From 03cda643ad0e248902e18b1073240d15b0345d33 Mon Sep 17 00:00:00 2001
From: Evgeny Zinoviev <me@ch1p.io>
Date: Wed, 3 Mar 2021 02:16:38 +0300
Subject: jobd-master: support pause()/continue()

---
 src/jobd-master.js      | 69 +++++++++++++++++++++++++++++++++++++++++++++++++
 src/lib/workers-list.js | 55 ++++++++++++++++++++++++++++++++++++---
 2 files changed, 121 insertions(+), 3 deletions(-)

diff --git a/src/jobd-master.js b/src/jobd-master.js
index 8ba0288..5839b1a 100755
--- a/src/jobd-master.js
+++ b/src/jobd-master.js
@@ -104,6 +104,8 @@ function initRequestHandler() {
     requestHandler.set('register-worker', onRegisterWorker)
     requestHandler.set('status', onStatus)
     requestHandler.set('run-manual', onRunManual)
+    requestHandler.set('pause', onPause)
+    requestHandler.set('continue', onContinue)
 }
 
 /**
@@ -221,6 +223,73 @@ async function onRunManual(data, requestNo, connection) {
     )
 }
 
+/**
+ * @param {object} data
+ * @param {number} requestNo
+ * @param {Connection} connection
+ */
+function onPause(data, requestNo, connection) {
+    let targets
+    if ((targets = validateInputTargets(data, requestNo, connection)) === false)
+        return
+
+    workers.pauseTargets(targets)
+    connection.send(
+        new ResponseMessage(requestNo)
+            .setData('ok')
+    )
+}
+
+/**
+ * @param {object} data
+ * @param {number} requestNo
+ * @param {Connection} connection
+ */
+function onContinue(data, requestNo, connection) {
+    let targets
+    if ((targets = validateInputTargets(data, requestNo, connection)) === false)
+        return
+
+    workers.continueTargets(targets)
+    connection.send(
+        new ResponseMessage(requestNo)
+            .setData('ok')
+    )
+}
+
+
+/**
+ * @private
+ * @param data
+ * @param requestNo
+ * @param connection
+ * @return {null|boolean|string[]}
+ */
+function validateInputTargets(data, requestNo, connection) {
+    // null means all targets
+    let targets = null
+
+    if (data.targets !== undefined) {
+        targets = data.targets
+
+        // validate data
+        try {
+            validateTargetsListFormat(targets)
+
+            // note: we don't check target names here
+            // as in jobd
+        } catch (e) {
+            connection.send(
+                new ResponseMessage(requestNo)
+                    .setError(e.message)
+            )
+            return false
+        }
+    }
+
+    return targets
+}
+
 
 function usage() {
     let s = `${process.argv[1]} OPTIONS
diff --git a/src/lib/workers-list.js b/src/lib/workers-list.js
index 41b13e2..82e660d 100644
--- a/src/lib/workers-list.js
+++ b/src/lib/workers-list.js
@@ -67,15 +67,26 @@ class WorkersList {
     poke(targets) {
         this.logger.debug('poke:', targets)
 
-        if (!Array.isArray(targets))
-            throw new Error('targets must be Array')
-
         for (let t of targets)
             this.targetsToPoke[t] = true
 
         this._pokeWorkers()
     }
 
+    /**
+     * @param targets
+     * @return {object[]}
+     */
+    getWorkersByTargets(targets) {
+        const found = []
+        for (const worker of this.workers) {
+            const intrs = intersection(worker.targets, targets)
+            if (intrs.length > 0)
+                found.push(worker)
+        }
+        return found
+    }
+
     /**
      * @private
      */
@@ -327,6 +338,40 @@ class WorkersList {
         return response
     }
 
+    /**
+     * @param {null|string[]} targets
+     */
+    pauseTargets(targets) {
+        return this._pauseContinueWorkers('pause', targets)
+    }
+
+    /**
+     * @param {null|string[]} targets
+     */
+    continueTargets(targets) {
+        return this._pauseContinueWorkers('continue', targets)
+    }
+
+    /**
+     * @param {string} action
+     * @param {null|string[]} targets
+     * @private
+     */
+    _pauseContinueWorkers(action, targets) {
+        (targets === null ? this.workers : this.getWorkersByTargets(targets))
+            .map(worker => {
+                this.logger.debug(`${action}Targets: sending ${action} request to ${worker.connection.remoteAddr()}`)
+
+                let data = {}
+                if (targets !== null)
+                    data.targets = intersection(worker.targets, targets)
+
+                worker.connection.sendRequest(
+                    new RequestMessage(action, data)
+                ).catch(this.onWorkerRequestError.bind(this, `${action}Targets`))
+            })
+    }
+
     /**
      * @private
      */
@@ -338,6 +383,10 @@ class WorkersList {
             })
     }
 
+    onWorkerRequestError = (from, error) => {
+        this.logger.error(`${from}:`, error)
+    }
+
 }
 
 module.exports = WorkersList
\ No newline at end of file
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