#

# Copyright (c) 2018, Mahlon E. Smith <mahlon@martini.nu>

# All rights reserved.

# Redistribution and use in source and binary forms, with or without

# modification, are permitted provided that the following conditions are met:

#

#     * Redistributions of source code must retain the above copyright

#       notice, this list of conditions and the following disclaimer.

#

#     * Redistributions in binary form must reproduce the above copyright

#       notice, this list of conditions and the following disclaimer in the

#       documentation and/or other materials provided with the distribution.

#

#     * Neither the name of Mahlon E. Smith nor the names of his

#       contributors may be used to endorse or promote products derived

#       from this software without specific prior written permission.

#

# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY

# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

# DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY

# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

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import

    db_postgres,

    json,

    math,

    nativesockets,

    net,

    os,

    parseopt2,

    strutils,

    tables,

    terminal,

const

    VERSION = "v0.1.0"

    USAGE = """

./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.

  -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"

    """

    INSERT_SQL = """

    INSERT INTO netdata

        ( time, host, metrics )

    VALUES

        ( 'epoch'::timestamptz + ? * '1 second'::interval, ?, ? )

    """

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

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.

    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".

    try:

    except TimeoutError:

        discard

    # Hash of sample timeperiods to pivoted json data

    for sample in split_lines( data ):

        var parsed: JsonNode

        try:

            parsed = sample.parse_json

        except JsonParsingError:

            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.

        #

        var pivot: JsonNode

    ## Do the work for a connected client within a thread.

    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:

        client.close

    except OSError:

        return

    if conf.verbose:

        echo(

            " 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."

        )

    ## Open a database connection, bind to the listening socket,

    ## and start serving incoming netdata streams.

    let db = open( "", "", "", conf.dbopts )

    server.set_sock_opt( OptReuseAddr, true )

    server.bind_addr( Port(conf.listen_port), conf.listen_addr )

    server.listen()

    if conf.verbose:

        echo(

            "Listening for incoming connections on ".hl( fgGreen, bright=true ),

            hl( (if conf.listen_addr == "0.0.0.0": "*" else: conf.listen_addr) , fgBlue, bright=true ),

            ":",

            hl( $conf.listen_port, fgBlue, bright=true ),

        )

        echo ""

    while true:

        client.close

        when defined( testing ): dumpNumberOfInstances()

    ## Populate the config object with the user's preferences.

    # always set debug mode if development build.

    for kind, key, val in getopt():

        case kind

        of cmdArgument:

            discard

        of cmdLongOption, cmdShortOption:

            case key

                of "debug", "d":

                of "help", "h":

                    echo USAGE

                    quit( 0 )

                of "quiet", "q":

                of "version", "v":

                    echo hl( "netdata_tsrelay " & VERSION, fgWhite, bright=true )

                    quit( 0 )

                else: discard

        of cmdEnd: assert( false ) # shouldn't reach here ever

when isMainModule:

    system.addQuitProc( resetAttributes )

    if conf.debug: echo hl( $conf, fgYellow )