Struct MongoConfig 

pub struct MongoConfig {
    pub json: MongoJsonMode,
    pub read_concern: MongoReadConcern,
    pub no_cursor_timeout: bool,
    pub page_size: Option<usize>,
    pub resume: bool,
}

MongoDB read-path knobs. All three address completeness/fidelity of a full collection export that the SQL engines get for free from SQL semantics.

Fields

json: MongoJsonMode

JSON rendering of the document column. relaxed (default) keeps common scalars native (42, "x"); canonical wraps every number ({"$numberLong":"…"}) so Int64/Double round-trip losslessly through a JSON-number parser that would otherwise clamp values beyond 2^53.

read_concern: MongoReadConcern

Read concern for the collection scan. snapshot gives a point-in-time consistent full export (no doc missed/double-read under concurrent writes) — requires MongoDB 5.0+ on a replica set; a standalone rejects it. Default (server) uses the server’s default read concern.

no_cursor_timeout: bool

Keep the scan cursor alive past the server’s idle timeout (default 10 min) so a slow destination cannot let the server reap the cursor mid-scan and silently drop the tail of a large collection. Default: true.

page_size: Option<usize>

When set, read the collection with keyset (seek) pagination on _id instead of one long-held cursor: each page is a bounded find({_id: {$gt: last}}).sort({_id: 1}).limit(page_size) — an indexed range scan that becomes one output part file. Bounds longest-query time (no 35-minute cursor to hit a timeout / snapshot window) and is the base for parallel _id-range reads. Requires an ObjectId _id (the default); a non-ObjectId key errors with a clear message. Unset ⇒ the single-cursor full scan.

resume: bool

With keyset paging (page_size), persist the last committed _id and resume from it next run — a crashed export continues where it left off, and a re-run captures only documents inserted since (ObjectId _id is time-ordered). Default false re-reads the whole collection each run (plain mode: full semantics). No effect without page_size.

Trait Implementations

impl Clone for MongoConfig

fn clone(&self) -> MongoConfig

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for MongoConfig

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

Formats the value using the given formatter.

impl Default for MongoConfig

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for MongoConfig

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl JsonSchema for MongoConfig

fn schema_name() -> Cow<'static, str>

The name of the generated JSON Schema.

fn schema_id() -> Cow<'static, str>

Returns a string that uniquely identifies the schema produced by this type.

fn json_schema(generator: &mut SchemaGenerator) -> Schema

Generates a JSON Schema for this type.

fn inline_schema() -> bool

Whether JSON Schemas generated for this type should be included directly in parent schemas, rather than being re-used where possible using the $ref keyword.

impl Serialize for MongoConfig

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

where __S: Serializer,

Serialize this value into the given Serde serializer.