Allow setting of connection data via environment arguments

Project.toml

@@ -1,7 +1,7 @@
 name = "SearchLightPostgreSQL"
 uuid = "4327cdd6-4902-11ea-0272-430cea0431bd"
 authors = ["Adrian Salceanu <e@essenciary.com>"]
-version = "2.2"
+version = "2.3"
 
 [deps]
 DataFrames = "a93c6f00-e57d-5684-b7b6-d8193f3e46c0"

src/SearchLightPostgreSQL.jl

@@ -59,15 +59,10 @@ Connects to the database and returns a handle.
 function SearchLight.connect(conn_data::Dict = SearchLight.config.db_config_settings) :: DatabaseHandle
   dns = String[]
 
-  haskey(conn_data, "host")     && push!(dns, string("host=", conn_data["host"]))
-  haskey(conn_data, "hostaddr") && push!(dns, string("hostaddr=", conn_data["hostaddr"]))
-  haskey(conn_data, "port")     && push!(dns, string("port=", conn_data["port"]))
-  haskey(conn_data, "database") && push!(dns, string("dbname=", conn_data["database"]))
-  haskey(conn_data, "username") && push!(dns, string("user=", conn_data["username"]))
-  haskey(conn_data, "password") && push!(dns, string("password=", conn_data["password"]))
-  haskey(conn_data, "passfile") && push!(dns, string("passfile=", conn_data["passfile"]))
-  haskey(conn_data, "connect_timeout") && push!(dns, string("connect_timeout=", conn_data["connect_timeout"]))
-  haskey(conn_data, "client_encoding") && push!(dns, string("client_encoding=", conn_data["client_encoding"]))
+  for key in ["host", "hostaddr", "port", "database", "username", "password", "passfile", "connect_timeout", "client_encoding"]
+    get!(conn_data, key, get(ENV, "SEARCHLIGHT_$(uppercase(key))", nothing))
+    conn_data[key] !== nothing && push!(dns, string("$key=", conn_data[key]))
+  end
 
   push!(CONNECTIONS, LibPQ.Connection(join(dns, " ")))[end]
 end