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Sending emails from Google Appengine fails because of missing api proxy

I am trying to send e-mails from a GAE application using this code:
from google.appengine.api.mail import send_mail
send_mail(
"sender#nowhere.com",
["user#example.com"],
"Subject",
"Body",
)
I have configured usage of the apis in app.yaml with:
app_engine_apis: true
And deploy to App Engine is done with gcloud beta app deploy.
However, I get this error:
Traceback (most recent call last):
File "/layers/google.python.pip/pip/lib/python3.9/site-packages/flask/app.py", line 2073, in wsgi_app response = self.full_dispatch_request()
File "/layers/google.python.pip/pip/lib/python3.9/site-packages/flask/app.py", line 1518, in full_dispatch_request rv = self.handle_user_exception(e)
File "/layers/google.python.pip/pip/lib/python3.9/site-packages/flask/app.py", line 1516, in full_dispatch_request rv = self.dispatch_request()
File "/layers/google.python.pip/pip/lib/python3.9/site-packages/flask/app.py", line 1502, in dispatch_request return self.ensure_sync(self.view_functions[rule.endpoint])(**req.view_args)
File "/srv/infrastructure/view_modifiers.py", line 12, in view_method response_val = f(*args, **kwargs)
File "/srv/views/orders.py", line 25, in create_order vm.create_order()
File "/srv/viewmodels/orders/order_viewmodel.py", line 74, in create_order self._send_order_email()
File "/srv/viewmodels/orders/order_viewmodel.py", line 54, in _send_order_email send_mail(
File "/layers/google.python.pip/pip/lib/python3.9/site-packages/google/appengine/api/mail.py", line 401, in send_mail message.send(make_sync_call=make_sync_call)
File "/layers/google.python.pip/pip/lib/python3.9/site-packages/google/appengine/api/mail.py", line 1209, in send make_sync_call('mail', self._API_CALL, message, response)
File "/layers/google.python.pip/pip/lib/python3.9/site-packages/google/appengine/api/apiproxy_stub_map.py", line 96, in MakeSyncCall return stubmap.MakeSyncCall(service, call, request, response)
File "/layers/google.python.pip/pip/lib/python3.9/site-packages/google/appengine/api/apiproxy_stub_map.py", line 348, in MakeSyncCall assert stub, 'No api proxy found for service "%s"' % service AssertionError: No api proxy found for service "mail"
This seems to suggest that even for the default behavior of the mail service, some kind of proxy needs to be configured. However, I cannot find any information about the setup of this proxy.
And, my initial understanding was that setting up a proxy is only needed for unit-testing or local development.

Here is an example that works with fastapi. (answer to anton's comment)
from google.appengine.api import mail
from fastapi.middleware.wsgi import WSGIMiddleware
from google.appengine.api import wrap_wsgi_app
from flask import Flask
app = create_app() # this is just app = FastAPI() and somes middleware but but no relevance here
app_flask = Flask(__name__)
app_flask.wsgi_app = wrap_wsgi_app(app_flask.wsgi_app, use_deferred=True)
def send_approved_mail(sender_address):
# [START send_message]
message = mail.EmailMessage(
sender=sender_address,
subject="Your account has been approved")
message.to = "test#gmail.com"
message.body = """Dear Albert:
Your example.com account has been approved. You can now visit
http://www.example.com/ and sign in using your Google Account to
access new features.
Please let us know if you have any questions.
The example.com Team
"""
message.send()
#app_flask.route("/send_email", methods=['GET'])
def send_email():
send_approved_mail("registred_email#domain.com")
return "message sent"
app.mount("/v1", WSGIMiddleware(app_flask))
here app.yaml
runtime: python39
entrypoint: gunicorn -k uvicorn.workers.UvicornWorker app.main:app
instance_class: F1
app_engine_apis: true
inbound_services:
- mail
- mail_bounce
You will not see flask route on swagger.
and for some reason, i could not sent email with app engine's default service account. I had to register my email ( with same domain) here : https://console.cloud.google.com/appengine/settings/emailsenders?project=your_project

I just tested this and it worked for me (i.e. I received the email I supplied for recipient_email_address in the code below). Note that sender must be a value specified under Email Senders in App Engine settings page
requirements.txt file
Flask
appengine-python-standard>=1.0.0
app.yaml file
runtime: python39
app_engine_apis: true
handlers:
- url: /static
static_dir: static/
- url: /.*
script: auto
main.py
from flask import Flask
from google.appengine.api import wrap_wsgi_app
from google.appengine.api.mail import send_mail
app = Flask(__name__)
app.wsgi_app = wrap_wsgi_app(app.wsgi_app)
#app.route("/")
def sendMail():
send_mail(sender= <authorized_email_sender>,
to= <recipient_email_address>,
subject="Testing Python3 sending mails",
body="""Dear Albert:
Your example.com account has been approved. You can now visit
http://www.example.com/ and sign in using your Google Account to
access new features.
Please let us know if you have any questions.
The example.com Team
""")
return "Mail was sent"

Google AppEngine with Service Account but invalid Credentials

I have tried to get a group settings with group settings API using Google App Engine 1.7.5 with python 2.5 following a simple example here.
this is my app.yaml:
application: {{APP_ID}}
version: 1
runtime: python
api_version: 1
handlers:
- url: /.*
script: main.py
and my main.py is like following:
def main():
application = webapp.WSGIApplication([('/', TestHandler)])
run_wsgi_app(application)
class TestHandler(webapp.RequestHandler):
"""Handles a request for the query page."""
def get(self):
self.response.out.write(Test())
def Test():
credentials = AppAssertionCredentials(scope='https://www.googleapis.com/auth/apps.groups.settings')
http = credentials.authorize(httplib2.Http(memcache))
service = build('groupssettings', 'v1', http=http)
group = service.groups().get(groupUniqueId='{{GROUP_ID}}').execute()
logging.error(group)
if __name__=="__main__":
main()
and this is the stacktrace telling me invalid credentials!
Traceback (most recent call last):
File "C:\Program Files (x86)\Google\google_appengine\google\appengine\ext\webapp\_webapp25.py", line 714, in __call__
handler.get(*groups)
File "D:\Projets\GS\main.py", line 26, in get
self.response.out.write(Test())
File "D:\Projets\GS\main.py", line 41, in Test
group = service.groups().get(groupUniqueId='{{GROUP_ID}}').execute()
File "D:\Projets\GS\oauth2client\util.py", line 132, in positional_wrapper
return wrapped(*args, **kwargs)
File "D:\Projets\GS\apiclient\http.py", line 723, in execute
raise HttpError(resp, content, uri=self.uri)
HttpError: <HttpError 401 when requesting https://www.googleapis.com/groups/v1/groups/{{GROUP_ID}}?alt=json returned "Invalid Credentials">
INFO 2014-11-21 15:51:45,423 dev_appserver.py:3104] "GET / HTTP/1.1" 500 -
INFO 2014-11-21 15:51:45,611 dev_appserver.py:3104] "GET /favicon.ico HTTP/1.1" 404 -
Have anyone got this error before or have an idea of the root cause?

Have you turned on access to the groups API through the developer console for the project? This is a simple step that is often missed by people trying to get APIs going.
Also, I'd recommend using the decorator patterns for OAuth as described here to simplify the reasoning around authorization flows.
In addition, your app.yaml should specify python27 rather than just python. App Engine runs python27.

TemplateNotFound for 404 error page jinja2

I have a Google App Engine app with jinja2, when I force 404 error I have this error:
errors/default_error.html
Traceback (most recent call last):
File "/base/python27_runtime/python27_lib/versions/third_party/webapp2-2.5.1/webapp2.py", line 1536, in __call__
rv = self.handle_exception(request, response, e)
File "/base/python27_runtime/python27_lib/versions/third_party/webapp2-2.5.1/webapp2.py", line 1596, in handle_exception
return handler(request, response, e)
File "/base/data/home/apps/s~sandengine/latest.360189283466406656/main.py", line 28, in handle_404
t = jinja2.get_jinja2(app=app).render_template(template, **c)
File "/base/python27_runtime/python27_lib/versions/third_party/webapp2-2.5.1/webapp2_extras/jinja2.py", line 158, in render_template
return self.environment.get_template(_filename).render(**context)
File "/base/python27_runtime/python27_lib/versions/third_party/jinja2-2.6/jinja2/environment.py", line 719, in get_template
return self._load_template(name, self.make_globals(globals))
File "/base/python27_runtime/python27_lib/versions/third_party/jinja2-2.6/jinja2/environment.py", line 693, in _load_template
template = self.loader.load(self, name, globals)
File "/base/python27_runtime/python27_lib/versions/third_party/jinja2-2.6/jinja2/loaders.py", line 115, in load
source, filename, uptodate = self.get_source(environment, name)
File "/base/python27_runtime/python27_lib/versions/third_party/jinja2-2.6/jinja2/loaders.py", line 180, in get_source
raise TemplateNotFound(template)
TemplateNotFound: errors/default_error.html
Here my yaml file:
application: sandengine
version: latest
runtime: python27
api_version: 1
threadsafe: true
default_expiration: "30d"
skip_files:
- ^(.*/)?app\.yaml
- ^(.*/)?app\.yml
- ^(.*/)?index\.yaml
- ^(.*/)?index\.yml
- ^(.*/)?#.*#
- ^(.*/)?.*~
- ^(.*/)?.*\.py[co]
- ^(.*/)?.*/RCS/.*
- ^(.*/)?\..*
- ^(.*/)?tests$
- ^(.*/)?test$
- ^Makefile
- ^COPYING.LESSER
- ^README.rdoc
- \.gitignore
- ^\.git/.*
- \.*\.lint$
builtins:
- appstats: on #/_ah/stats/
- remote_api: on #/_ah/remote_api/
handlers:
- url: /favicon\.ico
mime_type: image/vnd.microsoft.icon
static_files: static/favicon.ico
upload: static/favicon.ico
- url: /apple-touch-icon\.png
static_files: static/apple-touch-icon.png
upload: static/apple-touch-icon.png
- url: /(robots\.txt|humans\.txt|crossdomain\.xml)
static_files: static/\1
upload: static/(robots\.txt|humans\.txt|crossdomain\.xml)
- url: /img/(.*\.(gif|png|jpg))
static_files: static/img/\1
upload: static/img/(.*\.(gif|png|jpg))
- url: /css
mime_type: text/css
static_dir: static/css
- url: /js
mime_type: text/javascript
static_dir: static/js
- url: /.*
script: main.app
libraries:
- name: jinja2
version: "2.6"
- name: webapp2
version: "2.5.1"
- name: markupsafe
version: "0.15"
error_handlers:
- file: templates/errors/default_error.html
- error_code: over_quota
file: templates/errors/over_quota.html
- error_code: dos_api_denial
file: templates/errors/dos_api_denial.html
- error_code: timeout
file: templates/errors/timeout.html
the code:
def handle_404(request, response, exception):
c = { 'exception': exception.status }
template = config.error_templates[404]
t = jinja2.get_jinja2(app=app).render_template(template, **c)
response.write(t)
response.set_status(exception.status_int)
app = webapp2.WSGIApplication(debug = os.environ['SERVER_SOFTWARE'].startswith('Dev'), config=config.webapp2_config)
app.error_handlers[404] = handle_404
routes.add_routes(app)
The config file:
error_templates = {
404: 'errors/default_error.html',
500: 'errors/default_error.html',
}
Here is the folder structure
Another important thing is that it works without problem in local machine (SDK), but the problem appear in production
You can explore the complete code, because this is an open source code
Thanks in advance for your help

I fixed it by removing the "default_error" on app.yaml
And the error handlers now only have:
error_handlers:
- error_code: over_quota
file: templates/errors/over_quota.html
- error_code: dos_api_denial
file: templates/errors/dos_api_denial.html
- error_code: timeout
file: templates/errors/timeout.html
I improved the code for control 404 errors, adding 500 error, with:
def handle_error(request, response, exception):
c = { 'exception': str(exception) }
status_int = hasattr(exception, 'status_int') and exception.status_int or 500
template = config.error_templates[status_int]
t = jinja2.get_jinja2(app=app).render_template(template, **c)
response.write(t)
response.set_status(status_int)
app = webapp2.WSGIApplication(debug = os.environ['SERVER_SOFTWARE'].startswith('Dev'), config=config.webapp2_config)
app.error_handlers[404] = handle_error
app.error_handlers[500] = handle_error

GAE Simple Request Handler only run once

Good day!
https://developers.google.com/appengine/docs/python/gettingstarted/helloworld
this is the hello world that I'm trying to run.
I can seeing the
Hello, world!
Status: 500
message. however it will be turned to a "HTTP Error 500" after I hit the refresh.
and... it seems that the appengine only shows me the good result once after I re-save either app.yaml or helloworld.py
This is the trace for the good result
Traceback (most recent call last):
File "C:\Program Files\Google\google_appengine\google\appengine\runtime\wsgi.py", line 187, in Handle
handler = _config_handle.add_wsgi_middleware(self._LoadHandler())
File "C:\Program Files\Google\google_appengine\google\appengine\runtime\wsgi.py", line 239, in _LoadHandler
raise ImportError('%s has no attribute %s' % (handler, name))
ImportError: <module 'helloworld' from 'D:\work\[GAE] tests\helloworld\helloworld.pyc'> has no attribute app
INFO 2012-06-23 01:47:28,522 dev_appserver.py:2891] "GET /hello HTTP/1.1" 200 -
ERROR 2012-06-23 01:47:30,040 wsgi.py:189]
and this is the trace for the Error 500
Traceback (most recent call last):
File "C:\Program Files\Google\google_appengine\google\appengine\runtime\wsgi.py", line 187, in Handle
handler = _config_handle.add_wsgi_middleware(self._LoadHandler())
File "C:\Program Files\Google\google_appengine\google\appengine\runtime\wsgi.py", line 239, in _LoadHandler
raise ImportError('%s has no attribute %s' % (handler, name))
ImportError: <module 'helloworld' from 'D:\work\[GAE] tests\helloworld\helloworld.pyc'> has no attribute app
INFO 2012-06-23 01:47:30,127 dev_appserver.py:2891] "GET /hello HTTP/1.1" 500 -
here's my helloworld.py
print 'Content-Type: text/plain'
print ''
print 'Hello, world!'
my main.py. (app is used instead of application)
import webapp2
class hello(webapp2.RequestHandler):
def get(self):
self.response.out.write('normal hello')
app = webapp2.WSGIApplication([
('/', hello),
], debug = True)
and the app.yaml
application: helloworld
version: 1
runtime: python27
api_version: 1
threadsafe: true
handlers:
- url: /favicon\.ico
static_files: favicon.ico
upload: favicon\.ico
- url: /hello
script: helloworld.app
- url: /.*
script: main.app
libraries:
- name: webapp2
version: "2.5.1"
any clue what's causing this?
Regards,

You aren't creating a helloworld.app object in your helloworld.py module.
See the lines
app = webapp2.WSGIApplications([...
in your main.py file? That creates the main.app object that's referenced by the script: main.app handler in your app.yaml.
You're referencing a helloworld.app object a couple of lines above; that object doesn't exist. Python 2.7 in App Engine doesn't support the simple module model -- no WSGI handler, just a simple script -- that's used in the 2.5 "Hello World" demo.
As presveva said, use the 2.7 Getting Started guide for less confusion.

Problems with Jinja2: TemplateNotFound: index.html

I'm trying to build my first GAE app with jinja2. After overcoming a dozen small errors, now I'm stuck with this:
Traceback (most recent call last):
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2\webapp2.py", line 1536, in __call__
rv = self.handle_exception(request, response, e)
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2\webapp2.py", line 1530, in __call__
rv = self.router.dispatch(request, response)
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2\webapp2.py", line 1278, in default_dispatcher
return route.handler_adapter(request, response)
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2\webapp2.py", line 1102, in __call__
return handler.dispatch()
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2\webapp2.py", line 572, in dispatch
return self.handle_exception(e, self.app.debug)
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2\webapp2.py", line 570, in dispatch
return method(*args, **kwargs)
File "C:\Users\CG\Documents\udacity\HiMon\main.py", line 31, in get
template = jinja_environment.get_template('index.html')
File "C:\Program Files (x86)\Google\google_appengine\lib\jinja2\jinja2\environment.py", line 719, in get_template
return self._load_template(name, self.make_globals(globals))
File "C:\Program Files (x86)\Google\google_appengine\lib\jinja2\jinja2\environment.py", line 693, in _load_template
template = self.loader.load(self, name, globals)
File "C:\Program Files (x86)\Google\google_appengine\lib\jinja2\jinja2\loaders.py", line 115, in load
source, filename, uptodate = self.get_source(environment, name)
File "C:\Program Files (x86)\Google\google_appengine\lib\jinja2\jinja2\loaders.py", line 180, in get_source
raise TemplateNotFound(template)
TemplateNotFound: index.html
Here my yaml file:
application: himother
version: 1
runtime: python27
api_version: 1
threadsafe: yes
handlers:
- url: /favicon\.ico
static_files: favicon.ico
upload: favicon\.ico
- url: .*
script: main.app
libraries:
- name: webapp2
version: "2.5.1"
- name: jinja2
version: "2.6"
Here my code:
import os
import webapp2
import jinja2
jinja_environment = jinja2.Environment(autoescape=True,
loader=jinja2.FileSystemLoader(os.path.join(os.path.dirname(__file__), 'templates')))
class MainPage(webapp2.RequestHandler):
def get(self):
template_values = {
'name': 'Serendipo',
'verb': 'extremely happy'
}
template = jinja_environment.get_template('index.html')
self.response.out.write(template.render(template_values))
app = webapp2.WSGIApplication([('/', MainPage)],
debug=True)
Here my .html template:
<!DOCTYPE html>
<html>
<head>
<title>Look Ma, I'm using Jinja!</title>
</head>
<body>
Hi there - I'm {{ name }}, and I {{ verb }} programming!
</body>
</html>
Despite the error message, I have a folder called "templates" and, within it, created the index.html file:
I also have installed jinja2.
Does anyone have any idea of the cause of this error now?

Try to use
loader=jinja2.FileSystemLoader('templates')
instead of
loader=jinja2.FileSystemLoader(os.path.join(os.path.dirname(__file__), 'templates'))
It works for me.

This solved it for me:
mkdir templates
echo "hello world" > templates/index.html

Well, my error was simple and silly.
I have create the file "index.html" the wrong way (here the right way). So, my "index.html" file was indeed a ".text" file (because I just rename it to "index.html" instead of "save as" index.html").
Thanks for the help, guys!

template_dir = os.path.join(os.path.dirname(__file__), 'templates')
jinja_env = jinja2.Environment(loader = jinja2.FileSystemLoader(template_dir),autoescape = True)

Two thoughts based on getting my first GAE effort with Jinja2 to work. First, in your yaml file, you have "-url: ." though I used "-url: /." based on tutorials I saw. However, this may be irrelevant to your issue. Second, I used the guidance on this page for how I established my Jinja2 renderer and had no issue with the template being found in the templates subdirectory of the application directory:
http://webapp-improved.appspot.com/api/webapp2_extras/jinja2.html#module-webapp2_extras.jinja2

I received the same error and tried all answers. Later, I got to know that you first need to configure the environment with the right folder to search the html file and only then jinja2 will be able to locate the file.
Following lines will remove the error:
env = Environment(loader=FileSystemLoader(searchpath='C:\Folder\of\html\file')
template = env.get_template('Name_of_file.html')