From b5c125a03deaa35259aa92405db78d350c35636e Mon Sep 17 00:00:00 2001
From: Eguzki Astiz Lezaun <eastizle@redhat.com>
Date: Tue, 31 Oct 2023 18:29:46 +0100
Subject: [PATCH] dev-environment: grpc

---
 dev-environments/grpc/Makefile            | 66 +++++++++++++++++++++++
 dev-environments/grpc/README.md           | 52 ++++++++++++++++++
 dev-environments/grpc/apicast-config.json | 35 ++++++++++++
 dev-environments/grpc/docker-compose.yml  | 40 ++++++++++++++
 4 files changed, 193 insertions(+)
 create mode 100644 dev-environments/grpc/Makefile
 create mode 100644 dev-environments/grpc/README.md
 create mode 100644 dev-environments/grpc/apicast-config.json
 create mode 100644 dev-environments/grpc/docker-compose.yml

diff --git a/dev-environments/grpc/Makefile b/dev-environments/grpc/Makefile
new file mode 100644
index 000000000..74552b571
--- /dev/null
+++ b/dev-environments/grpc/Makefile
@@ -0,0 +1,66 @@
+SHELL = /usr/bin/env bash -o pipefail
+.SHELLFLAGS = -ec
+.DEFAULT_GOAL := gateway
+MKFILE_PATH := $(abspath $(lastword $(MAKEFILE_LIST)))
+WORKDIR := $(patsubst %/,%,$(dir $(MKFILE_PATH)))
+DOCKER ?= $(shell which docker 2> /dev/null || echo "docker")
+
+gateway: ## run gateway configured to access upstream powered with TLS
+	$(DOCKER) compose -f docker-compose.yml run --service-ports gateway
+
+clean:
+	$(DOCKER) compose down --volumes --remove-orphans
+	$(DOCKER) compose -f docker-compose.yml down --volumes --remove-orphans
+	- rm -rf gateway-cert
+	- rm -rf upstream-cert
+	- rm -rf bin
+
+ca:
+	openssl genrsa -out rootCA.key 2048
+	openssl req -batch -new -x509 -nodes -key rootCA.key -sha256 -days 1024 -out rootCA.pem
+
+clientcerts:
+	openssl req -subj '/CN=$(DOMAIN)'  -newkey rsa:4096 -nodes \
+			-sha256 \
+			-days 3650 \
+			-keyout $(DOMAIN).key \
+			-out $(DOMAIN).csr
+	chmod +r $(DOMAIN).key
+	openssl x509 -req -in $(DOMAIN).csr -CA rootCA.pem -CAkey rootCA.key -CAcreateserial -out $(DOMAIN).crt -days 500 -sha256
+
+$(WORKDIR)/gateway-cert:
+	mkdir -p gateway-cert
+
+.PHONY: gateway-certs
+gateway-certs: $(WORKDIR)/gateway-cert
+	$(MAKE) ca -C $(WORKDIR)/gateway-cert -f $(WORKDIR)/Makefile
+	$(MAKE) clientcerts -C $(WORKDIR)/gateway-cert -f $(WORKDIR)/Makefile DOMAIN=gateway.example.com
+
+$(WORKDIR)/upstream-cert:
+	mkdir -p upstream-cert
+
+.PHONY: upstream-certs
+upstream-certs: $(WORKDIR)/upstream-cert
+	$(MAKE) ca -C $(WORKDIR)/upstream-cert -f $(WORKDIR)/Makefile
+	$(MAKE) clientcerts -C $(WORKDIR)/upstream-cert -f $(WORKDIR)/Makefile DOMAIN=upstream.example.com
+	cat $(WORKDIR)/upstream-cert/upstream.example.com.key $(WORKDIR)/upstream-cert/upstream.example.com.crt >$(WORKDIR)/upstream-cert/upstream.example.com.pem
+
+GRPCURL=$(WORKDIR)/bin/grpcurl
+$(GRPCURL):
+	$(call go-install-tool,$(GRPCURL),github.com/fullstorydev/grpcurl/cmd/grpcurl@v1.8.9)
+
+.PHONY: grpcurl
+grpcurl: $(GRPCURL) ## Download grpcurl locally if necessary.
+
+# go-install-tool will 'go install' any package $2 and install it to $1.
+define go-install-tool
+@[ -f $(1) ] || { \
+set -e ;\
+TMP_DIR=$$(mktemp -d) ;\
+cd $$TMP_DIR ;\
+go mod init tmp ;\
+echo "Downloading $(2)" ;\
+GOBIN=$(WORKDIR)/bin go install $(2) ;\
+rm -rf $$TMP_DIR ;\
+}
+endef
diff --git a/dev-environments/grpc/README.md b/dev-environments/grpc/README.md
new file mode 100644
index 000000000..217eda883
--- /dev/null
+++ b/dev-environments/grpc/README.md
@@ -0,0 +1,52 @@
+# APIcast GRPC endpoint
+
+## Create the SSL Certificates
+
+```sh
+make gateway-certs
+```
+
+```sh
+make upstream-certs
+```
+
+## Run the gateway
+
+Running local `apicast-test` docker image
+
+```sh
+make gateway
+```
+
+Running custom apicast image
+
+```sh
+make gateway IMAGE_NAME=quay.io/3scale/apicast:latest
+```
+
+Traffic between the gateway and upstream can be inspected looking at logs from `one.upstream` service
+
+```
+docker compose -p grpc logs -f one.upstream
+```
+
+## Testing
+
+
+Get `grpcurl`
+
+```sh
+make grpcurl
+```
+
+Run request
+
+```sh
+bin/grpcurl -vv -insecure -H "app_id: abc123" -H "app_key: abc123" -authority gateway.example.com 127.0.0.1:8443 main.HelloWorld/Greeting
+```
+
+## Clean env
+
+```sh
+make clean
+```
diff --git a/dev-environments/grpc/apicast-config.json b/dev-environments/grpc/apicast-config.json
new file mode 100644
index 000000000..f296dc74d
--- /dev/null
+++ b/dev-environments/grpc/apicast-config.json
@@ -0,0 +1,35 @@
+{
+  "services": [
+    {
+      "id": "1",
+      "backend_version": "2",
+      "proxy": {
+        "hosts": ["gateway.example.com"],
+        "credentials_location": "headers",
+        "api_backend": "https://one.upstream:443",
+        "backend": {
+          "endpoint": "http://127.0.0.1:8081",
+          "host": "backend"
+        },
+        "policy_chain": [
+          {
+            "name": "apicast.policy.grpc"
+          },
+          {
+            "name": "apicast.policy.apicast"
+          }
+        ],
+        "proxy_rules": [
+          {
+            "http_method": "POST",
+            "pattern": "/",
+            "metric_system_name": "hits",
+            "delta": 1,
+            "parameters": [],
+            "querystring_parameters": {}
+          }
+        ]
+      }
+    }
+  ]
+}
diff --git a/dev-environments/grpc/docker-compose.yml b/dev-environments/grpc/docker-compose.yml
new file mode 100644
index 000000000..6e2e62378
--- /dev/null
+++ b/dev-environments/grpc/docker-compose.yml
@@ -0,0 +1,40 @@
+---
+version: '3.8'
+services:
+  gateway:
+    image: ${IMAGE_NAME:-apicast-test}
+    depends_on:
+    - one.upstream
+    - two.upstream
+    environment:
+      APICAST_HTTPS_PORT: 8443
+      APICAST_HTTPS_CERTIFICATE: /var/run/secrets/apicast/gateway.example.com.crt
+      APICAST_HTTPS_CERTIFICATE_KEY: /var/run/secrets/apicast/gateway.example.com.key
+      THREESCALE_CONFIG_FILE: /tmp/config.json
+      THREESCALE_DEPLOYMENT_ENV: staging
+      APICAST_CONFIGURATION_LOADER: lazy
+      APICAST_WORKERS: 1
+      APICAST_LOG_LEVEL: debug
+      APICAST_CONFIGURATION_CACHE: "0"
+    expose:
+      - "8443"
+      - "8090"
+    ports:
+      - "8443:8443"
+      - "8090:8090"
+    volumes:
+      - ./apicast-config.json:/tmp/config.json
+      - ./gateway-cert:/var/run/secrets/apicast
+  one.upstream:
+    image: alpine/socat:1.7.4.4
+    container_name: one.upstream
+    command: "-v openssl-listen:443,reuseaddr,fork,cert=/etc/pki/upstream.example.com.pem,verify=0,openssl-max-proto-version=TLS1.3 ssl:two.upstream:8005,verify=0"
+    expose:
+      - "443"
+    restart: unless-stopped
+    volumes:
+      - ./upstream-cert/upstream.example.com.pem:/etc/pki/upstream.example.com.pem
+  two.upstream:
+    image: kalmhq/echoserver
+    expose:
+      - "8005"