Added pg and pgqueue

Author: djthorpe

go.mod

@@ -1,3 +1,25 @@
 module github.com/mutablelogic/go-server
 
 go 1.23.5
+
+require (
+	github.com/djthorpe/go-pg v1.0.1
+	github.com/stretchr/testify v1.10.0
+)
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/docker/go-connections v0.5.0 // indirect
+	github.com/jackc/pgpassfile v1.0.0 // indirect
+	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
+	github.com/jackc/pgx/v5 v5.7.2 // indirect
+	github.com/jackc/puddle/v2 v2.2.2 // indirect
+	github.com/kr/text v0.2.0 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/rogpeppe/go-internal v1.14.1 // indirect
+	github.com/testcontainers/testcontainers-go v0.35.0 // indirect
+	golang.org/x/crypto v0.31.0 // indirect
+	golang.org/x/sync v0.10.0 // indirect
+	golang.org/x/text v0.21.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

go.sum

@@ -0,0 +1,125 @@
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pkg/pgqueue/opt.go

@@ -0,0 +1,48 @@
+package pgqueue
+
+import (
+	"strings"
+
+	// Packages
+	"github.com/mutablelogic/go-server/pkg/httpresponse"
+)
+
+////////////////////////////////////////////////////////////////////////////////
+// TYPES
+
+type opt struct {
+	worker string
+}
+
+// Opt represents a function that modifies the options
+type Opt func(*opt) error
+
+////////////////////////////////////////////////////////////////////////////////
+// LIFECYCLE
+
+func applyOpts(opts ...Opt) (*opt, error) {
+	var o opt
+
+	// Apply the options
+	for _, fn := range opts {
+		if err := fn(&o); err != nil {
+			return nil, err
+		}
+	}
+
+	// Return success
+	return &o, nil
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// PUBLIC METHODS
+
+func OptWorker(worker string) Opt {
+	return func(o *opt) error {
+		if worker = strings.TrimSpace(worker); worker == "" {
+			return httpresponse.ErrBadRequest.With("empty worker name")
+		}
+		o.worker = worker
+		return nil
+	}
+}

pkg/pgqueue/pgqueue.go

@@ -0,0 +1,78 @@
+package pgqueue
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"strings"
+
+	// Packages
+	pg "github.com/djthorpe/go-pg"
+	httpresponse "github.com/mutablelogic/go-server/pkg/httpresponse"
+	schema "github.com/mutablelogic/go-server/pkg/pgqueue/schema"
+)
+
+////////////////////////////////////////////////////////////////////////////////
+// TYPES
+
+type Client struct {
+	conn     pg.PoolConn
+	listener pg.Listener
+	topics   []string
+	worker   string
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// LIFECYCLE
+
+func New(ctx context.Context, conn pg.PoolConn, opt ...Opt) (*Client, error) {
+	self := new(Client)
+	opts, err := applyOpts(opt...)
+	if err != nil {
+		return nil, err
+	}
+
+	// Create a listener
+	if listener := pg.NewListener(conn); listener == nil {
+		return nil, httpresponse.ErrInternalError.Withf("Cannot create listener")
+	} else {
+		self.listener = listener
+		self.topics = []string{schema.TopicQueueInsert}
+	}
+
+	// Set worker name
+	if worker := strings.TrimSpace(opts.worker); worker != "" {
+		self.worker = worker
+	} else if hostname, err := os.Hostname(); err != nil {
+		return nil, httpresponse.ErrInternalError.With(err)
+	} else {
+		self.worker = fmt.Sprint(hostname, ".", os.Getpid())
+	}
+
+	// If the schema does not exist, then bootstrap it
+	if err := self.conn.Tx(ctx, func(conn pg.Conn) error {
+		if exists, err := pg.SchemaExists(ctx, conn, schema.SchemaName); err != nil {
+			return err
+		} else if !exists {
+			return schema.Bootstrap(ctx, conn)
+		}
+		return nil
+	}); err != nil {
+		return nil, err
+	}
+
+	// Return success
+	return self, nil
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// PUBLIC METHODS
+
+func (client *Client) CreateQueue(ctx context.Context, meta schema.Queue) error {
+	if err := client.conn.Tx(ctx, func(conn pg.Conn) error {
+		return client.conn.Insert(ctx, meta)
+	}); err != nil {
+		return err
+	}
+	return nil
+}