run: allow profiling to be explicitly started

It used to be profiling was only started when StrongOps was started.

This caused problems for metrics and other users of the agent, because
when agent is no started first, it doesn't behave well. In particular,
it doesn't monkey patch anything, causing metrics to be lacking probe
metrics, and agent traces and express records not be available.

README.md

@@ -176,7 +176,6 @@ signalled with SIGHUP, see
 ### slc run
 
 ``` text
-usage: slc run [options] [app [app-options...]]
 usage: slr [options] [app [app-options...]]
 
 Run an app, allowing it to be profiled (using StrongOps) and supervised.
@@ -203,14 +202,15 @@ Options:
                      Disable timestamping of supervisor log messages.
   --syslog           Send supervisor and collected worker logs to syslog,
                        unsupported on Windows.
-  --metrics BACKEND  Send metrics to custom backend (default is no custom).
+  --metrics BACKEND  Report metrics to custom backend. Implies `--profile`.
   -p,--pid FILE      Write supervisor's pid to FILE, failing if FILE already
                        has a valid pid in it (default is no pid file).
   --cluster N        Set the cluster size (default is off, but see below).
-  --no-profile       Disable reporting profile data to StrongOps (default is to
-		       profile if registration data is found). Does not affect
-		       local reporting using --metrics option.
-  -C,--control CTL   Listen for local control messages on CTL (default `pmctl),
+  --profile          Start the agent. Report to StrongOps if registration data
+                       is found (this is the default).
+  --no-profile       Do not start the agent, do not report to StrongOps,
+                       do not report metrics.
+  -C,--control CTL   Listen for local control messages on CTL (default `pmctl`),
                        only supported when clustered.
   --no-control       Do not listen for local control messages.
 

bin/sl-run.js

@@ -11,15 +11,42 @@ process.on('disconnect', function() {
 var config = require('../lib/config'); // May exit, depending on argv
 var log = config.logger;
 
-if(!config.profile) {
-  if(config.isMaster) {
-    log.error('supervisor running without StrongOps (unprofiled)');
-  }
-} else {
-  require('strong-agent').profile(undefined, undefined, {
-    quiet: config.isWorker, // Quiet in worker, to avoid repeated log messages
-    logger: config.logger,
-  });
+var agent = require('../lib/agent');
+var agentOptions = {
+  quiet: config.isWorker, // Quiet in worker, to avoid repeated log messages
+  logger: config.logger,
+};
+
+switch(config.profile) {
+  case false: // Profiling explicitly disabled.
+    if(config.isMaster) {
+      log.error('supervisor running without profiling');
+    }
+    break;
+
+  case undefined: // No explicit request for profiling or metrics.
+    // Start with StrongOps if app is registered. This will print warning
+    // messages to the console if the api key is not found, which is backwards
+    // compatible.
+    agent().profile(undefined, undefined, agentOptions);
+    // Otherwise, just start. This is a no-op if it is already started.
+    agent().start();
+    break;
+
+  case true: // Profiling or metrics explicitly enabled.
+    agent().configure(agentOptions);
+    // Only try to start StrongOps if they have registered, to avoid legacy
+    // warning messages. If an app is missing a name, profile may still fail
+    // to start, so drop-through to start(). We must re-supply options.
+    if (agent().config.key)
+      agent().profile(undefined, undefined, agentOptions);
+    // Otherwise, just start. This is a no-op if already started.
+    agent().start();
+    break;
+
+  default:
+    assert(false, 'invalid profile value');
+    break;
 }
 
 if((config.clustered && config.isMaster) || config.detach){

bin/sl-run.txt

@@ -24,14 +24,15 @@ Options:
                      Disable timestamping of supervisor log messages.
   --syslog           Send supervisor and collected worker logs to syslog,
                        unsupported on Windows.
-  --metrics BACKEND  Send metrics to custom backend (default is no custom).
+  --metrics BACKEND  Report metrics to custom backend. Implies `--profile`.
   -p,--pid FILE      Write supervisor's pid to FILE, failing if FILE already
                        has a valid pid in it (default is no pid file).
   --cluster N        Set the cluster size (default is off, but see below).
-  --no-profile       Disable reporting profile data to StrongOps (default is to
-		       profile if registration data is found). Does not affect
-		       local reporting using --metrics option.
-  -C,--control CTL   Listen for local control messages on CTL (default `pmctl),
+  --profile          Start the agent. Report to StrongOps if registration data
+                       is found (this is the default).
+  --no-profile       Do not start the agent, do not report to StrongOps,
+                       do not report metrics.
+  -C,--control CTL   Listen for local control messages on CTL (default `pmctl`),
                        only supported when clustered.
   --no-control       Do not listen for local control messages.
 

lib/options.js

@@ -24,7 +24,7 @@ exports.parse = function parse(argv) {
     HELP: exports.HELP,
     argv: argv,         // process.argv stripped of command...
     args: [ '.' ],      // app app-options...
-    profile: true,
+    profile: process.env.STRONGLOOP_METRICS ? true : undefined,
     channel: 'runctl',
     log: false,
     metrics: null,
@@ -75,10 +75,12 @@ exports.parse = function parse(argv) {
       i++;
       options.metrics = options.metrics || []
       options.metrics.push(argv[i]);
+      options.profile = true;
     }
     else if(/^--metrics=/.test(option)) {
       options.metrics = options.metrics || []
       options.metrics.push(value(option));
+      options.profile = true;
     }
     else if(option === '--pid' || option === '-p') {
       i++;
@@ -92,6 +94,8 @@ exports.parse = function parse(argv) {
     }
     else if(option === '--no-profile') {
       options.profile = false;
+      options.metrics = null;
+      delete process.env.STRONGLOOP_METRICS;
     }
     else if(option === '--cluster') {
       i++;