Turn MAX_PUSH_BYTES into a knob. (#24162)

GitOrigin-RevId: 6f10f889ca70ba97a7e818af99fa951d563b8e56

Author: Preslav Le

crates/common/src/knobs.rs

@@ -972,3 +972,8 @@ pub static ALLOW_STORAGE_GET_VIA_DOCUMENT_ID: LazyLock<bool> =
 /// See https://docs.rs/tower-http/0.5.0/tower_http/timeout/struct.TimeoutLayer.html
 pub static HTTP_SERVER_TIMEOUT_DURATION: LazyLock<Duration> =
     LazyLock::new(|| Duration::from_secs(env_config("HTTP_SERVER_TIMEOUT_SECONDS", 300)));
+
+/// The limit on the request size to /push_config.
+// Schema and code bundle pushes must be less than this.
+pub static MAX_PUSH_BYTES: LazyLock<usize> =
+    LazyLock::new(|| env_config("MAX_PUSH_BYTES", 100_000_000));

crates/local_backend/src/lib.rs

@@ -88,8 +88,6 @@ pub mod subs;
 mod test_helpers;
 
 pub const MAX_CONCURRENT_REQUESTS: usize = 128;
-// Schema and code bundle pushes must be less than this in 100MB
-pub const MAX_PUSH_BYTES: usize = 100_000_000;
 
 pub struct LocalAppState {
     // Origin for the server (e.g. http://127.0.0.1:3210, https://demo.convex.cloud)

crates/local_backend/src/router.rs

@@ -18,6 +18,7 @@ use common::{
     knobs::{
         MAX_BACKEND_ACTION_CALLBACKS_REQUEST_SIZE,
         MAX_BACKEND_PUBLIC_API_REQUEST_SIZE,
+        MAX_PUSH_BYTES,
     },
 };
 use http::{
@@ -109,7 +110,6 @@ use crate::{
         sync_client_version_url,
     },
     LocalAppState,
-    MAX_PUSH_BYTES,
 };
 
 pub async fn router(st: LocalAppState) -> Router {
@@ -142,7 +142,7 @@ pub async fn router(st: LocalAppState) -> Router {
                     StatusCode::INTERNAL_SERVER_ERROR
                 }))
                 .layer(RequestDecompressionLayer::new())
-                .layer(DefaultBodyLimit::max(MAX_PUSH_BYTES)),
+                .layer(DefaultBodyLimit::max(*MAX_PUSH_BYTES)),
         )
         .route("/get_config", post(get_config))
         .route("/get_config_hashes", post(get_config_hashes))