attestation-service: Replace anyhow error crate with thiserror crate

Fixes: #231
Signed-off-by: Kartik Joshi <kartikjoshi@microsoft.com>

attestation-service/attestation-service/src/bin/grpc/mod.rs

@@ -1,13 +1,15 @@
-use anyhow::{anyhow, Result};
 use attestation_service::policy_engine::SetPolicyInput;
 use attestation_service::HashAlgorithm;
-use attestation_service::{config::Config, AttestationService as Service, Tee};
+use attestation_service::{
+    config::Config, config::ConfigError, AttestationService as Service, ServiceError, Tee,
+};
 use base64::engine::general_purpose::URL_SAFE_NO_PAD;
 use base64::Engine;
 use log::{debug, info};
 use std::net::SocketAddr;
 use std::path::Path;
 use std::sync::Arc;
+use thiserror::Error;
 use tokio::sync::RwLock;
 use tonic::transport::Server;
 use tonic::{Request, Response, Status};
@@ -40,15 +42,24 @@ fn to_kbs_tee(tee: GrpcTee) -> Tee {
     }
 }
 
+#[derive(Error, Debug)]
+pub enum GrpcError {
+    #[error("Read AS config file failed")]
+    Config(#[source] ConfigError),
+    #[error("Creating attestation service failed")]
+    Service(#[from] ServiceError),
+    #[error("tonic transport error")]
+    TonicTransport(#[from] tonic::transport::Error),
+}
+
 pub struct AttestationServer {
     attestation_service: Service,
 }
 
 impl AttestationServer {
-    pub async fn new(config_path: Option<String>) -> Result<Self> {
+    pub async fn new(config_path: Option<String>) -> Result<Self, GrpcError> {
         let config = match config_path {
-            Some(path) => Config::try_from(Path::new(&path))
-                .map_err(|e| anyhow!("Read AS config file failed: {:?}", e))?,
+            Some(path) => Config::try_from(Path::new(&path)).map_err(GrpcError::Config)?,
             None => Config::default(),
         };
 
@@ -222,7 +233,7 @@ impl ReferenceValueProviderService for Arc<RwLock<AttestationServer>> {
     }
 }
 
-pub async fn start(socket: SocketAddr, config_path: Option<String>) -> Result<()> {
+pub async fn start(socket: SocketAddr, config_path: Option<String>) -> Result<(), GrpcError> {
     info!("Listen socket: {}", &socket);
 
     let attestation_server = Arc::new(RwLock::new(AttestationServer::new(config_path).await?));

attestation-service/attestation-service/src/bin/restful-as.rs

@@ -1,15 +1,16 @@
 use std::{net::SocketAddr, path::Path, sync::Arc};
 
 use actix_web::{web, App, HttpServer};
-use anyhow::{anyhow, Context, Result};
-use attestation_service::{config::Config, AttestationService};
+use anyhow::Result;
+use attestation_service::{config::Config, config::ConfigError, AttestationService, ServiceError};
 use clap::{arg, command, Parser};
 use log::info;
 use openssl::{
     pkey::PKey,
     ssl::{SslAcceptor, SslMethod},
 };
 use strum::{AsRefStr, EnumString};
+use thiserror::Error;
 use tokio::sync::RwLock;
 
 use crate::restful::{attestation, set_policy};
@@ -49,17 +50,38 @@ enum WebApi {
     Policy,
 }
 
+#[derive(Error, Debug)]
+pub enum RestfulError {
+    #[error("Creating service failed")]
+    Service(#[from] ServiceError),
+    #[error("Failed to read AS config file")]
+    Config(#[from] ConfigError),
+    #[error("Openssl errorstack")]
+    Openssl(#[from] openssl::error::ErrorStack),
+    #[error("read HTTPS private key")]
+    ReadHttpsKey(#[source] std::io::Error),
+    #[error("read HTTPS private key from pem")]
+    ReadHttpsKeyFromPem(#[source] openssl::error::ErrorStack),
+    #[error("set private key failed")]
+    SetPrivateKey(#[source] openssl::error::ErrorStack),
+    #[error("set HTTPS public key cert")]
+    SetHttpsCert(#[source] openssl::error::ErrorStack),
+    #[error("io error")]
+    IO(#[from] std::io::Error),
+    #[error("Error")]
+    Anyhow(#[from] anyhow::Error),
+}
+
 #[actix_web::main]
-async fn main() -> Result<()> {
+async fn main() -> Result<(), RestfulError> {
     env_logger::init_from_env(env_logger::Env::new().default_filter_or("info"));
 
     let cli = Cli::parse();
 
     let config = match cli.config_file {
         Some(path) => {
             info!("Using config file {path}");
-            Config::try_from(Path::new(&path))
-                .map_err(|e| anyhow!("Read AS config file failed: {:?}", e))?
+            Config::try_from(Path::new(&path))?
         }
         None => {
             info!("No confile path provided, use default one.");
@@ -83,16 +105,16 @@ async fn main() -> Result<()> {
 
             let prikey = tokio::fs::read(prikey)
                 .await
-                .context("read HTTPS private key")?;
+                .map_err(RestfulError::ReadHttpsKey)?;
             let prikey =
-                PKey::private_key_from_pem(&prikey).context("read HTTPS private key from pem")?;
+                PKey::private_key_from_pem(&prikey).map_err(RestfulError::ReadHttpsKeyFromPem)?;
 
             builder
                 .set_private_key(&prikey)
-                .context("set private key failed")?;
+                .map_err(RestfulError::SetPrivateKey)?;
             builder
                 .set_certificate_chain_file(pubkey_cert)
-                .context("set HTTPS public key cert")?;
+                .map_err(RestfulError::SetHttpsCert)?;
             log::info!("starting HTTPS server at https://{}", cli.socket);
             server.bind_openssl(cli.socket, builder)?.run()
         }
@@ -105,6 +127,5 @@ async fn main() -> Result<()> {
     };
 
     server.await?;
-
     Ok(())
 }

attestation-service/attestation-service/src/config.rs

@@ -1,10 +1,10 @@
 use crate::rvps::RvpsConfig;
 use crate::token::{AttestationTokenBrokerType, AttestationTokenConfig};
 
-use anyhow::{anyhow, Result};
 use serde::Deserialize;
 use std::fs::File;
 use std::path::{Path, PathBuf};
+use thiserror::Error;
 
 /// Environment macro for Attestation Service work dir.
 const AS_WORK_DIR: &str = "AS_WORK_DIR";
@@ -31,6 +31,18 @@ pub struct Config {
     pub attestation_token_config: AttestationTokenConfig,
 }
 
+#[derive(Error, Debug)]
+pub enum ConfigError {
+    #[error("io error")]
+    IO(#[from] std::io::Error),
+    #[error("failed to parse AS config file")]
+    FileParse(#[source] std::io::Error),
+    #[error("failed to parse AS config file")]
+    JsonFileParse(#[source] serde_json::Error),
+    #[error("Illegal format of the content of the configuration file")]
+    SerdeJson(#[from] serde_json::Error),
+}
+
 impl Default for Config {
     // Construct a default instance of `Config`
     fn default() -> Config {
@@ -63,12 +75,9 @@ impl TryFrom<&Path> for Config {
     ///            "duration_min": 5
     ///        }
     ///    }
-    type Error = anyhow::Error;
-    fn try_from(config_path: &Path) -> Result<Self, Self::Error> {
-        let file = File::open(config_path)
-            .map_err(|e| anyhow!("failed to open AS config file {}", e.to_string()))?;
-
-        serde_json::from_reader::<File, Config>(file)
-            .map_err(|e| anyhow!("failed to parse AS config file {}", e.to_string()))
+    type Error = ConfigError;
+    fn try_from(config_path: &Path) -> Result<Self, ConfigError> {
+        let file = File::open(config_path).map_err(ConfigError::FileParse)?;
+        serde_json::from_reader::<File, Config>(file).map_err(ConfigError::JsonFileParse)
     }
 }

attestation-service/attestation-service/src/lib.rs

@@ -17,12 +17,13 @@ use config::Config;
 pub use kbs_types::{Attestation, Tee};
 use log::debug;
 use policy_engine::{PolicyEngine, PolicyEngineType, SetPolicyInput};
-use rvps::RvpsApi;
+use rvps::{RvpsApi, RvpsError};
 use serde_json::{json, Value};
 use serde_variant::to_variant_name;
 use sha2::{Digest, Sha256, Sha384, Sha512};
 use std::{collections::HashMap, str::FromStr};
 use strum::{AsRefStr, EnumString};
+use thiserror::Error;
 use tokio::fs;
 use verifier::{InitDataHash, ReportData};
 
@@ -77,6 +78,20 @@ pub enum Data {
     Structured(Value),
 }
 
+#[derive(Error, Debug)]
+pub enum ServiceError {
+    #[error("io error")]
+    IO(#[from] std::io::Error),
+    #[error("Create AS work dir failed")]
+    CreateDir(#[source] std::io::Error),
+    #[error("Policy Engine is not supported")]
+    ParseError(#[source] strum::ParseError),
+    #[error("Create rvps failed.")]
+    Rvps(#[source] RvpsError),
+    #[error("Error")]
+    Anyhow(#[from] anyhow::Error),
+}
+
 pub struct AttestationService {
     _config: Config,
     policy_engine: Box<dyn PolicyEngine + Send + Sync>,
@@ -86,20 +101,20 @@ pub struct AttestationService {
 
 impl AttestationService {
     /// Create a new Attestation Service instance.
-    pub async fn new(config: Config) -> Result<Self> {
+    pub async fn new(config: Config) -> Result<Self, ServiceError> {
         if !config.work_dir.as_path().exists() {
             fs::create_dir_all(&config.work_dir)
                 .await
-                .context("Create AS work dir failed: {:?}")?;
+                .map_err(ServiceError::CreateDir)?;
         }
 
         let policy_engine = PolicyEngineType::from_str(&config.policy_engine)
-            .map_err(|_| anyhow!("Policy Engine {} is not supported", &config.policy_engine))?
+            .map_err(ServiceError::ParseError)?
             .to_policy_engine(config.work_dir.as_path())?;
 
         let rvps = rvps::initialize_rvps_client(&config.rvps_config)
             .await
-            .context("create rvps failed.")?;
+            .map_err(ServiceError::Rvps)?;
 
         let token_broker = config
             .attestation_token_broker
@@ -114,11 +129,10 @@ impl AttestationService {
     }
 
     /// Set Attestation Verification Policy.
-    pub async fn set_policy(&mut self, input: SetPolicyInput) -> Result<()> {
-        self.policy_engine
-            .set_policy(input)
-            .await
-            .map_err(|e| anyhow!("Cannot Set Policy: {:?}", e))
+    pub async fn set_policy(&mut self, input: SetPolicyInput) -> Result<(), ServiceError> {
+        self.policy_engine.set_policy(input).await?;
+
+        Ok(())
     }
 
     /// Evaluate Attestation Evidence.

attestation-service/attestation-service/src/rvps/builtin.rs

@@ -1,9 +1,9 @@
+use super::RvpsApi;
 use anyhow::*;
 use async_trait::async_trait;
+use core::result::Result::Ok;
 use reference_value_provider_service::{Config, Core};
 
-use super::RvpsApi;
-
 pub struct Rvps {
     core: Core,
 }
@@ -18,7 +18,8 @@ impl Rvps {
 #[async_trait]
 impl RvpsApi for Rvps {
     async fn verify_and_extract(&mut self, message: &str) -> Result<()> {
-        self.core.verify_and_extract(message).await
+        self.core.verify_and_extract(message).await?;
+        Ok(())
     }
 
     async fn get_digests(&self, name: &str) -> Result<Vec<String>> {

attestation-service/attestation-service/src/rvps/grpc.rs

@@ -1,4 +1,5 @@
-use anyhow::*;
+use crate::rvps::RvpsError;
+use anyhow::{Context, Result};
 use tokio::sync::Mutex;
 
 use self::rvps_api::{
@@ -17,15 +18,14 @@ pub struct Agent {
 }
 
 impl Agent {
-    pub async fn new(addr: &str) -> Result<Self> {
+    pub async fn new(addr: &str) -> Result<Self, RvpsError> {
         Ok(Self {
             client: Mutex::new(
                 ReferenceValueProviderServiceClient::connect(addr.to_string()).await?,
             ),
         })
     }
 }
-
 #[async_trait::async_trait]
 impl RvpsApi for Agent {
     async fn verify_and_extract(&mut self, message: &str) -> Result<()> {

attestation-service/attestation-service/src/rvps/mod.rs

@@ -3,11 +3,12 @@
 // SPDX-License-Identifier: Apache-2.0
 //
 
-use anyhow::*;
+use anyhow::Result;
 use log::{info, warn};
 use reference_value_provider_service::config::{Config as RvpsCrateConfig, DEFAULT_STORAGE_TYPE};
 use serde::Deserialize;
 use serde_json::{json, Value};
+use thiserror::Error;
 
 /// The interfaces of Reference Value Provider Service
 /// * `verify_and_extract` is responsible for verify a message and
@@ -72,7 +73,23 @@ impl Default for RvpsConfig {
     }
 }
 
-pub async fn initialize_rvps_client(config: &RvpsConfig) -> Result<Box<dyn RvpsApi + Send + Sync>> {
+#[derive(Error, Debug)]
+pub enum RvpsError {
+    #[error("feature `rvps-grpc` or `rvps-builtin` should be enabled")]
+    FeatureNotEnabled,
+    #[error("Serde Json Error")]
+    SerdeJson(#[from] serde_json::Error),
+    #[error("Returned status")]
+    Status(#[from] tonic::Status),
+    #[error("tonic transport error")]
+    TonicTransport(#[from] tonic::transport::Error),
+    #[error("Error")]
+    Anyhow(#[from] anyhow::Error),
+}
+
+pub async fn initialize_rvps_client(
+    config: &RvpsConfig,
+) -> Result<Box<dyn RvpsApi + Send + Sync>, RvpsError> {
     cfg_if::cfg_if! {
         if #[cfg(feature = "rvps-grpc")] {
             if !config.remote_addr.is_empty() {
@@ -85,15 +102,15 @@ pub async fn initialize_rvps_client(config: &RvpsConfig) -> Result<Box<dyn RvpsA
                         warn!("No RVPS address provided and will launch a built-in rvps");
                         Ok(Box::new(builtin::Rvps::new(config.clone().into())?) as Box<dyn RvpsApi + Send + Sync>)
                     } else {
-                        Err(anyhow!("either feature `rvps-grpc` or `rvps-builtin` should be enabled."))
+                        return RvpsError::FeatureNotEnabled;
                     }
                 }
             }
         } else if #[cfg(feature = "rvps-builtin")] {
             info!("launch a built-in RVPS.");
             Ok(Box::new(builtin::Rvps::new(config.clone().into())) as Box<dyn RvpsApi + Send + Sync>)
         } else {
-            Err(anyhow!("either feature `rvps-grpc` or `rvps-builtin` should be enabled."))
+            return RvpsError::FeatureNotEnabled;
         }
     }
 }