Awesome

gtfs-rt-dump

Command-line dumper for GTFS-realtime feeds.

$ java -jar gtfs-rt-dump.jar -h
Usage: gtfs-rt-dump [-hV] [--disable-tls-validation] [-H=<String=String>]...
                    [-X=<enabledExtensions>]... [-f=<protobufPath> |
                    -u=<protobufUrl>] [-U=<username> -P=<password>] COMMAND
Parse and display the contents of a GTFS-realtime feed in a human-readable
format.
      --disable-tls-validation
                            Disable all TLS server certificate validation.
  -h, --help                Show this help message and exit.
  -H, --header=<String=String>
                            Add specified HTTP header to request.
  -V, --version             Print version information and exit.
  -X, --enable-extension=<enabledExtensions>
                            Enable specified GTFS-rt extensions. Valid values:
                              OBA, NYCT, LIRR, MNR, MTARR, MERCURY
Input can be read from a file or URL. If neither are specified, standard input
will be used.
  -f, --file=<protobufPath> Read GTFS-rt from specified file.
  -u, --url=<protobufUrl>   Read GTFS-rt from specified URL.
HTTP Basic authentication credentials can be specified if input is read from a
URL.
  -P, --password=<password> Password for HTTP Basic authentication
  -U, --username=<username> Username for HTTP Basic authentication
Commands:
  help    Displays help information about the specified command
  pbtext  Protocol Buffer text format output
  table   Formatted table output
  json    JSON output
  csv     CSV output

If pbtext or formatted table output is selected, the timestamp format can be specified:

$ java -jar gtfs-rt-dump.jar help table
Usage: gtfs-rt-dump table [--timestamp-format=<timestampFormatter>]
Formatted table output
      --timestamp-format=<timestampFormatter>
         Valid values: POSIX, ISO_8601_LOCAL, ISO_8601_UTC

Usage: gtfs-rt-dump pbtext [--timestamp-format[=<timestampFormatter>]]
Protocol Buffer text format output
      --timestamp-format[=<timestampFormatter>]
         Valid values: POSIX, ISO_8601_LOCAL, ISO_8601_UTC

To produce formatted timestamps in a timezone other than the OS timezone, set the user.timezone Java system property:

java -Duser.timezone="US/Pacific" -jar gtfs-rt-dump.jar -u http://api.bart.gov/gtfsrt/tripupdate.aspx pbtext --timestamp-format

For CSV output, a single feed component must be specified for extraction:

% java -jar gtfs-rt-dump.jar help csv  
Usage: gtfs-rt-dump csv <selectedFeedPart>
CSV output
      <selectedFeedPart>   Feed part to extract to CSV. Valid values:
                             FEED_HEADER, TRIP_UPDATES, VEHICLE_POSITIONS,
                             ALERTS

Sample usage:

$ java -jar gtfs-rt-dump.jar -u http://api.bart.gov/gtfsrt/tripupdate.aspx pbtext
header {
  gtfs_realtime_version: "1.0"
  incrementality: FULL_DATASET
  timestamp: 1418867234
}
entity {
  id: "46DC10"
  trip_update {
    trip {
      trip_id: "46DC10"
    }

The JSON output mode can be combined with jq to slice and filter the resulting output:

$ java -jar gtfs-rt-dump.jar -u http://api.bart.gov/gtfsrt/tripupdate.aspx json | jq '[.entity[].tripUpdate | .trip.tripId as $tripId | .stopTimeUpdate[] | {tripId: $tripId, stopId: .stopId, arrival: .arrival.time|todate}] | map(select(.stopId == "EMBR")) | sort_by(.arrival) | .[0:3]'
[
  {
    "tripId": "4531853SAT",
    "stopId": "EMBR",
    "arrival": "2020-01-19T03:12:04Z"
  },
  {
    "tripId": "1071858SAT",
    "stopId": "EMBR",
    "arrival": "2020-01-19T03:16:42Z"
  },
  {
    "tripId": "3611847SAT",
    "stopId": "EMBR",
    "arrival": "2020-01-19T03:19:57Z"
  }
]