Improve implementation around config (#1122)

* refactor config

* fix saas config

* feat(config): scanmodule for each server in config.toml

* feat(config): enable to specify containersOnly in config.toml

* add new keys of config.toml to discover.go

* fix summary output, logging

config/gocvedictconf.go

@@ -0,0 +1,53 @@
+package config
+
+import (
+	"os"
+	"path/filepath"
+)
+
+// GoCveDictConf is go-cve-dictionary config
+type GoCveDictConf struct {
+	// DB type of CVE dictionary (sqlite3, mysql, postgres or redis)
+	Type string
+
+	// http://cve-dictionary.com:1323 or DB connection string
+	URL string `json:"-"`
+
+	// /path/to/cve.sqlite3
+	SQLite3Path string `json:"-"`
+}
+
+func (cnf *GoCveDictConf) setDefault() {
+	if cnf.Type == "" {
+		cnf.Type = "sqlite3"
+	}
+	if cnf.URL == "" && cnf.SQLite3Path == "" {
+		wd, _ := os.Getwd()
+		cnf.SQLite3Path = filepath.Join(wd, "cve.sqlite3")
+	}
+}
+
+const cveDBType = "CVEDB_TYPE"
+const cveDBURL = "CVEDB_URL"
+const cveDBPATH = "CVEDB_SQLITE3_PATH"
+
+// Init set options with the following priority.
+// 1. Environment variable
+// 2. config.toml
+func (cnf *GoCveDictConf) Init() {
+	if os.Getenv(cveDBType) != "" {
+		cnf.Type = os.Getenv(cveDBType)
+	}
+	if os.Getenv(cveDBURL) != "" {
+		cnf.URL = os.Getenv(cveDBURL)
+	}
+	if os.Getenv(cveDBPATH) != "" {
+		cnf.SQLite3Path = os.Getenv(cveDBPATH)
+	}
+	cnf.setDefault()
+}
+
+// IsFetchViaHTTP returns wether fetch via http
+func (cnf *GoCveDictConf) IsFetchViaHTTP() bool {
+	return Conf.CveDict.Type == "http"
+}