mongodb 2.0.0

The official MongoDB driver for Rust
Documentation 
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use bson::Document;

use crate::{
    bson::doc,
    cmap::{Command, StreamDescription},
    error::Result,
    operation::{Operation, Retryability},
    options::WriteConcern,
    selection_criteria::SelectionCriteria,
};

use super::{CommandResponse, Response, WriteConcernOnlyBody};

pub(crate) struct AbortTransaction {
    write_concern: Option<WriteConcern>,
    selection_criteria: Option<SelectionCriteria>,
}

impl AbortTransaction {
    pub(crate) fn new(
        write_concern: Option<WriteConcern>,
        selection_criteria: Option<SelectionCriteria>,
    ) -> Self {
        Self {
            write_concern,
            selection_criteria,
        }
    }
}

impl Operation for AbortTransaction {
    type O = ();
    type Command = Document;
    type Response = CommandResponse<WriteConcernOnlyBody>;

    const NAME: &'static str = "abortTransaction";

    fn build(&mut self, _description: &StreamDescription) -> Result<Command> {
        let mut body = doc! {
            Self::NAME: 1,
        };
        if let Some(ref write_concern) = self.write_concern {
            body.insert("writeConcern", bson::to_bson(write_concern)?);
        }

        Ok(Command::new(
            Self::NAME.to_string(),
            "admin".to_string(),
            body,
        ))
    }

    fn handle_response(
        &self,
        response: <Self::Response as Response>::Body,
        _description: &StreamDescription,
    ) -> Result<Self::O> {
        response.validate()
    }

    fn selection_criteria(&self) -> Option<&SelectionCriteria> {
        self.selection_criteria.as_ref()
    }

    fn write_concern(&self) -> Option<&WriteConcern> {
        self.write_concern.as_ref()
    }

    fn retryability(&self) -> Retryability {
        Retryability::Write
    }

    fn update_for_retry(&mut self) {
        // The session must be "unpinned" before server selection for a retry.
        self.selection_criteria = None;
    }
}