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(ns com.github.ivarref.yoltq.utils
(:require [datomic.api :as d]
[clojure.edn :as edn]
[com.github.ivarref.yoltq.ext-sys :as ext]
[clojure.tools.logging :as log])
(:refer-clojure :exclude [random-uuid])
(:import (datomic Connection)
(java.time Duration)))
(def status-init :init)
(def status-processing :processing)
(def status-done :done)
(def status-error :error)
(defn duration->millis [m]
(reduce-kv (fn [o k v]
(if (instance? Duration v)
(assoc o k (.toMillis v))
(assoc o k v)))
{}
m))
(defn squuid []
(ext/squuid))
(defn random-uuid []
(ext/random-uuid))
(defn now-ms []
(ext/now-ms))
(defn root-cause [e]
(if-let [root (ex-cause e)]
(root-cause root)
e))
(defn db-error-map [^Throwable t]
(loop [e t]
(cond (nil? e) nil
(and (map? (ex-data e))
(contains? (ex-data e) :db/error))
(ex-data e)
:else
(recur (ex-cause e)))))
(defn get-queue-item [db id]
(-> (d/pull db '[:*] [:com.github.ivarref.yoltq/id id])
(dissoc :db/id)
(update :com.github.ivarref.yoltq/payload edn/read-string)
(update :com.github.ivarref.yoltq/opts (fn [s] (or (when s (edn/read-string s)) {})))
(update :com.github.ivarref.yoltq/bindings
(fn [s]
(when s
(->> s
(edn/read-string)
(reduce-kv (fn [o k v]
(assoc o (resolve k) v))
{})))))))
(defn prepare-processing [db id queue-name old-lock old-status]
(let [new-lock (random-uuid)]
{:id id
:lock new-lock
:queue-name queue-name
:bindings (get (get-queue-item db id) :com.github.ivarref.yoltq/bindings {})
:tx [[:db/cas [:com.github.ivarref.yoltq/id id] :com.github.ivarref.yoltq/lock old-lock new-lock]
[:db/cas [:com.github.ivarref.yoltq/id id] :com.github.ivarref.yoltq/status old-status status-processing]
{:db/id [:com.github.ivarref.yoltq/id id] :com.github.ivarref.yoltq/processing-time (now-ms)}]}))
(defn get-init [{:keys [conn db init-backoff-time] :as cfg} queue-name]
(assert (instance? Connection conn) (str "Expected conn to be of type datomic.Connection. Was: "
(str (if (nil? conn) "nil" conn))
"\nConfig was: " (str cfg)))
(let [db (or db (d/db conn))]
(if-let [ids (->> (d/q '[:find ?id ?lock
:in $ ?queue-name ?backoff
:where
[?e :com.github.ivarref.yoltq/status :init]
[?e :com.github.ivarref.yoltq/queue-name ?queue-name]
[?e :com.github.ivarref.yoltq/init-time ?init-time]
[(>= ?backoff ?init-time)]
[?e :com.github.ivarref.yoltq/id ?id]
[?e :com.github.ivarref.yoltq/lock ?lock]]
db
queue-name
(- (now-ms) init-backoff-time))
(not-empty))]
(let [[id old-lock] (rand-nth (into [] ids))]
(prepare-processing db id queue-name old-lock :init))
(log/debug "no new-items in :init status for queue" queue-name))))
(defn get-error [{:keys [conn db error-backoff-time max-retries] :as cfg} queue-name]
(assert (instance? Connection conn) (str "Expected conn to be of type datomic.Connection. Was: "
(str (if (nil? conn) "nil" conn))
"\nConfig was: " (str cfg)))
(let [db (or db (d/db conn))
max-retries (get-in cfg [:handlers queue-name :max-retries] max-retries)]
(when-let [ids (->> (d/q '[:find ?id ?lock
:in $ ?queue-name ?backoff ?max-tries
:where
[?e :com.github.ivarref.yoltq/status :error]
[?e :com.github.ivarref.yoltq/queue-name ?queue-name]
[?e :com.github.ivarref.yoltq/error-time ?time]
[(>= ?backoff ?time)]
[?e :com.github.ivarref.yoltq/tries ?tries]
[(> ?max-tries ?tries)]
[?e :com.github.ivarref.yoltq/id ?id]
[?e :com.github.ivarref.yoltq/lock ?lock]]
db
queue-name
(- (now-ms) error-backoff-time)
(inc max-retries))
(not-empty))]
(let [[id old-lock] (rand-nth (into [] ids))]
(prepare-processing db id queue-name old-lock :error)))))
(defn get-hung [{:keys [conn db now hung-backoff-time max-retries] :as cfg} queue-name]
(assert (instance? Connection conn) (str "Expected conn to be of type datomic.Connection. Was: "
(str (if (nil? conn) "nil" conn))
"\nConfig was: " (str cfg)))
(let [now (or now (now-ms))
max-retries (get-in cfg [:handlers queue-name :max-retries] max-retries)
db (or db (d/db conn))]
(when-let [ids (->> (d/q '[:find ?id ?lock ?tries
:in $ ?qname ?backoff
:where
[?e :com.github.ivarref.yoltq/status :processing]
[?e :com.github.ivarref.yoltq/queue-name ?qname]
[?e :com.github.ivarref.yoltq/processing-time ?time]
[(>= ?backoff ?time)]
[?e :com.github.ivarref.yoltq/tries ?tries]
[?e :com.github.ivarref.yoltq/id ?id]
[?e :com.github.ivarref.yoltq/lock ?lock]]
db
queue-name
(- now hung-backoff-time))
(not-empty))]
(let [new-lock (random-uuid)
[id old-lock tries _t] (rand-nth (into [] ids))
to-error? (>= tries max-retries)]
{:id id
:lock new-lock
:queue-name queue-name
:was-hung? true
:to-error? to-error?
:bindings (get (get-queue-item db id) :com.github.ivarref.yoltq/bindings {})
:tx (if (not to-error?)
[[:db/cas [:com.github.ivarref.yoltq/id id] :com.github.ivarref.yoltq/lock old-lock new-lock]
[:db/cas [:com.github.ivarref.yoltq/id id] :com.github.ivarref.yoltq/tries tries (inc tries)]
{:db/id [:com.github.ivarref.yoltq/id id] :com.github.ivarref.yoltq/error-time now}]
[[:db/cas [:com.github.ivarref.yoltq/id id] :com.github.ivarref.yoltq/lock old-lock new-lock]
[:db/cas [:com.github.ivarref.yoltq/id id] :com.github.ivarref.yoltq/tries tries (inc tries)]
[:db/cas [:com.github.ivarref.yoltq/id id] :com.github.ivarref.yoltq/status status-processing status-error]
{:db/id [:com.github.ivarref.yoltq/id id] :com.github.ivarref.yoltq/error-time now}])}))))
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