
|
||
fmt.Printf(" • %s\n", e)
|
||
}
|
||
}
|
||
|
||
// Warnings
|
||
if len(result.Warnings) > 0 {
|
||
fmt.Println("\n⚠️ WARNINGS:")
|
||
for _, w := range result.Warnings {
|
||
fmt.Printf(" • %s\n", w)
|
||
}
|
||
}
|
||
|
||
// Recommendations
|
||
if !result.IsValid {
|
||
fmt.Println("\n💡 RECOMMENDATIONS:")
|
||
if result.IsTruncated {
|
||
fmt.Println(" 1. Re-run the backup process for this database")
|
||
fmt.Println(" 2. Check disk space on backup server during backup")
|
||
fmt.Println(" 3. Verify network stability if backup was remote")
|
||
fmt.Println(" 4. Check backup logs for errors during the backup")
|
||
}
|
||
if result.IsCorrupted {
|
||
fmt.Println(" 1. Verify backup file was transferred completely")
|
||
fmt.Println(" 2. Check if backup file was modified after creation")
|
||
fmt.Println(" 3. Try restoring from a previous backup")
|
||
}
|
||
}
|
||
|
||
fmt.Println(strings.Repeat("=", 70))
|
||
}
|
||
|
||
// PrintDiagnosisJSON outputs diagnosis as JSON
|
||
func (d *Diagnoser) PrintDiagnosisJSON(result *DiagnoseResult) error {
|
||
output, err := json.MarshalIndent(result, "", " ")
|
||
if err != nil {
|
||
return err
|
||
}
|
||
fmt.Println(string(output))
|
||
return nil
|
||
}
|
||
|
||
// Helper functions
|
||
|
||
func truncateString(s string, maxLen int) string {
|
||
if len(s) <= maxLen {
|
||
return s
|
||
}
|
||
return s[:maxLen-3] + "..."
|
||
}
|
||
|
||
func formatBytes(bytes int64) string {
|
||
const unit = 1024
|
||
if bytes < unit {
|
||
return fmt.Sprintf("%d B", bytes)
|
||
}
|
||
div, exp := int64(unit), 0
|
||
for n := bytes / unit; n >= unit; n /= unit {
|
||
div *= unit
|
||
exp++
|
||
}
|
||
return fmt.Sprintf("%.1f %cB", float64(bytes)/float64(div), "KMGTPE"[exp])
|
||
}
|
||
|
||
func min(a, b int64) int64 {
|
||
if a < b {
|
||
return a
|
||
}
|
||
return b
|
||
}
|
||
|
||
func minInt(a, b int) int {
|
||
if a < b {
|
||
return a
|
||
}
|
||
return b
|
||
}
|