github.com/jackc/pgservicefile v0.0.0-20200714003250-2b9c44734f2b: Service

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify github.com/jackc/pgservicefile.Service in pkg:golang/github.com/jackc/pgservicefile@v0.0.0-20200714003250-2b9c44734f2b
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/github.com/jackc/pgservicefile@v0.0.0-20200714003250-2b9c44734f2b
Demonstrate these symbols/APIs:
  - github.com/jackc/pgservicefile.Service

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:e83cc88d293c608e28f4598a3ee7a1990bb8076a945ccd6c599fc380214bd5e7","contract":["pgservicefile.Service struct holds a Name string and a Settings map[string]string.","pgservicefile.ParseServicefile creates a Service instance with the parsed section Name.","pgservicefile.Service.Settings contains the key-value pairs from the parsed section.","pgservicefile.Servicefile.GetService returns a pointer to the matching Service.","pgservicefile.Service struct fields can be directly accessed and modified."],"goal":"verify github.com/jackc/pgservicefile.Service in pkg:golang/github.com/jackc/pgservicefile@v0.0.0-20200714003250-2b9c44734f2b","kind":"HOW","packages":["pkg:golang/github.com/jackc/pgservicefile@v0.0.0-20200714003250-2b9c44734f2b"],"schemaVersion":1,"symbols":["github.com/jackc/pgservicefile.Service"]},"contractCommand":["go","run","./test"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/github.com/jackc/pgservicefile@v0.0.0-20200714003250-2b9c44734f2b"],"schemaVersion":1,"subject":"pkg:golang/github.com/jackc/pgservicefile@v0.0.0-20200714003250-2b9c44734f2b","symbols":["github.com/jackc/pgservicefile.Service"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.22

require github.com/jackc/pgservicefile v0.0.0-20200714003250-2b9c44734f2b

github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/jackc/pgservicefile v0.0.0-20200714003250-2b9c44734f2b h1:C8S2+VttkHFdOOCXJe+YGfa4vHYwlt4Zx+IVXQ97jYg=
github.com/jackc/pgservicefile v0.0.0-20200714003250-2b9c44734f2b/go.mod h1:vsD4gTJCa9TptPL8sPkXrLZ+hDuNrZCnj29CQpr4X1E=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.5.1 h1:nOGnQDM7FYENwehXlg/kFVnos3rEvtKTjRvOWSzb6H4=
github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

package main

import (
	"fmt"
	"strings"

	"github.com/jackc/pgservicefile"
)

func main() {
	content := `[mydb]
host=localhost
port=5432
user=appuser
dbname=testdb
`
	servicefile, err := pgservicefile.ParseServicefile(strings.NewReader(content))
	if err != nil {
		panic(err)
	}

	service, err := servicefile.GetService("mydb")
	if err != nil {
		panic(err)
	}

	fmt.Printf("Service: %s\n", service.Name)
	fmt.Printf("Host: %s\n", service.Settings["host"])
	fmt.Printf("Port: %s\n", service.Settings["port"])
	fmt.Printf("User: %s\n", service.Settings["user"])
	fmt.Printf("DBName: %s\n", service.Settings["dbname"])
}

{
  "schemaVersion": 1,
  "goal": "verify github.com/jackc/pgservicefile.Service in pkg:golang/github.com/jackc/pgservicefile@v0.0.0-20200714003250-2b9c44734f2b",
  "kind": "HOW",
  "packages": [
    "pkg:golang/github.com/jackc/pgservicefile@v0.0.0-20200714003250-2b9c44734f2b"
  ],
  "symbols": [
    "github.com/jackc/pgservicefile.Service"
  ]
}

package main

import (
	"fmt"
	"os"
	"strings"

	"github.com/jackc/pgservicefile"
)

func main() {
	// Assertion 1: pgservicefile.Service struct holds a Name string and a Settings map[string]string.
	directSvc := pgservicefile.Service{
		Name: "custom",
		Settings: map[string]string{
			"host": "localhost",
			"port": "5432",
		},
	}
	if directSvc.Name != "custom" {
		fmt.Fprintf(os.Stderr, "FAIL: expected Name custom, got %s\n", directSvc.Name)
		os.Exit(1)
	}
	if directSvc.Settings["host"] != "localhost" || directSvc.Settings["port"] != "5432" {
		fmt.Fprintf(os.Stderr, "FAIL: unexpected direct settings content\n")
		os.Exit(1)
	}

	// Assertion 2: pgservicefile.ParseServicefile creates a Service instance with the parsed section Name.
	input := `# Comment line
[primary_db]
host = db.example.com
port = 5432
dbname = analytics
user = app_user

[replica_db]
host = replica.example.com
port = 5433
dbname = analytics
user = read_only_user
`
	sf, err := pgservicefile.ParseServicefile(strings.NewReader(input))
	if err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: ParseServicefile failed: %v\n", err)
		os.Exit(1)
	}
	if len(sf.Services) != 2 {
		fmt.Fprintf(os.Stderr, "FAIL: expected 2 services, got %d\n", len(sf.Services))
		os.Exit(1)
	}
	if sf.Services[0].Name != "primary_db" {
		fmt.Fprintf(os.Stderr, "FAIL: expected first service name primary_db, got %s\n", sf.Services[0].Name)
		os.Exit(1)
	}
	if sf.Services[1].Name != "replica_db" {
		fmt.Fprintf(os.Stderr, "FAIL: expected second service name replica_db, got %s\n", sf.Services[1].Name)
		os.Exit(1)
	}

	// Assertion 3: pgservicefile.Service.Settings contains the key-value pairs from the parsed section.
	svc0 := sf.Services[0]
	if svc0.Settings["host"] != "db.example.com" {
		fmt.Fprintf(os.Stderr, "FAIL: expected host db.example.com, got %s\n", svc0.Settings["host"])
		os.Exit(1)
	}
	if svc0.Settings["port"] != "5432" {
		fmt.Fprintf(os.Stderr, "FAIL: expected port 5432, got %s\n", svc0.Settings["port"])
		os.Exit(1)
	}
	if svc0.Settings["dbname"] != "analytics" {
		fmt.Fprintf(os.Stderr, "FAIL: expected dbname analytics, got %s\n", svc0.Settings["dbname"])
		os.Exit(1)
	}
	if svc0.Settings["user"] != "app_user" {
		fmt.Fprintf(os.Stderr, "FAIL: expected user app_user, got %s\n", svc0.Settings["user"])
		os.Exit(1)
	}

	// Assertion 4: pgservicefile.Servicefile.GetService returns a pointer to the matching Service.
	retrieved, err := sf.GetService("primary_db")
	if err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: GetService returned error: %v\n", err)
		os.Exit(1)
	}
	if retrieved != svc0 {
		fmt.Fprintf(os.Stderr, "FAIL: GetService did not return exact Service pointer\n")
		os.Exit(1)
	}
	if retrieved.Name != "primary_db" {
		fmt.Fprintf(os.Stderr, "FAIL: retrieved Service Name mismatch: %s\n", retrieved.Name)
		os.Exit(1)
	}

	// Assertion 5: pgservicefile.Service struct fields can be directly accessed and modified.
	svc0.Settings["sslmode"] = "require"
	if svc0.Settings["sslmode"] != "require" {
		fmt.Fprintf(os.Stderr, "FAIL: modified setting not found\n")
		os.Exit(1)
	}
	svc0.Name = "renamed_db"
	if svc0.Name != "renamed_db" {
		fmt.Fprintf(os.Stderr, "FAIL: modified name mismatch\n")
		os.Exit(1)
	}

	fmt.Println("PASS: all pgservicefile.Service contract assertions passed.")
}