Multiple changes.

- Colorize output by default, add option to disable.
 - Time parsing per incoming client.
 - Add a "quiet" mode.
 - Allow binding to a specific IP address.
 - Allow debug mode to be set without recompiling.
 - Alter thread wrapper for reporting and config passing.
 - Fix file descriptor leak with client connections.
 - Wait for current threads to finish before exiting.

Makefile

@@ -4,17 +4,17 @@ FILES = netdata_tsrelay.nim
 default: development
 
 debug: ${FILES}
-	nim --assertions:on --nimcache:.cache c ${FILES}
+	nim --assertions:on --threads:on --nimcache:.cache c ${FILES}
 
 development: ${FILES}
 	# can use gdb with this...
-	nim --debugInfo --threads:on --linedir:on --define:testing --nimcache:.cache c ${FILES}
+	nim --debugInfo --threads:on --linedir:on -d:testing -d:nimTypeNames --nimcache:.cache c ${FILES}
 
 debugger: ${FILES}
 	nim --debugger:on --threads:on --nimcache:.cache c ${FILES}
 
 release: ${FILES}
-	nim -d:release --opt:speed --threads:on --nimcache:.cache c ${FILES}
+	nim -d:release --opt:speed --parallelBuild:0 --threads:on --nimcache:.cache c ${FILES}
 
 docs:
 	nim doc ${FILES}

README.md

@@ -68,6 +68,6 @@ example configuration for `netdata.conf`:
     prefix             = n
     update every       = 10
     buffer on failures = 6
-    send charts matching = !cpu.cpu* !ipv6* nfs.rpc net.* net_drops.* net_packets.* !system.interrupts* system.* disk.* disk_space.* disk_ops.* mem.* users.*
+    send charts matching = !cpu.cpu* !ipv6* !users* nfs.rpc net.* net_drops.* net_packets.* !system.interrupts* system.* disk.* disk_space.* disk_ops.* mem.*
 ```
 

netdata_tsrelay.nim

@@ -31,18 +31,28 @@
 import
     db_postgres,
     json,
+    math,
     nativesockets,
     net,
+    os,
     parseopt2,
     strutils,
     tables,
+    terminal,
+    times,
     threadpool
 
 
 const
     VERSION = "v0.1.0"
     USAGE = """
-./netdata_tsrelay --dbopts="[PostgreSQL connection string]" --listen-port=14866
+./netdata_tsrelay [-q][-v][-h] --dbopts="[PostgreSQL connection string]" --listen-port=14866 --listen-addr=0.0.0.0
+
+  -q: Quiet mode.  No output at all.  Ignored if -d is supplied.
+  -c: Suppress ANSI color output.
+  -d: Debug: Show incoming and parsed data.
+  -v: Display version number.
+  -h: Help.  You're lookin' at it.
 
 The default connection string is:
   "host=localhost port=5432 dbname=netdata user=netdata application_name=netdata-tsrelay"
@@ -55,18 +65,41 @@ The default connection string is:
     """
 
 
-type Config = object of RootObj
+type
+    Config = object of RootObj
         dbopts:      string  # The postgresql connection parameters.  (See https://www.postgresql.org/docs/current/static/libpq-connect.html)
         listen_port: int     # The port to listen for incoming connections
+        listen_addr: string  # The IP address listen for incoming connections.  Defaults to inaddr_any.
+        verbose:     bool    # Be informative
+        debug:       bool    # Spew out raw data
+        use_color:   bool    # Pretty things up a little, probably want to disable this if debugging
 
-# Global config object
+
+# The global config object
+#
+# FIXME:  Rather than pass this all over the
+# place, consider channels and createThread instead of spawn.
 #
 var conf = Config(
     dbopts: "host=localhost port=5432 dbname=netdata user=netdata application_name=netdata-tsrelay",
-    listen_port: 14866
+    listen_port: 14866,
+    listen_addr: "0.0.0.0",
+    verbose: true,
+    debug: false,
+    use_color: true
 )
 
 
+proc hl( msg: string, fg: ForegroundColor, bright=false ): string =
+    ## Quick wrapper for color formatting a string, since the 'terminal'
+    ## module only deals with stdout directly.
+    if not conf.use_color: return msg
+
+    var color: BiggestInt = ord( fg )
+    if bright: inc( color, 60 )
+    result = "\e[" & $color & 'm' & msg & "\e[0m"
+
+
 proc fetch_data( client: Socket ): string =
     ## Netdata JSON backend doesn't send a length, so we read line by
     ## line and wait for stream timeout to determine a "sample".
@@ -78,7 +111,7 @@ proc fetch_data( client: Socket ): string =
         discard
 
 
-proc parse_data( data: string ): Table[ BiggestInt, JsonNode ] =
+proc parse_data( data: string, conf: Config ): Table[ BiggestInt, JsonNode ] =
     ## Given a raw +data+ string, parse JSON and return a table of
     ## JSON samples ready for writing, keyed by timestamp. Netdata can
     ## buffer multiple samples in one batch.
@@ -88,14 +121,15 @@ proc parse_data( data: string ): Table[ BiggestInt, JsonNode ] =
     result = init_table[ BiggestInt, JsonNode ]()
 
     for sample in split_lines( data ):
-        if defined( testing ): echo sample
+        if conf.debug: echo sample.hl( fgBlack, bright=true )
         if sample.len == 0: continue
 
         var parsed: JsonNode
         try:
             parsed = sample.parse_json
         except JsonParsingError:
-            if defined( testing ): echo "Unable to parse sample line: " & sample
+            discard
+            if conf.debug: echo hl( "Unable to parse sample line: " & sample.hl(fgRed, bright=true), fgRed )
 
         # Create or use existing Json object for modded data.
         #
@@ -112,25 +146,27 @@ proc parse_data( data: string ): Table[ BiggestInt, JsonNode ] =
         pivot[ "hostname" ] = parsed[ "hostname" ]
         pivot[ name ] = parsed[ "value" ]
 
-    if defined( testing ): echo $result.len & " samples"
-
     return result
 
 
-proc process( client: Socket, db: DBConn ): void =
+proc process( client: Socket, db: DBConn, conf: Config ): int =
     ## Do the work for a connected client within a thread.
+    ## Returns the number of samples parsed.
     var raw_data = client.fetch_data
 
+    # Done with the socket, netdata will automatically
+    # reconnect.  Save local resources/file descriptors
+    # by closing after the send is considered complete.
+    #
     try:
-        if defined( testing ):
-            echo "Closed connection for " & get_peer_addr( client.get_fd, get_sock_domain(client.get_fd) )[0]
         client.close
     except OSError:
         return
 
-    var samples = parse_data( raw_data )
+    # Pivot data and save to SQL.
-    if samples.len == 0: return
+    #
-
+    var samples = parse_data( raw_data, conf )
+    if samples.len != 0:
         db.exec sql( "BEGIN" )
         for timestamp, sample in samples:
             var host = sample[ "hostname" ].get_str
@@ -138,30 +174,68 @@ proc process( client: Socket, db: DBConn ): void =
             db.exec sql( INSERT_SQL ), timestamp, host, sample
         db.exec sql( "COMMIT" )
 
+    return samples.len
+
+
+proc runthread( client: Socket, address: string, db: DBConn, conf: Config ): void {.thread.} =
+    ## A thread that performs that dispatches processing and returns
+    ## results.
+    let t0 = cpu_time()
+    var samples = client.process( db, conf )
+
+    if conf.verbose:
+        echo(
+            hl( $samples, fgWhite, bright=true ),
+            " sample(s) parsed from ",
+            address.hl( fgYellow, bright=true ),
+            " in ", hl($( round(cpu_time() - t0, 3) ), fgWhite, bright=true), " seconds."
+            # " ", hl($(round((get_occupied_mem()/1024/1024),1)), fgWhite, bright=true), "MB memory used."
+        )
+    when defined( testing ): dumpNumberOfInstances()
+
+
 proc serverloop: void =
     ## Open a database connection, bind to the listening socket,
     ## and start serving incoming netdata streams.
     let db = open( "", "", "", conf.dbopts )
-    echo "Successfully connected to the backend database."
+    if conf.verbose: echo( "Successfully connected to the backend database.".hl( fgGreen ) )
+
+    var
+        server = newSocket()
+        client = newSocket()
 
-    var server = newSocket()
-    echo "Listening for incoming connections on port ", conf.listen_port, "..."
     server.set_sock_opt( OptReuseAddr, true )
-    server.bind_addr( Port(conf.listen_port) )
+    server.bind_addr( Port(conf.listen_port), conf.listen_addr )
     server.listen()
 
-    while true:
+    if conf.verbose:
-        var
+        echo(
-            client  = newSocket()
+            "Listening for incoming connections on ".hl( fgGreen, bright=true ),
-            address = ""
+            hl( (if conf.listen_addr == "0.0.0.0": "*" else: conf.listen_addr) , fgBlue, bright=true ),
+            ":",
+            hl( $conf.listen_port, fgBlue, bright=true ),
+        )
+        echo ""
 
-        server.acceptAddr( client, address )
+    while true:
-        echo "New connection: " & address
+        var address = ""
-        spawn client.process( db )
+        server.acceptAddr( client, address ) # blocking call
+        spawn runthread( client, address, db, conf )
+
+
+proc atexit() {.noconv.} =
+    ## Exit cleanly after waiting on any running threads.
+    echo "Exiting..."
+    sync()
+    quit( 0 )
 
 
 proc parse_cmdline: void =
     ## Populate the config object with the user's preferences.
+
+    # always set debug mode if development build.
+    conf.debug = defined( testing )
+
     for kind, key, val in getopt():
         case kind
 
@@ -170,15 +244,25 @@ proc parse_cmdline: void =
 
         of cmdLongOption, cmdShortOption:
             case key
+                of "debug", "d":
+                    conf.debug = true
+
+                of "no-color", "c":
+                    conf.use_color = false
+
                 of "help", "h":
                     echo USAGE
                     quit( 0 )
 
+                of "quiet", "q":
+                    conf.verbose = false
+            
                 of "version", "v":
-                    echo "netdata_tsrelay ", VERSION
+                    echo hl( "netdata_tsrelay " & VERSION, fgWhite, bright=true )
                     quit( 0 )
                
                 of "dbopts": conf.dbopts = val
+                of "listen-addr", "a": conf.listen_addr = val
                 of "listen-port", "p": conf.listen_port = val.parse_int
 
                 else: discard
@@ -187,7 +271,11 @@ proc parse_cmdline: void =
 
 
 when isMainModule:
+    system.addQuitProc( resetAttributes )
+    system.addQuitProc( atexit )
+
     parse_cmdline()
-    if defined( testing ): echo conf
+
+    if conf.debug: echo hl( $conf, fgYellow )
     serverloop()