Use flex-error to define errors

Cargo.toml

@@ -12,7 +12,7 @@ exclude = [
     "proto-compiler"
 ]
 
-# [patch.crates-io]
+[patch.crates-io]
 # tendermint              = { git = "https://github.com/informalsystems/tendermint-rs", branch = "master" }
 # tendermint-rpc          = { git = "https://github.com/informalsystems/tendermint-rs", branch = "master" }
 # tendermint-proto        = { git = "https://github.com/informalsystems/tendermint-rs", branch = "master" }

modules/Cargo.toml

@@ -16,13 +16,17 @@ description = """
 [features]
 # This feature grants access to development-time mocking libraries, such as `MockContext` or `MockHeader`.
 # Depends on the `testgen` suite for generating Tendermint light blocks.
+default = ["std", "eyre_tracer"]
+std = [
+    "flex-error/std"
+]
+eyre_tracer = ["flex-error/eyre_tracer"]
 mocks = [ "tendermint-testgen", "sha2" ]
 
 [dependencies]
 # Proto definitions for all IBC-related interfaces, e.g., connections or channels.
 ibc-proto = { version = "0.9.0", path = "../proto" }
 ics23 = "0.6.5"
-anomaly = "0.2.0"
 chrono = "0.4.19"
 thiserror = "1.0.26"
 serde_derive = "1.0.104"
@@ -36,6 +40,7 @@ dyn-clonable = "0.9.0"
 regex = "1"
 subtle-encoding = "0.5"
 sha2 = { version = "0.9.3", optional = true }
+flex-error = { version = "0.4.1", default-features = false }
 
 [dependencies.tendermint]
 version = "=0.21.0"

modules/src/application/ics20_fungible_token_transfer/error.rs

@@ -1,44 +1,46 @@
-use anomaly::{BoxError, Context};
-use thiserror::Error;
-
+use crate::ics04_channel::error as channel_error;
+use crate::ics24_host::error::ValidationError;
 use crate::ics24_host::identifier::{ChannelId, PortId};
-
-pub type Error = anomaly::Error<Kind>;
-
-#[derive(Clone, Debug, Error, PartialEq, Eq)]
-pub enum Kind {
-    #[error("unrecognized ICS-20 transfer message type URL {0}")]
-    UnknownMessageTypeUrl(String),
-
-    #[error("error raised by message handler")]
-    HandlerRaisedError,
-
-    #[error("sending sequence number not found for port {0} and channel {1}")]
-    SequenceSendNotFound(PortId, ChannelId),
-
-    #[error("missing channel for port_id {0} and channel_id {1} ")]
-    ChannelNotFound(PortId, ChannelId),
-
-    #[error(
-        "destination channel not found in the counterparty of port_id {0} and channel_id {1} "
-    )]
-    DestinationChannelNotFound(PortId, ChannelId),
-
-    #[error("invalid port identifier")]
-    InvalidPortId(String),
-
-    #[error("invalid channel identifier")]
-    InvalidChannelId(String),
-
-    #[error("invalid packet timeout height value")]
-    InvalidPacketTimeoutHeight(String),
-
-    #[error("invalid packet timeout timestamp value")]
-    InvalidPacketTimeoutTimestamp(u64),
-}
-
-impl Kind {
-    pub fn context(self, source: impl Into<BoxError>) -> Context<Self> {
-        Context::new(self, Some(source.into()))
+use flex_error::define_error;
+
+define_error! {
+    Error {
+        UnknowMessageTypeUrl
+            { url: String }
+            | e | { format_args!("unrecognized ICS-20 transfer message type URL {0}", e.url) },
+
+        Ics04Channel
+            [ channel_error::Error ]
+            |_ | { "Ics04 channel error" },
+
+        SequenceSendNotFound
+            { port_id: PortId, channel_id: ChannelId }
+            | e | { format_args!("sending sequence number not found for port {0} and channel {1}", e.port_id, e.channel_id) },
+
+        ChannelNotFound
+            { port_id: PortId, channel_id: ChannelId }
+            | e | { format_args!("sending sequence number not found for port {0} and channel {1}", e.port_id, e.channel_id) },
+
+        DestinationChannelNotFound
+            { port_id: PortId, channel_id: ChannelId }
+            | e | { format_args!("destination channel not found in the counterparty of port_id {0} and channel_id {1} ", e.port_id, e.channel_id) },
+
+        InvalidPortId
+            { context: String }
+            [ ValidationError ]
+            | _ | { "invalid port identifier" },
+
+        InvalidChannelId
+            { context: String }
+            [ ValidationError ]
+            | _ | { "invalid channel identifier" },
+
+        InvalidPacketTimeoutHeight
+            { context: String }
+            | _ | { "invalid packet timeout height value" },
+
+        InvalidPacketTimeoutTimestamp
+            { timestamp: u64 }
+            | _ | { "invalid packet timeout timestamp value" },
     }
 }

modules/src/application/ics20_fungible_token_transfer/msgs/transfer.rs

@@ -6,7 +6,7 @@ use tendermint_proto::Protobuf;
 
 use ibc_proto::ibc::apps::transfer::v1::MsgTransfer as RawMsgTransfer;
 
-use crate::application::ics20_fungible_token_transfer::error::{Error, Kind};
+use crate::application::ics20_fungible_token_transfer::error::Error;
 use crate::ics02_client::height::Height;
 use crate::ics24_host::identifier::{ChannelId, PortId};
 use crate::signer::Signer;
@@ -54,28 +54,28 @@ impl Msg for MsgTransfer {
 impl Protobuf<RawMsgTransfer> for MsgTransfer {}
 
 impl TryFrom<RawMsgTransfer> for MsgTransfer {
-    type Error = Kind;
+    type Error = Error;
 
     fn try_from(raw_msg: RawMsgTransfer) -> Result<Self, Self::Error> {
         let timeout_timestamp = Timestamp::from_nanoseconds(raw_msg.timeout_timestamp)
-            .map_err(|_| Kind::InvalidPacketTimeoutTimestamp(raw_msg.timeout_timestamp))?;
+            .map_err(|_| Error::invalid_packet_timeout_timestamp(raw_msg.timeout_timestamp))?;
 
         let timeout_height = match raw_msg.timeout_height.clone() {
             None => Height::zero(),
             Some(raw_height) => raw_height.try_into().map_err(|e| {
-                Kind::InvalidPacketTimeoutHeight(format!("invalid timeout height {}", e))
+                Error::invalid_packet_timeout_height(format!("invalid timeout height {}", e))
             })?,
         };
 
         Ok(MsgTransfer {
             source_port: raw_msg
                 .source_port
                 .parse()
-                .map_err(|_| Kind::InvalidPortId(raw_msg.source_port.clone()))?,
+                .map_err(|e| Error::invalid_port_id(raw_msg.source_port.clone(), e))?,
             source_channel: raw_msg
                 .source_channel
                 .parse()
-                .map_err(|_| Kind::InvalidChannelId(raw_msg.source_channel.clone()))?,
+                .map_err(|e| Error::invalid_channel_id(raw_msg.source_channel.clone(), e))?,
             token: raw_msg.token,
             sender: raw_msg.sender.into(),
             receiver: raw_msg.receiver.into(),

modules/src/application/ics20_fungible_token_transfer/relay_application_logic/send_transfer.rs

@@ -1,5 +1,5 @@
 use crate::application::ics20_fungible_token_transfer::context::Ics20Context;
-use crate::application::ics20_fungible_token_transfer::error::{Error, Kind};
+use crate::application::ics20_fungible_token_transfer::error::Error;
 use crate::application::ics20_fungible_token_transfer::msgs::transfer::MsgTransfer;
 use crate::handler::HandlerOutput;
 use crate::ics04_channel::handler::send_packet::send_packet;
@@ -16,22 +16,25 @@ where
     let source_channel_end = ctx
         .channel_end(&(msg.source_port.clone(), msg.source_channel.clone()))
         .ok_or_else(|| {
-            Kind::ChannelNotFound(msg.source_port.clone(), msg.source_channel.clone())
+            Error::channel_not_found(msg.source_port.clone(), msg.source_channel.clone())
         })?;
 
     let destination_port = source_channel_end.counterparty().port_id().clone();
     let destination_channel = source_channel_end
         .counterparty()
         .channel_id()
         .ok_or_else(|| {
-            Kind::DestinationChannelNotFound(msg.source_port.clone(), msg.source_channel.clone())
+            Error::destination_channel_not_found(
+                msg.source_port.clone(),
+                msg.source_channel.clone(),
+            )
         })?;
 
     // get the next sequence
     let sequence = ctx
         .get_next_sequence_send(&(msg.source_port.clone(), msg.source_channel.clone()))
         .ok_or_else(|| {
-            Kind::SequenceSendNotFound(msg.source_port.clone(), msg.source_channel.clone())
+            Error::sequence_send_not_found(msg.source_port.clone(), msg.source_channel.clone())
         })?;
 
     //TODO: Application LOGIC.
@@ -47,8 +50,7 @@ where
         timeout_timestamp: msg.timeout_timestamp,
     };
 
-    let handler_output =
-        send_packet(ctx, packet).map_err(|e| Kind::HandlerRaisedError.context(e))?;
+    let handler_output = send_packet(ctx, packet).map_err(Error::ics04_channel)?;
 
     //TODO:  add event/atributes and writes to the store issued by the application logic for packet sending.
     Ok(handler_output)