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(ns com.github.ivarref.yoltq.impl
(:require [datomic.api :as d]
[clojure.tools.logging :as log]
[clojure.string :as str]
[com.github.ivarref.yoltq.utils :as u]
[com.github.ivarref.yoltq.ext-sys :as ext]
[clojure.edn :as edn]))
(def schema
[#:db{:ident :com.github.ivarref.yoltq/id, :cardinality :db.cardinality/one, :valueType :db.type/uuid, :unique :db.unique/identity}
#:db{:ident :com.github.ivarref.yoltq/ext-id, :cardinality :db.cardinality/one, :valueType :db.type/string, :unique :db.unique/value}
#:db{:ident :com.github.ivarref.yoltq/queue-name, :cardinality :db.cardinality/one, :valueType :db.type/keyword, :index true}
#:db{:ident :com.github.ivarref.yoltq/status, :cardinality :db.cardinality/one, :valueType :db.type/keyword, :index true}
#:db{:ident :com.github.ivarref.yoltq/payload, :cardinality :db.cardinality/one, :valueType :db.type/string}
#:db{:ident :com.github.ivarref.yoltq/opts, :cardinality :db.cardinality/one, :valueType :db.type/string}
#:db{:ident :com.github.ivarref.yoltq/bindings, :cardinality :db.cardinality/one, :valueType :db.type/string}
#:db{:ident :com.github.ivarref.yoltq/tries, :cardinality :db.cardinality/one, :valueType :db.type/long, :noHistory true}
#:db{:ident :com.github.ivarref.yoltq/lock, :cardinality :db.cardinality/one, :valueType :db.type/uuid, :noHistory true}
#:db{:ident :com.github.ivarref.yoltq/init-time, :cardinality :db.cardinality/one, :valueType :db.type/long}
#:db{:ident :com.github.ivarref.yoltq/processing-time, :cardinality :db.cardinality/one, :valueType :db.type/long}
#:db{:ident :com.github.ivarref.yoltq/done-time, :cardinality :db.cardinality/one, :valueType :db.type/long}
#:db{:ident :com.github.ivarref.yoltq/error-time, :cardinality :db.cardinality/one, :valueType :db.type/long}])
(defn pr-str-safe [what x]
(try
(if (= x (edn/read-string (pr-str x)))
(pr-str x)
(throw (ex-info (str "Could not read-string " what) {:input x})))
(catch Exception e
(log/error "could not read-string" what ":" (ex-message e))
(throw e))))
(defn put [{:keys [capture-bindings conn] :as config}
queue-name
payload
opts]
(if-let [q-config (get-in config [:handlers queue-name])]
(let [id (u/squuid)
depends-on (get q-config :depends-on (fn [_] nil))
valid-payload? (get q-config :valid-payload? (fn [_] true))
opts (merge
(when-let [deps (depends-on payload)]
{:depends-on deps})
(or opts {}))
str-bindings (->> (reduce (fn [o k]
(assoc o (symbol k) (deref k)))
{}
(or capture-bindings []))
(pr-str-safe :capture-bindings))]
(when-not (valid-payload? payload)
(log/error "Payload was not valid. Payload was:" payload)
(throw (ex-info (str "Payload was not valid: " payload) {:payload payload})))
(log/debug "queue item" (str id) "for queue" queue-name "is pending status" u/status-init)
(merge
{:com.github.ivarref.yoltq/id id
:com.github.ivarref.yoltq/queue-name queue-name
:com.github.ivarref.yoltq/status u/status-init
:com.github.ivarref.yoltq/payload (pr-str-safe :payload payload)
:com.github.ivarref.yoltq/bindings str-bindings
:com.github.ivarref.yoltq/opts (pr-str-safe :opts opts)
:com.github.ivarref.yoltq/lock (u/random-uuid)
:com.github.ivarref.yoltq/tries 0
:com.github.ivarref.yoltq/init-time (u/now-ms)}
(when-let [[q ext-id] (:depends-on opts)]
(when-not (d/q '[:find ?e .
:in $ ?ext-id
:where
[?e :com.github.ivarref.yoltq/ext-id ?ext-id]]
(d/db conn)
(pr-str-safe :depends-on [q ext-id]))
(throw (ex-info (str ":depends-on not found in database. Queue: " q ", id: " ext-id) opts))))
(when-let [ext-id (:id opts)]
{:com.github.ivarref.yoltq/ext-id (pr-str-safe :id [queue-name ext-id])})))
(do
(log/error "Did not find registered handler for queue" queue-name)
(throw (ex-info (str "Did not find registered handler for queue: " queue-name) {:queue queue-name})))))
(defn depends-on-waiting? [{:keys [conn]}
q-item]
(let [db (d/db conn)]
(when-let [{:com.github.ivarref.yoltq/keys [opts]} (u/get-queue-item db (:id q-item))]
(when-let [[q id :as depends-on] (:depends-on opts)]
(when-not (d/q '[:find ?e .
:in $ ?ext-id
:where
[?e :com.github.ivarref.yoltq/ext-id ?ext-id]
[?e :com.github.ivarref.yoltq/status :done]]
db
(pr-str [q id]))
(log/info "queue item" (str (:id q-item)) "is waiting on" depends-on)
{:depends-on depends-on})))))
(defn take! [{:keys [conn cas-failures hung-log-level tx-spent-time!]
:or {hung-log-level :error}}
{:keys [tx id queue-name was-hung? to-error?] :as queue-item-info}]
(when queue-item-info
(try
(cond to-error?
(log/logp hung-log-level "queue-item" (str id) "was hung and retried too many times. Giving up!")
was-hung?
(log/logp hung-log-level "queue-item" (str id) "was hung, retrying ...")
:else
nil)
(let [start-time (System/nanoTime)
{:keys [db-after]} @(d/transact conn tx)
_ (when tx-spent-time! (tx-spent-time! (- (System/nanoTime) start-time)))
{:com.github.ivarref.yoltq/keys [status] :as q-item} (u/get-queue-item db-after id)]
(log/debug "queue item" (str id) "for queue" queue-name "now has status" status)
q-item)
(catch Throwable t
(let [{:db/keys [error] :as m} (u/db-error-map t)]
(cond
(= :db.error/cas-failed error)
(do
(log/info "take! :db.error/cas-failed for queue item" (str id) "and attribute" (:a m))
(when cas-failures
(swap! cas-failures inc))
nil)
:else
(do
(log/error t "Unexpected failure for queue item" (str id) ":" (ex-message t))
nil)))))))
(defn mark-status! [{:keys [conn tx-spent-time!]}
{:com.github.ivarref.yoltq/keys [id lock tries]}
new-status]
(try
(let [tx [[:db/cas [:com.github.ivarref.yoltq/id id] :com.github.ivarref.yoltq/lock lock (u/random-uuid)]
[: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 u/status-processing new-status]
(if (= new-status u/status-done)
{:db/id [:com.github.ivarref.yoltq/id id] :com.github.ivarref.yoltq/done-time (u/now-ms)}
{:db/id [:com.github.ivarref.yoltq/id id] :com.github.ivarref.yoltq/error-time (u/now-ms)})]
start-time (System/nanoTime)
{:keys [db-after]} @(d/transact conn tx)]
(when tx-spent-time! (tx-spent-time! (- (System/nanoTime) start-time)))
(u/get-queue-item db-after id))
(catch Throwable t
(log/error t "unexpected error in mark-status!: " (ex-message t))
nil)))
(defn fmt [id queue-name new-status tries spent-ns]
(str/join " " ["queue-item" (str id)
"for queue" queue-name
"now has status" new-status
"after" tries (if (= 1 tries)
"try"
"tries")
"in" (format "%.1f" (double (/ spent-ns 1e6))) "ms"]))
(defn execute! [{:keys [handlers mark-status-fn! start-execute-time collect-spent-time!]
:or {mark-status-fn! mark-status!}
:as cfg}
{:com.github.ivarref.yoltq/keys [status id queue-name payload] :as queue-item}]
(when queue-item
(if (= :error status)
(assoc queue-item :failed? true)
(if-let [queue (get handlers queue-name)]
(let [{:keys [f allow-cas-failure?]} queue]
(log/debug "queue item" (str id) "for queue" queue-name "is now processing")
(let [{:keys [retval exception]}
(try
(swap! start-execute-time assoc (Thread/currentThread) [(ext/now-ms) id queue-name])
(let [v (f payload)]
{:retval v})
(catch Throwable t
{:exception t})
(finally
(swap! start-execute-time dissoc (Thread/currentThread))))
{:db/keys [error] :as m} (u/db-error-map exception)]
(cond
(and (some? exception)
allow-cas-failure?
(= :db.error/cas-failed error)
(or (true? allow-cas-failure?)
(allow-cas-failure? (:a m))))
(when-let [q-item (mark-status-fn! cfg queue-item u/status-done)]
(let [{:com.github.ivarref.yoltq/keys [init-time done-time tries]} q-item]
(log/info (fmt id queue-name u/status-done tries (- done-time init-time)))
(when collect-spent-time! (collect-spent-time! (- (u/now-ms) init-time)))
(assoc q-item :retval retval :success? true :allow-cas-failure? true)))
(some? exception)
(when-let [q-item (mark-status-fn! cfg queue-item u/status-error)]
(let [{:com.github.ivarref.yoltq/keys [init-time error-time tries]} q-item
level (if (>= tries 3) :error :warn)]
(log/logp level exception (fmt id queue-name u/status-error tries (- error-time init-time)))
(log/logp level exception "error message was:" (str \" (ex-message exception) \") "for queue-item" (str id))
(log/logp level exception "ex-data was:" (ex-data exception) "for queue-item" (str id))
(when collect-spent-time! (collect-spent-time! (- (u/now-ms) init-time)))
(assoc q-item :exception exception)))
:else
(when-let [q-item (mark-status-fn! cfg queue-item u/status-done)]
(let [{:com.github.ivarref.yoltq/keys [init-time done-time tries]} q-item]
(log/info (fmt id queue-name u/status-done tries (- done-time init-time)))
(when collect-spent-time! (collect-spent-time! (- (u/now-ms) init-time)))
(assoc q-item :retval retval :success? true))))))
(do
(log/error "no handler for queue" queue-name)
nil)))))
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