another take on metrics

spiffworkflow-backend/app_version.json

@@ -0,0 +1 @@
+{"version": "1.0.3"}

spiffworkflow-backend/poetry.lock

@@ -1258,6 +1258,29 @@ python-versions = ">=3.7"
 "ruamel.yaml" = ">=0.15"
 tomli = {version = ">=1.1.0", markers = "python_version < \"3.11\""}
 
+[[package]]
+name = "prometheus-client"
+version = "0.16.0"
+description = "Python client for the Prometheus monitoring system."
+category = "main"
+optional = false
+python-versions = ">=3.6"
+
+[package.extras]
+twisted = ["twisted"]
+
+[[package]]
+name = "prometheus-flask-exporter"
+version = "0.22.3"
+description = "Prometheus metrics exporter for Flask"
+category = "main"
+optional = false
+python-versions = "*"
+
+[package.dependencies]
+flask = "*"
+prometheus-client = "*"
+
 [[package]]
 name = "prompt-toolkit"
 version = "3.0.31"
@@ -1895,7 +1918,7 @@ lxml = "*"
 type = "git"
 url = "https://github.com/sartography/SpiffWorkflow"
 reference = "main"
-resolved_reference = "f162aac43af3af18d1a55186aeccea154fb8b05d"
+resolved_reference = "3c3345c85dd7f3b7112ad04aaa6487abbd2e9414"
 
 [[package]]
 name = "SQLAlchemy"
@@ -2274,7 +2297,7 @@ testing = ["flake8 (<5)", "func-timeout", "jaraco.functools", "jaraco.itertools"
 [metadata]
 lock-version = "1.1"
 python-versions = ">=3.9,<3.12"
-content-hash = "b9ea32912509637f1378d060771de7548d93953aa3db12d6a48098f7dc15205f"
+content-hash = "d851a6df0cc4fbb77d658455deb8bc3cb9c82fa7789ea581f20b373a96ae6078"
 
 [metadata.files]
 alabaster = [
@@ -3056,6 +3079,14 @@ pre-commit-hooks = [
     {file = "pre_commit_hooks-4.3.0-py2.py3-none-any.whl", hash = "sha256:9ccaf7c98794659d345080ee1ea0256a55ae059675045eebdbbc17c0be8c7e4b"},
     {file = "pre_commit_hooks-4.3.0.tar.gz", hash = "sha256:fda598a4c834d030727e6a615722718b47510f4bed72df4c949f95ba9f5aaf88"},
 ]
+prometheus-client = [
+    {file = "prometheus_client-0.16.0-py3-none-any.whl", hash = "sha256:0836af6eb2c8f4fed712b2f279f6c0a8bbab29f9f4aa15276b91c7cb0d1616ab"},
+    {file = "prometheus_client-0.16.0.tar.gz", hash = "sha256:a03e35b359f14dd1630898543e2120addfdeacd1a6069c1367ae90fd93ad3f48"},
+]
+prometheus-flask-exporter = [
+    {file = "prometheus_flask_exporter-0.22.3-py3-none-any.whl", hash = "sha256:16e6a3a7ce0089fc7c78a6956cdf28c184c3ac518e2b46a2a8e410b68d3a84a3"},
+    {file = "prometheus_flask_exporter-0.22.3.tar.gz", hash = "sha256:32b152aeb7970cbf04616627fc5bf20d82b0918e54c54f80dc8aaef3349fd333"},
+]
 prompt-toolkit = [
     {file = "prompt_toolkit-3.0.31-py3-none-any.whl", hash = "sha256:9696f386133df0fc8ca5af4895afe5d78f5fcfe5258111c2a79a1c3e41ffa96d"},
     {file = "prompt_toolkit-3.0.31.tar.gz", hash = "sha256:9ada952c9d1787f52ff6d5f3484d0b4df8952787c087edf6a1f7c2cb1ea88148"},

spiffworkflow-backend/pyproject.toml

@@ -75,6 +75,7 @@ flask-jwt-extended = "^4.4.4"
 pylint = "^2.15.10"
 flask-simple-crypt = "^0.3.3"
 cryptography = "^39.0.2"
+prometheus-flask-exporter = "^0.22.3"
 
 
 [tool.poetry.dev-dependencies]

spiffworkflow-backend/src/spiffworkflow_backend/__init__.py

@@ -4,10 +4,12 @@ import faulthandler
 import os
 import sys
 from typing import Any
+from prometheus_flask_exporter import PrometheusMetrics
 
 import connexion  # type: ignore
 import flask.app
 import flask.json
+import json
 import sqlalchemy
 from apscheduler.schedulers.background import BackgroundScheduler  # type: ignore
 from apscheduler.schedulers.base import BaseScheduler  # type: ignore
@@ -125,6 +127,16 @@ def create_app() -> flask.app.Flask:
     connexion_app = connexion.FlaskApp(__name__, server_args={"instance_path": os.environ.get("FLASK_INSTANCE_PATH")})
     app = connexion_app.app
     app.config["CONNEXION_APP"] = connexion_app
+    metrics = PrometheusMetrics(app)
+    info = metrics.info('dynamic_info', 'Something dynamic')
+    info.set(42.1)
+    # metrics.register_endpoint('/metricss')
+
+    app.config["PROMETHEUS_METRICS"] = metrics
+    app_version_data = {}
+    with open("app_version.json", 'r') as f:
+        app_version_data = json.load(f)
+    metrics.info('app_info', 'Application info', version='1.0.3')
     app.config["SESSION_TYPE"] = "filesystem"
 
     setup_config(app)

spiffworkflow-backend/src/spiffworkflow_backend/services/authorization_service.py

@@ -323,6 +323,8 @@ class AuthorizationService:
             api_view_function
             and api_view_function.__name__.startswith("login")
             or api_view_function.__name__.startswith("logout")
+            or api_view_function.__name__.startswith("prom")
+            or api_view_function.__name__.startswith("metric")
             or api_view_function.__name__.startswith("console_ui_")
             or api_view_function.__name__ in authentication_exclusion_list
             or api_view_function.__name__ in swagger_functions