Add dryrun mode to contacts.

cmd/contacts/contacts.go

@@ -5,17 +5,22 @@ import (
 	"database/sql"
 	"flag"
 	"fmt"
-	"net/mail"
 	"time"
 	"unicode/utf8"
 	"xinu.tv/types"
 
 	"github.com/golang/glog"
 	_ "github.com/lib/pq"
+
+	"xinu.tv/std/net/mail"
 )
 
-var all = flag.Bool("all", false,
-	"extract addresses from all messages. Default is to only extract from unprocessed messages.")
+var (
+	all = flag.Bool("all", false,
+		"extract addresses from all messages. Default is to only extract from unprocessed messages.")
+
+	dryrun = flag.Bool("dryrun", false, "don't write to the DB.")
+)
 
 type contact struct {
 	hash string
@@ -24,6 +29,12 @@ type contact struct {
 }
 
 func insertAddresses(db *sql.DB, batch int, contactCh chan *contact, errc chan error) {
+	if *dryrun {
+		for _ = range contactCh {
+		}
+		errc <- nil
+		return
+	}
 	var (
 		txn  *sql.Tx
 		stmt *sql.Stmt