pdms: support primary/transfer api for scheduling and tso

[HuSharp]

What problem does this PR solve?

Issue Number: Ref #5766, #7519

What is changed and how does it work?

$ curl --location --request GET 'http://127.0.0.1:2379/pd/api/v2/ms/primary/tso'
"http://127.0.0.1:2382"%

$ curl --location --request POST 'http://127.0.0.1:2379/pd/api/v2/ms/primary/transfer/tso' \
--header 'Content-Type: text/plain' \
--data-raw '{
    "new_primary": "tso-0"
}'
"success"%

$ curl --location --request GET 'http://127.0.0.1:2379/pd/api/v2/ms/primary/tso'
"http://127.0.0.1:2384"

$ curl --location --request POST 'http://127.0.0.1:2379/pd/api/v2/ms/primary/transfer/tso' \
--header 'Content-Type: application/json' \
--data-raw '{
    "new_primary": ""
}'
"success"

$ curl --location --request GET 'http://127.0.0.1:2379/pd/api/v2/ms/primary/tso'
"http://127.0.0.1:2382"

the members info are

curl --location --request GET 'http://127.0.0.1:2379/pd/api/v2/ms/members/tso'

get

[
    {
        "name": "tso-0",
        "service-addr": "http://127.0.0.1:2384",
        "version": "v8.2.0-alpha-23-gdd72b9c19-dirty",
        "git-hash": "dd72b9c19707ccbdb1801d379b3982a7944df23f",
        "deploy-path": "/Users/pingcap/CS/PingCAP/pd/bin",
        "start-timestamp": 1715577605,
        "member-value": "ChtodHRwOi8vMTI3LjAuMC4xOjIzODQtMDAwMDAQp+L2iMCp3NUaGhVodHRwOi8vMTI3LjAuMC4xOjIzODQ="
    },
    {
        "name": "tso-1",
        "service-addr": "http://127.0.0.1:2386",
        "version": "v8.2.0-alpha-23-gdd72b9c19-dirty",
        "git-hash": "dd72b9c19707ccbdb1801d379b3982a7944df23f",
        "deploy-path": "/Users/pingcap/CS/PingCAP/pd/bin",
        "start-timestamp": 1715577605,
        "member-value": "ChtodHRwOi8vMTI3LjAuMC4xOjIzODYtMDAwMDAQj9ro5Yq9mY8mGhVodHRwOi8vMTI3LjAuMC4xOjIzODY="
    }
]

Check List

Tests

• Unit test
• Manual test (add detailed scripts or steps below)

Release note

None.

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[codecov]

Codecov Report

Attention: Patch coverage is 75.53648% with 57 lines in your changes are missing coverage. Please review.

Project coverage is 77.36%. Comparing base (2fabb74) to head (4d0598f).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8157      +/-   ##
==========================================
+ Coverage   77.34%   77.36%   +0.01%     
==========================================
  Files         471      471              
  Lines       61368    61588     +220     
==========================================
+ Hits        47466    47647     +181     
- Misses      10341    10367      +26     
- Partials     3561     3574      +13     

Flag	Coverage Δ
unittests	77.36% <75.53%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

[rleungx]

Shall we need a default name?

[HuSharp]

default name set by this code, which is like TSO-localhost

pd/pkg/mcs/tso/server/config.go

Lines 185 to 195 in a39300e

	func (c *Config) Adjust(meta *toml.MetaData) error {
	configMetaData := configutil.NewConfigMetadata(meta)
	if err := configMetaData.CheckUndecoded(); err != nil {
	c.WarningMsgs = append(c.WarningMsgs, err.Error())
	}
	if c.Name == "" {
	hostname, err := os.Hostname()
	if err != nil {
	return err
	}
	configutil.AdjustString(&c.Name, fmt.Sprintf("%s-%s", defaultName, hostname))

And your commented snippet is for testing to avoid using the same name for the same machine for local testing, I used addr here

pd/tests/testutil.go

Lines 87 to 88 in 51708b5

	cfg.Name = cfg.ListenAddr
	cfg, err := tso.GenerateConfig(cfg)

[rleungx]

got

[rleungx]

Will it only be used in ms?

[HuSharp]

For now, yes.

[rleungx]

Do we need to skip it in non-ms mode?

[HuSharp]

Maybe it's no problem that this code makes false negatives for non-ms mode.