Remove polylith/API mode (#2967)

This removes most of the code used for polylith/API mode.

This removes the `/api` internal endpoints entirely. 

Binary size change roughly 5%: 
```
51437560 Feb 13 10:15 dendrite-monolith-server # old
48759008 Feb 13 10:15 dendrite-monolith-server # new
```

11 files changed, 17 insertions, 180 deletions

diff --git a/build/dendritejs-pinecone/main.go b/build/dendritejs-pinecone/main.go
index f44a7748..f3fcb03e 100644
--- a/build/dendritejs-pinecone/main.go
+++ b/build/dendritejs-pinecone/main.go
@@ -177,7 +177,7 @@ func startup() {
 	if err := cfg.Derive(); err != nil {
 		logrus.Fatalf("Failed to derive values from config: %s", err)
 	}
-	base := base.NewBaseDendrite(cfg, "Monolith")
+	base := base.NewBaseDendrite(cfg)
 	defer base.Close() // nolint: errcheck
 
 	rsAPI := roomserver.NewInternalAPI(base)
@@ -215,7 +215,6 @@ func startup() {
 	monolith.AddAllPublicRoutes(base)
 
 	httpRouter := mux.NewRouter().SkipClean(true).UseEncodedPath()
-	httpRouter.PathPrefix(httputil.InternalPathPrefix).Handler(base.InternalAPIMux)
 	httpRouter.PathPrefix(httputil.PublicClientPathPrefix).Handler(base.PublicClientAPIMux)
 	httpRouter.PathPrefix(httputil.PublicMediaPathPrefix).Handler(base.PublicMediaAPIMux)
 
diff --git a/build/docker/README.md b/build/docker/README.md
index 7eb20d88..d8abd653 100644
--- a/build/docker/README.md
+++ b/build/docker/README.md
@@ -5,7 +5,6 @@ These are Docker images for Dendrite!
 They can be found on Docker Hub:
 
 - [matrixdotorg/dendrite-monolith](https://hub.docker.com/r/matrixdotorg/dendrite-monolith) for monolith deployments
-- [matrixdotorg/dendrite-polylith](https://hub.docker.com/r/matrixdotorg/dendrite-polylith) for polylith deployments
 
 ## Dockerfiles
 
@@ -15,7 +14,6 @@ repository, run:
 
 ```
 docker build . --target monolith -t matrixdotorg/dendrite-monolith
-docker build . --target polylith -t matrixdotorg/dendrite-monolith
 docker build . --target demo-pinecone -t matrixdotorg/dendrite-demo-pinecone
 docker build . --target demo-yggdrasil -t matrixdotorg/dendrite-demo-yggdrasil
 ```
@@ -25,7 +23,6 @@ docker build . --target demo-yggdrasil -t matrixdotorg/dendrite-demo-yggdrasil
 There are two sample `docker-compose` files:
 
 - `docker-compose.monolith.yml` which runs a monolith Dendrite deployment
-- `docker-compose.polylith.yml` which runs a polylith Dendrite deployment
 
 ## Configuration
 
@@ -51,7 +48,7 @@ docker run --rm --entrypoint="" \
 
 The key files will now exist in your current working directory, and can be mounted into place.
 
-## Starting Dendrite as a monolith deployment
+## Starting Dendrite
 
 Create your config based on the [`dendrite-sample.monolith.yaml`](https://github.com/matrix-org/dendrite/blob/main/dendrite-sample.monolith.yaml) sample configuration file.
 
@@ -61,16 +58,6 @@ Then start the deployment:
 docker-compose -f docker-compose.monolith.yml up
 ```
 
-## Starting Dendrite as a polylith deployment
-
-Create your config based on the [`dendrite-sample.polylith.yaml`](https://github.com/matrix-org/dendrite/blob/main/dendrite-sample.polylith.yaml) sample configuration file.
-
-Then start the deployment:
-
-```
-docker-compose -f docker-compose.polylith.yml up
-```
-
 ## Building the images
 
 The `build/docker/images-build.sh` script will build the base image, followed by
diff --git a/build/docker/docker-compose.polylith.yml b/build/docker/docker-compose.polylith.yml
deleted file mode 100644
index de0ab0aa..00000000
--- a/build/docker/docker-compose.polylith.yml
+++ /dev/null
@@ -1,143 +0,0 @@
-version: "3.4"
-services:
-  postgres:
-    hostname: postgres
-    image: postgres:14
-    restart: always
-    volumes:
-      - ./postgres/create_db.sh:/docker-entrypoint-initdb.d/20-create_db.sh
-      # To persist your PostgreSQL databases outside of the Docker image, 
-      # to prevent data loss, modify the following ./path_to path:
-      - ./path_to/postgresql:/var/lib/postgresql/data
-    environment:
-      POSTGRES_PASSWORD: itsasecret
-      POSTGRES_USER: dendrite
-    healthcheck:
-      test: ["CMD-SHELL", "pg_isready -U dendrite"]
-      interval: 5s
-      timeout: 5s
-      retries: 5
-    networks:
-      - internal
-
-  jetstream:
-    hostname: jetstream
-    image: nats:latest
-    command: |
-      --jetstream
-      --store_dir /var/lib/nats
-      --cluster_name Dendrite
-    volumes:
-      # To persist your NATS JetStream streams outside of the Docker image,
-      # prevent data loss, modify the following ./path_to path:
-      - ./path_to/nats:/var/lib/nats
-    networks:
-      - internal
-
-  client_api:
-    hostname: client_api
-    image: matrixdotorg/dendrite-polylith:latest
-    command: clientapi
-    volumes:
-      - ./config:/etc/dendrite
-    depends_on:
-      - jetstream
-      - postgres
-    networks:
-      - internal
-    restart: unless-stopped
-
-  media_api:
-    hostname: media_api
-    image: matrixdotorg/dendrite-polylith:latest
-    command: mediaapi
-    volumes:
-      - ./config:/etc/dendrite
-      - ./media:/var/dendrite/media
-    networks:
-      - internal
-    restart: unless-stopped
-
-  sync_api:
-    hostname: sync_api
-    image: matrixdotorg/dendrite-polylith:latest
-    command: syncapi
-    volumes:
-      - ./config:/etc/dendrite
-    depends_on:
-      - jetstream
-      - postgres
-    networks:
-      - internal
-    restart: unless-stopped
-
-  room_server:
-    hostname: room_server
-    image: matrixdotorg/dendrite-polylith:latest
-    command: roomserver
-    volumes:
-      - ./config:/etc/dendrite
-    depends_on:
-      - jetstream
-      - postgres
-    networks:
-      - internal
-    restart: unless-stopped
-
-  federation_api:
-    hostname: federation_api
-    image: matrixdotorg/dendrite-polylith:latest
-    command: federationapi
-    volumes:
-      - ./config:/etc/dendrite
-    depends_on:
-      - jetstream
-      - postgres
-    networks:
-      - internal
-    restart: unless-stopped
-      
-  key_server:
-    hostname: key_server
-    image: matrixdotorg/dendrite-polylith:latest
-    command: keyserver
-    volumes:
-      - ./config:/etc/dendrite
-    depends_on:
-      - jetstream
-      - postgres
-    networks:
-      - internal
-    restart: unless-stopped
-      
-  user_api:
-    hostname: user_api
-    image: matrixdotorg/dendrite-polylith:latest
-    command: userapi
-    volumes:
-      - ./config:/etc/dendrite
-    depends_on:
-      - jetstream
-      - postgres
-    networks:
-      - internal
-    restart: unless-stopped
-
-  appservice_api:
-    hostname: appservice_api
-    image: matrixdotorg/dendrite-polylith:latest
-    command: appservice
-    volumes:
-      - ./config:/etc/dendrite
-    networks:
-      - internal
-    depends_on:
-      - jetstream
-      - postgres
-      - room_server
-      - user_api
-    restart: unless-stopped
-
-networks:
-  internal:
-    attachable: true
diff --git a/build/docker/images-build.sh b/build/docker/images-build.sh
index d97a701e..bf227968 100755
--- a/build/docker/images-build.sh
+++ b/build/docker/images-build.sh
@@ -7,6 +7,5 @@ TAG=${1:-latest}
 echo "Building tag '${TAG}'"
 
 docker build . --target monolith -t matrixdotorg/dendrite-monolith:${TAG}
-docker build . --target polylith -t matrixdotorg/dendrite-monolith:${TAG}
 docker build . --target demo-pinecone -t matrixdotorg/dendrite-demo-pinecone:${TAG}
 docker build . --target demo-yggdrasil -t matrixdotorg/dendrite-demo-yggdrasil:${TAG}
\ No newline at end of file
diff --git a/build/docker/images-pull.sh b/build/docker/images-pull.sh
index f3f98ce7..7772ca74 100755
--- a/build/docker/images-pull.sh
+++ b/build/docker/images-pull.sh
@@ -5,4 +5,3 @@ TAG=${1:-latest}
 echo "Pulling tag '${TAG}'"
 
 docker pull matrixdotorg/dendrite-monolith:${TAG}
-docker pull matrixdotorg/dendrite-polylith:${TAG}
\ No newline at end of file
diff --git a/build/docker/images-push.sh b/build/docker/images-push.sh
index 248fdee2..d166d355 100755
--- a/build/docker/images-push.sh
+++ b/build/docker/images-push.sh
@@ -5,4 +5,3 @@ TAG=${1:-latest}
 echo "Pushing tag '${TAG}'"
 
 docker push matrixdotorg/dendrite-monolith:${TAG}
-docker push matrixdotorg/dendrite-polylith:${TAG}
\ No newline at end of file
diff --git a/build/gobind-yggdrasil/monolith.go b/build/gobind-yggdrasil/monolith.go
index 8c2d0a00..fad850a9 100644
--- a/build/gobind-yggdrasil/monolith.go
+++ b/build/gobind-yggdrasil/monolith.go
@@ -127,8 +127,8 @@ func (m *DendriteMonolith) Start() {
 
 	cfg := &config.Dendrite{}
 	cfg.Defaults(config.DefaultOpts{
-		Generate:   true,
-		Monolithic: true,
+		Generate:       true,
+		SingleDatabase: true,
 	})
 	cfg.Global.ServerName = gomatrixserverlib.ServerName(hex.EncodeToString(pk))
 	cfg.Global.PrivateKey = sk
@@ -149,7 +149,7 @@ func (m *DendriteMonolith) Start() {
 		panic(err)
 	}
 
-	base := base.NewBaseDendrite(cfg, "Monolith")
+	base := base.NewBaseDendrite(cfg)
 	base.ConfigureAdminEndpoints()
 	m.processContext = base.ProcessContext
 	defer base.Close() // nolint: errcheck
@@ -194,7 +194,6 @@ func (m *DendriteMonolith) Start() {
 	monolith.AddAllPublicRoutes(base)
 
 	httpRouter := mux.NewRouter()
-	httpRouter.PathPrefix(httputil.InternalPathPrefix).Handler(base.InternalAPIMux)
 	httpRouter.PathPrefix(httputil.PublicClientPathPrefix).Handler(base.PublicClientAPIMux)
 	httpRouter.PathPrefix(httputil.PublicMediaPathPrefix).Handler(base.PublicMediaAPIMux)
 	httpRouter.PathPrefix(httputil.DendriteAdminPathPrefix).Handler(base.DendriteAdminMux)
diff --git a/build/scripts/Complement.Dockerfile b/build/scripts/Complement.Dockerfile
index 3a00fbdf..70bbe8f9 100644
--- a/build/scripts/Complement.Dockerfile
+++ b/build/scripts/Complement.Dockerfile
@@ -16,8 +16,8 @@ RUN --mount=target=. \
     --mount=type=cache,target=/root/.cache/go-build \
     CGO_ENABLED=${CGO} go build -o /dendrite ./cmd/generate-config && \
     CGO_ENABLED=${CGO} go build -o /dendrite ./cmd/generate-keys && \
-    CGO_ENABLED=${CGO} go build -o /dendrite ./cmd/dendrite-monolith-server && \
-    CGO_ENABLED=${CGO} go test -c -cover -covermode=atomic -o /dendrite/dendrite-monolith-server-cover -coverpkg "github.com/matrix-org/..." ./cmd/dendrite-monolith-server && \
+    CGO_ENABLED=${CGO} go build -o /dendrite/dendrite ./cmd/dendrite && \
+    CGO_ENABLED=${CGO} go test -c -cover -covermode=atomic -o /dendrite/dendrite-cover -coverpkg "github.com/matrix-org/..." ./cmd/dendrite && \
     cp build/scripts/complement-cmd.sh /complement-cmd.sh
 
 WORKDIR /dendrite
diff --git a/build/scripts/ComplementLocal.Dockerfile b/build/scripts/ComplementLocal.Dockerfile
index e3fbe1aa..0b80cfc4 100644
--- a/build/scripts/ComplementLocal.Dockerfile
+++ b/build/scripts/ComplementLocal.Dockerfile
@@ -19,13 +19,13 @@ WORKDIR /runtime
 # This script compiles Dendrite for us.
 RUN echo '\
     #!/bin/bash -eux \n\
-    if test -f "/runtime/dendrite-monolith-server" && test -f "/runtime/dendrite-monolith-server-cover"; then \n\
+    if test -f "/runtime/dendrite" && test -f "/runtime/dendrite-cover"; then \n\
     echo "Skipping compilation; binaries exist" \n\
     exit 0 \n\
     fi \n\
     cd /dendrite \n\
-    go build -v -o /runtime /dendrite/cmd/dendrite-monolith-server \n\
-    go test -c -cover -covermode=atomic -o /runtime/dendrite-monolith-server-cover -coverpkg "github.com/matrix-org/..." /dendrite/cmd/dendrite-monolith-server \n\
+    go build -v -o /runtime /dendrite/cmd/dendrite \n\
+    go test -c -cover -covermode=atomic -o /runtime/dendrite-cover -coverpkg "github.com/matrix-org/..." /dendrite/cmd/dendrite \n\
     ' > compile.sh && chmod +x compile.sh
 
 # This script runs Dendrite for us. Must be run in the /runtime directory.
@@ -35,8 +35,8 @@ RUN echo '\
     ./generate-keys -keysize 1024 --server $SERVER_NAME --tls-cert server.crt --tls-key server.key --tls-authority-cert /complement/ca/ca.crt --tls-authority-key /complement/ca/ca.key \n\
     ./generate-config -server $SERVER_NAME --ci > dendrite.yaml \n\
     cp /complement/ca/ca.crt /usr/local/share/ca-certificates/ && update-ca-certificates \n\
-    [ ${COVER} -eq 1 ] && exec ./dendrite-monolith-server-cover --test.coverprofile=integrationcover.log --really-enable-open-registration --tls-cert server.crt --tls-key server.key --config dendrite.yaml \n\
-    exec ./dendrite-monolith-server --really-enable-open-registration --tls-cert server.crt --tls-key server.key --config dendrite.yaml \n\
+    [ ${COVER} -eq 1 ] && exec ./dendrite-cover --test.coverprofile=integrationcover.log --really-enable-open-registration --tls-cert server.crt --tls-key server.key --config dendrite.yaml \n\
+    exec ./dendrite --really-enable-open-registration --tls-cert server.crt --tls-key server.key --config dendrite.yaml \n\
     ' > run.sh && chmod +x run.sh
 
 
diff --git a/build/scripts/ComplementPostgres.Dockerfile b/build/scripts/ComplementPostgres.Dockerfile
index 444cb947..d4b6d3f7 100644
--- a/build/scripts/ComplementPostgres.Dockerfile
+++ b/build/scripts/ComplementPostgres.Dockerfile
@@ -34,8 +34,8 @@ RUN --mount=target=. \
     --mount=type=cache,target=/root/.cache/go-build \
     CGO_ENABLED=${CGO} go build -o /dendrite ./cmd/generate-config && \
     CGO_ENABLED=${CGO} go build -o /dendrite ./cmd/generate-keys && \
-    CGO_ENABLED=${CGO} go build -o /dendrite ./cmd/dendrite-monolith-server && \
-    CGO_ENABLED=${CGO} go test -c -cover -covermode=atomic -o /dendrite/dendrite-monolith-server-cover -coverpkg "github.com/matrix-org/..." ./cmd/dendrite-monolith-server && \
+    CGO_ENABLED=${CGO} go build -o /dendrite/dendrite ./cmd/dendrite && \
+    CGO_ENABLED=${CGO} go test -c -cover -covermode=atomic -o /dendrite/dendrite-cover -coverpkg "github.com/matrix-org/..." ./cmd/dendrite && \
     cp build/scripts/complement-cmd.sh /complement-cmd.sh
 
 WORKDIR /dendrite
diff --git a/build/scripts/complement-cmd.sh b/build/scripts/complement-cmd.sh
index def091e2..52b063d0 100755
--- a/build/scripts/complement-cmd.sh
+++ b/build/scripts/complement-cmd.sh
@@ -4,19 +4,17 @@
 
 if [[ "${COVER}" -eq 1 ]]; then
   echo "Running with coverage"
-  exec /dendrite/dendrite-monolith-server-cover \
+  exec /dendrite/dendrite-cover \
     --really-enable-open-registration \
     --tls-cert server.crt \
     --tls-key server.key \
     --config dendrite.yaml \
-    -api=${API:-0} \
     --test.coverprofile=complementcover.log
 else
   echo "Not running with coverage"
-  exec /dendrite/dendrite-monolith-server \
+  exec /dendrite/dendrite \
     --really-enable-open-registration \
     --tls-cert server.crt \
     --tls-key server.key \
-    --config dendrite.yaml \
-    -api=${API:-0}
+    --config dendrite.yaml
 fi