set up project
This commit is contained in:
commit
eea30c7318
9
.gitignore
vendored
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9
.gitignore
vendored
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@ -0,0 +1,9 @@
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# development environment
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.envrc
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.direnv
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# postgres
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postgres.db
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postgres.log
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.s.PGSQL.5432*
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27
flake.lock
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27
flake.lock
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@ -0,0 +1,27 @@
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{
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"nodes": {
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"nixpkgs": {
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"locked": {
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"lastModified": 1742272065,
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"narHash": "sha256-ud8vcSzJsZ/CK+r8/v0lyf4yUntVmDq6Z0A41ODfWbE=",
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"owner": "NixOS",
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"repo": "nixpkgs",
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"rev": "3549532663732bfd89993204d40543e9edaec4f2",
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"type": "github"
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},
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"original": {
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"owner": "NixOS",
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"ref": "nixpkgs-unstable",
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"repo": "nixpkgs",
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"type": "github"
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}
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},
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"root": {
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"inputs": {
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"nixpkgs": "nixpkgs"
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}
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}
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},
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"root": "root",
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"version": 7
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}
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76
flake.nix
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76
flake.nix
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@ -0,0 +1,76 @@
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{
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inputs = {
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nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
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};
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outputs = {
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self,
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nixpkgs,
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...
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}: let
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# System types to support.
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supportedSystems = ["x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin"];
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# Helper function to generate an attrset '{ x86_64-linux = f "x86_64-linux"; ... }'.
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forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
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# Nixpkgs instantiated for supported system types.
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nixpkgsFor = forAllSystems (system: import nixpkgs {inherit system;});
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in {
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devShells = forAllSystems (system: let
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pkgs = nixpkgsFor.${system};
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startPostgres = pkgs.writeScriptBin "postgres_start" ''
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background() {
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exec 0>&-
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exec 1>&-
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exec 2>&-
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exec 3>&-
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"$@" &
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disown $!
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}
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echo "Starting postgres server..."
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# start postgres server
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background ${pkgs.postgresql}/bin/pg_ctl -l $DB_LOG -o "--unix_socket_directories='$PWD'" start
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echo "Postgres server started."
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'';
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in {
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default = pkgs.mkShell {
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buildInputs = with pkgs; [go gopls gotools go-tools postgresql];
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PGDATA = "postgres.db";
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DB_LOG = "postgres.log";
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DB_NAME = "vegan-barcode";
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shellHook = ''
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echo "Using ${pkgs.postgresql.name}."
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create_db=0
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# initialize postgres if we have not done so already
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if [ ! -d $PGDATA ]; then
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echo "Postgres not found. Initializing postgres at $PGDATA"
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${pkgs.postgresql}/bin/initdb > /dev/null
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echo "Setting postgres unix socket directories to $PWD/$SOCKET_DIRECTORIES..."
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echo "unix_socket_directories = '$PWD'" >> $PGDATA/postgresql.conf
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echo "unix socket directories set."
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echo "Creating database $DB_NAME..."
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echo "CREATE DATABASE \"$DB_NAME\";" | postgres --single -E postgres
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echo "Database created."
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fi
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export PGHOST="$PWD"
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if [ ! -f "$PWD/.s.PGSQL.5432.lock" ]; then
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${startPostgres}/bin/postgres_start
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fi
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'';
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};
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});
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# The default package for 'nix build'. This makes sense if the
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# flake provides only one package or there is a clear "main"
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# package.
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defaultPackage = forAllSystems (system: self.packages.${system}.go-hello);
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};
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}
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17
go.mod
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17
go.mod
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module vegan-barcode/backend
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go 1.24.1
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require github.com/jackc/pgx v3.6.2+incompatible
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require (
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github.com/jackc/pgpassfile v1.0.0 // indirect
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github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
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)
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require (
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github.com/jackc/pgx/v5 v5.7.4
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github.com/pkg/errors v0.9.1 // indirect
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golang.org/x/crypto v0.36.0 // indirect
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golang.org/x/text v0.23.0 // indirect
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)
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21
go.sum
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21
go.sum
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@ -0,0 +1,21 @@
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github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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github.com/jackc/pgpassfile v1.0.0 h1:/6Hmqy13Ss2zCq62VdNG8tM1wchn8zjSGOBJ6icpsIM=
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github.com/jackc/pgpassfile v1.0.0/go.mod h1:CEx0iS5ambNFdcRtxPj5JhEz+xB6uRky5eyVu/W2HEg=
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github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 h1:iCEnooe7UlwOQYpKFhBabPMi4aNAfoODPEFNiAnClxo=
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github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761/go.mod h1:5TJZWKEWniPve33vlWYSoGYefn3gLQRzjfDlhSJ9ZKM=
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github.com/jackc/pgx v3.6.2+incompatible h1:2zP5OD7kiyR3xzRYMhOcXVvkDZsImVXfj+yIyTQf3/o=
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github.com/jackc/pgx v3.6.2+incompatible/go.mod h1:0ZGrqGqkRlliWnWB4zKnWtjbSWbGkVEFm4TeybAXq+I=
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github.com/jackc/pgx/v5 v5.7.4 h1:9wKznZrhWa2QiHL+NjTSPP6yjl3451BX3imWDnokYlg=
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github.com/jackc/pgx/v5 v5.7.4/go.mod h1:ncY89UGWxg82EykZUwSpUKEfccBGGYq1xjrOpsbsfGQ=
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github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
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github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
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github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
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github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
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github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
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github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
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golang.org/x/crypto v0.36.0 h1:AnAEvhDddvBdpY+uR+MyHmuZzzNqXSe/GvuDeob5L34=
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golang.org/x/crypto v0.36.0/go.mod h1:Y4J0ReaxCR1IMaabaSMugxJES1EpwhBHhv2bDHklZvc=
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golang.org/x/text v0.23.0 h1:D71I7dUrlY+VX0gQShAThNGHFxZ13dGLBHQLVl1mJlY=
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golang.org/x/text v0.23.0/go.mod h1:/BLNzu4aZCJ1+kcD0DNRotWKage4q2rGVAg4o22unh4=
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gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
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gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
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14
shell.nix
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14
shell.nix
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@ -0,0 +1,14 @@
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(
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import
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(
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let
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lock = builtins.fromJSON (builtins.readFile ./flake.lock);
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in
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fetchTarball {
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url = lock.nodes.flake-compat.locked.url or "https://github.com/edolstra/flake-compat/archive/${lock.nodes.flake-compat.locked.rev}.tar.gz";
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sha256 = lock.nodes.flake-compat.locked.narHash;
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}
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)
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{src = ./.;}
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)
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.shellNix
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29
src/database/database.go
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29
src/database/database.go
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package main
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import (
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"context"
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"fmt"
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"os"
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"github.com/jackc/pgx/v5"
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)
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func main() {
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// urlExample := "postgres://username:password@localhost:5432/database_name"
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conn, err := pgx.Connect(context.Background(), os.Getenv("PGHOST"))
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if err != nil {
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fmt.Fprintf(os.Stderr, "Unable to connect to database: %v\n", err)
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os.Exit(1)
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}
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defer conn.Close(context.Background())
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var name string
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var weight int64
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err = conn.QueryRow(context.Background(), "select name, weight from widgets where id=$1", 42).Scan(&name, &weight)
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if err != nil {
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fmt.Fprintf(os.Stderr, "QueryRow failed: %v\n", err)
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os.Exit(1)
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}
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fmt.Println(name, weight)
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}
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