From f31762a075f391c8ba2a8363f8c7d9b5a9713962 Mon Sep 17 00:00:00 2001
From: Kim Alvefur <zash@zash.se>
Date: Fri, 21 Jan 2022 17:56:20 +0100
Subject: net.resolvers.chain: A resolver for combining other resolvers
Say if you wanted to try both _xmpp and _xmpps services
---
net/resolvers/chain.lua | 38 ++++++++++++++++++++++++++++++++++++++
1 file changed, 38 insertions(+)
create mode 100644 net/resolvers/chain.lua
(limited to 'net')
diff --git a/net/resolvers/chain.lua b/net/resolvers/chain.lua
new file mode 100644
index 00000000..b3135e67
--- /dev/null
+++ b/net/resolvers/chain.lua
@@ -0,0 +1,38 @@
+
+local methods = {};
+local resolver_mt = { __index = methods };
+
+-- Find the next target to connect to, and
+-- pass it to cb()
+function methods:next(cb)
+ if self.resolvers then
+ if not self.resolver then
+ if #self.resolvers == 0 then
+ cb(nil);
+ return;
+ end
+ local next_resolver = table.remove(self.resolvers, 1);
+ self.resolver = next_resolver;
+ end
+ self.resolver:next(function (...)
+ if self.resolver then
+ self.last_error = self.resolver.last_error;
+ end
+ if ... == nil then
+ self.resolver = nil;
+ self:next(cb);
+ else
+ cb(...);
+ end
+ end);
+ return;
+ end
+end
+
+local function new(resolvers)
+ return setmetatable({ resolvers = resolvers }, resolver_mt);
+end
+
+return {
+ new = new;
+};
--
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