reth_eth_wire/
capability.rs

1//! All capability related types
2
3use crate::{
4    errors::{P2PHandshakeError, P2PStreamError},
5    p2pstream::MAX_RESERVED_MESSAGE_ID,
6    protocol::{ProtoVersion, Protocol},
7    version::ParseVersionError,
8    Capability, EthMessageID, EthVersion,
9};
10use derive_more::{Deref, DerefMut};
11use std::{
12    borrow::Cow,
13    collections::{BTreeSet, HashMap},
14};
15
16/// This represents a shared capability, its version, and its message id offset.
17///
18/// The [offset](SharedCapability::message_id_offset) is the message ID offset for this shared
19/// capability, determined during the rlpx handshake.
20///
21/// See also [Message-id based multiplexing](https://github.com/ethereum/devp2p/blob/master/rlpx.md#message-id-based-multiplexing)
22#[derive(Debug, Clone, PartialEq, Eq, Hash)]
23pub enum SharedCapability {
24    /// The `eth` capability.
25    Eth {
26        /// (Highest) negotiated version of the eth capability.
27        version: EthVersion,
28        /// The message ID offset for this capability.
29        ///
30        /// This represents the message ID offset for the first message of the eth capability in
31        /// the message id space.
32        offset: u8,
33    },
34    /// Any other unknown capability.
35    UnknownCapability {
36        /// Shared capability.
37        cap: Capability,
38        /// The message ID offset for this capability.
39        ///
40        /// This represents the message ID offset for the first message of the eth capability in
41        /// the message id space.
42        offset: u8,
43        /// The number of messages of this capability. Needed to calculate range of message IDs in
44        /// demuxing.
45        messages: u8,
46    },
47}
48
49impl SharedCapability {
50    /// Creates a new [`SharedCapability`] based on the given name, offset, version (and messages
51    /// if the capability is custom).
52    ///
53    /// Returns an error if the offset is equal or less than [`MAX_RESERVED_MESSAGE_ID`].
54    pub(crate) fn new(
55        name: &str,
56        version: u8,
57        offset: u8,
58        messages: u8,
59    ) -> Result<Self, SharedCapabilityError> {
60        if offset <= MAX_RESERVED_MESSAGE_ID {
61            return Err(SharedCapabilityError::ReservedMessageIdOffset(offset))
62        }
63
64        match name {
65            "eth" => Ok(Self::eth(EthVersion::try_from(version)?, offset)),
66            _ => Ok(Self::UnknownCapability {
67                cap: Capability::new(name.to_string(), version as usize),
68                offset,
69                messages,
70            }),
71        }
72    }
73
74    /// Creates a new [`SharedCapability`] based on the given name, offset, and version.
75    pub(crate) const fn eth(version: EthVersion, offset: u8) -> Self {
76        Self::Eth { version, offset }
77    }
78
79    /// Returns the capability.
80    pub const fn capability(&self) -> Cow<'_, Capability> {
81        match self {
82            Self::Eth { version, .. } => Cow::Owned(Capability::eth(*version)),
83            Self::UnknownCapability { cap, .. } => Cow::Borrowed(cap),
84        }
85    }
86
87    /// Returns the name of the capability.
88    #[inline]
89    pub fn name(&self) -> &str {
90        match self {
91            Self::Eth { .. } => "eth",
92            Self::UnknownCapability { cap, .. } => cap.name.as_ref(),
93        }
94    }
95
96    /// Returns true if the capability is eth.
97    #[inline]
98    pub const fn is_eth(&self) -> bool {
99        matches!(self, Self::Eth { .. })
100    }
101
102    /// Returns the version of the capability.
103    pub const fn version(&self) -> u8 {
104        match self {
105            Self::Eth { version, .. } => *version as u8,
106            Self::UnknownCapability { cap, .. } => cap.version as u8,
107        }
108    }
109
110    /// Returns the eth version if it's the `eth` capability.
111    pub const fn eth_version(&self) -> Option<EthVersion> {
112        match self {
113            Self::Eth { version, .. } => Some(*version),
114            _ => None,
115        }
116    }
117
118    /// Returns the message ID offset of the current capability.
119    ///
120    /// This represents the message ID offset for the first message of the eth capability in the
121    /// message id space.
122    pub const fn message_id_offset(&self) -> u8 {
123        match self {
124            Self::Eth { offset, .. } | Self::UnknownCapability { offset, .. } => *offset,
125        }
126    }
127
128    /// Returns the message ID offset of the current capability relative to the start of the
129    /// reserved message id space: [`MAX_RESERVED_MESSAGE_ID`].
130    pub const fn relative_message_id_offset(&self) -> u8 {
131        self.message_id_offset() - MAX_RESERVED_MESSAGE_ID - 1
132    }
133
134    /// Returns the number of protocol messages supported by this capability.
135    pub const fn num_messages(&self) -> u8 {
136        match self {
137            Self::Eth { version, .. } => EthMessageID::message_count(*version),
138            Self::UnknownCapability { messages, .. } => *messages,
139        }
140    }
141}
142
143/// Non-empty,ordered list of recognized shared capabilities.
144///
145/// Shared capabilities are ordered alphabetically by case sensitive name.
146#[derive(Debug, Clone, Deref, DerefMut, PartialEq, Eq)]
147pub struct SharedCapabilities(Vec<SharedCapability>);
148
149impl SharedCapabilities {
150    /// Merges the local and peer capabilities and returns a new [`SharedCapabilities`] instance.
151    #[inline]
152    pub fn try_new(
153        local_protocols: Vec<Protocol>,
154        peer_capabilities: Vec<Capability>,
155    ) -> Result<Self, P2PStreamError> {
156        shared_capability_offsets(local_protocols, peer_capabilities).map(Self)
157    }
158
159    /// Iterates over the shared capabilities.
160    #[inline]
161    pub fn iter_caps(&self) -> impl Iterator<Item = &SharedCapability> {
162        self.0.iter()
163    }
164
165    /// Returns the eth capability if it is shared.
166    #[inline]
167    pub fn eth(&self) -> Result<&SharedCapability, P2PStreamError> {
168        self.iter_caps().find(|c| c.is_eth()).ok_or(P2PStreamError::CapabilityNotShared)
169    }
170
171    /// Returns the negotiated eth version if it is shared.
172    #[inline]
173    pub fn eth_version(&self) -> Result<EthVersion, P2PStreamError> {
174        self.iter_caps()
175            .find_map(SharedCapability::eth_version)
176            .ok_or(P2PStreamError::CapabilityNotShared)
177    }
178
179    /// Returns `true` if the shared capabilities are exactly `eth` and `snap/2` (EIP-8189), the
180    /// layout handled by the dedicated [`EthSnapStream`](crate::EthSnapStream).
181    #[inline]
182    pub fn is_exact_eth_snap_v2(&self) -> bool {
183        self.len() == 2 && self.ensure_matching_capability(&Capability::snap_2()).is_ok()
184    }
185
186    /// Returns true if the shared capabilities contain the given capability.
187    #[inline]
188    pub fn contains(&self, cap: &Capability) -> bool {
189        self.find(cap).is_some()
190    }
191
192    /// Returns the shared capability for the given capability.
193    #[inline]
194    pub fn find(&self, cap: &Capability) -> Option<&SharedCapability> {
195        self.0.iter().find(|c| c.version() == cap.version as u8 && c.name() == cap.name)
196    }
197
198    /// Converts a capability-local message ID into the relative `RLPx` message ID used by
199    /// [`P2PStream`](crate::P2PStream).
200    ///
201    /// `P2PStream` strips the reserved p2p message ID range before yielding subprotocol messages,
202    /// so the returned ID is relative to the first shared capability, not the absolute wire ID.
203    #[inline]
204    pub fn relative_message_id(&self, cap: &Capability, message_id: u8) -> Option<u8> {
205        let shared = self.find(cap)?;
206        if message_id >= shared.num_messages() {
207            return None
208        }
209
210        shared.relative_message_id_offset().checked_add(message_id)
211    }
212
213    /// Converts a relative `RLPx` message ID back into the message ID local to `cap`.
214    ///
215    /// Returns `None` if `cap` is not shared, if the relative ID belongs to a different
216    /// capability, or if it is outside the capability's negotiated message range.
217    #[inline]
218    pub fn capability_message_id(&self, cap: &Capability, relative_message_id: u8) -> Option<u8> {
219        let shared = self.find(cap)?;
220        let start = shared.relative_message_id_offset();
221        let end = start.checked_add(shared.num_messages())?;
222
223        (start..end).contains(&relative_message_id).then(|| relative_message_id - start)
224    }
225
226    /// Returns the matching shared capability for the given capability offset.
227    ///
228    /// `offset` is the multiplexed message id offset of the capability relative to the reserved
229    /// message id space. In other words, counting starts at [`MAX_RESERVED_MESSAGE_ID`] + 1, which
230    /// corresponds to the first non-reserved message id.
231    ///
232    /// For example: `offset == 0` corresponds to the first shared message across the shared
233    /// capabilities and will return the first shared capability that supports messages.
234    #[inline]
235    pub fn find_by_relative_offset(&self, offset: u8) -> Option<&SharedCapability> {
236        self.find_by_offset(offset.saturating_add(MAX_RESERVED_MESSAGE_ID + 1))
237    }
238
239    /// Returns the matching shared capability for the given capability offset.
240    ///
241    /// `offset` is the multiplexed message id offset of the capability that includes the reserved
242    /// message id space.
243    ///
244    /// This will always return None if `offset` is less than or equal to
245    /// [`MAX_RESERVED_MESSAGE_ID`] because the reserved message id space is not shared.
246    #[inline]
247    pub fn find_by_offset(&self, offset: u8) -> Option<&SharedCapability> {
248        let mut iter = self.0.iter();
249        let mut cap = iter.next()?;
250        if offset < cap.message_id_offset() {
251            // reserved message id space
252            return None
253        }
254
255        for next in iter {
256            if offset < next.message_id_offset() {
257                return Some(cap)
258            }
259            cap = next
260        }
261
262        Some(cap)
263    }
264
265    /// Returns the shared capability for the given capability or an error if it's not compatible.
266    #[inline]
267    pub fn ensure_matching_capability(
268        &self,
269        cap: &Capability,
270    ) -> Result<&SharedCapability, UnsupportedCapabilityError> {
271        self.find(cap).ok_or_else(|| UnsupportedCapabilityError { capability: cap.clone() })
272    }
273
274    /// Returns the number of shared capabilities.
275    #[inline]
276    pub const fn len(&self) -> usize {
277        self.0.len()
278    }
279
280    /// Returns true if there are no shared capabilities.
281    #[inline]
282    pub const fn is_empty(&self) -> bool {
283        self.0.is_empty()
284    }
285}
286
287/// Determines the offsets for each shared capability between the input list of peer
288/// capabilities and the input list of locally supported [Protocol].
289///
290/// Additionally, the `p2p` capability version 5 is supported, but is
291/// expected _not_ to be in neither `local_protocols` or `peer_capabilities`.
292///
293/// **Note**: For `local_protocols` this takes [Protocol] because we need to know the number of
294/// messages per versioned capability. From the remote we only get the plain [Capability].
295#[inline]
296pub fn shared_capability_offsets(
297    local_protocols: Vec<Protocol>,
298    peer_capabilities: Vec<Capability>,
299) -> Result<Vec<SharedCapability>, P2PStreamError> {
300    // find intersection of capabilities
301    let our_capabilities =
302        local_protocols.into_iter().map(Protocol::split).collect::<HashMap<_, _>>();
303
304    // map of capability name to version
305    let mut shared_capabilities: HashMap<_, ProtoVersion> = HashMap::default();
306
307    // The `Ord` implementation for capability names should be equivalent to geth (and every other
308    // client), since geth uses golang's default string comparison, which orders strings
309    // lexicographically.
310    // https://golang.org/pkg/strings/#Compare
311    //
312    // This is important because the capability name is used to determine the message id offset, so
313    // if the sorting is not identical, offsets for connected peers could be inconsistent.
314    // This would cause the peers to send messages with the wrong message id, which is usually a
315    // protocol violation.
316    //
317    // The `Ord` implementation for `str` orders strings lexicographically.
318    let mut shared_capability_names = BTreeSet::new();
319
320    // find highest shared version of each shared capability
321    for peer_capability in peer_capabilities {
322        // if we contain this specific capability both peers share it
323        if let Some(messages) = our_capabilities.get(&peer_capability).copied() {
324            // If multiple versions are shared of the same (equal name) capability, the numerically
325            // highest wins, others are ignored
326            if shared_capabilities
327                .get(&peer_capability.name)
328                .is_none_or(|v| peer_capability.version > v.version)
329            {
330                shared_capabilities.insert(
331                    peer_capability.name.clone(),
332                    ProtoVersion { version: peer_capability.version, messages },
333                );
334                shared_capability_names.insert(peer_capability.name);
335            }
336        }
337    }
338
339    // disconnect if we don't share any capabilities
340    if shared_capabilities.is_empty() {
341        return Err(P2PStreamError::HandshakeError(P2PHandshakeError::NoSharedCapabilities))
342    }
343
344    // order versions based on capability name (alphabetical) and select offsets based on
345    // BASE_OFFSET + prev_total_message
346    let mut shared_with_offsets = Vec::new();
347
348    // Message IDs are assumed to be compact from ID 0x10 onwards (0x00-0x0f is reserved for the
349    // "p2p" capability) and given to each shared (equal-version, equal-name) capability in
350    // alphabetic order.
351    let mut offset = MAX_RESERVED_MESSAGE_ID + 1;
352    for name in shared_capability_names {
353        let proto_version = &shared_capabilities[&name];
354        let shared_capability = SharedCapability::new(
355            &name,
356            proto_version.version as u8,
357            offset,
358            proto_version.messages,
359        )?;
360        offset += shared_capability.num_messages();
361        shared_with_offsets.push(shared_capability);
362    }
363
364    if shared_with_offsets.is_empty() {
365        return Err(P2PStreamError::HandshakeError(P2PHandshakeError::NoSharedCapabilities))
366    }
367
368    Ok(shared_with_offsets)
369}
370
371/// An error that may occur while creating a [`SharedCapability`].
372#[derive(Debug, thiserror::Error)]
373pub enum SharedCapabilityError {
374    /// Unsupported `eth` version.
375    #[error(transparent)]
376    UnsupportedVersion(#[from] ParseVersionError),
377    /// Thrown when the message id for a [`SharedCapability`] overlaps with the reserved p2p
378    /// message id space [`MAX_RESERVED_MESSAGE_ID`].
379    #[error("message id offset `{0}` is reserved")]
380    ReservedMessageIdOffset(u8),
381}
382
383/// An error thrown when capabilities mismatch.
384#[derive(Debug, thiserror::Error)]
385#[error("unsupported capability {capability}")]
386pub struct UnsupportedCapabilityError {
387    capability: Capability,
388}
389
390impl UnsupportedCapabilityError {
391    /// Creates a new error with the given capability
392    pub const fn new(capability: Capability) -> Self {
393        Self { capability }
394    }
395}
396
397#[cfg(test)]
398mod tests {
399    use super::*;
400    use crate::{Capabilities, Capability, SnapVersion};
401    use alloy_primitives::bytes::Bytes;
402    use alloy_rlp::{Decodable, Encodable};
403    use reth_eth_wire_types::RawCapabilityMessage;
404
405    #[test]
406    fn from_eth_68() {
407        let capability = SharedCapability::new("eth", 68, MAX_RESERVED_MESSAGE_ID + 1, 13).unwrap();
408
409        assert_eq!(capability.name(), "eth");
410        assert_eq!(capability.version(), 68);
411        assert_eq!(
412            capability,
413            SharedCapability::Eth {
414                version: EthVersion::Eth68,
415                offset: MAX_RESERVED_MESSAGE_ID + 1
416            }
417        );
418    }
419
420    #[test]
421    fn from_eth_67() {
422        let capability = SharedCapability::new("eth", 67, MAX_RESERVED_MESSAGE_ID + 1, 13).unwrap();
423
424        assert_eq!(capability.name(), "eth");
425        assert_eq!(capability.version(), 67);
426        assert_eq!(
427            capability,
428            SharedCapability::Eth {
429                version: EthVersion::Eth67,
430                offset: MAX_RESERVED_MESSAGE_ID + 1
431            }
432        );
433    }
434
435    #[test]
436    fn from_eth_66() {
437        let capability = SharedCapability::new("eth", 66, MAX_RESERVED_MESSAGE_ID + 1, 15).unwrap();
438
439        assert_eq!(capability.name(), "eth");
440        assert_eq!(capability.version(), 66);
441        assert_eq!(
442            capability,
443            SharedCapability::Eth {
444                version: EthVersion::Eth66,
445                offset: MAX_RESERVED_MESSAGE_ID + 1
446            }
447        );
448    }
449
450    #[test]
451    fn capabilities_supports_eth() {
452        let capabilities: Capabilities = vec![
453            Capability::new_static("eth", 66),
454            Capability::new_static("eth", 67),
455            Capability::new_static("eth", 68),
456            Capability::new_static("eth", 69),
457            Capability::new_static("eth", 70),
458        ]
459        .into();
460
461        assert!(capabilities.supports_eth());
462        assert!(capabilities.supports_eth_v66());
463        assert!(capabilities.supports_eth_v67());
464        assert!(capabilities.supports_eth_v68());
465        assert!(capabilities.supports_eth_v69());
466        assert!(capabilities.supports_eth_v70());
467    }
468
469    #[test]
470    fn test_peer_capability_version_zero() {
471        let cap = Capability::new_static("TestName", 0);
472        let local_capabilities: Vec<Protocol> =
473            vec![Protocol::new(cap.clone(), 0), EthVersion::Eth67.into(), EthVersion::Eth68.into()];
474        let peer_capabilities = vec![cap.clone()];
475
476        let shared = shared_capability_offsets(local_capabilities, peer_capabilities).unwrap();
477        assert_eq!(shared.len(), 1);
478        assert_eq!(shared[0], SharedCapability::UnknownCapability { cap, offset: 16, messages: 0 })
479    }
480
481    #[test]
482    fn test_peer_lower_capability_version() {
483        let local_capabilities: Vec<Protocol> =
484            vec![EthVersion::Eth66.into(), EthVersion::Eth67.into(), EthVersion::Eth68.into()];
485        let peer_capabilities: Vec<Capability> = vec![EthVersion::Eth66.into()];
486
487        let shared_capability =
488            shared_capability_offsets(local_capabilities, peer_capabilities).unwrap()[0].clone();
489
490        assert_eq!(
491            shared_capability,
492            SharedCapability::Eth {
493                version: EthVersion::Eth66,
494                offset: MAX_RESERVED_MESSAGE_ID + 1
495            }
496        )
497    }
498
499    #[test]
500    fn test_peer_capability_version_too_low() {
501        let local: Vec<Protocol> = vec![EthVersion::Eth67.into()];
502        let peer_capabilities: Vec<Capability> = vec![EthVersion::Eth66.into()];
503
504        let shared_capability = shared_capability_offsets(local, peer_capabilities);
505
506        assert!(matches!(
507            shared_capability,
508            Err(P2PStreamError::HandshakeError(P2PHandshakeError::NoSharedCapabilities))
509        ))
510    }
511
512    #[test]
513    fn test_peer_capability_version_too_high() {
514        let local_capabilities = vec![EthVersion::Eth66.into()];
515        let peer_capabilities = vec![EthVersion::Eth67.into()];
516
517        let shared_capability = shared_capability_offsets(local_capabilities, peer_capabilities);
518
519        assert!(matches!(
520            shared_capability,
521            Err(P2PStreamError::HandshakeError(P2PHandshakeError::NoSharedCapabilities))
522        ))
523    }
524
525    #[test]
526    fn test_find_by_offset() {
527        let local_capabilities = vec![EthVersion::Eth66.into()];
528        let peer_capabilities = vec![EthVersion::Eth66.into()];
529
530        let shared = SharedCapabilities::try_new(local_capabilities, peer_capabilities).unwrap();
531
532        let shared_eth = shared.find_by_relative_offset(0).unwrap();
533        assert_eq!(shared_eth.name(), "eth");
534
535        let shared_eth = shared.find_by_offset(MAX_RESERVED_MESSAGE_ID + 1).unwrap();
536        assert_eq!(shared_eth.name(), "eth");
537
538        // reserved message id space
539        assert!(shared.find_by_offset(MAX_RESERVED_MESSAGE_ID).is_none());
540    }
541
542    #[test]
543    fn test_find_by_offset_many() {
544        let cap = Capability::new_static("aaa", 1);
545        let proto = Protocol::new(cap.clone(), 5);
546        let local_capabilities = vec![proto.clone(), EthVersion::Eth66.into()];
547        let peer_capabilities = vec![cap, EthVersion::Eth66.into()];
548
549        let shared = SharedCapabilities::try_new(local_capabilities, peer_capabilities).unwrap();
550
551        let shared_eth = shared.find_by_relative_offset(0).unwrap();
552        assert_eq!(shared_eth.name(), proto.cap.name);
553
554        let shared_eth = shared.find_by_offset(MAX_RESERVED_MESSAGE_ID + 1).unwrap();
555        assert_eq!(shared_eth.name(), proto.cap.name);
556
557        // the 5th shared message (0,1,2,3,4) is the last message of the aaa capability
558        let shared_eth = shared.find_by_relative_offset(4).unwrap();
559        assert_eq!(shared_eth.name(), proto.cap.name);
560        let shared_eth = shared.find_by_offset(MAX_RESERVED_MESSAGE_ID + 5).unwrap();
561        assert_eq!(shared_eth.name(), proto.cap.name);
562
563        // the 6th shared message is the first message of the eth capability
564        let shared_eth = shared.find_by_relative_offset(1 + proto.messages()).unwrap();
565        assert_eq!(shared_eth.name(), "eth");
566    }
567
568    #[test]
569    fn relative_message_id_accounts_for_intermediate_capabilities() {
570        let intermediate_cap = Capability::new_static("foo", 1);
571        let intermediate = Protocol::new(intermediate_cap.clone(), 3);
572        let snap = Capability::snap(SnapVersion::V2);
573        let eth = Capability::eth(EthVersion::Eth69);
574        let local_capabilities =
575            vec![EthVersion::Eth69.into(), intermediate, Protocol::snap(SnapVersion::V2)];
576        let peer_capabilities = vec![eth, intermediate_cap, snap.clone()];
577
578        let shared = SharedCapabilities::try_new(local_capabilities, peer_capabilities).unwrap();
579        let snap_id = shared.relative_message_id(&snap, 2).unwrap();
580
581        assert_eq!(snap_id, EthMessageID::message_count(EthVersion::Eth69) + 3 + 2);
582        assert_eq!(shared.capability_message_id(&snap, snap_id), Some(2));
583    }
584
585    #[test]
586    fn capability_message_id_rejects_other_capability_range() {
587        let intermediate_cap = Capability::new_static("foo", 1);
588        let intermediate = Protocol::new(intermediate_cap.clone(), 3);
589        let snap = Capability::snap(SnapVersion::V2);
590        let local_capabilities =
591            vec![EthVersion::Eth69.into(), intermediate, Protocol::snap(SnapVersion::V2)];
592        let peer_capabilities =
593            vec![Capability::eth(EthVersion::Eth69), intermediate_cap.clone(), snap.clone()];
594
595        let shared = SharedCapabilities::try_new(local_capabilities, peer_capabilities).unwrap();
596        let intermediate_id = shared.relative_message_id(&intermediate_cap, 1).unwrap();
597
598        assert_eq!(shared.capability_message_id(&snap, intermediate_id), None);
599        assert_eq!(shared.relative_message_id(&snap, SnapVersion::V2.message_count()), None);
600    }
601
602    #[test]
603    fn test_raw_capability_rlp() {
604        let msg = RawCapabilityMessage { id: 1, payload: Bytes::from(vec![0x01, 0x02, 0x03]) };
605
606        // Encode the message into bytes
607        let mut encoded = Vec::new();
608        msg.encode(&mut encoded);
609
610        // Decode the bytes back into RawCapabilityMessage
611        let decoded = RawCapabilityMessage::decode(&mut &encoded[..]).unwrap();
612
613        // Verify that the decoded message matches the original
614        assert_eq!(msg, decoded);
615    }
616
617    #[test]
618    fn is_exact_eth_snap_v2_accepts_eth_and_snap() {
619        let shared = SharedCapabilities::try_new(
620            vec![EthVersion::Eth68.into(), Protocol::snap_2()],
621            vec![EthVersion::Eth68.into(), Capability::snap_2()],
622        )
623        .unwrap();
624        assert!(shared.is_exact_eth_snap_v2());
625    }
626
627    #[test]
628    fn is_exact_eth_snap_v2_rejects_eth_only() {
629        let shared = SharedCapabilities::try_new(
630            vec![EthVersion::Eth68.into()],
631            vec![EthVersion::Eth68.into()],
632        )
633        .unwrap();
634        assert!(!shared.is_exact_eth_snap_v2());
635    }
636
637    #[test]
638    fn is_exact_eth_snap_v2_rejects_eth_without_snap() {
639        // eth + a non-snap capability is not the dedicated layout.
640        let cap = Capability::new_static("les", 1);
641        let shared = SharedCapabilities::try_new(
642            vec![EthVersion::Eth68.into(), Protocol::new(cap.clone(), 5)],
643            vec![EthVersion::Eth68.into(), cap],
644        )
645        .unwrap();
646        assert!(!shared.is_exact_eth_snap_v2());
647    }
648
649    #[test]
650    fn is_exact_eth_snap_v2_rejects_eth_snap_plus_extra() {
651        // eth + snap/2 + another capability belongs on the general satellite multiplexer.
652        let cap = Capability::new_static("les", 1);
653        let shared = SharedCapabilities::try_new(
654            vec![EthVersion::Eth68.into(), Protocol::snap_2(), Protocol::new(cap.clone(), 5)],
655            vec![EthVersion::Eth68.into(), Capability::snap_2(), cap],
656        )
657        .unwrap();
658        assert!(!shared.is_exact_eth_snap_v2());
659    }
660}
reth_eth_wire/capability.rs

reth_eth_wire/
capability.rs
