Add Gunicorn example

gunicorn/Makefile

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+ARCH_LIBDIR ?= /lib/$(shell $(CC) -dumpmachine)
+
+ifeq ($(DEBUG),1)
+GRAMINE_LOG_LEVEL = debug
+else
+GRAMINE_LOG_LEVEL = error
+endif
+
+.PHONY: all
+all: gunicorn.manifest
+ifeq ($(SGX),1)
+all: gunicorn.manifest.sgx gunicorn.sig
+endif
+
+gunicorn.manifest: gunicorn.manifest.template
+	gramine-manifest \
+		-Dlog_level=$(GRAMINE_LOG_LEVEL) \
+		-Darch_libdir=$(ARCH_LIBDIR) \
+		-Dentrypoint=$(realpath $(shell sh -c "command -v gunicorn")) \
+		-Dpython_exe_path=$(realpath $(shell sh -c "command -v python3")) \
+		$< >$@
+
+# Make on Ubuntu <= 20.04 doesn't support "Rules with Grouped Targets" (`&:`)
+gunicorn.manifest.sgx gunicorn.sig: sgx_sign
+	@:
+
+.INTERMEDIATE: sgx_sign
+sgx_sign: gunicorn.manifest
+	gramine-sgx-sign \
+		--manifest $< \
+		--output $<.sgx
+
+.PHONY: clean
+clean:
+	$(RM) -rf *.token *.sig *.manifest *.manifest.sgx __pycache__
+
+.PHONY: distclean
+distclean: clean

gunicorn/README.md

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+# Gunicorn example
+
+This directory contains an example for running Gunicorn in Gramine, including the Makefile and a
+template for generating the manifest. Gunicorn is a webserver to deploy Flask application in
+Python. Although, Flask comes with an internal webserver, this is widely considered to be not
+viable for production. Common practice in production is to put Flask behind a real webserver that
+communicates via the WSGI protocol. A common choice for that webserver is Gunicorn. Users can
+protect their confidentiality and integrity of the Python based ML APIs and models using Gramine
+for a more secure production deployment using Gunicorn. For more documentation, refer to
+https://docs.gunicorn.org/en/stable/.
+
+# Generating the manifest
+
+## Installing prerequisites
+
+Please run the following command to install Gunicorn and its dependencies on Ubuntu 22.04:
+```
+sudo apt-get install python3 python3-flask gunicorn
+```
+
+## Building for Linux
+
+Run `make` (non-debug) or `make DEBUG=1` (debug) in the directory.
+
+## Building for SGX
+
+Run `make SGX=1` (non-debug) or `make SGX=1 DEBUG=1` (debug) in the directory.
+
+# Running Gunicorn with Gramine
+
+Here's an example of running Gunicorn under Gramine:
+
+Without SGX:
+```
+gramine-direct gunicorn
+```
+
+With SGX:
+```
+gramine-sgx gunicorn
+```

gunicorn/gunicorn.manifest.template

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+loader.entrypoint = "file:{{ gramine.libos }}"
+libos.entrypoint = "{{ entrypoint }}"
+
+loader.log_level = "{{ log_level }}"
+
+loader.argv = ["gunicorn", "--timeout", "600", "main:app"]
+
+sys.enable_sigterm_injection = true
+
+loader.env.LD_LIBRARY_PATH = "/lib:{{ arch_libdir }}:/usr/{{ arch_libdir }}"
+
+fs.mounts = [
+  { path = "{{ arch_libdir }}", uri = "file:{{ arch_libdir }}" },
+  { path = "{{ entrypoint }}", uri = "file:{{ entrypoint }}" },
+  { path = "/lib", uri = "file:{{ gramine.runtimedir() }}" },
+{% for path in python.get_sys_path(python_exe_path) %}
+  { path = "{{ path }}", uri = "file:{{ path }}" },
+{% endfor %}
+  { path = "/usr/bin/python3", uri = "file:/usr/bin/python3" },
+  { path = "/usr/{{ arch_libdir }}", uri = "file:/usr/{{ arch_libdir }}" },
+  { type = "tmpfs", path = "/tmp" },
+]
+
+sgx.edmm_enable = {{ 'true' if env.get('EDMM', '0') == '1' else 'false' }}
+sgx.enclave_size = "512M"
+sgx.max_threads = 64
+
+sgx.trusted_files = [
+  "file:{{ arch_libdir }}/",
+  "file:{{ entrypoint }}",
+  "file:{{ gramine.libos }}",
+  "file:{{ gramine.runtimedir() }}/",
+  "file:main.py",
+{% for path in python.get_sys_path(python_exe_path) %}
+  "file:{{ path }}{{ '/' if path.is_dir() else '' }}",
+{% endfor %}
+  "file:/usr/bin/python3",
+  "file:/usr/{{ arch_libdir }}/",
+]
+

gunicorn/main.py

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+from flask import Flask, jsonify, request
+
+app = Flask(__name__)
+
+@app.route('/hello', methods=['GET'])
+def helloworld():
+    if(request.method == 'GET'):
+        data = {"data": "Hello World"}
+        return jsonify(data)
+
+if __name__ == '__main__':
+    app.run(debug=True)