mallinfo to LightDB Stream

The Struct-to-JSON transformer can be used to convert structured binary data, such as that created by packed C structs, into JSON, according to a user provided schema. Sending structured binary data from the device is particularly suited to cases where bandwidth is severely constrained, the data is in a well-defined standard format, or the structure of the data is unlikely to change.

This example demonstrates converting data returned by a call to mallinfo2() on a 64-bit Linux system into JSON for ingestion into LightDB Stream, where the data can be analyzed to assess dynamic memory usage of the program. As the data returned by mallinfo2() is both well-defined and unlikely to change structure, this data is a good candidate for sending as structured binary data, saving bandwidth and CPU cycles on the embedded device.

Pipeline: mallinfo

filter:
  path: "/mallinfo"
  content_type: application/octet-stream
steps:
  - name: step0
    transformer:
      type: struct-to-json
      version: v1
      parameters:
        members:
          - name: arena
            type: u64
          - name: ordblks
            type: u64
          - name: smblks
            type: u64
          - name: hblks
            type: u64
          - name: hblkhd
            type: u64
          - name: usmblks
            type: u64
          - name: fsmblks
            type: u64
          - name: uordblks
            type: u64
          - name: fordblks
            type: u64
          - name: keepcost
            type: u64
    destination:
      type: lightdb-stream
      version: v1