#hubble-469: bring the fake gcs make target back in, review feedback

exp/services/ledgerexporter/DEVELOPER_GUIDE.md

@@ -39,6 +39,8 @@ The Dockerfile contains all the necessary dependencies (e.g., Stellar-core) requ
 
 - Run: For instructions on running the Docker container, refer to the [Installation Guide](./README.md).
 
+- Run ledgerexporter with a local, fake GCS backend: Requires `make docker-build` first, then run `make docker-test-fake-gcs`. This will run the ledger exporter against `testnet` and export to the 'fake' GCS instance started in the container.
+
 ## Running Integration Tests:
 from top directory of stellar/go repo, run go test to launch ledger exporter integration
 tests.

exp/services/ledgerexporter/Makefile

@@ -14,6 +14,32 @@ $(if $(STELLAR_CORE_VERSION), --build-arg STELLAR_CORE_VERSION=$(STELLAR_CORE_VE
 	-t $(DOCKER_IMAGE):$(VERSION) \
 	-t $(DOCKER_IMAGE):latest .
 
+docker-clean:
+	$(SUDO) docker stop fake-gcs-server || true
+	$(SUDO) docker rm fake-gcs-server || true
+	$(SUDO) rm -rf ${PWD}/storage || true
+	$(SUDO) docker network rm test-network || true
+
+docker-test-fake-gcs: docker-clean
+	# Create temp storage dir
+	$(SUDO) mkdir -p ${PWD}/storage/exporter-test 
+
+	# Create test network for docker
+	$(SUDO) docker network create test-network
+
+	# Run the fake GCS server
+	$(SUDO) docker run -d --name fake-gcs-server -p 4443:4443 \
+		 -v ${PWD}/storage:/data --network test-network fsouza/fake-gcs-server -scheme http
+
+	# Run the ledger-exporter
+	$(SUDO) docker run --platform linux/amd64 -t --network test-network\
+		 -v ${PWD}/exp/services/ledgerexporter/docker/config.test.toml:/config.toml \
+		 -e STORAGE_EMULATOR_HOST=http://fake-gcs-server:4443 \
+		 $(DOCKER_IMAGE):$(VERSION) \
+		 scan-and-fill --start 1000 --end 2000
+
+	$(MAKE) docker-clean
+
 docker-push:
 	$(SUDO) docker push $(DOCKER_IMAGE):$(VERSION)
 	$(SUDO) docker push $(DOCKER_IMAGE):latest

exp/services/ledgerexporter/docker/config.test.toml

@@ -0,0 +1,13 @@
+[datastore_config]
+type = "GCS"
+
+[datastore_config.params]
+destination_bucket_path = "exporter-test/ledgers/testnet"
+
+[datastore_config.schema]
+ledgers_per_file = 1
+files_per_partition = 64000
+
+[stellar_core_config]
+  network = "testnet"
+