forked from DGNum/liminix
102 lines
2.9 KiB
Fennel
102 lines
2.9 KiB
Fennel
(local { : split : merge : hash : base64url } (require :anoia))
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(local { : mktree : rmtree } (require :anoia.fs))
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(local state-directory (assert (os.getenv "SERVICE_STATE")))
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(mktree state-directory)
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(fn write-value [name value]
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(let [path (.. state-directory "/" name)]
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(with-open [fout (io.open path :w)]
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(when value (fout:write value)))))
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(fn write-value-from-env [name]
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(write-value name (os.getenv (string.upper name))))
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(fn parse-address [str]
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(fn parse-extra [s]
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(let [out {}]
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(each [name val (string.gmatch s ",(.-)=([^,]+)")]
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(tset out name val))
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out))
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(let [(address len preferred valid extra)
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(string.match str "(.-)/(%d+),(%d+),(%d+)(.*)$")]
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(merge {: address : len : preferred : valid} (parse-extra extra))))
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(fn write-addresses [prefix addresses]
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(each [_ a (ipairs (split " " addresses))]
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(let [address (parse-address a)
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suffix (base64url (string.pack "n" (hash a)))
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;; keydir should be a function of all the address
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;; attributes: we want it to change whenever anything changes
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;; so that clients can see which addresses are new without
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;; deep table comparisons
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keydir (..
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prefix
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(-> address.address
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(: :gsub "::$" "")
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(: :gsub ":" "-"))
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"_"
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suffix)]
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(mktree (.. state-directory "/" keydir))
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(each [k v (pairs address)]
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(write-value (.. keydir "/" k) v)))))
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;; we remove state before updating to ensure that consumers don't get
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;; a half-updated snapshot
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(os.remove (.. state-directory "/state"))
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;; remove parsed addresses/prefixes from any previous run
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(rmtree (.. state-directory "/prefix"))
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(rmtree (.. state-directory "/address"))
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(let [wanted
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[
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:addresses
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:aftr
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:cer
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:domains
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:lw406
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:mape
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:mapt
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:ntp_fqdn
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:ntp_ip
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:option_1
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:option_2
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:option_3
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:option_4
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:option_5
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:passthru
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:prefixes
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:ra_addresses
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:ra_dns
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:ra_domains
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:ra_hoplimit
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:ra_mtu
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:ra_reachable
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:ra_retransmit
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:ra_routes
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:rdnss
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:server
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:sip_domain
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:sip_ip
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:sntp_ip
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:sntp_fqdn
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]]
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(each [_ n (ipairs wanted)]
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(write-value-from-env n))
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(match (os.getenv :ADDRESSES) s (write-addresses "address/" s))
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(match (os.getenv :PREFIXES) s (write-addresses "prefix/" s)))
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(let [[ifname state] arg
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ready (match state
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"started" false
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"unbound" false
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"stopped" false
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_ true)]
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(write-value ".lock" (tostring (os.time)))
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(write-value "ifname" ifname)
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(write-value "state" state)
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(os.remove (.. state-directory "/.lock"))
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(when ready
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(with-open [fd (io.open "/proc/self/fd/10" :w)] (fd:write "\n"))))
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