34 lines
922 B
Lua
34 lines
922 B
Lua
-- An affinity mode which makes sure a session is always routed to the same endpoint.
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-- The advantage of this mode is that a user will never lose his session.
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-- The drawback of this mode is that when scaling up a deployment, sessions will not
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-- be rebalanced.
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--
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local balancer_sticky = require("balancer.sticky")
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local util_get_nodes = require("util").get_nodes
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local util_nodemap = require("util.nodemap")
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local setmetatable = setmetatable
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local _M = balancer_sticky:new()
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function _M.new(self, backend)
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local nodes = util_get_nodes(backend.endpoints)
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local hash_salt = backend["name"]
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local o = {
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name = "sticky_persistent",
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instance = util_nodemap:new(nodes, hash_salt)
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}
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setmetatable(o, self)
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self.__index = self
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balancer_sticky.sync(o, backend)
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return o
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end
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function _M.pick_new_upstream(self, failed_upstreams)
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return self.instance:random_except(failed_upstreams)
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end
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return _M
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