[tonytonycoder11]

Stacked on #12: its commits are in this branch, and GitHub moves the base to main when #12 is merged. The diff here is the decoders, plus the two commits at the end, which the last paragraph describes.

Protobuf and MessagePack bodies were a hex dump unless the app wrote a decoder. Both now have one, and the inspector registers the ones that need no schema.

MessagePack describes itself, so a body whose media type says MessagePack (application/msgpack, application/x-msgpack, application/vnd.msgpack, a +msgpack suffix) is shown as indented text with no setup. Integers keep every digit up to 64 bits, bytes are hex, a map with keys that are not strings has them written as text, and the timestamp extension is an ISO 8601 date.

Protobuf has two modes:

• With FlutwireProtobufDecoder(descriptorSet: ...), which takes the descriptor set that protoc writes with --descriptor_set_out and --include_imports: fields by name and type, enums by name, maps as objects, packed and unpacked repeated numbers as lists, Timestamp and Duration as one string each, and fields the schema does not know by their number. messageType says which message a body is when it is not gRPC.
• Without a schema, which the inspector registers after the decoders the app listed: fields by number, with a length delimited field taken for text, a message or bytes the way protoc --decode_raw takes it.

A gRPC or gRPC-web call (application/grpc or application/grpc-web, with or without +proto) finds its message types from the method in its address, lists the messages of a stream and shows the trailers. A compressed message is marked as such, because the decoder has no algorithm to run.

Both decoders leave a body alone when it was cut or does not end where its last value does. They run when a body is opened, so the capture is untouched, and they are plain Dart with no dart:io, so they work on the web. The wire reader keeps 64 bit numbers exact by moving from int to BigInt past 2^53.

I could not cross-check the Protobuf side against protoc here, because the Homebrew build fails to load abseil. The tests use messages and descriptors encoded by hand from the encoding guide and descriptor.proto, including the guide's own examples. A descriptor set from a real API is worth one run before 0.2.0.

I tried it on an Android emulator with the example app, which has a MessagePack body and a Protobuf body now. All four suites pass, flutter analyze --fatal-infos is clean and the example builds for the web.

The last two commits come from a review of #12 and of this branch, and neither changes behaviour. One compiles three regular expressions once instead of on every call and copies a cut message once instead of twice. The other gives the three files that import dart:io and did not say so (websocket_reader, wire_socket and disk_store) the _io suffix that the other five carry.

Targets 0.2.0, Tier 2, M22.

[trueup-by-nacode-studios]

This pull request adds no capability the code did not already have.

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