refact shell script

* fix wget save to a wrong file name with a same name file
* beautify log format
* print asn on log
* modify/add DEBUG, SKIP_DATA_PREPARATION environment variables

common.sh

@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+
+[[ $DEBUG == true ]] && set -x
+
+log_info(){
+    >&2 echo "INFO>" $@
+}
+
+get_asn(){
+	local CONF_FILE=$1
+	unset PATTERN
+	unset COUNTRY
+	source $CONF_FILE
+	grep -P "${COUNTRY}\$" asnames.txt | 
+	grep -Pi "$PATTERN" | 
+	awk '{print $1}' | 
+	while read ASN; do 
+		ASN=${ASN#AS}
+		if grep '\.' <(echo $ASN) > /dev/null; then 
+			ASN_HIGH=${ASN%.*}
+			ASN_LOW=${ASN#*.}
+			ASN=$((ASN_HIGH * 65536 + ASN_LOW))
+		fi
+		echo $ASN
+	done
+}
+
+prepare_data(){
+	wget http://bgp.potaroo.net/as1221/asnames.txt -O asnames.txt
+	wget http://archive.routeviews.org/dnszones/rib.bz2 -O rib.bz2
+	log_info "runing bgpdump ..."
+	docker run -it --rm -v `pwd`:/bgpdump -w /bgpdump gaoyifan/bgpdump bgpdump -m -O rib.txt rib.bz2
+	log_info "done"
+}