[client-app] Add initial sync benchmarking script

Summary:
We want to be able to benchmark initial sync, so this diff adds two
scripts. The first, drop-stuff.sh, drops all data from the app and sync
databases that isn't related to account credentials. The second,
benchmark-initial-sync.sh, runs a fixed number of iterations (current 5) that
invokes drop-stuff.sh then opens the app, waits a fixed amount of time
(currently 120 seconds), and then kills the app and measures how many messages
it synced which it prints to the console. This is sufficient for us to start
measuring how quickly we can sync messages. This diff also includes the
sqlite3 amalgamation which drop-stuff.sh requires to function correctly
due to depending on the FTS5 extension which doesn't come built-in on
some platforms.

Test Plan: Run benchmark locally

Reviewers: evan, spang, juan

Reviewed By: juan

Differential Revision: https://phab.nylas.com/D4275

.gitignore

@@ -60,3 +60,6 @@ packages/client-app/spec/isomorphic-core
 .elasticbeanstalk/*
 !.elasticbeanstalk/*.cfg.yml
 !.elasticbeanstalk/*.global.yml
+
+# Sqlite amalgamation for scripts
+scripts/sqlite

scripts/benchmark-initial-sync.sh

@@ -0,0 +1,53 @@
+#!/bin/bash
+
+set -e
+
+function print_help {
+  OUTPUT=$(cat <<- EOM
+
+    A script to benchmark the initial sync performance of Nylas Mail. To use,
+    simply run the script after authing whatever accounts you wish to measure
+    in your development version of Nylas Mail. The benchmarking script will
+    clear all of the data except for your accounts and open and close Nylas
+    Mail several times, printing out the number of messages synced after each
+    iteration.
+  )
+  echo "$OUTPUT"
+}
+
+if [[ $1 == '-h' || $1 == '--help' ]]
+then
+  print_help
+  exit 0
+fi
+
+# Run sudo to prime root privileges
+sudo ls > /dev/null
+
+CWD="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+NYLAS_DIR="$HOME/.nylas-dev"
+EDGEHILL_DB="$NYLAS_DIR/edgehill.db"
+TIME_LIMIT=120
+ITERS=5
+
+for i in `seq 1 $ITERS`
+do
+  bash $CWD/drop-data-except-accounts.sh > /dev/null
+
+  (npm start &> /dev/null &)
+
+  sleep $TIME_LIMIT
+
+  ELECTRON_PID=`ps aux | grep "Electron packages/client-app" | grep -v grep | awk '{print $2}'`
+  sudo kill -9 $ELECTRON_PID
+
+  MESSAGE_COUNT=`sqlite3 $EDGEHILL_DB 'SELECT COUNT(*) FROM Message'`
+  echo "Synced Messages: $MESSAGE_COUNT"
+
+  # Sometimes it takes a while to shutdown
+  while [[ $ELECTRON_PID != '' ]]
+  do
+    sleep 1
+    ELECTRON_PID=`ps aux | grep "Electron packages/client-app" | grep -v grep | awk '{print $2}'`
+  done
+done

scripts/drop-data-except-accounts.sh

@@ -0,0 +1,50 @@
+#!/bin/bash
+
+set -e
+
+CWD="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+NYLAS_DIR="$HOME/.nylas-dev"
+TRUNCATE_TABLES="
+Account 
+AccountPluginMetadata 
+Calendar 
+Category 
+Contact 
+ContactSearch 
+Event 
+EventSearch 
+File 
+Message 
+MessageBody 
+MessagePluginMetadata 
+ProviderSyncbackRequest
+Thread 
+ThreadCategory 
+ThreadContact 
+ThreadCounts 
+ThreadPluginMetadata 
+ThreadSearch"
+SQLITE_DIR=$CWD/sqlite
+SQLITE_BIN=$SQLITE_DIR/sqlite3
+SQLITE_SRC_DIR="$SQLITE_DIR/sqlite-amalgamation-3170000"
+
+# Build the sqlite3 amalgamation if necessary because we need FTS5 support.
+if [[ ! -e "$SQLITE_BIN" ]]
+then
+  mkdir -p $SQLITE_DIR
+  curl -s "https://www.sqlite.org/2017/sqlite-amalgamation-3170000.zip" > "$SQLITE_DIR/sqlite-amalgamation.zip"
+  unzip -o -d $SQLITE_DIR "$SQLITE_DIR/sqlite-amalgamation.zip"
+  clang -DSQLITE_ENABLE_FTS5 "$SQLITE_SRC_DIR/sqlite3.c" "$SQLITE_SRC_DIR/shell.c" -o $SQLITE_BIN
+fi
+
+rm -f $NYLAS_DIR/a-*.sqlite
+
+EDGEHILL_DB=$NYLAS_DIR/edgehill.db
+
+for TABLE in $TRUNCATE_TABLES
+do
+  COMMAND="DELETE FROM $TABLE"
+  $SQLITE_BIN $EDGEHILL_DB "DELETE FROM $TABLE"
+done
+
+$SQLITE_BIN $EDGEHILL_DB 'DELETE FROM JSONBlob WHERE client_id != "NylasID"'