Comments (4)
Hi folks,
I found the error and solution myself. Anyhow, I am still wondering how can I verify that encoding finished successful without decoding the buffer and looking at the message content. Does anyone has a little advice for me?
Here is the code example:
const GtfsRealtimeBindings = require('gtfs-realtime-bindings');
const debug = require('debug')('gtfs');
var feedHeader = GtfsRealtimeBindings.transit_realtime.FeedHeader.create({
gtfsRealtimeVersion:'2.0'
});
var pos = GtfsRealtimeBindings.transit_realtime.Position.create({
latitude:36,longitude:-79});
var vehiclePosition = GtfsRealtimeBindings.transit_realtime.VehiclePosition.create({
position:pos});
var feedEntity = GtfsRealtimeBindings.transit_realtime.FeedEntity.create({
id:'uuid-foo-bar',vehicle:vehiclePosition
});
var feedMessage = GtfsRealtimeBindings.transit_realtime.FeedMessage.create({
header:feedHeader,
entity:[feedEntity]
});
var errMsg = GtfsRealtimeBindings.transit_realtime.FeedMessage.verify(feedMessage);
if (errMsg){
debug('feedMessage invalid')
throw Error(errMsg);
}else{
debug('feedMessage valid')
}
debug("JSON: %s", JSON.stringify(feedMessage));
var encodedFeedMsg = GtfsRealtimeBindings.transit_realtime.FeedMessage.encode(feedMessage).finish();
debug('feedMessage encoded')
var decodedFeedMsg = GtfsRealtimeBindings.transit_realtime.FeedMessage.decode(encodedFeedMsg);
debug('feedMessage decoded')
debug("JSON: %s", JSON.stringify(decodedFeedMsg));
And here is the respective CLI output:
[nodemon] starting `node index.js`
gtfs feedMessage valid +0ms
gtfs JSON: {"header":{"gtfsRealtimeVersion":"2.0"},"entity":[{"id":"uuid-foo-bar","vehicle":{"position":{"latitude":36,"longitude":-79}}}]} +4ms
gtfs feedMessage encoded +3ms
gtfs feedMessage decoded +1ms
gtfs JSON: {"header":{"gtfsRealtimeVersion":"2.0"},"entity":[{"id":"uuid-foo-bar","vehicle":{"position":{"latitude":36,"longitude":-79}}}]} +0ms
[nodemon] clean exit - waiting for changes before restart
from gtfs-realtime-bindings.
Hi folks,
my next try ended in a message that is valid according to the library but can not be encoded.
Source code:
const GtfsRealtimeBindings = require('gtfs-realtime-bindings');
const debug = require('debug')('gtfs');
var feedHeader = GtfsRealtimeBindings.transit_realtime.FeedHeader.create(); // or use .fromObject if conversion is necessary
debug('feedHeader created')
feedHeader.gtfs_realtime_version="2.0"
var feedMessage = GtfsRealtimeBindings.transit_realtime.FeedMessage.create(); // or use .fromObject if conversion is necessary
debug('feedMessage created')
feedMessage.header=feedHeader;
var feedEntity = GtfsRealtimeBindings.transit_realtime.FeedEntity.create(); // or use .fromObject if conversion is necessary
debug('feedEntity created')
var vehiclePosition = GtfsRealtimeBindings.transit_realtime.VehiclePosition.create(); // or use .fromObject if conversion is necessary
debug('vehiclePosition created')
var pos = GtfsRealtimeBindings.transit_realtime.Position.create(); // or use .fromObject if conversion is necessary
debug('pos created')
pos.latitude=36;
pos.longitude=-79;
var errMsg = GtfsRealtimeBindings.transit_realtime.Position.verify(pos);
if (errMsg){
debug('pos invalid')
throw Error(errMsg);
}else{
debug('pos valid')
}
vehiclePosition.position=pos;
feedEntity.vehicle=vehiclePosition;
feedMessage.entity=[feedEntity];
var errMsg = GtfsRealtimeBindings.transit_realtime.FeedMessage.verify(feedMessage);
if (errMsg){
debug('feedMessage invalid')
throw Error(errMsg);
}else{
debug('feedMessage valid')
}
var errMsg = GtfsRealtimeBindings.transit_realtime.FeedMessage.encode(feedMessage);
if (errMsg){
debug('encode error: %s',errMsg.toString())
throw Error(errMsg);
}else{
debug('encode success')
}
Error:
[nodemon] restarting due to changes...
[nodemon] starting `node index.js`
gtfs feedHeader created +0ms
gtfs feedHeader valid +3ms
gtfs feedMessage created +1ms
gtfs feedMessage valid +0ms
gtfs feedEntity created +0ms
gtfs vehiclePosition created +0ms
gtfs vehiclePosition valid +0ms
gtfs pos created +1ms
gtfs pos valid +0ms
gtfs feedEntity valid +0ms
gtfs feedMessage valid +0ms
gtfs encode error: [object Object] +2ms
/home/user/Desktop/sandbox/gtfsRtBindingsEncode/index.js:82
throw Error(errMsg);
^
Error: [object Object]
at Object.<anonymous> (/home/user/Desktop/sandbox/gtfsRtBindingsEncode/index.js:82:11)
at Module._compile (internal/modules/cjs/loader.js:778:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
at Module.load (internal/modules/cjs/loader.js:653:32)
at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
at Function.Module._load (internal/modules/cjs/loader.js:585:3)
at Function.Module.runMain (internal/modules/cjs/loader.js:831:12)
at startup (internal/bootstrap/node.js:283:19)
at bootstrapNodeJSCore (internal/bootstrap/node.js:623:3)
[nodemon] app crashed - waiting for file changes before starting...
Do you guys have any clue what is the reason for the error?
Cheers!
from gtfs-realtime-bindings.
@dancesWithCycles Protobufs are simply a way to serialize data (typically into a packed, binary format), so a successful encoding output is only verifiable by performing a corresponding decode on that encoded message. If you wanted to ensure that the output is truly language and platform neutral, you could take the resulting output and deserialize it using another language. The expectation is that the encoded message could still be decoded.
from gtfs-realtime-bindings.
proto3 version does have a canonical JSON format (as opposed to binary) for serialization, which can help with debugging and triaging these sorts of issues via manual human inspection, but GTFS-Realtime currently uses the proto2 version, so that isn't applicable here
from gtfs-realtime-bindings.
Related Issues (20)
- Add CI jobs for each set of (supported) language bindings
- Dockerize Java language bindings
- Dockerize .NET bindings
- migrate gtfs-realtime.proto file to use git submodule
- Add base shell script that will perform proto codegen for all language bindings HOT 1
- Publish go module for golang bindings HOT 16
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- underscores/snake case vs camelCase naming conventions HOT 3
- Publish Java bindings to Maven Central HOT 2
- Add support for Kotlin
- Go: github.com/golang/protobuf is deprecated HOT 2
- Release version 0.0.8 on Maven Central HOT 2
- Cannot find groupId on maven central for version 0.0.8 HOT 1
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from gtfs-realtime-bindings.