add log check script

README.md

@@ -104,6 +104,22 @@ crank:
   max_markets_per_tx: 6
 ```
 
+# Log Analysis
+
+To enable quick analysis of the serum crank log file, `scripts/check_logs.sh` can be used to dump the logs of the running crank docker container, which will show a warning if any errors were detected. When no errors have been detected the output looks similar to:
+
+```
+$ ./check_logs.sh 
+found records of 320 cranks, with highest markets in tx 5
+5 most recent crank transactions
+2s6Uxd....bfB9TkPKeV
+4trQ1n....DRaMZ3hcDS
+5A3RT2....MRcVRCSyK4
+23jksg....rdLSVPQ2pd
+3U4jTe....kMuQgZKMvW
+
+```
+
 # License
 
 Based on code from Serum, so for their [click here](https://github.com/project-serum/serum-dex/blob/master/LICENSE)

scripts/check_logs.sh

@@ -0,0 +1,23 @@
+#! /bin/bash
+docker-compose logs > logs
+LOGS=$(grep -i "processed .* instructions for" logs)
+HIGHEST_MARKET_COUNT=$(echo "$LOGS" | awk -F 'markets:' '{print $1}' | awk '{print $NF}'  | sort -u | tail -n 1)
+CRANK_COUNT=$(echo "$LOGS" | awk -F 'markets:' '{print $1}' | wc -l)
+echo "found records of $CRANK_COUNT cranks, with highest markets in tx $HIGHEST_MARKET_COUNT"
+ERRORS=$(echo "$LOGS" | grep -i "error")
+FAILS=$(echo "$LOGS" | grep -i "fail")
+
+if [[ "$ERRORS" != "" ]]; then
+        echo "found possible errors"
+        echo "$ERRORS"
+fi
+
+if [[ "$FAILS" != "" ]]; then
+        echo "found possible failures"
+        echo "$FAILS"
+fi
+
+CRANK_TXS=$(grep -i "crank ran" logs | awk -F 'crank ran' '{print $2}' | awk '{print $1}')
+FIVE_TXS=$(grep -i "crank ran" logs | awk -F 'crank ran' '{print $2}' | awk '{print $1}' | tail -n 5)
+echo "5 most recent crank transactions"
+echo "$FIVE_TXS"