Struct TxOptions 

#[non_exhaustive]
pub struct TxOptions {
    pub read_only: bool,
    pub isolation: Option<IsolationLevel>,
    pub run_pre_request: bool,
}

How AppState::begin_as_with begins a transaction.

#[non_exhaustive], so a knob can be added in a minor release: start from the default and change what should differ.

use postrust_core::IsolationLevel;
use postrust_server::TxOptions;

let options = TxOptions::default()
    .read_only(true)
    .isolation(IsolationLevel::RepeatableRead);
assert!(options.read_only && options.run_pre_request);

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

read_only: bool

Whether the transaction is read-only, which PostgreSQL enforces for everything the transaction reaches – a volatile function, a trigger. A write is refused with 25006, answered 405 as REST answers it. Off by default.

isolation: Option<IsolationLevel>

The isolation level, over the role’s (role_settings) and the server’s (PGRST_DB_TX_ISOLATION). None, the default, leaves the choice to them, as REST does.

run_pre_request: bool

Whether to call db_pre_request, where one is configured. On by default, as it is for every REST request: it is commonly where a deployment refuses a caller, and a route that skips it skips that.

Implementations

impl TxOptions

pub fn read_only(self, read_only: bool) -> Self

With read_only set. See TxOptions::read_only.

pub fn isolation(self, isolation: IsolationLevel) -> Self

At isolation, whatever the configuration says.

pub fn run_pre_request(self, run_pre_request: bool) -> Self

With run_pre_request set.

Trait Implementations

impl Clone for TxOptions

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TxOptions

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

Formats the value using the given formatter.

impl Default for TxOptions

fn default() -> Self

Returns the “default value” for a type.

impl Eq for TxOptions

impl PartialEq for TxOptions

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for TxOptions