mongodb 1.2.1

The official MongoDB driver for Rust
Documentation 
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#[cfg(test)]
mod test;

use super::Operation;
use crate::{
    bson::Document,
    client::SESSIONS_UNSUPPORTED_COMMANDS,
    cmap::{Command, CommandResponse, StreamDescription},
    error::{ErrorKind, Result},
    options::WriteConcern,
    selection_criteria::SelectionCriteria,
};

#[derive(Debug)]
pub(crate) struct RunCommand {
    db: String,
    command: Document,
    selection_criteria: Option<SelectionCriteria>,
    write_concern: Option<WriteConcern>,
}

impl RunCommand {
    pub(crate) fn new(
        db: String,
        command: Document,
        selection_criteria: Option<SelectionCriteria>,
    ) -> Result<Self> {
        let write_concern = command
            .get("writeConcern")
            .map(|doc| bson::from_bson::<WriteConcern>(doc.clone()))
            .transpose()?;

        Ok(Self {
            db,
            command,
            selection_criteria,
            write_concern,
        })
    }

    fn command_name(&self) -> Option<&str> {
        self.command.keys().next().map(String::as_str)
    }
}

impl Operation for RunCommand {
    type O = Document;

    // Since we can't actually specify a string statically here, we just put a descriptive string
    // that should fail loudly if accidentally passed to the server.
    const NAME: &'static str = "$genericRunCommand";

    fn build(&self, _description: &StreamDescription) -> Result<Command> {
        let command_name = self
            .command_name()
            .ok_or_else(|| ErrorKind::ArgumentError {
                message: "an empty document cannot be passed to a run_command operation".into(),
            })?;

        Ok(Command::new(
            command_name.to_string(),
            self.db.clone(),
            self.command.clone(),
        ))
    }

    fn handle_response(&self, response: CommandResponse) -> Result<Self::O> {
        Ok(response.raw_response)
    }

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

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

    fn supports_sessions(&self) -> bool {
        self.command_name()
            .map(|command_name| {
                !SESSIONS_UNSUPPORTED_COMMANDS.contains(command_name.to_lowercase().as_str())
            })
            .unwrap_or(false)
    }
}