Replace usage of boxed dyn errors with new error::Unexpected

src/domain/checker.rs

@@ -1,9 +1,9 @@
-use std::error::Error;
 use std::net;
 use std::str::FromStr;
 use std::sync;
 
-use crate::domain;
+use crate::error::MapUnexpected;
+use crate::{domain, error};
 
 use trust_dns_client::client::{AsyncClient, ClientHandle};
 use trust_dns_client::rr::{DNSClass, Name, RData, RecordType};
@@ -15,7 +15,7 @@ pub enum NewDNSCheckerError {
     InvalidResolverAddress,
 
     #[error(transparent)]
-    Unexpected(Box<dyn Error>),
+    Unexpected(#[from] error::Unexpected),
 }
 
 #[derive(thiserror::Error, Debug)]
@@ -27,7 +27,7 @@ pub enum CheckDomainError {
     ChallengeTokenNotSet,
 
     #[error(transparent)]
-    Unexpected(Box<dyn Error>),
+    Unexpected(#[from] error::Unexpected),
 }
 
 pub struct DNSChecker {
@@ -50,7 +50,7 @@ pub fn new(
 
     let (client, bg) = tokio_runtime
         .block_on(async { AsyncClient::connect(stream).await })
-        .map_err(|e| NewDNSCheckerError::Unexpected(Box::from(e)))?;
+        .map_unexpected()?;
 
     tokio_runtime.spawn(bg);
 
@@ -68,18 +68,15 @@ impl DNSChecker {
     ) -> Result<(), CheckDomainError> {
         let domain = &domain.inner;
 
-        // check that the AAAA is installed correctly on the domain
+        // check that the A is installed correctly on the domain
         {
-            let response = match self
+            let response = self
                 .client
                 .lock()
                 .await
                 .query(domain.clone(), DNSClass::IN, RecordType::A)
                 .await
-            {
+                .map_unexpected()?;
-                Ok(res) => res,
-                Err(e) => return Err(CheckDomainError::Unexpected(Box::from(e))),
-            };
 
             let records = response.answers();
 
@@ -98,20 +95,17 @@ impl DNSChecker {
         // check that the TXT record with the challenge token is correctly installed on the domain
         {
             let domain = Name::from_str("_domiply_challenge")
-                .map_err(|e| CheckDomainError::Unexpected(Box::from(e)))?
+                .map_unexpected()?
                 .append_domain(domain)
-                .map_err(|e| CheckDomainError::Unexpected(Box::from(e)))?;
+                .map_unexpected()?;
 
-            let response = match self
+            let response = self
                 .client
                 .lock()
                 .await
                 .query(domain, DNSClass::IN, RecordType::TXT)
                 .await
-            {
+                .map_unexpected()?;
-                Ok(res) => res,
-                Err(e) => return Err(CheckDomainError::Unexpected(Box::from(e))),
-            };
 
             let records = response.answers();
 

src/domain/config.rs

@@ -1,9 +1,8 @@
-use std::error::Error;
 use std::path::{Path, PathBuf};
 use std::{fs, io, sync};
 
-use crate::domain;
+use crate::error::{MapUnexpected, ToUnexpected};
-use crate::origin::Descr;
+use crate::{domain, error, origin};
 
 use hex::ToHex;
 use serde::{Deserialize, Serialize};
@@ -12,13 +11,13 @@ use sha2::{Digest, Sha256};
 #[derive(Debug, PartialEq, Eq, Clone, Serialize, Deserialize)]
 /// Values which the owner of a domain can configure when they install a domain.
 pub struct Config {
-    pub origin_descr: Descr,
+    pub origin_descr: origin::Descr,
 }
 
 impl Config {
-    pub fn hash(&self) -> Result<String, Box<dyn Error>> {
+    pub fn hash(&self) -> Result<String, error::Unexpected> {
         let mut h = Sha256::new();
-        serde_json::to_writer(&mut h, self)?;
+        serde_json::to_writer(&mut h, self).map_unexpected()?;
         Ok(h.finalize().encode_hex::<String>())
     }
 }
@@ -29,13 +28,13 @@ pub enum GetError {
     NotFound,
 
     #[error(transparent)]
-    Unexpected(Box<dyn Error>),
+    Unexpected(#[from] error::Unexpected),
 }
 
 #[derive(thiserror::Error, Debug)]
 pub enum SetError {
     #[error(transparent)]
-    Unexpected(Box<dyn Error>),
+    Unexpected(#[from] error::Unexpected),
 }
 
 #[mockall::automock]
@@ -74,21 +73,19 @@ impl Store for sync::Arc<FSStore> {
         let config_file =
             fs::File::open(self.config_file_path(domain)).map_err(|e| match e.kind() {
                 io::ErrorKind::NotFound => GetError::NotFound,
-                _ => GetError::Unexpected(Box::from(e)),
+                _ => e.to_unexpected().into(),
             })?;
 
-        serde_json::from_reader(config_file).map_err(|e| GetError::Unexpected(Box::from(e)))
+        let config = serde_json::from_reader(config_file).map_unexpected()?;
+        Ok(config)
     }
 
     fn set(&self, domain: &domain::Name, config: &Config) -> Result<(), SetError> {
-        fs::create_dir_all(self.config_dir_path(domain))
+        fs::create_dir_all(self.config_dir_path(domain)).map_unexpected()?;
-            .map_err(|e| SetError::Unexpected(Box::from(e)))?;
 
-        let config_file = fs::File::create(self.config_file_path(domain))
+        let config_file = fs::File::create(self.config_file_path(domain)).map_unexpected()?;
-            .map_err(|e| SetError::Unexpected(Box::from(e)))?;
 
-        serde_json::to_writer(config_file, config)
+        serde_json::to_writer(config_file, config).map_unexpected()?;
-            .map_err(|e| SetError::Unexpected(Box::from(e)))?;
 
         Ok(())
     }

src/domain/manager.rs

@@ -1,7 +1,7 @@
 use crate::domain::{self, checker, config};
-use crate::origin;
+use crate::error::{MapUnexpected, ToUnexpected};
+use crate::{error, origin};
 
-use std::error::Error;
 use std::future;
 use std::{pin, sync};
 
@@ -11,7 +11,7 @@ pub enum GetConfigError {
     NotFound,
 
     #[error(transparent)]
-    Unexpected(Box<dyn Error>),
+    Unexpected(#[from] error::Unexpected),
 }
 
 impl From<config::GetError> for GetConfigError {
@@ -29,7 +29,7 @@ pub enum GetOriginError {
     NotFound,
 
     #[error(transparent)]
-    Unexpected(Box<dyn Error>),
+    Unexpected(#[from] error::Unexpected),
 }
 
 impl From<config::GetError> for GetOriginError {
@@ -50,7 +50,7 @@ pub enum SyncError {
     AlreadyInProgress,
 
     #[error(transparent)]
-    Unexpected(Box<dyn Error>),
+    Unexpected(#[from] error::Unexpected),
 }
 
 impl From<config::GetError> for SyncError {
@@ -80,7 +80,7 @@ pub enum SyncWithConfigError {
     ChallengeTokenNotSet,
 
     #[error(transparent)]
-    Unexpected(Box<dyn Error>),
+    Unexpected(#[from] error::Unexpected),
 }
 
 impl From<origin::store::SyncError> for SyncWithConfigError {
@@ -198,7 +198,7 @@ where
             .origin_store
             .get(config.origin_descr)
             // if there's a config there should be an origin, any error here is unexpected
-            .map_err(|e| GetOriginError::Unexpected(Box::from(e)))?;
+            .map_unexpected()?;
         Ok(origin)
     }
 
@@ -208,7 +208,7 @@ where
             .sync(config.origin_descr, origin::store::Limits {})
             .map_err(|e| match e {
                 origin::store::SyncError::AlreadyInProgress => SyncError::AlreadyInProgress,
-                _ => SyncError::Unexpected(Box::from(e)),
+                _ => e.to_unexpected().into(),
             })?;
         Ok(())
     }
@@ -219,9 +219,7 @@ where
         config: config::Config,
     ) -> Self::SyncWithConfigFuture<'_> {
         Box::pin(async move {
-            let config_hash = config
+            let config_hash = config.hash().map_unexpected()?;
-                .hash()
-                .map_err(|e| SyncWithConfigError::Unexpected(e))?;
 
             self.domain_checker
                 .check_domain(&domain, &config_hash)

src/error.rs

@@ -0,0 +1,50 @@
+use std::error;
+use std::fmt;
+use std::fmt::Write;
+
+#[derive(Debug, Clone)]
+pub struct Unexpected(String);
+
+impl fmt::Display for Unexpected {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "Unexpected error occurred: {}", self.0)
+    }
+}
+
+impl error::Error for Unexpected {}
+
+impl From<&str> for Unexpected {
+    fn from(s: &str) -> Self {
+        Unexpected(s.to_string())
+    }
+}
+
+pub trait ToUnexpected {
+    fn to_unexpected(&self) -> Unexpected;
+}
+
+impl<E: error::Error> ToUnexpected for E {
+    fn to_unexpected(&self) -> Unexpected {
+        let mut w = String::new();
+        write!(w, "{}", self.to_string()).expect("underlying error formatted correctly");
+
+        if let Some(src) = self.source() {
+            write!(w, " [{src}]").expect("underyling source formatted correctly");
+        }
+
+        Unexpected(w.to_string())
+    }
+}
+
+pub trait MapUnexpected<T> {
+    fn map_unexpected(self) -> Result<T, Unexpected>;
+}
+
+impl<T, E: ToUnexpected> MapUnexpected<T> for Result<T, E> {
+    fn map_unexpected(self) -> Result<T, Unexpected> {
+        match self {
+            Ok(t) => Ok(t),
+            Err(err) => Err(err.to_unexpected()),
+        }
+    }
+}

src/lib.rs

@@ -1,3 +1,4 @@
 pub mod domain;
+pub mod error;
 pub mod origin;
 pub mod service;

src/origin.rs

@@ -1,4 +1,4 @@
-use std::error::Error;
+use crate::error;
 
 mod descr;
 pub use self::descr::Descr;
@@ -10,7 +10,7 @@ pub enum ReadFileIntoError {
     FileNotFound,
 
     #[error(transparent)]
-    Unexpected(Box<dyn Error>),
+    Unexpected(#[from] error::Unexpected),
 }
 
 #[mockall::automock]

src/origin/store.rs

@@ -1,5 +1,4 @@
-use crate::origin;
+use crate::{error, origin};
-use std::error::Error;
 
 pub mod git;
 
@@ -20,7 +19,7 @@ pub enum SyncError {
     AlreadyInProgress,
 
     #[error(transparent)]
-    Unexpected(Box<dyn Error>),
+    Unexpected(#[from] error::Unexpected),
 }
 
 #[derive(thiserror::Error, Debug)]
@@ -29,13 +28,13 @@ pub enum GetError {
     NotFound,
 
     #[error(transparent)]
-    Unexpected(Box<dyn Error>),
+    Unexpected(#[from] error::Unexpected),
 }
 
 #[derive(thiserror::Error, Debug)]
 pub enum AllDescrsError {
     #[error(transparent)]
-    Unexpected(Box<dyn Error>),
+    Unexpected(#[from] error::Unexpected),
 }
 
 /// Used in the return from all_descrs from Store.

src/origin/store/git.rs

@@ -1,7 +1,7 @@
-use crate::origin;
+use crate::error::{MapUnexpected, ToUnexpected};
 use crate::origin::store;
+use crate::{error, origin};
 
-use std::error::Error;
 use std::path::{Path, PathBuf};
 use std::{collections, fs, io, sync};
 
@@ -28,17 +28,16 @@ impl origin::Origin for sync::Arc<Origin> {
 
         let file_object = repo
             .find_object(self.tree_object_id)
-            .map_err(|e| origin::ReadFileIntoError::Unexpected(Box::from(e)))?
+            .map_unexpected()?
             .peel_to_tree()
-            .map_err(|e| origin::ReadFileIntoError::Unexpected(Box::from(e)))?
+            .map_unexpected()?
             .lookup_entry_by_path(clean_path)
-            .map_err(|e| origin::ReadFileIntoError::Unexpected(Box::from(e)))?
+            .map_unexpected()?
             .ok_or(origin::ReadFileIntoError::FileNotFound)?
             .object()
-            .map_err(|e| origin::ReadFileIntoError::Unexpected(Box::from(e)))?;
+            .map_unexpected()?;
 
-        into.write_all(file_object.data.as_ref())
+        into.write_all(file_object.data.as_ref()).map_unexpected()?;
-            .map_err(|e| origin::ReadFileIntoError::Unexpected(Box::from(e)))?;
 
         Ok(())
     }
@@ -50,7 +49,7 @@ enum GetOriginError {
     InvalidBranchName,
 
     #[error(transparent)]
-    Unexpected(Box<dyn Error>),
+    Unexpected(#[from] error::Unexpected),
 }
 
 /// git::Store implements the Store trait for any Descr::Git based Origins. If any non-git
@@ -98,17 +97,17 @@ impl Store {
 
         let commit_object_id = repo
             .try_find_reference(&self.branch_ref(branch_name))
-            .map_err(|e| GetOriginError::Unexpected(Box::from(e)))?
+            .map_unexpected()?
             .ok_or(GetOriginError::InvalidBranchName)?
             .peel_to_id_in_place()
-            .map_err(|e| GetOriginError::Unexpected(Box::from(e)))?
+            .map_unexpected()?
             .detach();
 
         let tree_object_id = repo
             .find_object(commit_object_id)
-            .map_err(|e| GetOriginError::Unexpected(Box::from(e)))?
+            .map_unexpected()?
             .try_to_commit_ref()
-            .map_err(|e| GetOriginError::Unexpected(Box::from(e)))?
+            .map_unexpected()?
             .tree();
 
         Ok(sync::Arc::from(Origin {
@@ -132,8 +131,7 @@ impl Store {
         // if the path doesn't exist then use the gix clone feature to clone it into the
         // directory.
         if fs::read_dir(repo_path).is_err() {
-            fs::create_dir_all(repo_path)
+            fs::create_dir_all(repo_path).map_unexpected()?;
-                .map_err(|e| store::SyncError::Unexpected(Box::from(e)))?;
 
             let origin::Descr::Git {
                 ref url,
@@ -148,7 +146,7 @@ impl Store {
                     gixCloneErr::UrlParse(_) | gixCloneErr::CanonicalizeUrl { .. } => {
                         store::SyncError::InvalidURL
                     }
-                    _ => store::SyncError::Unexpected(Box::from(e)),
+                    _ => e.to_unexpected().into(),
                 })?
                 .fetch_only(Discard, should_interrupt)
                 .map_err(|_| store::SyncError::InvalidURL)?;
@@ -156,36 +154,35 @@ impl Store {
             // Check to make sure the branch name exists
             // TODO if this fails we should delete repo_path
             repo.try_find_reference(&self.branch_ref(branch_name))
-                .map_err(|e| store::SyncError::Unexpected(Box::from(e)))?
+                .map_unexpected()?
                 .ok_or(store::SyncError::InvalidBranchName)?;
 
             // Add the descr to the repo directory, so we can know the actual descr later
             // TODO if this fails we should delete repo_path
-            let descr_file = fs::File::create(self.descr_file_path(descr.id().as_ref()))
+            let descr_file =
-                .map_err(|e| store::SyncError::Unexpected(Box::from(e)))?;
+                fs::File::create(self.descr_file_path(descr.id().as_ref())).map_unexpected()?;
 
-            serde_json::to_writer(descr_file, &descr)
+            serde_json::to_writer(descr_file, &descr).map_unexpected()?;
-                .map_err(|e| store::SyncError::Unexpected(Box::from(e)))?;
 
             return Ok(repo);
         }
 
         let direction = gix::remote::Direction::Fetch;
 
-        let repo = gix::open(repo_path).map_err(|e| store::SyncError::Unexpected(Box::from(e)))?;
+        let repo = gix::open(repo_path).map_unexpected()?;
 
         let remote = repo
             .find_default_remote(direction)
-            .ok_or_else(|| store::SyncError::Unexpected(Box::from("no default configured")))?
+            .ok_or_else(|| error::Unexpected::from("no default configured"))?
-            .map_err(|e| store::SyncError::Unexpected(Box::from(e)))?;
+            .map_unexpected()?;
 
         remote
             .connect(direction)
-            .map_err(|e| store::SyncError::Unexpected(Box::from(e)))?
+            .map_unexpected()?
             .prepare_fetch(Discard, Default::default())
-            .map_err(|e| store::SyncError::Unexpected(Box::from(e)))?
+            .map_unexpected()?
             .receive(Discard, should_interrupt)
-            .map_err(|e| store::SyncError::Unexpected(Box::from(e)))?;
+            .map_unexpected()?;
 
         Ok(repo)
     }
@@ -256,15 +253,15 @@ impl super::Store for sync::Arc<Store> {
 
         fs::read_dir(&repo_path).map_err(|e| match e.kind() {
             io::ErrorKind::NotFound => store::GetError::NotFound,
-            _ => store::GetError::Unexpected(Box::from(e)),
+            _ => e.to_unexpected().into(),
         })?;
 
-        let repo = gix::open(&repo_path).map_err(|e| store::GetError::Unexpected(Box::from(e)))?;
+        let repo = gix::open(&repo_path).map_unexpected()?;
 
         let origin = self.get_origin(repo, descr.clone()).map_err(|e| match e {
             // it's not expected that the branch name is invalid at this point, it must have
             // existed for sync to have been successful.
-            GetOriginError::InvalidBranchName => store::GetError::Unexpected(Box::from(e)),
+            GetOriginError::InvalidBranchName => e.to_unexpected().into(),
             GetOriginError::Unexpected(e) => store::GetError::Unexpected(e),
         })?;
 
@@ -276,36 +273,30 @@ impl super::Store for sync::Arc<Store> {
 
     fn all_descrs(&self) -> store::AllDescrsResult<Self::AllDescrsIter<'_>> {
         Ok(Box::from(
-                fs::read_dir(&self.dir_path)
+            fs::read_dir(&self.dir_path).map_unexpected()?.map(
-                    .map_err(|e| store::AllDescrsError::Unexpected(Box::from(e)))?
+                |dir_entry_res: io::Result<fs::DirEntry>| -> store::AllDescrsResult<origin::Descr> {
-                    .map(
+                    let descr_id: String = dir_entry_res
-                        |dir_entry_res: io::Result<fs::DirEntry>| -> store::AllDescrsResult<origin::Descr> {
+                        .map_unexpected()?
-                            let descr_id: String = dir_entry_res
+                        .file_name()
-                                .map_err(|e| store::AllDescrsError::Unexpected(Box::from(e)))?
+                        .to_str()
-                                .file_name()
+                        .ok_or_else(|| {
-                                .to_str()
+                            error::Unexpected::from("couldn't convert os string to &str")
-                                .ok_or_else(|| {
+                        })?
-                                    store::AllDescrsError::Unexpected(Box::from(
+                        .into();
-                                        "couldn't convert os string to &str",
-                                    ))
-                                })?
-                                .into();
 
-                            let descr_file_path = self.descr_file_path(descr_id.as_ref());
+                    let descr_file_path = self.descr_file_path(descr_id.as_ref());
 
-                            // TODO it's possible that opening the file will fail if syncing is
+                    // TODO it's possible that opening the file will fail if syncing is
-                            // still ongoing, as writing the descr file is the last step after
+                    // still ongoing, as writing the descr file is the last step after
-                            // initial sync has succeeded.
+                    // initial sync has succeeded.
-                            let descr_file = fs::File::open(descr_file_path)
+                    let descr_file = fs::File::open(descr_file_path).map_unexpected()?;
-                                .map_err(|e| store::AllDescrsError::Unexpected(Box::from(e)))?;
 
-                            let descr = serde_json::from_reader(descr_file)
+                    let descr = serde_json::from_reader(descr_file).map_unexpected()?;
-                                .map_err(|e| store::AllDescrsError::Unexpected(Box::from(e)))?;
 
-                            Ok(descr)
+                    Ok(descr)
-                        },
+                },
-                    ),
+            ),
-            ))
+        ))
     }
 }