Add helpers to retrieve transactions and check their signatures from the chain

CHANGELOG.md

@@ -1,5 +1,7 @@
 ## Unreleased changes
 
+- Add a `From<&AccountInfo>` instance for `AccountAccessStructure` to ease verification of signatures using `GetAccountInfo` response.
+- Add a `get_finalized_block_item` method to the `Client` to retrieve a finalized block item from the node.
 - Remove the V1 API.
 - Add `Display` implementation to `BlockIdentifier`.
 - Add `Display` and `FromStr` implementations for `AccountIdentifier`.

src/types/mod.rs

@@ -21,7 +21,7 @@ use concordium_base::{
         Buffer, Deserial, Get, ParseResult, ReadBytesExt, SerdeDeserialize, SerdeSerialize, Serial,
         Versioned,
     },
-    contracts_common::Duration,
+    contracts_common::{Duration, EntrypointName, Parameter},
     encrypted_transfers,
     encrypted_transfers::types::{
         AggregatedDecryptedAmount, EncryptedAmountTransferData, SecToPubAmountTransferData,
@@ -329,6 +329,30 @@ pub struct AccountInfo {
     pub account_address:          AccountAddress,
 }
 
+impl From<&AccountInfo> for AccountAccessStructure {
+    fn from(value: &AccountInfo) -> Self {
+        Self {
+            keys:      value
+                .account_credentials
+                .iter()
+                .map(|(idx, v)| {
+                    let key = match v.value {
+                        crate::id::types::AccountCredentialWithoutProofs::Initial { ref icdv } => {
+                            icdv.cred_account.clone()
+                        }
+                        crate::id::types::AccountCredentialWithoutProofs::Normal {
+                            ref cdv,
+                            ..
+                        } => cdv.cred_key_info.clone(),
+                    };
+                    (*idx, key)
+                })
+                .collect(),
+            threshold: value.account_threshold,
+        }
+    }
+}
+
 #[derive(SerdeSerialize, SerdeDeserialize, Debug, PartialEq)]
 #[serde(rename_all = "camelCase")]
 /// The state of consensus parameters, and allowed participants (i.e., bakers).
@@ -1246,6 +1270,36 @@ pub enum ExecutionTree {
     V1(ExecutionTreeV1),
 }
 
+impl ExecutionTree {
+    /// Return the name of the top-level entrypoint that was invoked.
+    pub fn entrypoint(&self) -> EntrypointName {
+        match self {
+            ExecutionTree::V0(v0) => v0
+                .top_level
+                .receive_name
+                .as_receive_name()
+                .entrypoint_name(),
+            ExecutionTree::V1(v1) => v1.receive_name.as_receive_name().entrypoint_name(),
+        }
+    }
+
+    /// Return the name of the top-level contract that was invoked.
+    pub fn address(&self) -> ContractAddress {
+        match self {
+            ExecutionTree::V0(v0) => v0.top_level.address,
+            ExecutionTree::V1(v1) => v1.address,
+        }
+    }
+
+    /// Return parameter to the top-level contract call.
+    pub fn parameter(&self) -> Parameter {
+        match self {
+            ExecutionTree::V0(v0) => v0.top_level.message.as_parameter(),
+            ExecutionTree::V1(v1) => v1.message.as_parameter(),
+        }
+    }
+}
+
 /// Convert the trace elements into an [`ExecutionTree`].
 /// This will fail if the list was not generated correctly, but if the list of
 /// trace elements is coming from the node it will always be in the correct

src/v2/mod.rs

@@ -12,8 +12,8 @@ use crate::{
             ContractContext, InstanceInfo, InvokeContractResult, ModuleReference, WasmModule,
         },
         transactions::{self, InitContractPayload, UpdateContractPayload, UpdateInstruction},
-        AbsoluteBlockHeight, AccountInfo, CredentialRegistrationID, Energy, Memo, Nonce,
-        RegisteredData, SpecialTransactionOutcome, TransactionStatus, UpdateSequenceNumber,
+        AbsoluteBlockHeight, AccountInfo, BlockItemSummary, CredentialRegistrationID, Energy, Memo,
+        Nonce, RegisteredData, SpecialTransactionOutcome, TransactionStatus, UpdateSequenceNumber,
     },
 };
 use concordium_base::{
@@ -39,7 +39,7 @@ use concordium_base::{
     },
 };
 pub use endpoints::{QueryError, QueryResult, RPCError, RPCResult};
-use futures::{Stream, StreamExt};
+use futures::{Stream, StreamExt, TryStreamExt};
 pub use http::uri::Scheme;
 use num::{BigUint, ToPrimitive};
 use std::{collections::HashMap, num::ParseIntError, str::FromStr};
@@ -2104,6 +2104,35 @@ impl Client {
         })
     }
 
+    /// Get the specific **block item** if it is finalized.
+    /// If the transaction does not exist in a finalized block
+    /// [`QueryError::NotFound`] is returned.
+    ///
+    /// **Note that this is not an efficient method** since the node API does
+    /// not allow for retrieving just the specific block item, but rather
+    /// requires retrieving the full block. Use it for testing and debugging
+    /// only.
+    ///
+    /// The return value is a triple of the [`BlockItem`], the hash of the block
+    /// in which it is finalized, and the outcome in the form of
+    /// [`BlockItemSummary`].
+    pub async fn get_finalized_block_item(
+        &mut self,
+        th: TransactionHash,
+    ) -> endpoints::QueryResult<(BlockItem<EncodedPayload>, BlockHash, BlockItemSummary)> {
+        let status = self.get_block_item_status(&th).await?;
+        let Some((bh, status)) = status.is_finalized() else {
+            return Err(QueryError::NotFound);
+        };
+        let mut response = self.get_block_items(bh).await?.response;
+        while let Some(tx) = response.try_next().await? {
+            if tx.hash() == th {
+                return Ok((tx, *bh, status.clone()));
+            }
+        }
+        Err(endpoints::QueryError::NotFound)
+    }
+
     /// Shut down the node.
     /// Return a GRPC error if the shutdown failed.
     pub async fn shutdown(&mut self) -> endpoints::RPCResult<()> {