Implement and test --check-spool. Make Mock/UserAgent save put and post data in an array. Make Percona/WebAPI/Client accept ready-made text resources, for multi-part resources.

2025-09-20 19:04:59 +00:00 · 2013-01-08 18:49:42 -07:00
parent d68301f293
commit 526437632c
6 changed files with 435 additions and 108 deletions
--- a/bin/pt-agent
+++ b/bin/pt-agent
@@ -952,12 +952,17 @@ sub _set {
   my $res    = $args{resources};
   my $url    = $args{url};

-   my $content;
+   my $content = '';
   if ( ref($res) eq 'ARRAY' ) {
+      PTDEBUG && _d('List of resources');
      $content = '[' . join(",\n", map { as_json($_) } @$res) . ']';
   }
-   elsif ( -f $res ) {
-      PTDEBUG && _d('Reading content from file', $res);
+   elsif ( ref($res) ) {
+      PTDEBUG && _d('Resource object');
+      $content = as_json($res);
+   }
+   elsif ( $res !~ m/\n/ && -f $res ) {
+      PTDEBUG && _d('List of resources in file', $res);
      $content = '[';
      my $data = do {
         local $INPUT_RECORD_SEPARATOR = undef;
@@ -969,7 +974,8 @@ sub _set {
      $content .= $data;
   }
   else {
-      $content = as_json($res);
+      PTDEBUG && _d('Resource text');
+      $content = $res;
   }

   eval {
@@ -4363,6 +4369,7 @@ use POSIX       qw(signal_h);
 use Time::HiRes qw(sleep time);
 use JSON        qw(decode_json);
 use File::Temp  qw(tempfile);
+use File::Path;

 use Percona::Toolkit; 
 use Percona::WebAPI::Client;
@@ -4376,6 +4383,7 @@ use Percona::WebAPI::Util;

 Percona::Toolkit->import(qw(_d Dumper have_required_args));
 Percona::WebAPI::Util->import(qw(resource_diff));
+Percona::WebAPI::Representation->import(qw(as_json as_config));
 Transformers->import(qw(ts));

 use sigtrap 'handler', \&sig_int, 'normal-signals';
@@ -4407,19 +4415,79 @@ sub main {
   $o->usage_or_errors();

   # ########################################################################
-   # Check the API key.
+   # Check the API key and agent ID.
   # ########################################################################
   my $api_key = $o->get('api-key');
   if ( !$api_key ) {
      _err("No API key was found or specified.  pt-agent requires a "
-         . "Percona Web Services API key to run.  Put your API key "
+         . "Percona Web Services API key.  Put your API key "
         . "in a --config file or specify it with --api-key.");
   }

+   my $agent_id = $o->get('agent-id');
+   if ( ($o->get('check-spool') || $o->get('run-service')) && !$agent_id ) {
+      _err("No agent ID was found or specified.  --check-spool and "
+         . "--run-service require an agent ID.  Run pt-agent without these "
+         . "options to create and configure the agent, then try again.");
+   }
+
   # ########################################################################
-   # Check the config file.
-   # TODO: only the main proc needs write access
+   # --run-service
+   # This runs locally and offline, doesn't need a web API connection.
   # ########################################################################
+   if ( my $service = $o->get('run-service') ) {
+      $exit_status = run_service(
+         service   => $service,
+         spool_dir => $o->get('spool'),
+         lib_dir   => $o->get('lib'),
+      );
+      _info("Done running $service, exit $exit_status");
+      exit $exit_status;
+   }
+
+   # ########################################################################
+   # Connect to the Percona web API.
+   # ########################################################################
+   my ($client, $agent) = connect_to_percona(
+      api_key  => $api_key,
+      agent_id => $agent_id,  # optional
+   );
+  
+   # ########################################################################
+   # --check-spool
+   # ########################################################################
+   if ( $o->get('check-spool') ) {
+      # TODO: rewrite Daemon to have args passed in so we can do
+      # a PID file check for spool procs.  Or implement file locking.
+      check_spool(
+         client    => $client,
+         agent     => $agent,
+         spool_dir => $o->get('spool'),
+      );
+      _info("Done checking spool, exit $exit_status");
+      exit $exit_status;
+   }
+
+   # ########################################################################
+   # This is the main pt-agent daemon, a long-running and resilient
+   # process.  Only internal errors should cause it to stop.  Else,
+   # external errors, like Percona web API not responding, should be
+   # retried forever.
+   # ########################################################################
+
+   # Daemonize first so all output goes to the --log.
+   my $daemon;
+   if ( $o->get('daemonize') ) {
+      $daemon = new Daemon(o=>$o);
+      $daemon->daemonize();
+      PTDEBUG && _d('I am a daemon now');
+   }
+   elsif ( $o->get('pid') ) {
+      $daemon = new Daemon(o=>$o);
+      $daemon->make_PID_file();
+   }
+
+   # Check and init the config file.
   my $config_file = get_config_file();
   _info("Config file: $config_file");
   if ( -f $config_file ) {
@@ -4435,95 +4503,32 @@ sub main {
      };
      if ( $EVAL_ERROR ) {
         chomp $EVAL_ERROR;
-         _err("$EVAL_ERROR.  pt-agent requires write access to "
-            . "$config_file to run.");
+         _err($EVAL_ERROR
+            . "\npt-agent requires write access to $config_file.");
      }
   }

-   # ########################################################################
-   # Check the lib dir.
-   # ########################################################################
+   # Wait time between checking for new config and services.
+   # Use the tool's built-in default until a config is gotten,
+   # then config->{check-interval} will be pass in.
+   my $check_interval = $o->get('check-interval');
+   my $check_wait     = sub {
+      my ($t) = @_;
+      return unless $oktorun;
+      $t ||= $check_interval;
+      _info("Sleeping $t seconds");
+      sleep $t;
+   };

-   # ########################################################################
-   # Run pt-agent.
-   # ########################################################################
-   my $daemon;
-
-   if ( my $service = $o->get('run-service') ) {
-      run_service(
-         service   => $service,
-         spool_dir => $o->get('spool'),
-         lib_dir   => $o->get('lib'),
-      );
-   }
-   elsif ( $o->get('check-spool') ) {
-      check_spool(
-         api_key   => $api_key,
-         spool_dir => $o->get('spool'),
-         lib_dir   => $o->get('lib'),
-      );
-   }
-   else {
-      # This is the main pt-agent daemon, a long-running and resilient
-      # process.  Only internal errors should cause it to stop.  Else,
-      # external errors, like Percona web API not responding, should be
-      # retried forever.
-      if ( $o->get('daemonize') ) {
-         $daemon = new Daemon(o=>$o);
-         $daemon->daemonize();
-         PTDEBUG && _d('I am a daemon now');
-      }
-      elsif ( $o->get('pid') ) {
-         $daemon = new Daemon(o=>$o);
-         $daemon->make_PID_file();
-      }
-
-      # During initial connection and agent init, wait less time
-      # than --check-interval between errors.
-      # TODO: make user-configurable?  --reconnect-interval?
-      my $init_interval = 120;
-      my $init_wait     = sub {
-         return unless $oktorun;
-         _info("Sleeping $init_interval seconds");
-         sleep $init_interval;
-      };
-
-      # Get a connected Percona Web API client.
-      my $client = get_api_client(
-         api_key  => $api_key,
-         tries    => undef,
-         interval => $init_wait,
-      );
-
-      # Start or create the agent.
-      my $agent = init_agent(
-         client   => $client,
-         interval => $init_wait,
-         agent_id => $o->get('agent-id'),  # optional
-      );
-
-      # Wait time between checking for new config and services.
-      # Use the tool's built-in default until a config is gotten,
-      # then config->{check-interval} will be pass in.
-      my $check_interval = $o->get('check-interval');
-      my $check_wait     = sub {
-         my ($t) = @_;
-         return unless $oktorun;
-         $t ||= $check_interval;
-         _info("Sleeping $t seconds");
-         sleep $t;
-      };
-
-      # Run the agent's main loop which doesn't return until the service
-      # is stopped, killed, or has an internal bug.
-      run_agent(
-         agent       => $agent,
-         client      => $client,
-         interval    => $check_wait,
-         config_file => $config_file,
-         lib_dir     => $o->get('lib'),
-      );
-   }
+   # Run the agent's main loop which doesn't return until the service
+   # is stopped, killed, or has an internal bug.
+   run_agent(
+      agent       => $agent,
+      client      => $client,
+      interval    => $check_wait,
+      config_file => $config_file,
+      lib_dir     => $o->get('lib'),
+   );

   _info("pt-agent exit $exit_status, oktorun $oktorun");

@@ -4538,6 +4543,47 @@ sub main {
 # Percona Web API subs for agent and spool processes #
 # ################################################## #

+# Wrapper for code common to main agent and --check-spool process:
+# connect to the Percona web API by getting a client and an Agent.
+sub connect_to_percona {
+   my (%args) = @_;
+
+   have_required_args(\%args, qw(
+      api_key
+   )) or die;
+   my $api_key  = $args{api_key};
+   my $interval = $args{interval};
+
+   # Optional args
+   my $agent_id = $args{agent_id};
+
+   # During initial connection and agent init, wait less time
+   # than --check-interval between errors.
+   # TODO: make user-configurable?  --reconnect-interval?
+   my $init_interval = 120;
+   my $init_wait     = sub {
+      return unless $oktorun;
+      _info("Sleeping $init_interval seconds");
+      sleep $init_interval;
+   };
+
+   # Get a connected Percona Web API client.
+   my $client = get_api_client(
+      api_key  => $api_key,
+      tries    => undef,
+      interval => $init_wait,
+   );
+
+   # Start or create the agent.
+   my $agent = init_agent(
+      client   => $client,
+      interval => $init_wait,
+      agent_id => $agent_id,  # optional
+   );
+
+   return $client, $agent;
+}
+
 # Create and connect a Percona Web API client.
 sub get_api_client {
   my (%args) = @_;
@@ -4573,10 +4619,6 @@ sub get_api_client {
   return $client;
 }

-# ################################ #
-# Agent (main daemon) process subs #
-# ################################ #
-
 # Initialize the agent, i.e. create and return an Agent resource.
 # If there's an agent_id, then its updated (PUT), else a new agent
 # is created  (POST).  Doesn't return until successful.
@@ -4597,6 +4639,7 @@ sub init_agent {

   _info('Initializing agent');

+
   # Do a version-check every time the agent starts.  If versions
   # have changed, this can affect how services are implemented.
   $versions ||= get_versions();
@@ -4640,6 +4683,10 @@ sub init_agent {
   return $agent;
 }

+# ################################ #
+# Agent (main daemon) process subs #
+# ################################ #
+
 # Run the agent, i.e. exec the main loop to check/update the config
 # and services.  Doesn't return until service stopped or killed.
 sub run_agent {
@@ -4705,6 +4752,8 @@ sub run_agent {
         _warn($EVAL_ERROR);
      }

+      # TODO: need to schedule a pt-agent --check-spool process.
+
      # Get services only if there's a current, running config.
      # Without one, we won't know how to implement services.
      if ( $config ) {
@@ -4787,7 +4836,7 @@ sub write_config {
      print { $fh } $api_key, "\n"
         or die "Error writing to $file: $OS_ERROR";
   }
-   print { $fh } Percona::WebAPI::Representation::as_config($config)
+   print { $fh } as_config($config)
      or die "Error writing to $file: $OS_ERROR";
   close $fh
      or die "Error closing $file: $OS_ERROR";
@@ -4818,7 +4867,7 @@ sub write_services {
      my $action = -f $file ? 'Updated' : 'Created';
      open my $fh, '>', $file
         or die "Error opening $file: $OS_ERROR";
-      print { $fh } Percona::WebAPI::Representation::as_json($service)
+      print { $fh } as_json($service)
         or die "Error writing to $file: $OS_ERROR";
      close $fh
         or die "Error closing $file: $OS_ERROR";
@@ -4828,7 +4877,7 @@ sub write_services {

   # Remove old services: one's that still exisit but weren't
   # writen ^, so they're no longer implemented.
-   opendir my $dh, $lib_dir
+   opendir(my $dh, $lib_dir)
      or die "Error opening $lib_dir: $OS_ERROR";
   while ( my $file = readdir($dh) ) {
      next if -d $file;
@@ -5053,10 +5102,137 @@ sub replace_special_vars {
 # Spool process subs #
 # ################## #

+# Send every file or directory in each service's directory in --spool/.
+# E.g. --spool/query-monitor should contain files with pt-query-digest
+# output.  The per-service dirs are created in run_service(). 
 sub check_spool {
+   my (%args) = @_;
+
+   have_required_args(\%args, qw(
+      client
+      agent
+      spool_dir
+   )) or die;
+   my $client    = $args{client};
+   my $agent     = $args{agent};
+   my $spool_dir = $args{spool_dir};
+
+   # Iterate through the service dirs in --spool/.
+   chdir $spool_dir
+      or die "Error changing dir to $spool_dir: $OS_ERROR";
+   opendir(my $spool_dh, $spool_dir)
+      or die "Error opening $spool_dir: $OS_ERROR";
+   _info("Checking spool directory $spool_dir");
+   SERVICE:
+   while ( my $service_dir = readdir($spool_dh) ) {
+      next unless -d $service_dir && $service_dir !~ m/^\./;
+
+      # Need a link for the service to know where to send the data.
+      # TODO: should pt-agent rm the old service dir?
+      if ( !$client->links->{$service_dir} ) {
+         _warn("Ignoring $service_dir because there is no link for "
+            . "the service.  If this agent no longer implements "
+            . "the service, then remove $spool_dir/$service_dir/.");
+         next SERVICE;
+      }
+
+      # Iterate through the data files or dirs in this service's dir.
+      opendir(my $service_dh, $service_dir);
+      if ( !$service_dh ) {
+         chomp $EVAL_ERROR;
+         _warn("Error opening $service_dir: $OS_ERROR");
+         next SERVICE;
+      }
+      DATA:
+      while ( my $file = readdir($service_dh) ) {
+         next unless -f "$service_dir/$file";
+         $file = "$service_dir/$file";
+
+         # Send the data to Percona.
+         eval {
+            if ( -d $file ) {
+               # TODO
+            }
+            else {
+               # The file is a file, yay.  Just send it as-is.
+               send_file(
+                  client => $client,
+                  agent  => $agent,
+                  file   => $file,
+                  url    => $client->links->{$service_dir},
+               );
+            }
+         };
+         if ( $EVAL_ERROR ) {
+            chomp $EVAL_ERROR;
+            _warn("Failed to send $file: $EVAL_ERROR");
+            next DATA;
+         }
+
+         # Remove the data if sent successfully.
+         eval {
+            if ( -d $file ) {
+               # TODO: rmtree
+            }
+            else {
+               unlink $file or die $OS_ERROR;
+            }
+         };
+         if ( $EVAL_ERROR ) {
+            chomp $EVAL_ERROR;
+            _warn("Sent $file but failed to remove it: $EVAL_ERROR");
+            last SERVICE;
+         }
+
+         _info("Sent and removed $file");
+      } # DATA
+      closedir $service_dh
+         or warn "Error closing $service_dir: $OS_ERROR";
+   } # SERVICE
+
+   closedir $spool_dh
+      or warn "Error closeing $spool_dir: $OS_ERROR";
+
+   return;
 }

-sub send_data {
+# Send the Agent and file's contents as-is as a multi-part POST.
+sub send_file {
+   my (%args) = @_;
+
+   have_required_args(\%args, qw(
+      client
+      agent
+      file
+      url
+   )) or die;
+   my $client = $args{client};
+   my $agent  = $args{agent};
+   my $file   = $args{file};
+   my $url    = $args{url};
+
+   _info("Sending $file to $url");
+
+   # Create a multi-part resource: first the Agent, so Percona knows
+   # from whom this data is coming, then the contents of the file as-is.
+   # We don't know or care about the file's contents, but Percona will.
+   my $agent_json = as_json($agent);
+   my $data       = slurp($file);
+   my $boundary   = '--Ym91bmRhcnk=';  # "boundary" in base64
+   my $resource   = <<CONTENT;
+$agent_json
+$boundary
+$data
+CONTENT
+
+   chomp($resource);  # remove trailing newline
+
+   $client->post(
+      url       => $url,
+      resources => $resource,
+   );
+
+   return;
 }

 # ################## #