From 4262b13969efc3531dc3529c5e611fb19e5a4f59 Mon Sep 17 00:00:00 2001
From: zevav <zev@averba.ch>
Date: Wed, 25 Oct 2017 17:05:11 -0400
Subject: [PATCH] added some more steps for the blog post

---
 .gitignore                                   |   1 +
 .idea/babysitter_bot.iml                     |  14 --
 .idea/inspectionProfiles/Project_Default.xml |  43 -----
 .idea/misc.xml                               |   7 -
 .idea/modules.xml                            |   8 -
 .idea/vcs.xml                                |   6 -
 .idea/workspace.xml                          | 185 -------------------
 basic_sitter_bot.py                          |  59 ++++++
 basic_sitter_bot_with_pickle.py              |  74 ++++++++
 sitter_bot.py                                |  12 +-
 10 files changed, 140 insertions(+), 269 deletions(-)
 delete mode 100644 .idea/babysitter_bot.iml
 delete mode 100644 .idea/inspectionProfiles/Project_Default.xml
 delete mode 100644 .idea/misc.xml
 delete mode 100644 .idea/modules.xml
 delete mode 100644 .idea/vcs.xml
 delete mode 100644 .idea/workspace.xml
 create mode 100644 basic_sitter_bot.py
 create mode 100644 basic_sitter_bot_with_pickle.py

diff --git a/.gitignore b/.gitignore
index ea14333..a9d4ffa 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 .*sw*
 .DS_Store
 *~
+.idea/
diff --git a/.idea/babysitter_bot.iml b/.idea/babysitter_bot.iml
deleted file mode 100644
index 46ce774..0000000
--- a/.idea/babysitter_bot.iml
+++ /dev/null
@@ -1,14 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<module type="PYTHON_MODULE" version="4">
-  <component name="NewModuleRootManager">
-    <content url="file://$MODULE_DIR$" />
-    <orderEntry type="jdk" jdkName="Python 3.6.0 virtualenv at ~/.pyenv/versions/babysitter_bot" jdkType="Python SDK" />
-    <orderEntry type="sourceFolder" forTests="false" />
-  </component>
-  <component name="TemplatesService">
-    <option name="TEMPLATE_CONFIGURATION" value="Jinja2" />
-  </component>
-  <component name="TestRunnerService">
-    <option name="PROJECT_TEST_RUNNER" value="Unittests" />
-  </component>
-</module>
\ No newline at end of file
diff --git a/.idea/inspectionProfiles/Project_Default.xml b/.idea/inspectionProfiles/Project_Default.xml
deleted file mode 100644
index 99e770f..0000000
--- a/.idea/inspectionProfiles/Project_Default.xml
+++ /dev/null
@@ -1,43 +0,0 @@
-<component name="InspectionProjectProfileManager">
-  <profile version="1.0">
-    <option name="myName" value="Project Default" />
-    <inspection_tool class="PyPackageRequirementsInspection" enabled="true" level="WARNING" enabled_by_default="true">
-      <option name="ignoredPackages">
-        <value>
-          <list size="18">
-            <item index="0" class="java.lang.String" itemvalue="Werkzeug" />
-            <item index="1" class="java.lang.String" itemvalue="wsgiref" />
-            <item index="2" class="java.lang.String" itemvalue="MarkupSafe" />
-            <item index="3" class="java.lang.String" itemvalue="requests" />
-            <item index="4" class="java.lang.String" itemvalue="itsdangerous" />
-            <item index="5" class="java.lang.String" itemvalue="Jinja2" />
-            <item index="6" class="java.lang.String" itemvalue="click" />
-            <item index="7" class="java.lang.String" itemvalue="Flask" />
-            <item index="8" class="java.lang.String" itemvalue="plaid-python" />
-            <item index="9" class="java.lang.String" itemvalue="asn1crypto" />
-            <item index="10" class="java.lang.String" itemvalue="pyOpenSSL" />
-            <item index="11" class="java.lang.String" itemvalue="cffi" />
-            <item index="12" class="java.lang.String" itemvalue="cryptography" />
-            <item index="13" class="java.lang.String" itemvalue="packaging" />
-            <item index="14" class="java.lang.String" itemvalue="pycparser" />
-            <item index="15" class="java.lang.String" itemvalue="pyparsing" />
-            <item index="16" class="java.lang.String" itemvalue="twilio" />
-            <item index="17" class="java.lang.String" itemvalue="idna" />
-          </list>
-        </value>
-      </option>
-    </inspection_tool>
-    <inspection_tool class="PyUnresolvedReferencesInspection" enabled="true" level="WARNING" enabled_by_default="true">
-      <option name="ignoredIdentifiers">
-        <list>
-          <option value="plaid.Client" />
-        </list>
-      </option>
-    </inspection_tool>
-    <inspection_tool class="SpellCheckingInspection" enabled="false" level="TYPO" enabled_by_default="false">
-      <option name="processCode" value="true" />
-      <option name="processLiterals" value="true" />
-      <option name="processComments" value="true" />
-    </inspection_tool>
-  </profile>
-</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
deleted file mode 100644
index 5413da0..0000000
--- a/.idea/misc.xml
+++ /dev/null
@@ -1,7 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="PreferredVcsStorage">
-    <preferredVcsName>ApexVCS</preferredVcsName>
-  </component>
-  <component name="ProjectRootManager" version="2" project-jdk-name="Python 3.6.0 virtualenv at ~/.pyenv/versions/babysitter_bot" project-jdk-type="Python SDK" />
-</project>
\ No newline at end of file
diff --git a/.idea/modules.xml b/.idea/modules.xml
deleted file mode 100644
index f9bf3df..0000000
--- a/.idea/modules.xml
+++ /dev/null
@@ -1,8 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="ProjectModuleManager">
-    <modules>
-      <module fileurl="file://$PROJECT_DIR$/.idea/babysitter_bot.iml" filepath="$PROJECT_DIR$/.idea/babysitter_bot.iml" />
-    </modules>
-  </component>
-</project>
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
deleted file mode 100644
index 94a25f7..0000000
--- a/.idea/vcs.xml
+++ /dev/null
@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="VcsDirectoryMappings">
-    <mapping directory="$PROJECT_DIR$" vcs="Git" />
-  </component>
-</project>
\ No newline at end of file
diff --git a/.idea/workspace.xml b/.idea/workspace.xml
deleted file mode 100644
index 6c904a5..0000000
--- a/.idea/workspace.xml
+++ /dev/null
@@ -1,185 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="ChangeListManager">
-    <list default="true" id="d62c162e-b344-4d79-986f-e8c09fbec6ca" name="Default" comment="">
-      <change type="MODIFICATION" beforePath="$PROJECT_DIR$/requirements.txt" afterPath="$PROJECT_DIR$/requirements.txt" />
-      <change type="MODIFICATION" beforePath="$PROJECT_DIR$/sitter_bot.py" afterPath="$PROJECT_DIR$/sitter_bot.py" />
-    </list>
-    <option name="EXCLUDED_CONVERTED_TO_IGNORED" value="true" />
-    <option name="TRACKING_ENABLED" value="true" />
-    <option name="SHOW_DIALOG" value="false" />
-    <option name="HIGHLIGHT_CONFLICTS" value="true" />
-    <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
-    <option name="LAST_RESOLUTION" value="IGNORE" />
-  </component>
-  <component name="FileColors">
-    <fileColor scope="Non-Project Files (Material Default)" color="2E3C43" />
-    <fileColor scope="Non-Project Files (Material Darker)" color="323232" />
-    <fileColor scope="Non-Project Files (Material Lighter)" color="eae8e8" />
-    <fileColor scope="Non-Project Files (Material Palenight)" color="2f2e43" />
-  </component>
-  <component name="FileEditorManager">
-    <leaf>
-      <file leaf-file-name="sitter_bot.py" pinned="false" current-in-tab="true">
-        <entry file="file://$PROJECT_DIR$/sitter_bot.py">
-          <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="189">
-              <caret line="9" column="80" lean-forward="false" selection-start-line="6" selection-start-column="0" selection-end-line="9" selection-end-column="80" />
-              <folding>
-                <element signature="e#0#15#0" expanded="true" />
-              </folding>
-            </state>
-          </provider>
-        </entry>
-      </file>
-    </leaf>
-  </component>
-  <component name="Git.Settings">
-    <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" />
-  </component>
-  <component name="IdeDocumentHistory">
-    <option name="CHANGED_PATHS">
-      <list>
-        <option value="$PROJECT_DIR$/sitter_bot.py" />
-      </list>
-    </option>
-  </component>
-  <component name="JsBuildToolGruntFileManager" detection-done="true" sorting="DEFINITION_ORDER" />
-  <component name="JsBuildToolPackageJson" detection-done="true" sorting="DEFINITION_ORDER" />
-  <component name="JsGulpfileManager">
-    <detection-done>true</detection-done>
-    <sorting>DEFINITION_ORDER</sorting>
-  </component>
-  <component name="ProjectFrameBounds" extendedState="6">
-    <option name="x" value="90" />
-    <option name="width" value="986" />
-    <option name="height" value="1920" />
-  </component>
-  <component name="ProjectView">
-    <navigator currentView="ProjectPane" proportions="" version="1">
-      <flattenPackages />
-      <showMembers />
-      <showModules />
-      <showLibraryContents />
-      <hideEmptyPackages />
-      <abbreviatePackageNames />
-      <autoscrollToSource />
-      <autoscrollFromSource />
-      <sortByType />
-      <manualOrder />
-      <foldersAlwaysOnTop value="true" />
-    </navigator>
-    <panes>
-      <pane id="Scope" />
-      <pane id="ProjectPane">
-        <subPane>
-          <expand>
-            <path>
-              <item name="babysitter_bot" type="b2602c69:ProjectViewProjectNode" />
-              <item name="babysitter_bot" type="462c0819:PsiDirectoryNode" />
-            </path>
-          </expand>
-          <select />
-        </subPane>
-      </pane>
-      <pane id="Scratches" />
-    </panes>
-  </component>
-  <component name="PropertiesComponent">
-    <property name="settings.editor.selected.configurable" value="com.jetbrains.python.configuration.PyActiveSdkModuleConfigurable" />
-    <property name="WebServerToolWindowFactoryState" value="false" />
-    <property name="last_opened_file_path" value="$USER_HOME$/.pyenv/versions/babysitter_bot/bin/python3.6" />
-  </component>
-  <component name="RunDashboard">
-    <option name="ruleStates">
-      <list>
-        <RuleState>
-          <option name="name" value="ConfigurationTypeDashboardGroupingRule" />
-        </RuleState>
-        <RuleState>
-          <option name="name" value="StatusDashboardGroupingRule" />
-        </RuleState>
-      </list>
-    </option>
-  </component>
-  <component name="RunManager" selected="Python.babysitter_bot">
-    <configuration name="babysitter_bot" type="PythonConfigurationType" factoryName="Python" singleton="true">
-      <option name="INTERPRETER_OPTIONS" value="" />
-      <option name="PARENT_ENVS" value="true" />
-      <envs>
-        <env name="PYTHONUNBUFFERED" value="1" />
-      </envs>
-      <option name="SDK_HOME" value="" />
-      <option name="WORKING_DIRECTORY" value="" />
-      <option name="IS_MODULE_SDK" value="false" />
-      <option name="ADD_CONTENT_ROOTS" value="true" />
-      <option name="ADD_SOURCE_ROOTS" value="true" />
-      <module name="babysitter_bot" />
-      <EXTENSION ID="PythonCoverageRunConfigurationExtension" enabled="false" sample_coverage="true" runner="coverage.py" />
-      <option name="SCRIPT_NAME" value="$PROJECT_DIR$/sitter_bot.py" />
-      <option name="PARAMETERS" value="" />
-      <option name="SHOW_COMMAND_LINE" value="false" />
-      <option name="EMULATE_TERMINAL" value="false" />
-    </configuration>
-  </component>
-  <component name="ShelveChangesManager" show_recycled="false">
-    <option name="remove_strategy" value="false" />
-  </component>
-  <component name="TaskManager">
-    <task active="true" id="Default" summary="Default task">
-      <changelist id="d62c162e-b344-4d79-986f-e8c09fbec6ca" name="Default" comment="" />
-      <created>1508950836856</created>
-      <option name="number" value="Default" />
-      <option name="presentableId" value="Default" />
-      <updated>1508950836856</updated>
-    </task>
-    <servers />
-  </component>
-  <component name="ToolWindowManager">
-    <frame x="0" y="0" width="1080" height="1920" extended-state="6" />
-    <editor active="true" />
-    <layout>
-      <window_info id="TODO" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="6" side_tool="false" content_ui="tabs" />
-      <window_info id="Event Log" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="7" side_tool="true" content_ui="tabs" />
-      <window_info id="Run" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="2" side_tool="false" content_ui="tabs" />
-      <window_info id="Version Control" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="7" side_tool="false" content_ui="tabs" />
-      <window_info id="Python Console" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="7" side_tool="false" content_ui="tabs" />
-      <window_info id="Terminal" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="7" side_tool="false" content_ui="tabs" />
-      <window_info id="Project" active="false" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.14537036" sideWeight="0.5" order="0" side_tool="false" content_ui="combo" />
-      <window_info id="Database" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="3" side_tool="false" content_ui="tabs" />
-      <window_info id="Find" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.32958803" sideWeight="0.5" order="1" side_tool="false" content_ui="tabs" />
-      <window_info id="Structure" active="false" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.25" sideWeight="0.5" order="1" side_tool="false" content_ui="tabs" />
-      <window_info id="Debug" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.4" sideWeight="0.5" order="3" side_tool="false" content_ui="tabs" />
-      <window_info id="Favorites" active="false" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="2" side_tool="true" content_ui="tabs" />
-      <window_info id="Data View" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="3" side_tool="false" content_ui="tabs" />
-      <window_info id="Cvs" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.25" sideWeight="0.5" order="4" side_tool="false" content_ui="tabs" />
-      <window_info id="Message" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="0" side_tool="false" content_ui="tabs" />
-      <window_info id="Commander" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.4" sideWeight="0.5" order="0" side_tool="false" content_ui="tabs" />
-      <window_info id="Inspection" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.4" sideWeight="0.5" order="5" side_tool="false" content_ui="tabs" />
-      <window_info id="Hierarchy" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.25" sideWeight="0.5" order="2" side_tool="false" content_ui="combo" />
-      <window_info id="Ant Build" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.25" sideWeight="0.5" order="1" side_tool="false" content_ui="tabs" />
-    </layout>
-  </component>
-  <component name="TypeScriptGeneratedFilesManager">
-    <option name="version" value="1" />
-  </component>
-  <component name="VcsContentAnnotationSettings">
-    <option name="myLimit" value="2678400000" />
-  </component>
-  <component name="XDebuggerManager">
-    <breakpoint-manager />
-    <watches-manager />
-  </component>
-  <component name="editorHistoryManager">
-    <entry file="file://$PROJECT_DIR$/sitter_bot.py">
-      <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="189">
-          <caret line="9" column="80" lean-forward="false" selection-start-line="6" selection-start-column="0" selection-end-line="9" selection-end-column="80" />
-          <folding>
-            <element signature="e#0#15#0" expanded="true" />
-          </folding>
-        </state>
-      </provider>
-    </entry>
-  </component>
-</project>
\ No newline at end of file
diff --git a/basic_sitter_bot.py b/basic_sitter_bot.py
new file mode 100644
index 0000000..cbccca5
--- /dev/null
+++ b/basic_sitter_bot.py
@@ -0,0 +1,59 @@
+import os
+from typing import Tuple
+
+from flask import Flask, request
+from twilio.rest import Client as TwilioClient
+from twilio.twiml.messaging_response import MessagingResponse
+
+twilio_client = TwilioClient(os.getenv('TWILIO_SID'), os.getenv('TWILIO_TOKEN'))
+
+app = Flask(__name__)
+app.config.from_object(__name__)
+
+sitters = {}
+
+@app.route('/bot', methods=['POST'])
+def bot():
+    from_ = request.values.get('From')
+    body = request.values.get('Body').lower()
+    response = 'I wasn\'t sure what to do with your input. '
+
+    if has_phone_num(body):
+
+        try:
+            sitter_name, sitter_num = add_sitter(body)
+        except (AssertionError, ValueError):
+            response = 'Sorry, did you mean to add a sitter?  Please try again.'
+        else:
+            response = f'Okay, I added {sitter_name.title()} to sitters, with phone # {sitter_num}.  '
+            print(sitters)
+
+    resp = MessagingResponse()
+    resp.message(response)
+    return str(resp)
+
+
+def has_phone_num(string):
+    return len([char for char in string if char.isnumeric()]) == 10
+
+
+def add_sitter(body: str) -> Tuple[str, str]:
+    name, *num_parts = body.split(' ')
+
+    num_only = ''.join(char
+                       for num in num_parts
+                       for char in num if char.isnumeric())
+
+    lowercase_name = name.lower()
+    sitter = sitters.get(lowercase_name)
+
+    assert len(num_only) == 10
+
+    sitters[lowercase_name] = f'+1{num_only}'
+
+    return name, sitters[lowercase_name]
+
+
+if __name__ == '__main__':
+    app.run(debug=True, port=8000)
+
diff --git a/basic_sitter_bot_with_pickle.py b/basic_sitter_bot_with_pickle.py
new file mode 100644
index 0000000..6564945
--- /dev/null
+++ b/basic_sitter_bot_with_pickle.py
@@ -0,0 +1,74 @@
+import os
+import pickle
+from typing import Tuple
+
+from flask import Flask, request
+from twilio.rest import Client as TwilioClient
+from twilio.twiml.messaging_response import MessagingResponse
+
+MY_CELL = os.getenv('MY_CELL')
+BOOKER_NUM = os.getenv('MY_TWILIO_NUM')
+
+twilio_client = TwilioClient(os.getenv('TWILIO_SID'), os.getenv('TWILIO_TOKEN'))
+
+app = Flask(__name__)
+app.config.from_object(__name__)
+
+sitters = {}
+if os.path.exists('sitters.p'):
+    sitters = pickle.load(open('sitters.p', 'rb'))
+
+@app.route('/bot', methods=['POST'])
+def bot():
+    from_ = request.values.get('From')
+    body = request.values.get('Body').lower()
+    response = 'I wasn\'t sure what to do with your input. '
+
+    if has_phone_num(body):
+
+        try:
+            sitter_name, sitter_num = add_sitter(body)
+        except (AssertionError, ValueError):
+            response = 'Sorry, did you mean to add a sitter?  Please try again.'
+        else:
+            response = f'Okay, I added {sitter_name.title()} to sitters, with phone # {sitter_num}.  '
+            print(sitters)
+
+    resp = MessagingResponse()
+    resp.message(response)
+    return str(resp)
+
+
+def has_phone_num(string):
+    return len([char for char in string if char.isnumeric()]) == 10
+
+
+def add_sitter(body: str) -> Tuple[str, str]:
+    name, *num_parts = body.split(' ')
+
+    num_only = ''.join(char
+                       for num in num_parts
+                       for char in num if char.isnumeric())
+
+    lowercase_name = name.lower()
+    sitter = sitters.get(lowercase_name)
+
+    assert len(num_only) == 10
+
+    sitters[lowercase_name] = f'+1{num_only}'
+    persist_sitters()
+
+    return name, sitters[lowercase_name]
+
+
+def persist_sitters():
+    pickle.dump(sitters, open('sitters.p', 'wb'))
+
+
+if __name__ == '__main__':
+    if sitters:
+        sitter_list = 'Your sitters are ' + ' and '.join(
+            f'{sitter_name.title()}' for sitter_name in sitters) + '.'
+        twilio_client.api.account.messages.create(to=MY_CELL, from_=BOOKER_NUM, body=sitter_list)
+    app.run(debug=True, port=8000)
+
diff --git a/sitter_bot.py b/sitter_bot.py
index a1bfee3..6efc7b2 100644
--- a/sitter_bot.py
+++ b/sitter_bot.py
@@ -60,7 +60,7 @@ def bot() -> str:
         if not sitters:
             response = f'You don\'t have any sitters yet. {help_add}.'
         else:
-            sitter_list = 'Your sitters are ' + ', '.join(
+            sitter_list = 'Your sitters are ' + ' and '.join(
                 f'{sitter_name.title()}' for sitter_name in sitters) + '.'
             response = f'{sitter_list} {help_text}'
 
@@ -100,7 +100,7 @@ def bot() -> str:
 
 
 def has_phone_num(string):
-    return len([char for char in string if char.isnumeric()]) >= 10
+    return len([char for char in string if char.isnumeric()]) == 10
 
 
 def syndicate_and_book(session_start: datetime.datetime, session_end: datetime.datetime) -> Optional[str]:
@@ -111,13 +111,13 @@ def syndicate_and_book(session_start: datetime.datetime, session_end: datetime.d
     pass
 
 
-def book_sitter(in_message: str) -> Optional[str]:
-    session_start, session_end = parse_sitter_request(in_message)
+def book_sitter(body: str) -> Optional[str]:
+    session_start, session_end = parse_sitter_request(body)
     syndicate_and_book(session_start, session_end)
 
 
-def add_sitter(in_message: str) -> Tuple[str, str]:
-    name, *num_parts = in_message.split(' ')
+def add_sitter(body: str) -> Tuple[str, str]:
+    name, *num_parts = body.split(' ')
 
     num_only = ''.join(char
                        for num in num_parts