improve logging functionality

go.mod

@@ -4,15 +4,13 @@ go 1.19
 
 require (
 	github.com/guregu/null v4.0.0+incompatible
-	github.com/jackc/pgconn v1.13.0
 	github.com/jackc/pgx/v5 v5.2.0
+	github.com/pkg/errors v0.9.1
+	golang.org/x/exp v0.0.0-20230213192124-5e25df0256eb
 )
 
 require (
-	github.com/jackc/chunkreader/v2 v2.0.1 // indirect
-	github.com/jackc/pgio v1.0.0 // indirect
 	github.com/jackc/pgpassfile v1.0.0 // indirect
-	github.com/jackc/pgproto3/v2 v2.3.1 // indirect
 	github.com/jackc/pgservicefile v0.0.0-20200714003250-2b9c44734f2b // indirect
 	github.com/jackc/puddle/v2 v2.1.2 // indirect
 	go.uber.org/atomic v1.10.0 // indirect

go.sum

@@ -1,148 +1,33 @@
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-golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/term v0.0.0-20201117132131-f5c789dd3221/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
-golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
-golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
-golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/text v0.3.4/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
 golang.org/x/text v0.3.8 h1:nAL+RVCQ9uMn3vJZbV+MRnydTJFPf8qqY42YiA6MrqY=
 golang.org/x/text v0.3.8/go.mod h1:E6s5w1FMmriuDzIBO73fBruAKo1PCIq6d2Q6DHfQ8WQ=
-golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
-golang.org/x/tools v0.0.0-20190425163242-31fd60d6bfdc/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
-golang.org/x/tools v0.0.0-20190823170909-c4a336ef6a2f/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
-golang.org/x/xerrors v0.0.0-20190410155217-1f06c39b4373/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20190513163551-3ee3066db522/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/inconshreveable/log15.v2 v2.0.0-20180818164646-67afb5ed74ec/go.mod h1:aPpfJ7XW+gOuirDoZ8gHhLh3kZ1B08FtV2bbmy7Jv3s=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
-gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

neoq.go

@@ -11,7 +11,6 @@ import (
 	"context"
 	"crypto/md5"
 	"encoding/json"
-	"errors"
 	"fmt"
 	"io"
 	"log"
@@ -27,6 +26,8 @@ import (
 	"github.com/guregu/null"
 	"github.com/jackc/pgx/v5"
 	"github.com/jackc/pgx/v5/pgxpool"
+	"github.com/pkg/errors"
+	"golang.org/x/exp/slog"
 )
 
 type contextKey int
@@ -187,13 +188,25 @@ type Neoq interface {
 	// Shutdown halts the worker
 	Shutdown() error
 
-	// WithOption configures the instance with optional configuration
+	// WithConfigOpt configures neoq with with optional configuration
 	WithConfigOpt(opt ConfigOption) Neoq
 
-	// Config retrieves an instance's configuration
+	// Config retrieves neoq's configuration
 	Config() *Config
 }
 
+// Logger interface is the interface that neoq's logger must implement
+//
+// This interface is a subset of [slog.Logger]. The slog interface was chosen under the assumption that its
+// likely to be Golang's standard library logging interface.
+//
+// TODO: Add WithLogger() and WithLoggerOpt() for user-supplied logger configuration
+type Logger interface {
+	Debug(msg string, args ...any)
+	Error(msg string, err error, args ...any)
+	Info(msg string, args ...any)
+}
+
 // HandlerFunc is a function that Handlers execute for every Job on a queue
 type HandlerFunc func(ctx context.Context) error
 
@@ -201,8 +214,8 @@ type HandlerFunc func(ctx context.Context) error
 type Handler struct {
 	deadline    time.Duration
 	handle      HandlerFunc
-	maxRetries  int
 	concurrency int
+	logger      Logger
 }
 
 // HandlerOption is function that sets optional configuration for Handlers
@@ -233,7 +246,11 @@ func WithConcurrency(c int) HandlerOption {
 
 // NewHandler creates a new queue handler
 func NewHandler(f HandlerFunc, opts ...HandlerOption) (h Handler) {
-	h = Handler{handle: f, concurrency: runtime.NumCPU() - 1}
+	h = Handler{
+		handle:      f,
+		concurrency: runtime.NumCPU() - 1,
+		logger:      slog.New(slog.NewTextHandler(os.Stdout)),
+	}
 
 	for _, opt := range opts {
 		opt(&h)
@@ -257,6 +274,7 @@ type pgWorker struct {
 	handlers        map[string]Handler  // a map of queue names to queue handlers
 	mu              *sync.Mutex         // mutext to protect mutating state on a pgWorker
 	futureJobs      map[int64]time.Time // map of future job IDs to their due time
+	logger          Logger
 }
 
 // New creates a new Neoq instance for listening to queues and enqueing new jobs
@@ -291,6 +309,7 @@ func New(connection string, opts ...ConfigOption) (n Neoq, err error) {
 		dbConnectString: connection,
 		handlers:        make(map[string]Handler),
 		futureJobs:      make(map[int64]time.Time),
+		logger:          slog.New(slog.NewTextHandler(os.Stdout)),
 	}
 
 	// Set all options
@@ -474,7 +493,6 @@ func (w pgWorker) Enqueue(job Job) (jobID int64, err error) {
 	ctx := context.Background()
 	conn, err := w.pool.Acquire(ctx)
 	if err != nil {
-		log.Println("failed to acquire database connection to listen for new queue items")
 		return
 	}
 	defer conn.Release()
@@ -708,7 +726,7 @@ func (w pgWorker) start(queue string) (err error) {
 					if err.Error() == "no rows in result set" {
 						err = nil
 					} else {
-						log.Println("error handling job", err)
+						w.logger.Error("error handling job", err, "job_id", jobID)
 					}
 
 					continue
@@ -733,13 +751,13 @@ func (w pgWorker) removeFutureJob(jobID int64) {
 func (w pgWorker) initFutureJobs(ctx context.Context, queue string) {
 	rows, err := w.pool.Query(context.Background(), FutureJobQuery, queue)
 	if err != nil {
-		log.Println("error fetching future jobs list:", err)
+		w.logger.Error("error fetching future jobs list", err)
 		return
 	}
 
 	var id int64
 	var runAfter time.Time
-	_, err = pgx.ForEachRow(rows, []any{&id, &runAfter}, func() error {
+	pgx.ForEachRow(rows, []any{&id, &runAfter}, func() error {
 		w.mu.Lock()
 		w.futureJobs[id] = runAfter
 		w.mu.Unlock()
@@ -759,7 +777,7 @@ func (w pgWorker) scheduleFutureJobs(ctx context.Context, queue string) {
 		// loop over list of future jobs, scheduling goroutines to wait for jobs that are due within the next 30 seconds
 		// TODO: Make 30 seconds configurable
 		for jobID, runAfter := range w.futureJobs {
-			at := runAfter.Sub(time.Now())
+			at := time.Until(runAfter)
 			if at <= time.Duration(30*time.Second) {
 				w.removeFutureJob(jobID)
 				go func(jid int64) {
@@ -785,7 +803,6 @@ func (w pgWorker) scheduleFutureJobs(ctx context.Context, queue string) {
 func (w pgWorker) announceJob(ctx context.Context, queue string, jobID int64) {
 	conn, err := w.pool.Acquire(ctx)
 	if err != nil {
-		log.Println("failed to acquire database connection to schedule future job")
 		return
 	}
 	defer conn.Release()
@@ -818,7 +835,7 @@ func (w pgWorker) pendingJobs(ctx context.Context, queue string) (jobsCh chan in
 	// TODO Consider refactoring to use pgxpool.AcquireFunc()
 	conn, err := w.pool.Acquire(ctx)
 	if err != nil {
-		log.Println("failed to acquire database connection to listen for new queue items:", err)
+		w.logger.Error("failed to acquire database connection to listen for pending queue items", err)
 		return
 	}
 
@@ -829,7 +846,7 @@ func (w pgWorker) pendingJobs(ctx context.Context, queue string) (jobsCh chan in
 			jobID, err := w.getPendingJobID(ctx, conn, queue)
 			if err != nil {
 				if err.Error() != "no rows in result set" {
-					log.Println(err)
+					w.logger.Error("failed to fetch pending job", err, "job_id", jobID)
 				} else {
 					// done fetching pending jobs
 					break
@@ -852,7 +869,6 @@ func (w pgWorker) handleJob(ctx context.Context, jobID int64, handler Handler) (
 	var tx pgx.Tx
 	conn, err := w.pool.Acquire(ctx)
 	if err != nil {
-		log.Println("failed to acquire database connection to process jobs")
 		return
 	}
 	defer conn.Release()
@@ -882,13 +898,13 @@ func (w pgWorker) handleJob(ctx context.Context, jobID int64, handler Handler) (
 	handlerErr := w.execHandler(ctx, handler)
 	err = w.updateJob(ctx, handlerErr)
 	if err != nil {
-		log.Println("error updating job status:", err)
+		err = errors.Wrap(err, "error updating job status")
 		return
 	}
 
 	err = tx.Commit(ctx)
 	if err != nil {
-		log.Printf("unable to commit transaction for job '%d': work may be duplicated if retried", job.ID)
+		w.logger.Error("unable to commit job transaction. retrying this job may dupliate work", err, "job_id", job.ID)
 	}
 
 	return
@@ -925,7 +941,7 @@ func (w pgWorker) listen(ctx context.Context, queue string) (c chan int64) {
 	// set this connection's idle in transaction timeout to infinite so it is not intermittently disconnected
 	_, err = w.listenConn.Exec(ctx, fmt.Sprintf("SET idle_in_transaction_session_timeout = '0'; LISTEN %s", queue))
 	if err != nil {
-		log.Println(err)
+		w.logger.Error("unable to create database connection for listener", err)
 		return
 	}
 
@@ -933,14 +949,14 @@ func (w pgWorker) listen(ctx context.Context, queue string) (c chan int64) {
 		for {
 			notification, waitErr := w.listenConn.WaitForNotification(ctx)
 			if waitErr != nil {
-				log.Println("failed to wait for notification:", waitErr)
+				w.logger.Error("failed to wait for notification", waitErr)
 				time.Sleep(1 * time.Second)
 				continue
 			}
 
 			var jobID int64
 			if jobID, err = strconv.ParseInt(notification.Payload, 0, 64); err != nil {
-				log.Println("unable to fetch job:", err)
+				w.logger.Error("unable to fetch job", err)
 				continue
 			}
 

neoq_test.go

@@ -4,9 +4,10 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"log"
 	"testing"
 	"time"
+
+	"golang.org/x/exp/slog"
 )
 
 func TestWorkerListenConn(t *testing.T) {
@@ -20,8 +21,9 @@ func TestWorkerListenConn(t *testing.T) {
 	numJobs := 1
 	var done = make(chan bool, numJobs)
 	handler := NewHandler(func(ctx context.Context) (err error) {
-		j, err := JobFromContext(ctx)
+		var j *Job
-		log.Println("got job id:", j.ID, "messsage:", j.Payload["message"])
+		j, err = JobFromContext(ctx)
+		slog.Info("got job", "id", j.ID, "messsage", j.Payload["message"])
 		done <- true
 		return
 	})
@@ -42,7 +44,7 @@ func TestWorkerListenConn(t *testing.T) {
 		jid, err := nq.Enqueue(Job{
 			Queue: queue,
 			Payload: map[string]interface{}{
-				"message": fmt.Sprintf("hello world: %d", 100),
+				"message": fmt.Sprintf("hello world: %d", i),
 			},
 		})
 		if err != nil || jid == -1 {