Zipkin-Javascript-Opentracing 
Installation
Run npm install --save zipkin-javascript-opentracing to install the library.
For usage instructions, please see the examples in the examples/
directory. There is a basic vanilly
javascript
example that shows how to use the tracer in the context of a single express
server and there is an advanced vanilla
javascript
example that shows how multiple services (express API and frontend) might
interact and share a tracing context.
Limitations
injecting and ejecting
We currently only support HTTP Headers. If you need your own mechanism, feel
free to do a PR. Also we assume that you only inject the HTTP Headers once,
otherwise we will send multiple ClientSend annotations for you.
Also you can only finish spans which were not extracted. If you like this behaviour to be different, please open an issue.
Flags
They are currently not supported, feel free to do a PR.
Follows From (zipkin)
FollowsFrom is not supported by openTracing, as far as I understand.
Additional options for starting a span
We need to know if this is a server or client to set the right annotations. Therefore we need the kind attribute to be set.
Example
All examples need to run zipkin on "localhost:9411". This is best achieved by
using docker:
docker run -d -p 9411:9411 openzipkin/zipkinBasic
To see how to use this library with only one service see
examples/vanillajs/basic. You can run the example with npm run example:basic.
Advanced
In order to see how different services may pick up spans and extend them, please
see the advanced example at examples/vaniallajs/advanced. You can run the
example with npm run example:advanced.