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ChangesetOffsetWriter

reth_static_file_types

Struct ChangesetOffsetWriter 

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pub struct ChangesetOffsetWriter { /* private fields */ }
Available on Unix and crate feature std only.
Expand description

Writer for appending changeset offsets to a sidecar file.

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impl ChangesetOffsetWriter

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pub fn new(path: impl AsRef<Path>, committed_len: u64) -> Result<Self>

Opens or creates the changeset offset file for appending.

The file is healed to match committed_len (from the segment header):

  • Partial records (from crash mid-write) are truncated to record boundary
  • Extra complete records (from crash after sidecar sync but before header commit) are truncated to match the committed length
  • If the file has fewer records than committed, returns an error (data corruption)

This mirrors NippyJar’s healing behavior where config/header is the commit boundary.

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pub fn append(&mut self, offset: &ChangesetOffset) -> Result<()>

Appends a single changeset offset record.

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pub fn append_many(&mut self, offsets: &[ChangesetOffset]) -> Result<()>

Appends multiple changeset offset records.

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pub fn sync(&mut self) -> Result<()>

Syncs all data to disk. Must be called before committing the header.

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pub fn truncate(&mut self, len: u64) -> Result<()>

Truncates the file to contain exactly len records and syncs to disk. Used after prune operations to reclaim space.

The sync is required for crash safety - without it, a crash could resurrect the old file length.

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pub const fn truncate_deferred(&mut self, len: u64)

Drops records like Self::truncate, but leaves them on disk until Self::apply_pending_truncation.

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pub fn apply_pending_truncation(&mut self) -> Result<bool>

Truncates the file to the records kept by Self::truncate_deferred.

Returns false if no truncation was pending.

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pub const fn len(&self) -> u64

Returns the number of records in the file.

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pub const fn is_empty(&self) -> bool

Returns true if the file is empty.

Trait Implementations§

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impl Debug for ChangesetOffsetWriter

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

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Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 32 bytes