mirror of
https://github.com/rclone/rclone.git
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347 lines
11 KiB
Go
347 lines
11 KiB
Go
package operations
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import (
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"bytes"
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"context"
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"errors"
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"fmt"
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"io"
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"github.com/rclone/rclone/fs"
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"github.com/rclone/rclone/fs/hash"
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"github.com/spf13/pflag"
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)
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// Sigil represents the rune (-+=*!?) used by Logger to categorize files by their match/differ/missing status.
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type Sigil rune
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// String converts sigil to more human-readable string
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func (sigil Sigil) String() string {
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switch sigil {
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case '-':
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return "MissingOnSrc"
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case '+':
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return "MissingOnDst"
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case '=':
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return "Match"
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case '*':
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return "Differ"
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case '!':
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return "Error"
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// case '.':
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// return "Completed"
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case '?':
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return "Other"
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}
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return "unknown"
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}
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// Writer directs traffic from sigil -> LoggerOpt.Writer
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func (sigil Sigil) Writer(opt LoggerOpt) io.Writer {
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switch sigil {
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case '-':
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return opt.MissingOnSrc
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case '+':
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return opt.MissingOnDst
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case '=':
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return opt.Match
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case '*':
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return opt.Differ
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case '!':
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return opt.Error
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}
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return nil
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}
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// Sigil constants
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const (
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MissingOnSrc Sigil = '-'
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MissingOnDst Sigil = '+'
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Match Sigil = '='
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Differ Sigil = '*'
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TransferError Sigil = '!'
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Other Sigil = '?' // reserved but not currently used
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)
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// LoggerFn uses fs.DirEntry instead of fs.Object so it can include Dirs
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// For LoggerFn example, see bisync.WriteResults() or sync.SyncLoggerFn()
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// Usage example: s.logger(ctx, operations.Differ, src, dst, nil)
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type LoggerFn func(ctx context.Context, sigil Sigil, src, dst fs.DirEntry, err error)
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type loggerContextKey struct{}
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type loggerOptContextKey struct{}
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var loggerKey = loggerContextKey{}
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var loggerOptKey = loggerOptContextKey{}
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// LoggerOpt contains options for the Sync Logger functions
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// TODO: refactor Check in here too?
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type LoggerOpt struct {
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// Fdst, Fsrc fs.Fs // fses to check
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// Check checkFn // function to use for checking
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// OneWay bool // one way only?
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LoggerFn LoggerFn // function to use for logging
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Combined io.Writer // a file with file names with leading sigils
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MissingOnSrc io.Writer // files only in the destination
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MissingOnDst io.Writer // files only in the source
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Match io.Writer // matching files
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Differ io.Writer // differing files
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Error io.Writer // files with errors of some kind
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DestAfter io.Writer // files that exist on the destination post-sync
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JSON *bytes.Buffer // used by bisync to read/write struct as JSON
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DeleteModeOff bool //affects whether Logger expects MissingOnSrc to be deleted
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// lsf options for destAfter
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ListFormat ListFormat
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JSONOpt ListJSONOpt
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LJ *listJSON
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Format string
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TimeFormat string
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Separator string
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DirSlash bool
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// Recurse bool
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HashType hash.Type
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FilesOnly bool
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DirsOnly bool
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Csv bool
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Absolute bool
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}
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// WithLogger stores logger in ctx and returns a copy of ctx in which loggerKey = logger
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func WithLogger(ctx context.Context, logger LoggerFn) context.Context {
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return context.WithValue(ctx, loggerKey, logger)
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}
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// WithLoggerOpt stores loggerOpt in ctx and returns a copy of ctx in which loggerOptKey = loggerOpt
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func WithLoggerOpt(ctx context.Context, loggerOpt LoggerOpt) context.Context {
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return context.WithValue(ctx, loggerOptKey, loggerOpt)
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}
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// GetLogger attempts to retrieve LoggerFn from context, returns it if found, otherwise returns no-op function
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func GetLogger(ctx context.Context) (LoggerFn, bool) {
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logger, ok := ctx.Value(loggerKey).(LoggerFn)
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if !ok {
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logger = func(ctx context.Context, sigil Sigil, src, dst fs.DirEntry, err error) {}
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}
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return logger, ok
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}
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// GetLoggerOpt attempts to retrieve LoggerOpt from context, returns it if found, otherwise returns NewLoggerOpt()
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func GetLoggerOpt(ctx context.Context) LoggerOpt {
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loggerOpt, ok := ctx.Value(loggerOptKey).(LoggerOpt)
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if ok {
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return loggerOpt
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}
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return NewLoggerOpt()
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}
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// WithSyncLogger starts a new logger with the options passed in and saves it to ctx for retrieval later
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func WithSyncLogger(ctx context.Context, opt LoggerOpt) context.Context {
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ctx = WithLoggerOpt(ctx, opt)
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return WithLogger(ctx, func(ctx context.Context, sigil Sigil, src, dst fs.DirEntry, err error) {
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if opt.LoggerFn != nil {
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opt.LoggerFn(ctx, sigil, src, dst, err)
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} else {
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SyncFprintf(opt.Combined, "%c %s\n", sigil, dst.Remote())
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}
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})
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}
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// NewLoggerOpt returns a new LoggerOpt struct with defaults
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func NewLoggerOpt() LoggerOpt {
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opt := LoggerOpt{
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Combined: new(bytes.Buffer),
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MissingOnSrc: new(bytes.Buffer),
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MissingOnDst: new(bytes.Buffer),
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Match: new(bytes.Buffer),
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Differ: new(bytes.Buffer),
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Error: new(bytes.Buffer),
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DestAfter: new(bytes.Buffer),
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JSON: new(bytes.Buffer),
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}
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return opt
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}
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// Winner predicts which side (src or dst) should end up winning out on the dst.
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type Winner struct {
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Obj fs.DirEntry // the object that should exist on dst post-sync, if any
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Side string // whether the winning object was from the src or dst
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Err error // whether there's an error preventing us from predicting winner correctly (not whether there was a sync error more generally)
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}
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// WinningSide can be called in a LoggerFn to predict what the dest will look like post-sync
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//
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// This attempts to account for every case in which dst (intentionally) does not match src after a sync.
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//
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// Known issues / cases we can't confidently predict yet:
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//
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// --max-duration / CutoffModeHard
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// --compare-dest / --copy-dest (because equal() is called multiple times for the same file)
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// server-side moves of an entire dir at once (because we never get the individual file objects in the dir)
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// High-level retries, because there would be dupes (use --retries 1 to disable)
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// Possibly some error scenarios
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func WinningSide(ctx context.Context, sigil Sigil, src, dst fs.DirEntry, err error) Winner {
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winner := Winner{nil, "none", nil}
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opt := GetLoggerOpt(ctx)
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ci := fs.GetConfig(ctx)
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if err == fs.ErrorIsDir {
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winner.Err = err
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if sigil == MissingOnSrc {
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if (opt.DeleteModeOff || ci.DryRun) && dst != nil {
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winner.Obj = dst
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winner.Side = "dst" // whatever's on dst will remain so after DryRun
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return winner
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}
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return winner // none, because dst should just get deleted
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}
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if sigil == MissingOnDst && ci.DryRun {
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return winner // none, because it does not currently exist on dst, and will still not exist after DryRun
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} else if ci.DryRun && dst != nil {
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winner.Obj = dst
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winner.Side = "dst"
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} else if src != nil {
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winner.Obj = src
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winner.Side = "src"
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}
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return winner
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}
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_, srcOk := src.(fs.Object)
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_, dstOk := dst.(fs.Object)
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if !srcOk && !dstOk {
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return winner // none, because we don't have enough info to continue.
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}
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switch sigil {
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case MissingOnSrc:
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if opt.DeleteModeOff || ci.DryRun { // i.e. it's a copy, not sync (or it's a DryRun)
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winner.Obj = dst
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winner.Side = "dst" // whatever's on dst will remain so after DryRun
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return winner
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}
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return winner // none, because dst should just get deleted
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case Match, Differ, MissingOnDst:
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if sigil == MissingOnDst && ci.DryRun {
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return winner // none, because it does not currently exist on dst, and will still not exist after DryRun
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}
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winner.Obj = src
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winner.Side = "src" // presume dst will end up matching src unless changed below
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if sigil == Match && (ci.SizeOnly || ci.CheckSum || ci.IgnoreSize || ci.UpdateOlder || ci.NoUpdateModTime) {
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winner.Obj = dst
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winner.Side = "dst" // ignore any differences with src because of user flags
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}
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if ci.IgnoreTimes {
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winner.Obj = src
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winner.Side = "src" // copy src to dst unconditionally
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}
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if (sigil == Match || sigil == Differ) && (ci.IgnoreExisting || ci.Immutable) {
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winner.Obj = dst
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winner.Side = "dst" // dst should remain unchanged if it already exists (and we know it does because it's Match or Differ)
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}
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if ci.DryRun {
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winner.Obj = dst
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winner.Side = "dst" // dst should remain unchanged after DryRun (note that we handled MissingOnDst earlier)
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}
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return winner
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case TransferError:
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winner.Obj = dst
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winner.Side = "dst" // usually, dst should not change if there's an error
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if dst == nil {
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winner.Obj = src
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winner.Side = "src" // but if for some reason we have a src and not a dst, go with it
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}
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if winner.Obj != nil {
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if errors.Is(err, context.DeadlineExceeded) || errors.Is(err, errors.New("max transfer duration reached as set by --max-duration")) {
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winner.Err = err // we can't confidently predict what survives if CutoffModeHard
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}
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return winner // we know at least one of the objects
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}
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}
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// should only make it this far if it's TransferError and both src and dst are nil
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winner.Side = "none"
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winner.Err = fmt.Errorf("unknown case -- can't determine winner. %v", err)
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fs.Debugf(winner.Obj, "%v", winner.Err)
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return winner
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}
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// SetListFormat sets opt.ListFormat for destAfter
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// TODO: possibly refactor duplicate code from cmd/lsf, where this is mostly copied from
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func (opt *LoggerOpt) SetListFormat(ctx context.Context, cmdFlags *pflag.FlagSet) {
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// Work out if the separatorFlag was supplied or not
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separatorFlag := cmdFlags.Lookup("separator")
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separatorFlagSupplied := separatorFlag != nil && separatorFlag.Changed
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// Default the separator to , if using CSV
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if opt.Csv && !separatorFlagSupplied {
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opt.Separator = ","
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}
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var list ListFormat
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list.SetSeparator(opt.Separator)
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list.SetCSV(opt.Csv)
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list.SetDirSlash(opt.DirSlash)
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list.SetAbsolute(opt.Absolute)
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var JSONOpt = ListJSONOpt{
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NoModTime: true,
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NoMimeType: true,
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DirsOnly: opt.DirsOnly,
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FilesOnly: opt.FilesOnly,
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// Recurse: opt.Recurse,
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}
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for _, char := range opt.Format {
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switch char {
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case 'p':
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list.AddPath()
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case 't':
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list.AddModTime(opt.TimeFormat)
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JSONOpt.NoModTime = false
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case 's':
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list.AddSize()
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case 'h':
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list.AddHash(opt.HashType)
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JSONOpt.ShowHash = true
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JSONOpt.HashTypes = []string{opt.HashType.String()}
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case 'i':
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list.AddID()
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case 'm':
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list.AddMimeType()
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JSONOpt.NoMimeType = false
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case 'e':
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list.AddEncrypted()
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JSONOpt.ShowEncrypted = true
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case 'o':
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list.AddOrigID()
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JSONOpt.ShowOrigIDs = true
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case 'T':
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list.AddTier()
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case 'M':
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list.AddMetadata()
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JSONOpt.Metadata = true
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default:
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fs.Errorf(nil, "unknown format character %q", char)
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}
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}
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opt.ListFormat = list
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opt.JSONOpt = JSONOpt
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}
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// NewListJSON makes a new *listJSON for destAfter
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func (opt *LoggerOpt) NewListJSON(ctx context.Context, fdst fs.Fs, remote string) {
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opt.LJ, _ = newListJSON(ctx, fdst, remote, &opt.JSONOpt)
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//fs.Debugf(nil, "%v", opt.LJ)
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}
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// JSONEntry returns a *ListJSONItem for destAfter
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func (opt *LoggerOpt) JSONEntry(ctx context.Context, entry fs.DirEntry) (*ListJSONItem, error) {
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return opt.LJ.entry(ctx, entry)
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}
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// PrintDestAfter writes a *ListJSONItem to opt.DestAfter
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func (opt *LoggerOpt) PrintDestAfter(ctx context.Context, sigil Sigil, src, dst fs.DirEntry, err error) {
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entry := WinningSide(ctx, sigil, src, dst, err)
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if entry.Obj != nil {
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JSONEntry, _ := opt.JSONEntry(ctx, entry.Obj)
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_, _ = fmt.Fprintln(opt.DestAfter, opt.ListFormat.Format(JSONEntry))
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}
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}
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