pub struct IsolationToken(/* private fields */);
Expand description

A token used to isolate unrelated streams on different circuits.

When two streams are associated with different isolation tokens, they can never share the same circuit.

Tokens created with IsolationToken::new are all different from one another, and different from tokens created with IsolationToken::no_isolation. However, tokens created with IsolationToken::no_isolation are all equal to one another.

§Examples

Creating distinct isolation tokens:

let token_1 = IsolationToken::new();
let token_2 = IsolationToken::new();

assert_ne!(token_1, token_2);

// Demonstrating the behaviour of no_isolation() tokens:
assert_ne!(token_1, IsolationToken::no_isolation());
assert_eq!(IsolationToken::no_isolation(), IsolationToken::no_isolation());

Using an isolation token to route streams differently over the Tor network:

use arti_client::StreamPrefs;

let token_1 = IsolationToken::new();
let token_2 = IsolationToken::new();

let mut prefs_1 = StreamPrefs::new();
prefs_1.set_isolation(token_1);

let mut prefs_2 = StreamPrefs::new();
prefs_2.set_isolation(token_2);

// These two connections will come from different source IP addresses.
tor_client.connect(("example.com", 80), Some(prefs_1)).await?;
tor_client.connect(("example.com", 80), Some(prefs_2)).await?;

Implementations§

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impl IsolationToken

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pub fn new() -> IsolationToken

Create a new IsolationToken, unequal to any other token this function has created.

§Panics

Panics if we have already allocated 2^64 isolation tokens: in that case, we have exhausted the space of possible tokens, and it is no longer possible to ensure isolation.

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pub fn no_isolation() -> IsolationToken

Create a new IsolationToken equal to every other token created with this function, but different from all tokens created with new.

This can be used when no isolation is wanted for some streams.

Trait Implementations§

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impl Clone for IsolationToken

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fn clone(&self) -> IsolationToken

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for IsolationToken

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

Formats the value using the given formatter. Read more
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impl IsolationHelper for IsolationToken

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fn compatible_same_type(&self, other: &IsolationToken) -> bool

Returns whether self and other are compatible. Read more
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fn join_same_type(&self, other: &IsolationToken) -> Option<IsolationToken>

Join self and other into the intersection of what they allows. Read more
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impl Ord for IsolationToken

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fn cmp(&self, other: &IsolationToken) -> Ordering

This method returns an Ordering between self and other. Read more
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fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more
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fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more
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fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized + PartialOrd,

Restrict a value to a certain interval. Read more
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impl PartialEq for IsolationToken

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

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl PartialOrd for IsolationToken

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fn partial_cmp(&self, other: &IsolationToken) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl Copy for IsolationToken

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impl Eq for IsolationToken

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impl StructuralPartialEq for IsolationToken

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impl<T> Any for T
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Gets the TypeId of self. Read more
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fn compare(&self, key: &K) -> Ordering

Compare self to key and return their ordering.
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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> Isolation for T
where T: IsolationHelper + Clone + Debug + Send + Sync + 'static,

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fn compatible(&self, other: &(dyn Isolation + 'static)) -> bool

Return true if this Isolation is compatible with another. Read more
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fn join(&self, other: &(dyn Isolation + 'static)) -> Option<Box<dyn Isolation>>

Join two Isolation into the intersection of what each allows. Read more
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