mongodb 3.5.1

The official MongoDB driver for Rust
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107

use std::convert::TryInto;

use crate::{
    bson::{Document, RawBsonRef, RawDocumentBuf},
    bson_compat::{cstr, CStr},
    client::SESSIONS_UNSUPPORTED_COMMANDS,
    cmap::{conn::PinnedConnectionHandle, Command, RawCommandResponse, StreamDescription},
    error::{ErrorKind, Result},
    selection_criteria::SelectionCriteria,
};

use super::{ExecutionContext, OperationWithDefaults};

#[derive(Debug, Clone)]
pub(crate) struct RunCommand<'conn> {
    db: String,
    command: RawDocumentBuf,
    selection_criteria: Option<SelectionCriteria>,
    pinned_connection: Option<&'conn PinnedConnectionHandle>,
}

impl<'conn> RunCommand<'conn> {
    pub(crate) fn new(
        db: String,
        command: RawDocumentBuf,
        selection_criteria: Option<SelectionCriteria>,
        pinned_connection: Option<&'conn PinnedConnectionHandle>,
    ) -> Self {
        Self {
            db,
            command,
            selection_criteria,
            pinned_connection,
        }
    }

    fn command_name(&self) -> Option<&CStr> {
        self.command
            .into_iter()
            .next()
            .and_then(|r| r.ok())
            .map(|(k, _)| k)
    }
}

impl OperationWithDefaults 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 CStr = cstr!("$genericRunCommand");

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

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

    fn extract_at_cluster_time(
        &self,
        response: &crate::bson::RawDocument,
    ) -> Result<Option<crate::bson::Timestamp>> {
        if let Some(RawBsonRef::Timestamp(ts)) = response.get("atClusterTime")? {
            Ok(Some(ts))
        } else {
            super::cursor_get_at_cluster_time(response)
        }
    }

    fn handle_response<'a>(
        &'a self,
        response: &'a RawCommandResponse,
        _context: ExecutionContext<'a>,
    ) -> Result<Self::O> {
        Ok(response.raw_body().try_into()?)
    }

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

    fn pinned_connection(&self) -> Option<&PinnedConnectionHandle> {
        self.pinned_connection
    }

    #[cfg(feature = "opentelemetry")]
    type Otel = crate::otel::Witness<Self>;
}

#[cfg(feature = "opentelemetry")]
impl crate::otel::OtelInfoDefaults for RunCommand<'_> {
    fn target(&self) -> crate::otel::OperationTarget<'_> {
        self.db.as_str().into()
    }
}