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William Bell
Azure stateful webapp
Commits
929230f4
Commit
929230f4
authored
2 years ago
by
William Bell
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Adding updated database configuration functions
parent
85a01a0f
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src/app.py
+43
-7
43 additions, 7 deletions
src/app.py
with
43 additions
and
7 deletions
src/app.py
+
43
−
7
View file @
929230f4
...
...
@@ -4,28 +4,61 @@ from flask import Flask
from
models
import
db
def
database_uri
()
->
s
tr
:
def
database_uri
()
->
s
qlalchemy
.
engine
.
url
.
URL
:
"""
A function to build the database connection string, using environment
variable settings.
"""
# If the connection string has been given, use it.
url
=
os
.
environ
.
get
(
"
DB_CONNECTION_STRING
"
,
default
=
""
)
if
len
(
url
)
!=
0
:
return
url
# Create a new DB connection string from components.
url
=
sqlalchemy
.
engine
.
url
.
URL
.
create
(
drivername
=
"
mariadb+mariadbconnector
"
,
drivername
=
os
.
environ
.
get
(
"
DB_DRIVER
"
,
default
=
"
mariadb+mariadbconnector
"
)
,
username
=
os
.
environ
.
get
(
"
DB_USER
"
,
default
=
"
none
"
),
password
=
os
.
environ
.
get
(
"
DB_PASSWORD
"
,
default
=
"
none
"
),
host
=
os
.
environ
.
get
(
"
DB_SERVER
"
,
default
=
"
127.0.0.1
"
),
port
=
os
.
environ
.
get
(
"
DB_PORT
"
,
default
=
"
3306
"
),
database
=
os
.
environ
.
get
(
"
DB_NAME
"
,
default
=
"
mydb
"
))
return
str
(
url
)
return
url
def
database_connection_args
()
->
dict
:
"""
A function to build the connection arguments, which are associated
with an SSL connection.
"""
connection_args
=
{}
# Check for a SSL certificate.
ssl_cert_file
=
os
.
environ
.
get
(
"
DB_SSL_CERT
"
,
default
=
None
)
if
ssl_cert_file
is
not
None
:
connection_args
.
update
({
"
ssl_ca
"
:
ssl_cert_file
})
# Check if SSL should be enabled.
ssl_str
=
os
.
environ
.
get
(
"
DB_SSL
"
,
default
=
None
)
if
ssl_str
is
not
None
:
if
ssl_str
.
strip
().
lower
()
==
"
true
"
:
connection_args
.
update
({
"
ssl
"
:
"
1
"
})
return
connection_args
def
create_app
(
test_config
:
dict
=
{}):
"""
A factory function to create a Flask app.
"""
app
=
Flask
(
__name__
)
app
.
config
[
'
SQLALCHEMY_DATABASE_URI
'
]
=
database_uri
()
connection_args
=
{}
ssl_cert
=
os
.
environ
.
get
(
"
DB_SSL_CERT
"
,
default
=
None
)
if
ssl_cert
is
not
None
:
connection_args
[
"
ssl_ca
"
]
=
ssl_cert
connection_args
=
database_connection_args
()
if
len
(
connection_args
)
>
0
:
app
.
config
[
'
SQLALCHEMY_ENGINE_OPTIONS
'
]
=
{
"
connect_args
"
:
connection_args
}
app
.
config
[
'
SQLALCHEMY_TRACK_MODIFICATIONS
'
]
=
False
...
...
@@ -40,6 +73,9 @@ def create_app(test_config:dict = {}):
if
__name__
==
'
__main__
'
:
"""
A test program to create one running Flask app.
"""
app
=
create_app
()
svc_host
=
os
.
environ
.
get
(
"
SVC_HOST
"
,
default
=
None
)
app
.
run
(
debug
=
True
,
host
=
svc_host
)
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