[PATCH v3 2/2] post_pw: Store submitted checks locally as well

[Aaron Conole <aconole@redhat.com>]

Jeremy Kerr reports that our PW checks reporting submitted 43000 API calls
in just a single day.  That is alarmingly unacceptable.  We can store the
URLs we've already submitted and then just skip over any additional
processing at least on the PW side.

This patch does two things to try and mitigate this issue:

1. Store each patch ID and URL in the series DB to show that we reported
   the check.  This means we don't need to poll patchwork for check status

2. Store the last modified time of the reports mailing list.  This means
   we only poll the mailing list when a new email has surely landed.

Signed-off-by: Aaron Conole <aconole@redhat.com>
---
v2: fixed up the Last-Modified grep and storage
v3: Simplified the logic of creating the last-access file

 post_pw.sh       | 35 ++++++++++++++++++++++++++++++++++-
 series_db_lib.sh | 25 +++++++++++++++++++++++++
 2 files changed, 59 insertions(+), 1 deletion(-)

diff --git a/post_pw.sh b/post_pw.sh
index 9163ea1..a8111ff 100755
--- a/post_pw.sh
+++ b/post_pw.sh
@@ -20,6 +20,7 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
+[ -f "$(dirname $0)/series_db_lib.sh" ] && source "$(dirname $0)/series_db_lib.sh" || exit 1
 [ -f "${HOME}/.mail_patchwork_sync.rc" ] && source "${HOME}/.mail_patchwork_sync.rc"
 
 # Patchwork instance to update with new reports from mailing list
@@ -75,6 +76,13 @@ send_post() {
     if [ -z "$context" -o -z "$state" -o -z "$description" -o -z "$patch_id" ]; then
         echo "Skpping \"$link\" due to missing context, state, description," \
              "or patch_id" 1>&2
+        # Just don't want to even bother seeing these "bad" patches as well.
+        add_check_scanned_url "$patch_id" "$target_url"
+        return 0
+    fi
+
+    if check_id_exists "$patch_id" "$target_url" ; then
+        echo "Skipping \"$link\" - already reported." 1>&2
         return 0
     fi
 
@@ -84,6 +92,7 @@ send_post() {
         "$api_url")"
     if [ $? -ne 0 ]; then
         echo "Failed to get proper server response on link ${api_url}" 1>&2
+        # Don't store these as processed in case the server has a temporary issue.
         return 0
     fi
 
@@ -95,6 +104,9 @@ send_post() {
     jq -e "[.[].target_url] | contains([\"$mail_url\"])" >/dev/null
     then
         echo "Report ${target_url} already pushed to patchwork. Skipping." 1>&2
+        # Somehow this was not stored (for example, first time we apply the tracking
+        # feature).  Store it now.
+        add_check_scanned_url "$patch_id" "$target_url"
         return 0
     fi
 
@@ -114,12 +126,31 @@ send_post() {
     if [ $? -ne 0 ]; then
         echo -e "Failed to push retults based on report ${link} to the"\
                 "patchwork instance ${pw_instance} using the following REST"\
-                "API Endpoint ${api_url} with the following data:\n$data\n"
+                "API Endpoint ${api_url} with the following data:\n$data\n" 1>&2
         return 0
     fi
+
+    add_check_scanned_url "$patch_id" "$target_url"
 }
 
+# Collect the date.  NOTE: this needs some accomodate to catch the month change-overs
 year_month="$(date +"%Y-%B")"
+
+# Get the last modified time
+report_last_mod=$(curl --head -A "(pw-ci) pw-post" -sSf "${mail_archive}${year_month}/thread.html" | grep -i Last-Modified)
+
+mailing_list_save_file=$(echo ".post_pw_${mail_archive}${year_month}" | sed -e "s@/@_@g" -e "s@:@_@g" -e "s,@,_,g")
+
+if [ -e "${HOME}/${mailing_list_save_file}" ]; then
+    last_read_date=$(cat "${HOME}/${mailing_list_save_file}")
+    if [ "$last_read_date" -a "$last_read_date" == "$report_last_mod" ]; then
+        echo "Last modified times match.  Skipping list parsing."
+        exit 0
+    fi
+fi
+
+last_read_date="$report_last_mod"
+
 reports="$(curl -A "(pw-ci) pw-post" -sSf "${mail_archive}${year_month}/thread.html" | \
          grep -i 'HREF=' | sed -e 's@[0-9]*<LI><A HREF="@\|@' -e 's@">@\|@')"
 if [ $? -ne 0 ]; then
@@ -132,3 +163,5 @@ echo "$reports" | while IFS='|' read -r blank link title; do
         send_post "${mail_archive}${year_month}/$link"
     fi
 done
+
+echo "$last_read_date" > "${HOME}/${mailing_list_save_file}"
diff --git a/series_db_lib.sh b/series_db_lib.sh
index c5f42e0..0635469 100644
--- a/series_db_lib.sh
+++ b/series_db_lib.sh
@@ -130,6 +130,17 @@ recheck_sync INTEGER
 EOF
         run_db_command "INSERT INTO series_schema_version(id) values (8);"
     fi
+
+    run_db_command "select * from series_schema_version;" | egrep '^9$' > /dev/null 2>&1
+    if [ $? -eq 1 ]; then
+        sqlite3 ${HOME}/.series-db <<EOF
+CREATE TABLE check_id_scanned (
+check_patch_id INTEGER,
+check_url STRING
+)
+EOF
+        run_db_command "INSERT INTO series_schema_version(id) values (9);"
+    fi
 }
 
 function series_db_exists() {
@@ -468,3 +479,17 @@ function set_recheck_request_state() {
 
     echo "UPDATE recheck_requests set recheck_sync=$recheck_state where patchwork_instance=\"$recheck_instance\" and patchwork_project=\"$recheck_project\" and recheck_requested_by=\"$recheck_requested_by\" and recheck_series=\"$recheck_series\";" | series_db_execute
 }
+
+function add_check_scanned_url() {
+    local patch_id="$1"
+    local url="$2"
+
+    echo "INSERT into check_id_scanned (check_patch_id, check_url) values (${patch_id}, \"$url\");" | series_db_execute
+}
+
+function check_id_exists() {
+    local patch_id="$1"
+    local url="$2"
+
+    echo "select * from check_id_scanned where check_patch_id=$patch_id and check_url=\"$url\";" | series_db_execute | grep "$url" >/dev/null 2>&1
+}
-- 
2.41.0