Merge flask-graphql (#37)

* refactor: add flask-graphql as optional feature

* refactor(server): default_format_error to __all__

* chore: rename dir flask-graphql to flask

* chore: add extras require all key

* chore: update gitignore

* fix(sc): move params query check to try-except

* refactor(flask): remove unused backend param

* tests(flask): graphiqlview and graphqlview

* styles: apply black, isort, flake8 formatting

* chore: add all requires to test env

* chore(flask): remove blueprint module

* refactor(flask): remove py27 imports and unused test

* styles: apply black, isort and flake8 formatting

.gitignore

@@ -1,19 +1,203 @@
-*.pyc
-*.pyo
 
+# Created by https://www.gitignore.io/api/python,intellij+all,visualstudiocode
+# Edit at https://www.gitignore.io/?templates=python,intellij+all,visualstudiocode
+
+### Intellij+all ###
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and WebStorm
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/**/usage.statistics.xml
+.idea/**/dictionaries
+.idea/**/shelf
+
+# Generated files
+.idea/**/contentModel.xml
+
+# Sensitive or high-churn files
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+.idea/**/dbnavigator.xml
+
+# Gradle
+.idea/**/gradle.xml
+.idea/**/libraries
+
+# Gradle and Maven with auto-import
+# When using Gradle or Maven with auto-import, you should exclude module files,
+# since they will be recreated, and may cause churn.  Uncomment if using
+# auto-import.
+# .idea/modules.xml
+# .idea/*.iml
+# .idea/modules
+# *.iml
+# *.ipr
+
+# CMake
+cmake-build-*/
+
+# Mongo Explorer plugin
+.idea/**/mongoSettings.xml
+
+# File-based project format
+*.iws
+
+# IntelliJ
+out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Cursive Clojure plugin
+.idea/replstate.xml
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+
+# Editor-based Rest Client
+.idea/httpRequests
+
+# Android studio 3.1+ serialized cache file
+.idea/caches/build_file_checksums.ser
+
+### Intellij+all Patch ###
+# Ignores the whole .idea folder and all .iml files
+# See https://github.com/joeblau/gitignore.io/issues/186 and https://github.com/joeblau/gitignore.io/issues/360
+
+.idea/
+
+# Reason: https://github.com/joeblau/gitignore.io/issues/186#issuecomment-249601023
+
+*.iml
+modules.xml
+.idea/misc.xml
+*.ipr
+
+# Sonarlint plugin
+.idea/sonarlint
+
+### Python ###
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+pip-wheel-metadata/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
 *.egg
-*.egg-info
+MANIFEST
 
-.cache
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
 .coverage
-.idea
-.mypy_cache
-.pytest_cache
-.tox
-.venv
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+.hypothesis/
+.pytest_cache/
+
+# Translations
+*.mo
+*.pot
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+# pyenv
+.python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# celery beat schedule file
+celerybeat-schedule
+
+# SageMath parsed files
+*.sage.py
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# Mr Developer
+.mr.developer.cfg
+.project
+.pydevproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+### VisualStudioCode ###
 .vscode
 
-/build/
-/dist/
+### VisualStudioCode Patch ###
+# Ignore all local history of files
+.history
 
-docs
+# End of https://www.gitignore.io/api/python,intellij+all,visualstudiocode

graphql_server/__init__.py

@@ -30,6 +30,7 @@
     "GraphQLResponse",
     "ServerResponse",
     "format_execution_result",
+    "format_error_default",
 ]
 
 
@@ -230,11 +231,11 @@ def get_response(
     as a parameter.
     """
 
-    if not params.query:
-        raise HttpQueryError(400, "Must provide query string.")
-
     # noinspection PyBroadException
     try:
+        if not params.query:
+            raise HttpQueryError(400, "Must provide query string.")
+
         # Parse document to trigger a new HttpQueryError if allow_only_query is True
         try:
             document = parse(params.query)

graphql_server/flask/__init__.py

@@ -0,0 +1,3 @@
+from .graphqlview import GraphQLView
+
+__all__ = ["GraphQLView"]

graphql_server/flask/graphqlview.py

@@ -0,0 +1,151 @@
+from functools import partial
+
+from flask import Response, request
+from flask.views import View
+from graphql.error import GraphQLError
+from graphql.type.schema import GraphQLSchema
+
+from graphql_server import (
+    HttpQueryError,
+    encode_execution_results,
+    format_error_default,
+    json_encode,
+    load_json_body,
+    run_http_query,
+)
+
+from .render_graphiql import render_graphiql
+
+
+class GraphQLView(View):
+    schema = None
+    executor = None
+    root_value = None
+    pretty = False
+    graphiql = False
+    graphiql_version = None
+    graphiql_template = None
+    graphiql_html_title = None
+    middleware = None
+    batch = False
+
+    methods = ["GET", "POST", "PUT", "DELETE"]
+
+    def __init__(self, **kwargs):
+        super(GraphQLView, self).__init__()
+        for key, value in kwargs.items():
+            if hasattr(self, key):
+                setattr(self, key, value)
+
+        assert isinstance(
+            self.schema, GraphQLSchema
+        ), "A Schema is required to be provided to GraphQLView."
+
+    # noinspection PyUnusedLocal
+    def get_root_value(self):
+        return self.root_value
+
+    def get_context_value(self):
+        return request
+
+    def get_middleware(self):
+        return self.middleware
+
+    def get_executor(self):
+        return self.executor
+
+    def render_graphiql(self, params, result):
+        return render_graphiql(
+            params=params,
+            result=result,
+            graphiql_version=self.graphiql_version,
+            graphiql_template=self.graphiql_template,
+            graphiql_html_title=self.graphiql_html_title,
+        )
+
+    format_error = staticmethod(format_error_default)
+    encode = staticmethod(json_encode)
+
+    def dispatch_request(self):
+        try:
+            request_method = request.method.lower()
+            data = self.parse_body()
+
+            show_graphiql = request_method == "get" and self.should_display_graphiql()
+            catch = show_graphiql
+
+            pretty = self.pretty or show_graphiql or request.args.get("pretty")
+
+            extra_options = {}
+            executor = self.get_executor()
+            if executor:
+                # We only include it optionally since
+                # executor is not a valid argument in all backends
+                extra_options["executor"] = executor
+
+            execution_results, all_params = run_http_query(
+                self.schema,
+                request_method,
+                data,
+                query_data=request.args,
+                batch_enabled=self.batch,
+                catch=catch,
+                # Execute options
+                root_value=self.get_root_value(),
+                context_value=self.get_context_value(),
+                middleware=self.get_middleware(),
+                **extra_options
+            )
+            result, status_code = encode_execution_results(
+                execution_results,
+                is_batch=isinstance(data, list),
+                format_error=self.format_error,
+                encode=partial(self.encode, pretty=pretty),
+            )
+
+            if show_graphiql:
+                return self.render_graphiql(params=all_params[0], result=result)
+
+            return Response(result, status=status_code, content_type="application/json")
+
+        except HttpQueryError as e:
+            parsed_error = GraphQLError(e.message)
+            return Response(
+                self.encode(dict(errors=[self.format_error(parsed_error)])),
+                status=e.status_code,
+                headers=e.headers,
+                content_type="application/json",
+            )
+
+    # Flask
+    def parse_body(self):
+        # We use mimetype here since we don't need the other
+        # information provided by content_type
+        content_type = request.mimetype
+        if content_type == "application/graphql":
+            return {"query": request.data.decode("utf8")}
+
+        elif content_type == "application/json":
+            return load_json_body(request.data.decode("utf8"))
+
+        elif content_type in (
+            "application/x-www-form-urlencoded",
+            "multipart/form-data",
+        ):
+            return request.form
+
+        return {}
+
+    def should_display_graphiql(self):
+        if not self.graphiql or "raw" in request.args:
+            return False
+
+        return self.request_wants_html()
+
+    def request_wants_html(self):
+        best = request.accept_mimetypes.best_match(["application/json", "text/html"])
+        return (
+            best == "text/html"
+            and request.accept_mimetypes[best]
+            > request.accept_mimetypes["application/json"]
+        )