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bisync: high-level retries if --resilient

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Before this change, bisync had no ability to retry in the event of sync errors.
After this change, bisync will retry if --resilient is passed, but only in one
direction at a time. We can safely retry in one direction because the source is
still intact, even if the dest was left in a messy state. If the first
direction still fails after our final retry, we abort and do NOT continue in
the other direction, to prevent the messy dest from polluting the source. If
the first direction succeeds, we do then allow retries in the other direction.

The number of retries is controllable by --retries (default 3)

bisync: high-level retries if --resilient

Before this change, bisync had no ability to retry in the event of sync errors.
After this change, bisync will retry if --resilient is passed, but only in one
direction at a time. We can safely retry in one direction because the source is
still intact, even if the dest was left in a messy state. If the first
direction still fails after our final retry, we abort and do NOT continue in
the other direction, to prevent the messy dest from polluting the source. If
the first direction succeeds, we do then allow retries in the other direction.

The number of retries is controllable by --retries (default 3)
This commit is contained in:
nielash 2023-11-10 22:56:28 -05:00
parent 98f539de8f
commit 44637dcd7f
3 changed files with 22 additions and 0 deletions
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3
cmd/bisync/cmd.go
View File

@ -46,6 +46,7 @@ type Options struct {
IgnoreListingChecksum bool
Resilient bool
TestFn TestFunc // test-only option, for mocking errors
Retries int
}
// Default values
@ -103,6 +104,7 @@ func (x *CheckSyncMode) Type() string {
var Opt Options
func init() {
Opt.Retries = 3
cmd.Root.AddCommand(commandDefinition)
cmdFlags := commandDefinition.Flags()
flags.BoolVarP(cmdFlags, &Opt.Resync, "resync", "1", Opt.Resync, "Performs the resync run. Path1 files may overwrite Path2 versions. Consider using --verbose or --dry-run first.", "")
@ -118,6 +120,7 @@ func init() {
flags.BoolVarP(cmdFlags, &Opt.NoCleanup, "no-cleanup", "", Opt.NoCleanup, "Retain working files (useful for troubleshooting and testing).", "")
flags.BoolVarP(cmdFlags, &Opt.IgnoreListingChecksum, "ignore-listing-checksum", "", Opt.IgnoreListingChecksum, "Do not use checksums for listings (add --ignore-checksum to additionally skip post-copy checksum checks)", "")
flags.BoolVarP(cmdFlags, &Opt.Resilient, "resilient", "", Opt.Resilient, "Allow future runs to retry after certain less-serious errors, instead of requiring --resync. Use at your own risk!", "")
flags.IntVarP(cmdFlags, &Opt.Retries, "retries", "", Opt.Retries, "Retry operations this many times if they fail", "")
}
// bisync command definition

8
cmd/bisync/deltas.go
View File

@ -427,6 +427,10 @@ func (b *bisyncRun) applyDeltas(ctx context.Context, ds1, ds2 *deltaSet) (change
changes1 = true
b.indent("Path2", "Path1", "Do queued copies to")
results2to1, err = b.fastCopy(ctx, b.fs2, b.fs1, copy2to1, "copy2to1")
// retries, if any
results2to1, err = b.retryFastCopy(ctx, b.fs2, b.fs1, copy2to1, "copy2to1", results2to1, err)
if err != nil {
return
}
@ -439,6 +443,10 @@ func (b *bisyncRun) applyDeltas(ctx context.Context, ds1, ds2 *deltaSet) (change
changes2 = true
b.indent("Path1", "Path2", "Do queued copies to")
results1to2, err = b.fastCopy(ctx, b.fs1, b.fs2, copy1to2, "copy1to2")
// retries, if any
results1to2, err = b.retryFastCopy(ctx, b.fs1, b.fs2, copy1to2, "copy1to2", results1to2, err)
if err != nil {
return
}

11
cmd/bisync/queue.go
View File

@ -14,6 +14,7 @@ import (
"github.com/rclone/rclone/fs/filter"
"github.com/rclone/rclone/fs/operations"
"github.com/rclone/rclone/fs/sync"
"github.com/rclone/rclone/lib/terminal"
)
// Results represents a pair of synced files, as reported by the LoggerFn
@ -182,6 +183,16 @@ func (b *bisyncRun) fastCopy(ctx context.Context, fsrc, fdst fs.Fs, files bilib.
return getResults, err
}
func (b *bisyncRun) retryFastCopy(ctx context.Context, fsrc, fdst fs.Fs, files bilib.Names, queueName string, results []Results, err error) ([]Results, error) {
if err != nil && b.opt.Resilient && b.opt.Retries > 1 {
for tries := 1; tries <= b.opt.Retries; tries++ {
fs.Logf(queueName, Color(terminal.YellowFg, "Received error: %v - retrying as --resilient is set. Retry %d/%d"), err, tries, b.opt.Retries)
results, err = b.fastCopy(ctx, fsrc, fdst, files, queueName)
}
}
return results, err
}
func (b *bisyncRun) resyncDir(ctx context.Context, fsrc, fdst fs.Fs) ([]Results, error) {
ignoreListingChecksum = b.opt.IgnoreListingChecksum
logger.LoggerFn = WriteResults