odigos-io / offsets-tracker Goto Github PK

We can reduce the size of offset_results.json file by using version ranges for versions with the same offset.
For example, instead of writing:

{
      "struct": "google.golang.org/grpc/internal/transport.Stream",
      "field_name": "method",
      "offsets": [
        {
          "offset": 72,
          "version": "v1.0.2"
        },
        {
          "offset": 72,
          "version": "v1.0.3"
        },
        {
          "offset": 72,
          "version": "v1.0.4"
        }]
}

We can write:

{
      "struct": "google.golang.org/grpc/internal/transport.Stream",
      "field_name": "method",
      "offsets": [
        {
          "offset": 72,
          "min_version": "v1.0.2"
          "nax_version": "v1.0.4"
        }]
}

DWARF includes information on the stack offsets of function arguments.
Tracking those offsets will make writing eBPF based instrumentation much easier.

Currently, offsets-tracker invokes the process go list -versions for discovering Go standard library versions.
This makes us dependent on the Go binary.
We probably can replace this process invocation with Go code (which can be found in the offical Go repository)

Is it possible to run this just based on my local Go version, rather than downloading them remotely? It would be nice to auto-detect what version I'm running (or for example, when running an app in a golang container) and make this part of the build stage for adding otel auto-instrumentation to an app.