Internals - CLI

This page does not address created projects, rather, it is about the API Logic Server system used to create projects. It is for those who want to extend the product or understand how it works, not for those simply using the product.

Created API Logic Project Structure

For reference, projects are created with this structure:

To create using the source code (e.g, from an IDE), using the venv created from above (note: to get the full log, you must must set APILOGICSERVER_DEBUG as in Run Config 1 - Create ApiLogicProject):

(venv) val@Vals-MPB-14 ApiLogicServer % ApiLogicServer create

Welcome to API Logic Server 07.00.01

Project to create [ApiLogicProject]: 
SQLAlchemy Database URI [default = nw.sqlite, ? for help]: 


Creating ApiLogicProject with options:
  --db_url=default = nw.sqlite, ? for help
  --bind_key=
  --project_name=ApiLogicProject   (pwd: /Users/val/dev/servers/install/ApiLogicServer)
  --api_name=api
  --admin_app=True
  --react_admin=False
  --flask_appbuilder=False
  --from_git=
  --run=False
  --host=localhost
  --port=5656
  --swagger_host=localhost
  --not_exposed=ProductDetails_V
  --open_with=
  --use_model=
  --favorites=name description
  --non_favorites=id
  --extended_builder=
  --multi_api=False
  --infer_primary_key=False

ApiLogicServer 07.00.01 Creation Log:
0. Using Sample DB from: sqlite:////Users/val/dev/servers/install/ApiLogicServer/venv/lib/python3.10/site-packages/api_logic_server_cli/database/nw-gold.sqlite
1. Delete dir: /Users/val/dev/servers/install/ApiLogicServer/ApiLogicProject
2. Create Project: /Users/val/dev/servers/install/ApiLogicServer/ApiLogicProject
.. ..Clone from /Users/val/dev/servers/install/ApiLogicServer/venv/lib/python3.10/site-packages/api_logic_server_cli/project_prototype 
.. ..Copy in nw customizations: logic, custom api, readme, tests, admin app
.. ..Sqlite database setup /Users/val/dev/servers/install/ApiLogicServer/ApiLogicProject/database/db.sqlite...
.. .. ..From /Users/val/dev/servers/install/ApiLogicServer/venv/lib/python3.10/site-packages/api_logic_server_cli/database/nw-gold.sqlite
.. .. ..db_uri set to: sqlite:////Users/val/dev/servers/install/ApiLogicServer/ApiLogicProject/database/db.sqlite in <project>/config.py
3. Create/verify database/models.py, then use that to create api/ and ui/ models
 a.  Create Models - create database/models.py, using sqlcodegen
.. .. ..For database:  sqlite:////Users/val/dev/servers/install/ApiLogicServer/ApiLogicProject/database/db.sqlite
.. .. ..Create resource_list - dynamic import database/models.py, inspect 18 classes in <project>/database
.. .. ..Setting cascade delete for sample database database/models.py
 b.  Create api/expose_api_models.py from models
 c.  Create ui/admin/admin.yaml from models
.. .. ..Create ui/admin copy safrs-react-admin to: ApiLogicProject/ui/safrs-react-admin
.. .. ..  ..From /Users/val/dev/servers/install/ApiLogicServer/venv/lib/python3.10/site-packages/api_logic_server_cli/create_from_model/safrs-react-admin-npm-build
.. .. ..Write ApiLogicProject/ui/admin/admin.yaml
 d.  Create ui/basic_web_app -- declined
4. Final project fixup
 b.   Update api_logic_server_run.py with project_name=ApiLogicProject and api_name, host, port
 c.   Fixing api/expose_services - port, host
 d.   Updated customize_api_py with port=5656 and host=localhost
 e.   Updated python_anywhere_wsgi.py with /Users/val/dev/servers/install/ApiLogicServer/ApiLogicProject


==================================================================
ApiLogicProject customizable project created.  Adding Security:
  ..ApiLogicServer add-db --db_url=auth --bind_key=authentication
==================================================================


Creating ApiLogicProject with options:
  --db_url=auth
  --bind_key=authentication
  --project_name=ApiLogicProject   (pwd: /Users/val/dev/servers/install/ApiLogicServer)
  --api_name=api
  --admin_app=True
  --react_admin=False
  --flask_appbuilder=False
  --from_git=
  --run=False
  --host=localhost
  --port=5656
  --swagger_host=localhost
  --not_exposed=ProductDetails_V
  --open_with=
  --use_model=
  --favorites=name description
  --non_favorites=id
  --extended_builder=
  --multi_api=False
  --infer_primary_key=False

ApiLogicServer 07.00.01 Creation Log:
1. Not Deleting Existing Project
2. Using Existing Project
.. ..Adding Database [authentication] to existing project
.. .. ..Copying sqlite database to: database/authentication_db.sqlite
.. .. ..From /Users/val/dev/servers/install/ApiLogicServer/venv/lib/python3.10/site-packages/api_logic_server_cli/database/authentication.sqlite
.. ..Updating config.py file with SQLALCHEMY_DATABASE_URI_AUTHENTICATION...
.. ..Updating database/bind_databases.py with SQLALCHEMY_DATABASE_URI_AUTHENTICATION...
3. Create/verify database/authentication_models.py, then use that to create api/ and ui/ models
 a.  Create Models - create database/authentication_models.py, using sqlcodegen
.. .. ..For database:  sqlite:////Users/val/dev/servers/install/ApiLogicServer/ApiLogicProject/database/authentication_db.sqlite
.. .. ..Setting bind_key = authentication
.. .. ..Create resource_list - dynamic import database/authentication_models.py, inspect 5 classes in <project>/database
 b.  Create api/expose_api_models.py from models
 c.  Create ui/admin/admin.yaml from models
.. .. ..Write ApiLogicProject/ui/admin/authentication_admin.yaml
 d.  Create ui/basic_web_app -- declined
4. Final project fixup
 b.   Update api_logic_server_run.py with project_name=ApiLogicProject and api_name, host, port
 c.   Fixing api/expose_services - port, host
 d.   Updated customize_api_py with port=5656 and host=localhost
 e.   Updated python_anywhere_wsgi.py with /Users/val/dev/servers/install/ApiLogicServer/ApiLogicProject


ApiLogicProject customizable project created.  Next steps:
==========================================================

Run API Logic Server:
  cd ApiLogicProject;  python api_logic_server_run.py

Customize using your IDE:
  code ApiLogicProject  # e.g., open VSCode on created project
  Establish your Python environment - see https://valhuber.github.io/ApiLogicServer/Execute-VSCode-Local/



Security Added - enabled in config.sys


ApiLogicProject customizable project created.  Next steps:
==========================================================

Run API Logic Server:
  cd ApiLogicProject;  python api_logic_server_run.py

Customize using your IDE:
  code ApiLogicProject  # e.g., open VSCode on created project
  Establish your Python environment - see https://valhuber.github.io/ApiLogicServer/Execute-VSCode-Local/


(venv) val@Vals-MPB-14 ApiLogicServer %

Creation Internals

TL/;DR - Deep Copy for default project, create models from schema, create api/ui from models

The basic process of creating a project is a deep copy of api_logic_server_cli/project_prototype, overlaid (as appropriate) from project_prototype_nw.

Much of the logic is the process of creating the models from the database, using an altered variant of sqlacodegen. The created model is then re-opened to create the internal meta data that drives the builders.

The builders use this to create the api and ui.

The ApiLogicServer source code looks like this:

Execution begins at ApiLogicServer/api_logic_server_cli/cli.py. It gathers command line arguments and creates an instance of ProjectRun(Project), which proceeds to ProjectRun.create_project(). Its operation is described in the sections below.

1. Delete Dir

The target project directory is deleted. This does not work on Windows, which requires the directory to not exist.

2. Create Project - copy or `git clone`

The basic project structure is then created, either by a directory copy or git clone. By default, project is created from ApiLogicServer/prototype.

2a. Customize

With limited flexibility, you can provide your own from-git url/path.

NW Examples

For demonstration purposes, the system copies pre-defined logic and services so you can explore them. These are copied from the api_logic_server_cli directory, This is indicated by the following console log entry:

.. ..Append logic/declare_logic.py with pre-defined nw_logic, rpcs

3. Create/verify `database/models.py`, then use that to create api/ and ui/ models

The main driver instantiates create_from_models/model_creation_services.ModelCreationServics(), whose constructor calls create_models. Described below, this provides access to the model, plus verious services to do things like return favorite fields, joins, etc.

The main driver then executes invoke_creators which calls the create_from_models modules to create api and ui models, based on the create_from_models/model_creation_services object. Before writing models.py, import fixes are made in fix_database_models.

Here is the key excerpt of the main driver in api_logic_server_cli/cli.py:

    print(f'3. Create/verify database/models.py, then use that to create api/ and ui/ models')
    model_creation_services = ModelCreationServices(  ...)
    fix_database_models(project_directory, db_types, nw_db_status)
    invoke_creators(model_creation_services)  # MAJOR! creates api/expose_api_models, ui/admin & basic_web_app

3a. Create Models - create `database/models.py`

The essence of the project creator is that, given a database model (description), we can generate APIs and UIs. These models are created in `model_creation_services.py - ModelCreationServices.

The essence of the process is illustrated in the key_module_map at the end of ApiLogicServer/api_logic_cli/cli.py. ModelCreationServices provides the model (resource_list) and various services (e.g, findChildList). A key function is to create the model, which starts in the __init()__ constructor:

It calls sqlacodegen_wrapper.create_models_py to create a string of the models file, which is then written to disk in write_models_py()
- See the code comments for the function: create_models_py
It then calls create_resource_list() (non-trivial)
- It dynamically loads the created models.py
- And builds the model using metadata create by the SAFRS package

For more information, see the comments in create_models_py(), easily reached via the key_module_map in ApiLogicServer/api_logic_cli/cli.py:

def key_module_map():
    """ not called - just index of key code - use this for hover, goto etc 
        ctl-l (^l) for last edit
    """
    import create_from_model.ui_admin_creator as ui_admin_creator
    import create_from_model.api_expose_api_models_creator as api_expose_api_models
    import sqlacodegen_wrapper.sqlacodegen_wrapper as sqlacodegen_wrapper

    api_logic_server()                                          # main driver, calls...
    create_project_with_nw_samples()                            # clone project, overlay nw
    model_creation_services = ModelCreationServices()           # creates resource_list (python db model); ctor calls...
    def and_the_ctor_calls():
        sqlacodegen_wrapper.create_models_py({})                # creates models.py via sqlacodegen
        model_creation_services.create_resource_list()          # creates resource_list via dynamic import of models.py
    invoke_creators(model_creation_services)                    # creates api, ui via create_from_model...
    api_expose_api_models.create()                              # creates api/expose_api_models.py, key input to SAFRS        
    ui_admin_creator.create()                                   # creates ui/admin/admin.yaml from resource_list
    get_abs_db_url()                                            # nw set here, dbname```

Create `resource_list` - dynamic import database/models.py, inspect each class

Called from create_models', this dynamically imports the created (or, rebuild, the existing) models.py, and creates teh resource_list used by the creator modules.

create_resource_model_from_safrs is a complex process due to dynamic import of models.py - failures may manifest here.

create resource list

If option: `use_model`

SQL dialects and bugs can result in failures here. The system therefore enables you to provide your own model, as described in TroubleShooting.

If you elect this option, you should see the following in the console log:

.. ..Copy /Users/val/dev/ApiLogicServer/tests/models.py to /Users/val/dev/servers/sqlserver-types/database/models.py

Extensible generate from models

The models.py file provides resource_list metadata used to create APIs, a basic web app, and a react-admin app (steps 31, 3b and 3c), as shown below:

3b. Create `api/expose_api_models.py` (import / iterate models)

The first creator to be invoked is create_from_model/api_expose_api_models to create expose_api_models.

It uses model_creation_services.resource_list to create create_from_model/model_creation_services#create_models. It is straightforward.

The remaining steps make small updates to the created code to insert database names.

3c. Create `ui/admin app` (import / iterate models)

The main thing in ui_admin_creator is to create a admin.yaml file - an executable description of the pages and content.

3d. Create `ui/basic_web_app` with command: `flask fab create-app`

The system then creates the basic web app. The main thing here is to create the views.py file.

Internals - CLI

Created API Logic Project Structure

Creation Internals

1. Delete Dir

2. Create Project - copy or git clone

2a. Customize

NW Examples

3. Create/verify database/models.py, then use that to create api/ and ui/ models

3a. Create Models - create database/models.py

Create resource_list - dynamic import database/models.py, inspect each class

If option: use_model

Extensible generate from models

3b. Create api/expose_api_models.py (import / iterate models)

3c. Create ui/admin app (import / iterate models)

3d. Create ui/basic_web_app with command: flask fab create-app