Allow disabling grpc at the build level

Cargo.toml

@@ -11,14 +11,18 @@ license = "MIT"
 keywords = ["nostr", "server"]
 categories = ["network-programming", "web-programming"]
 
+[features]
+default = ["grpc"]
+grpc = ["tonic", "prost", "tonic-build"]
+
 [dependencies]
 clap = { version = "4.0.32", features = ["env", "default", "derive"]}
 tracing = "0.1.37"
 tracing-appender = "0.2.2"
 tracing-subscriber = "0.3.16"
 tokio = { version = "1", features = ["full", "tracing", "signal"] }
-prost = "0.11"
-tonic = "0.8.3"
+prost = { version = "0.11", optional = true }
+tonic = { version = "0.8.3", optional = true }
 console-subscriber = "0.1.8"
 futures = "0.3"
 futures-util = "0.3"
@@ -63,4 +67,4 @@ log = "0.4"
 anyhow = "1"
 
 [build-dependencies]
-tonic-build = { version="0.8.3", features = ["prost"] }
+tonic-build = { version="0.8.3", features = ["prost"], optional = true }

build.rs

@@ -1,4 +1,5 @@
 fn main() -> Result<(), Box<dyn std::error::Error>> {
+    #[cfg(feature = "grpc")]
     tonic_build::configure()
         .build_server(false)
         .protoc_arg("--experimental_allow_proto3_optional")

src/db.rs

@@ -2,6 +2,7 @@
 use crate::config::Settings;
 use crate::error::{Error, Result};
 use crate::event::Event;
+#[cfg(feature = "grpc")]
 use crate::nauthz;
 use crate::notice::Notice;
 use crate::payment::PaymentMessage;
@@ -136,6 +137,7 @@ pub async fn db_writer(
     }
     // create a client if GRPC is enabled.
     // Check with externalized event admitter service, if one is defined.
+    #[cfg(feature = "grpc")]
     let mut grpc_client = if let Some(svr) = settings.grpc.event_admission_server {
         Some(nauthz::EventAuthzService::connect(&svr).await)
     } else {
@@ -345,29 +347,31 @@ pub async fn db_writer(
             }
         }
 
-        // nip05 address
-        let nip05_address: Option<crate::nip05::Nip05Name> =
-            validation.and_then(|x| x.ok().map(|y| y.name));
-
         // GRPC check
-        if let Some(ref mut c) = grpc_client {
-            trace!("checking if grpc permits");
-            let grpc_start = Instant::now();
-            let decision_res = c
-                .admit_event(
-                    &event,
-                    &subm_event.source_ip,
-                    subm_event.origin,
-                    subm_event.user_agent,
-                    nip05_address,
-                    subm_event.auth_pubkey,
-                )
-                .await;
-            match decision_res {
-                Ok(decision) => {
-                    if !decision.permitted() {
-                        // GPRC returned a decision to reject this event
-                        info!(
+        #[cfg(feature = "grpc")]
+        {
+            // nip05 address
+            let nip05_address: Option<crate::nip05::Nip05Name> =
+                validation.and_then(|x| x.ok().map(|y| y.name));
+
+            if let Some(ref mut c) = grpc_client {
+                trace!("checking if grpc permits");
+                let grpc_start = Instant::now();
+                let decision_res = c
+                    .admit_event(
+                        &event,
+                        &subm_event.source_ip,
+                        subm_event.origin,
+                        subm_event.user_agent,
+                        nip05_address,
+                        subm_event.auth_pubkey,
+                    )
+                    .await;
+                match decision_res {
+                    Ok(decision) => {
+                        if !decision.permitted() {
+                            // GPRC returned a decision to reject this event
+                            info!(
                             "GRPC rejected event: {:?} (kind: {}) from: {:?} in: {:?} (IP: {:?})",
                             event.get_event_id_prefix(),
                             event.kind,
@@ -375,17 +379,18 @@ pub async fn db_writer(
                             grpc_start.elapsed(),
                             subm_event.source_ip
                         );
-                        notice_tx
-                            .try_send(Notice::blocked(
-                                event.id,
-                                &decision.message().unwrap_or_default(),
-                            ))
-                            .ok();
-                        continue;
+                            notice_tx
+                                .try_send(Notice::blocked(
+                                    event.id,
+                                    &decision.message().unwrap_or_default(),
+                                ))
+                                .ok();
+                            continue;
+                        }
+                    }
+                    Err(e) => {
+                        warn!("GRPC server error: {:?}", e);
                     }
-                }
-                Err(e) => {
-                    warn!("GRPC server error: {:?}", e);
                 }
             }
         }

src/error.rs

@@ -66,6 +66,7 @@ pub enum Error {
     ChannelClosed,
     #[error("Authz error")]
     AuthzError,
+    #[cfg(feature = "grpc")]
     #[error("Tonic GRPC error")]
     TonicError(tonic::Status),
     #[error("Invalid AUTH message")]
@@ -151,6 +152,7 @@ impl From<config::ConfigError> for Error {
     }
 }
 
+#[cfg(feature = "grpc")]
 impl From<tonic::Status> for Error {
     /// Wrap Config error
     fn from(r: tonic::Status) -> Self {

src/lib.rs

@@ -8,6 +8,7 @@ pub mod error;
 pub mod event;
 pub mod hexrange;
 pub mod info;
+#[cfg(feature = "grpc")]
 pub mod nauthz;
 pub mod nip05;
 pub mod notice;