docs: add client spec for x/slashing (#10307)

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## Description

Closes: #10291 

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---

### Author Checklist

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- [x] included the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] added `!` to the type prefix if API or client breaking change
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- [ ] included the necessary unit and integration [tests](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#testing)
- [ ] added a changelog entry to `CHANGELOG.md`
- [ ] included comments for [documenting Go code](https://blog.golang.org/godoc)
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- [ ] confirmed `!` in the type prefix if API or client breaking change
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Prathyusha Lakkireddy 2021-10-06 17:10:03 +05:30 committed by GitHub
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## CLI
A user can query and interact with the `slashing` module using the CLI.
### Query
The `query` commands allow users to query `slashing` state.
```bash
simd query slashing --help
```
#### params
The `params` command allows users to query genesis parameters for the slashing module.
```bash
simd query slashing params [flags]
```
Example:
```bash
simd query slashing params
```
Example Output:
```bash
downtime_jail_duration: 600s
min_signed_per_window: "0.500000000000000000"
signed_blocks_window: "100"
slash_fraction_double_sign: "0.050000000000000000"
slash_fraction_downtime: "0.010000000000000000"
```
#### signing-info
The `signing-info` command allows users to query signing-info of the validator using consensus public key.
```bash
simd query slashing signing-infos [flags]
```
Example:
```bash
simd query slashing signing-info '{"@type":"/cosmos.crypto.ed25519.PubKey","key":"Auxs3865HpB/EfssYOzfqNhEJjzys6jD5B6tPgC8="}'
```
Example Output:
```bash
address: cosmosvalcons1nrqsld3aw6lh6t082frdqc84uwxn0t958c
index_offset: "2068"
jailed_until: "1970-01-01T00:00:00Z"
missed_blocks_counter: "0"
start_height: "0"
tombstoned: false
```
#### signing-infos
The `signing-infos` command allows users to query signing infos of all validators.
```bash
simd query slashing signing-infos [flags]
```
Example:
```bash
simd query slashing signing-infos
```
Example Output:
```bash
info:
- address: cosmosvalcons1nrqsld3aw6lh6t082frdqc84uwxn0t958c
index_offset: "2075"
jailed_until: "1970-01-01T00:00:00Z"
missed_blocks_counter: "0"
start_height: "0"
tombstoned: false
pagination:
next_key: null
total: "0"
```
### Transactions
The `tx` commands allow users to interact with the `slashing` module.
```bash
simd tx slashing --help
```
#### unjail
The `unjail` command allows users to unjail a validator previously jailed for downtime.
```bash
simd tx slashing unjail --from mykey [flags]
```
Example:
```bash
simd tx slashing unjail --from mykey
```
## gRPC
A user can query the `slashing` module using gRPC endpoints.
### Params
The `Params` endpoint allows users to query the parameters of slashing module.
```bash
cosmos.slashing.v1beta1.Query/Params
```
Example:
```bash
grpcurl -plaintext localhost:9090 cosmos.slashing.v1beta1.Query/Params
```
Example Output:
```bash
{
"params": {
"signedBlocksWindow": "100",
"minSignedPerWindow": "NTAwMDAwMDAwMDAwMDAwMDAw",
"downtimeJailDuration": "600s",
"slashFractionDoubleSign": "NTAwMDAwMDAwMDAwMDAwMDA=",
"slashFractionDowntime": "MTAwMDAwMDAwMDAwMDAwMDA="
}
}
```
### SigningInfo
The SigningInfo queries the signing info of given cons address.
```bash
cosmos.slashing.v1beta1.Query/SigningInfo
```
Example:
```bash
grpcurl -plaintext -d '{"cons_address":"cosmosvalcons1nrqsld3aw6lh6t082frdqc84uwxn0t958c"}' localhost:9090 cosmos.slashing.v1beta1.Query/SigningInfo
```
Example Output:
```bash
{
"valSigningInfo": {
"address": "cosmosvalcons1nrqsld3aw6lh6t082frdqc84uwxn0t958c",
"indexOffset": "3493",
"jailedUntil": "1970-01-01T00:00:00Z"
}
}
```
### SigningInfos
The SigningInfos queries signing info of all validators.
```bash
cosmos.slashing.v1beta1.Query/SigningInfos
```
Example:
```bash
grpcurl -plaintext localhost:9090 cosmos.slashing.v1beta1.Query/SigningInfos
```
Example Output:
```bash
{
"info": [
{
"address": "cosmosvalcons1nrqslkwd3pz096lh6t082frdqc84uwxn0t958c",
"indexOffset": "2467",
"jailedUntil": "1970-01-01T00:00:00Z"
}
],
"pagination": {
"total": "1"
}
}
```
## REST
A user can query the `slashing` module using REST endpoints.
### Params
```bash
/cosmos/slashing/v1beta1/params
```
Example:
```bash
curl "localhost:1317/cosmos/slashing/v1beta1/params"
```
Example Output:
```bash
{
"params": {
"signed_blocks_window": "100",
"min_signed_per_window": "0.500000000000000000",
"downtime_jail_duration": "600s",
"slash_fraction_double_sign": "0.050000000000000000",
"slash_fraction_downtime": "0.010000000000000000"
}
```
### signing_info
```bash
/cosmos/slashing/v1beta1/signing_infos/%s
```
Example:
```bash
curl "localhost:1317/cosmos/slashing/v1beta1/signing_infos/cosmosvalcons1nrqslkwd3pz096lh6t082frdqc84uwxn0t958c"
```
Example Output:
```bash
{
"val_signing_info": {
"address": "cosmosvalcons1nrqslkwd3pz096lh6t082frdqc84uwxn0t958c",
"start_height": "0",
"index_offset": "4184",
"jailed_until": "1970-01-01T00:00:00Z",
"tombstoned": false,
"missed_blocks_counter": "0"
}
}
```
### signing_infos
```bash
/cosmos/slashing/v1beta1/signing_infos
```
Example:
```bash
curl "localhost:1317/cosmos/slashing/v1beta1/signing_infos
```
Example Output:
```bash
{
"info": [
{
"address": "cosmosvalcons1nrqslkwd3pz096lh6t082frdqc84uwxn0t958c",
"start_height": "0",
"index_offset": "4169",
"jailed_until": "1970-01-01T00:00:00Z",
"tombstoned": false,
"missed_blocks_counter": "0"
}
],
"pagination": {
"next_key": null,
"total": "1"
}
}
```

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7. **[Staking Tombstone](07_tombstone.md)**
- [Abstract](07_tombstone.md#abstract)
8. **[Parameters](08_params.md)**
9. **[Client](09_client.md)**
- [CLI](09_client.md#cli)
- [gRPC](09_client.md#grpc)
- [REST](09_client.md#rest)