rt

rt: Ripta's collection of tools

Expectations:

• tools read from STDIN, write to STDOUT, and hopefully print errors to STDERR;
• tools are meant to be combined with others, e.g., hs might be less useful to you, because it prints file hashes in binary output instead of hex (but enc hex converts it to hex strings).

Alphabetical list of said tools:

• enc to encode and decode STDIN
• grpcto to frame and unframe gRPC messages
• hs to hash STDIN
• place for macOS Location Services
• streamdiff to help you pick out field changes off a stream of JSON
• toto to inspect some protobuf messages
• uni for unicode utils
• yfmt to reindent YAML while preserving comments

Pull requests welcome, though you should probably check first before sinking any time.

enc

go install github.com/ripta/rt/cmd/enc@latest

Encode and decode strings using various encodings:

• a85 for ascii85;
• b32 for base32;
• b58 for base58;
• b64 for base64;
• hex for hexadecimal; and
• url for URL escape/unescape.

hs

go install github.com/ripta/rt/cmd/hs@latest

Hash the input and print the resulting hash in binary bytes. Run with -h to see the list of supported hash functions that are compiled into the binary, which is approximately:

• sha1 for SHA-1;
• sha224 for SHA-224;
• sha256 for SHA-256;
• sha3 for SHA-3/512;
• sha384 for SHA-384; and
• sha512 for SHA-512.

To output hexadecimal, pipe the output to enc hex. My knowledge graph uses a different representation for hashes, so it's useful to me to not have the hex representation.

❯ head -n 2 hamlet.txt
To be, or not to be: that is the question:
Whether 'tis nobler in the mind to suffer

❯ cat hamlet.txt | hs sha256 | enc hex
e26671d53d74b6751373ad34768580af77847aa1513203d9a06c292617ab5c4b%

❯ cat hamlet.txt | hs sha256 | enc base64
4mZx1T10tnUTc600doWAr3eEeqFRMgPZoGwpJherXEs=%

(ICYDK, that % at the end is zsh's PROMPT_EOL_MARK.)

grpcto

go install github.com/ripta/rt/cmd/grpcto@latest

Frame and unframe raw bytes in a gRPC envelope. For example, assuming a proto message crafted using either toto (included in this repo) or protoc --encode (the official protobuf compiler), you can frame the message using:

echo 'hello:"world"' \
    | protoc --encode foo.bar.v1.Thing ./thing.proto \
    | grpcto frame > message.raw

where the resulting message.raw can be sent directly to a running gRPC service using curl:

curl -X POST --data-binary @message.raw -o response.raw -H 'content-type: application/grpc' --raw https://localhost:8443/foo.bar.v1.Thinger/Thing

and the response.raw can be unframed and decoded using protoc:

cat response.raw \
    | grpcto unframe \
    | protoc --decode_raw

place

Talk to macOS Location Services from the command line.

go install github.com/ripta/rt/cmd/place@latest

Query as plaintext:

❯ place
Latitude: 34.009414
Longitude: -118.162233
Accuracy: 45.751999
Last observed: 2022-02-02T21:24:40-08:00

or as JSON by giving -j or --json.

streamdiff

Helps you pick out field changes off a stream of JSON.

go install github.com/ripta/rt/cmd/streamdiff@latest

It's technically usable on any stream as long as the format is one JSON per line.

It's convenient for viewing Kubernetes resource changes over time.

For example, you can start a watch (-w) on pods (kubectl get pods) and pipe it to streamdiff. Most fields won't be printed, except when they change. Consider this output:

❯ kubectl get pods -o json -w | streamdiff
T+23s Pod:pomerium-cache-6c9f84b747-cr2rx
  (1/2): spec.nodeName \ -> gke-vqjp-preemptible-065-38c45f41-wtnb
  (2/2): status.conditions \ -> [map[lastProbeTime:<nil> lastTransitionTime:2023-06-22T06:27:43Z status:True type:PodScheduled]]

T+24s Pod:pomerium-cache-6c9f84b747-cr2rx
  (1/6): status.conditions.0 \ -> map[lastProbeTime:<nil> lastTransitionTime:2023-06-22T06:27:43Z status:True type:Initialized]
  (2/6): status.conditions.1 \ -> map[lastProbeTime:<nil> lastTransitionTime:2023-06-22T06:27:43Z message:containers with unready status: [cache] reason:ContainersNotReady status:False type:Ready]
  (3/6): status.conditions.2 \ -> map[lastProbeTime:<nil> lastTransitionTime:2023-06-22T06:27:43Z message:containers with unready status: [cache] reason:ContainersNotReady status:False type:ContainersReady]
  (4/6): status.startTime \ -> 2023-06-22T06:27:43Z
  (5/6): status.containerStatuses \ -> [map[image:us.gcr.io/dc-02/gke-vqjp/pomerium-cache:v1.0.23.1390 imageID: lastState:map[] name:cache ready:false restartCount:0 started:false state:map[waiting:map[reason:ContainerCreating]]]]
  (6/6): status.hostIP \ -> 10.52.0.34

T+26s Pod:pomerium-cache-6c9f84b747-cr2rx
  (1/8): status.containerStatuses.0.ready false -> true
  (2/8): status.containerStatuses.0.started false -> true
  (3/8): status.containerStatuses.0.state.waiting map[reason:ContainerCreating] -> \
  (4/8): status.containerStatuses.0.state.running \ -> map[startedAt:2023-06-22T06:27:46Z]
  (5/8): status.containerStatuses.0.containerID \ -> containerd://293972feb5b498c80a585137299990c77f44ea46d6236432aba08e72108c35dc
  (6/8): status.phase Pending -> Running
  (7/8): status.podIP \ -> 10.53.1.92
  (8/8): status.podIPs \ -> [map[ip:10.53.1.92]]

While there is still some noise, it clearly shows when the pod was assigned to a node, when the pod finished initializing, and when it changed phases from Pending to Running.

In addition to a running log (as above), you can also run streamdiff -i, which updates status on the same line instead of printing a new line for every resource update. YMMV.

❯ kubectl get nodes -o json -w | streamdiff -i
\ Node:gke-vqjp-ondemand-370-504f82ce-r0d8	status.conditions.0.{type: FrequentContainerdRestart; status: True -> False} 
\ Node:gke-vqjp-preemptible-065-38c45f41-kvjd	status.conditions.0.lastHeartbeatTime: 2023-06-22T06:44:18Z -> 2023-06-22T06:49:19Z
| Node:gke-vqjp-preemptible-065-38c45f41-pklf	status.conditions.0.lastHeartbeatTime: 2023-06-22T06:44:15Z -> 2023-06-22T06:49:16Z
/ Node:gke-vqjp-preemptible-065-38c45f41-wtnb	status.conditions.0.lastHeartbeatTime: 2023-06-22T06:45:05Z -> 2023-06-22T06:50:11Z

toto

Some dynamic protobuf inspection tools.

go install github.com/ripta/rt/cmd/toto@latest

You can build file descriptor set, and use protoc to inspect it:

toto compile samples
cat samples/.file_descriptor_set | protoc --decode_raw

Or generate an example protobuf message and dynamically convert it to json:

toto sample | toto recode -p samples/.file_descriptor_set -f json samples.data.v1.Envelope

The toto compile step is necessary, because you can't currently parse proto files directly in go (or at least, I wasn't able to).

uni

Unicode-related stuff.

go install github.com/ripta/rt/cmd/uni@latest

List characters:

❯ uni list java cecak
U+A981 	ꦁ	[EA A6 81   ]	<M,Mn>	JAVANESE SIGN CECAK
U+A9B3 	꦳	[EA A6 B3   ]	<M,Mn>	JAVANESE SIGN CECAK TELU

List characters with fewer details:

❯ uni list java cecak -o hexbytes,name
[EA A6 81   ]	JAVANESE SIGN CECAK
[EA A6 B3   ]	JAVANESE SIGN CECAK TELU

Show only the aggregate count (-c), skipping output (-o none):

❯ uni list java cecak -o none -c
Matched 2 runes

Show only characters in a specific character category, e.g.:

# All "Pd" (punctuation, dash)
❯ uni list -C Pd

# All "S" (symbols)
❯ uni list -C S

# All "N" (numbers) that aren't "No" (other)
❯ uni list -C N,!No

# All "Lu" (letters, uppercase) and "Ll" (letters, lowercase)
❯ uni list -C Lu,Ll

List all character categories, their names, and counts:

❯ uni cats
KEY   NAME                    RUNE COUNT
C     Other                   139751
Cc    Control                 65
Cf    Format                  170
Co    Private Use             137468
[...]

Describe characters:

❯ echo 𝗀𝘨| uni describe
U+1D5C0	𝗀	MATHEMATICAL SANS-SERIF SMALL G
U+1D628	𝘨	MATHEMATICAL SANS-SERIF ITALIC SMALL G
U+000A	"\n"	<control>

Map characters for fun:

❯ echo Hello World | uni map smallcaps
Hᴇʟʟᴏ Wᴏʀʟᴅ

❯ echo Hello World | uni map italics
𝐻𝑒𝑙𝑙𝑜 𝑊𝑜𝑟𝑙𝑑

Canonically compose runes:

❯ echo 감 | uni nfc
감

❯ echo 감 | uni nfd
감

Sometimes it may be useful to decompose runes before describing:

❯ echo 쭈꾸쭈꾸 | uni d
U+CB48	쭈	<Hangul Syllable>
U+AFB8	꾸	<Hangul Syllable>
U+CB48	쭈	<Hangul Syllable>
U+AFB8	꾸	<Hangul Syllable>
U+000A	"\n"	<control>

❯ echo 쭈꾸쭈꾸 | uni nfd | uni describe
U+110D	ᄍ	HANGUL CHOSEONG SSANGCIEUC
U+116E	ᅮ	HANGUL JUNGSEONG U
U+1101	ᄁ	HANGUL CHOSEONG SSANGKIYEOK
U+116E	ᅮ	HANGUL JUNGSEONG U
U+110D	ᄍ	HANGUL CHOSEONG SSANGCIEUC
U+116E	ᅮ	HANGUL JUNGSEONG U
U+1101	ᄁ	HANGUL CHOSEONG SSANGKIYEOK
U+116E	ᅮ	HANGUL JUNGSEONG U
U+000A	"\n"	<control>

Sort input with different collation (-l):

❯ cat input.txt
Œthelwald
Zeus
Achilles

❯ cat input.txt | uni sort -l en-US
Achilles
Œthelwald
Zeus

❯ cat input.txt | uni sort -l da
Achilles
Zeus
Œthelwald

❯ cat input.txt | uni sort -l da -r
Œthelwald
Zeus
Achilles

yfmt

Reindent YAML while preserving comments.

go install github.com/ripta/rt/cmd/yfmt@latest

This tool treats comments as nodes and therefore will not preserve comment indentation. For example:

❯ cat in.yaml
# does this work?
foo:
   - 123   # I hope
           # maybe
   - 456

❯ yfmt < in.yaml
# does this work?
foo:
  - 123 # I hope
  # maybe
  - 456