Struct LogEntry 

pub struct LogEntry {
    pub cmd: String,
    pub collection: String,
    pub key: String,
    pub value: Value,
    pub _t: u64,
}

The atomic unit of data in MoltenDB’s append-only log.

Every mutation to the database is recorded as a LogEntry appended to the log file. On startup, the log is replayed from top to bottom to rebuild the in-memory state. This is the “log-structured” part of MoltenDB.

The four command types and their meanings:

“INSERT” — insert or overwrite a document. collection = which collection, key = document ID, value = the full JSON document.

“DELETE” — delete a single document. collection + key identify the document; value is null.

“DROP” — delete an entire collection. collection = which collection; key and value are unused.

“INDEX” — record that an index was created on a field. collection = which collection, key = field name, value is null. The index data itself is rebuilt from the INSERT entries during replay.

“TX_BEGIN” — marks the start of an atomic batch transaction. key = transaction ID (e.g. UUID).

“SCHEMA” — register a JSON schema for a collection. collection = which collection, value = the schema JSON.

“ENC” — a sentinel used by EncryptedStorage. The real LogEntry is encrypted inside value as a base64 string. The engine never sees ENC entries directly — EncryptedStorage decrypts them before returning them from read_log().

Fields

cmd: String

The command type: “INSERT”, “DELETE”, “DROP”, “INDEX”, “TX_BEGIN”, “TX_COMMIT” or “ENC”.

collection: String

The name of the collection this entry belongs to.

key: String

The document key (for INSERT/DELETE) or field name (for INDEX).

value: Value

The document value (for INSERT) or null (for DELETE/DROP/INDEX). For ENC entries, this holds the base64-encoded ciphertext.

_t: u64

Engine-level timestamp (Unix milliseconds) for Point-in-Time Recovery.

Implementations

impl LogEntry

pub fn new(cmd: String, collection: String, key: String, value: Value) -> Self

Create a new LogEntry with the current timestamp.

Trait Implementations

impl Clone for LogEntry

fn clone(&self) -> LogEntry

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for LogEntry

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for LogEntry

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for LogEntry

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.