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Project File Structure Analysis

This document outlines the file structure of the BadgerDB project, providing a visual representation and explanation of the organization.

Visual File Structure​

.
├── backup.go
├── backup_test.go
├── badger
│   └── cmd
│       ├── backup.go
│       ├── bank.go
│       ├── bench.go
│       ├── flatten.go
│       ├── info.go
│       ├── pick_table_bench.go
│       ├── read_bench.go
│       ├── restore.go
│       ├── root.go
│       ├── rotate.go
│       ├── rotate_test.go
│       ├── stream.go
│       └── write_bench.go
├── badger/main.go
├── batch.go
├── batch_test.go
├── changes.sh
├── compaction.go
├── db.go
├── db2_test.go
├── db_test.go
├── dir_other.go
├── dir_plan9.go
├── dir_unix.go
├── dir_windows.go
├── discard.go
├── discard_test.go
├── doc.go
├── errors.go
├── fb
│   ├── BlockOffset.go
│   ├── TableIndex.go
│   ├── gen.sh
│   └── install_flatbuffers.sh
├── histogram.go
├── histogram_test.go
├── integration
│   └── testgc
│       └── main.go
├── iterator.go
├── iterator_test.go
├── key_registry.go
├── key_registry_test.go
├── level_handler.go
├── levels.go
├── levels_test.go
├── logger.go
├── logger_test.go
├── managed_db.go
├── managed_db_test.go
├── manifest.go
├── manifest_test.go
├── memtable.go
├── merge.go
├── merge_test.go
├── metrics_test.go
├── options
│   └── options.go
├── options.go
├── options_test.go
├── pb
│   ├── badgerpb4.pb.go
│   ├── gen.sh
│   └── protos_test.go
├── publisher.go
├── publisher_test.go
├── skl
│   ├── arena.go
│   ├── skl.go
│   └── skl_test.go
├── stream.go
├── stream_test.go
├── stream_writer.go
├── stream_writer_test.go
├── structs.go
├── structs_test.go
├── table
│   ├── builder.go
│   ├── builder_test.go
│   ├── iterator.go
│   ├── merge_iterator.go
│   ├── merge_iterator_test.go
│   ├── table.go
│   └── table_test.go
├── test.sh
├── test_extensions.go
├── trie
│   ├── trie.go
│   └── trie_test.go
├── txn.go
├── txn_test.go
├── util.go
├── value.go
├── value_test.go
├── watermark_edge_test.go
├── y
│   ├── bloom.go
│   ├── bloom_test.go
│   ├── checksum.go
│   ├── encrypt.go
│   ├── encrypt_test.go
│   ├── error.go
│   ├── error_test.go
│   ├── event_log.go
│   ├── file_dsync.go
│   ├── file_nodsync.go
│   ├── iterator.go
│   ├── metrics.go
│   ├── watermark.go
│   ├── y.go
│   ├── y_test.go
│   └── zstd.go

Explanation of Organization​

The BadgerDB project is organized into several key directories and files at the root level, each serving a distinct purpose:

  • Root Level Files: These files represent the core functionalities of the database, related utilities, and entry points.

    • *.go: Core source code files (e.g., backup.go, batch.go, db.go). These files define the fundamental logic for database operations, data structures, and algorithms.
    • *_test.go: Unit tests for corresponding source code files, ensuring the correctness and reliability of the implemented functionalities.
    • changes.sh, test.sh: Shell scripts for automating tasks like generating changelogs and running tests.
    • doc.go: Documents the package level.

  • badger/cmd Directory: Contains command-line interface (CLI) tools for interacting with the BadgerDB database.

    • Each .go file in this directory represents a specific command (e.g., backup.go, restore.go, bench.go).
    • root.go: Defines the root command and global flags for the CLI application.
    • *_test.go: Unit tests for CLI command functionalities.
    • badger/main.go: This is likely the entrypoint for the badger executable built from badger/cmd. It ties together all the CLI commands and sets up the environment.

  • fb Directory: Likely related to FlatBuffers schema definitions for efficient data serialization.

    • .go files: Go implementations of FlatBuffers structures.
    • gen.sh: Script to generate Go code from FlatBuffers schema definitions.
    • install_flatbuffers.sh: Script to install the FlatBuffers compiler.

  • integration Directory: Contains integration tests that verify the interaction between different components of the database.

    • testgc: Contains an integration test specifically for garbage collection.

  • options Directory: Defines configuration options and settings for the BadgerDB database.

    • options.go: Defines the structure of configurable options.

  • pb Directory: Contains protocol buffer (protobuf) definitions for data serialization and communication.

    • .proto files: Defines the protobuf schema.
    • badgerpb4.pb.go: Generated Go code from the protobuf schema.
    • gen.sh: Script to generate Go code from the protobuf definitions.

  • skl Directory: Implements a Skip List data structure, which is likely used as an in-memory index within BadgerDB.

    • skl.go: Implementation of the Skip List.
    • arena.go: Likely an arena allocator used by the Skip List for memory management.

  • table Directory: Deals with the table format used for storing data on disk.

    • builder.go: Logic for building tables.
    • iterator.go: Interface for iterating over data within a table.
    • table.go: Defines the table data structure and related functions.

  • trie Directory: Implements a Trie data structure, potentially used for indexing or other advanced features.

  • y Directory: This directory name is intentionally short and possibly named after the main author's initial to suggest utilities. It contains low-level utility functions and helper libraries used throughout the project.

    • Contains functions for checksumming, encryption, error handling, bloom filters, and other common tasks.

In general, files that end with _test.go contain unit tests for the associated source code files. This structure promotes modularity, testability, and maintainability. The separation of command-line tools into the cmd directory, FlatBuffers definitions into fb, protocol buffer definitions into pb, and utilities into y shows a clear concern for separation of concerns.