From 48ad87961d8eda76bd6a531de0815ad38a9024fb Mon Sep 17 00:00:00 2001 From: Anton Kovalenko Date: Sat, 23 Apr 2022 22:22:21 +0300 Subject: [PATCH] Initial release --- go.mod | 18 ++++ go.sum | 177 +++++++++++++++++++++++++++++++++++++++ pgxevent.go | 235 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 430 insertions(+) create mode 100644 go.mod create mode 100644 go.sum create mode 100644 pgxevent.go diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..fb49119 --- /dev/null +++ b/go.mod @@ -0,0 +1,18 @@ +module git.int.sw4me.com/akovalenko/pgxevent + +go 1.18 + +require github.com/jackc/pgx/v4 v4.16.0 + +require ( + github.com/jackc/chunkreader/v2 v2.0.1 // indirect + github.com/jackc/pgconn v1.12.0 // indirect + github.com/jackc/pgio v1.0.0 // indirect + github.com/jackc/pgpassfile v1.0.0 // indirect + github.com/jackc/pgproto3/v2 v2.3.0 // indirect + github.com/jackc/pgservicefile v0.0.0-20200714003250-2b9c44734f2b // indirect + github.com/jackc/pgtype v1.11.0 // indirect + github.com/jackc/puddle v1.2.1 // indirect + golang.org/x/crypto v0.0.0-20210711020723-a769d52b0f97 // indirect + golang.org/x/text v0.3.7 // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..2b93cf7 --- /dev/null +++ b/go.sum @@ -0,0 +1,177 @@ +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/Masterminds/semver/v3 v3.1.1/go.mod h1:VPu/7SZ7ePZ3QOrcuXROw5FAcLl4a0cBrbBpGY/8hQs= +github.com/cockroachdb/apd v1.1.0 h1:3LFP3629v+1aKXU5Q37mxmRxX/pIu1nijXydLShEq5I= +github.com/cockroachdb/apd v1.1.0/go.mod h1:8Sl8LxpKi29FqWXR16WEFZRNSz3SoPzUzeMeY4+DwBQ= +github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4= +github.com/coreos/go-systemd v0.0.0-20190719114852-fd7a80b32e1f/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4= +github.com/creack/pty v1.1.7/go.mod 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b/pgxevent.go new file mode 100644 index 0000000..6a77b59 --- /dev/null +++ b/pgxevent.go @@ -0,0 +1,235 @@ +package pgxevent + +import ( + "context" + "strings" + "text/template" + + pgx "github.com/jackc/pgx/v4" + pgxpool "github.com/jackc/pgx/v4/pgxpool" +) + +// Listener binds a condition on a data table to a handler: when the +// condition is (or becomes) true for a row, the row ID is passed to +// Handler.Handle +type Listener struct { + Table string // Table name, may be double-quoted + PrimaryKeyColumn string // Primary key column + ConditionTemplate *template.Template // WHERE condition with {{.}} substituted for table alias + Handler EventHandler // Interface +} + +type EventConfig struct { + DatabaseURL string + ServiceName string + ServiceVersion string + Listeners map[string]Listener +} + +type request struct { + Channel string + Payload string +} + +type completion struct { + Channel string + Payload string + Error error +} + +func Listen(ctx context.Context, cfg *EventConfig) error { + ctx, cancel := context.WithCancel(ctx) + _ = cancel + pool, err := pgxpool.Connect(ctx, cfg.DatabaseURL) + if err != nil { + return err + } + defer pool.Close() + conn, err := pool.Acquire(ctx) + defer conn.Release() + + err = conn.BeginFunc(ctx, func(tx pgx.Tx) error { + _, err = tx.Exec(ctx, `CREATE TABLE IF NOT EXISTS pgxevent +(service TEXT PRIMARY KEY, version TEXT)`) + if err != nil { + return err + } + row := tx.QueryRow(ctx, `SELECT version FROM pgxevent +WHERE service = $1`, cfg.ServiceName) + needsUpdate := false + ver := "" + err := row.Scan(&ver) + if err == pgx.ErrNoRows { + _, err := tx.Exec(ctx, `INSERT INTO +pgxevent(service, version) VALUES ($1,$2)`, + cfg.ServiceName, cfg.ServiceVersion) + if err != nil { + return err + } + needsUpdate = true + } else if err == nil { + if err != nil { + return err + } + needsUpdate = (ver != cfg.ServiceVersion) + _, err := tx.Exec(ctx, `UPDATE pgxevent +SET version=$1 WHERE service=$2`, + cfg.ServiceVersion, cfg.ServiceName) + if err != nil { + return err + } + } else { + return err + } + if needsUpdate { + for key, value := range cfg.Listeners { + triggerName := "pgxevent:" + cfg.ServiceName + ":" + key + condBuffer := strings.Builder{} + err = value.ConditionTemplate.Execute(&condBuffer, "new") + if err != nil { + return err + } + conditionNew := condBuffer.String() + condBuffer = strings.Builder{} + err = value.ConditionTemplate.Execute(&condBuffer, "old") + if err != nil { + return err + } + conditionOld := condBuffer.String() + + condition := "(" + conditionNew + ") and (old is null or not (" + conditionOld + "))" + + _, err := tx.Exec(ctx, + `CREATE OR REPLACE FUNCTION "`+triggerName+`"() + RETURNS TRIGGER AS $$ + DECLARE + BEGIN + IF (`+condition+`) THEN + PERFORM pg_notify('`+triggerName+`', CAST(NEW.`+value.PrimaryKeyColumn+` AS TEXT)); + END IF; + RETURN NEW; + END $$ LANGUAGE PLPGSQL + `) + if err != nil { + return err + } + + _, err = tx.Exec(ctx, `DROP TRIGGER IF EXISTS "`+ + triggerName+`" ON `+value.Table) + if err != nil { + return err + } + + _, err = tx.Exec(ctx, `CREATE TRIGGER "`+triggerName+`"`+` + AFTER INSERT OR UPDATE ON `+value.Table+` + FOR EACH ROW + EXECUTE PROCEDURE "`+triggerName+`"() + `) + if err != nil { + return err + } + + } + } + return nil + }) + if err != nil { + return err + } + + running := make(map[string]map[string]bool) + for key, _ := range cfg.Listeners { + triggerName := "pgxevent:" + cfg.ServiceName + ":" + key + _, err := conn.Exec(ctx, `LISTEN "`+triggerName+`"`) + if err != nil { + return err + } + running[key] = make(map[string]bool) + } + var cascadingError error + startChannel := make(chan request) + completionChannel := make(chan completion) + counter := 2 + teardown := false + + go func() { + prefix := "pgxevent:" + cfg.ServiceName + ":" + for { + notification, err := conn.Conn().WaitForNotification(ctx) + if err != nil { + completionChannel <- completion{"", "", err} + return + } + startChannel <- request{notification.Channel[len(prefix):], + notification.Payload} + } + }() + + go func() { + for channel, notification := range cfg.Listeners { + condBuffer := strings.Builder{} + err := notification.ConditionTemplate.Execute(&condBuffer, "Tab") + if err != nil { + completionChannel <- completion{"", "", err} + return + } + rows, err := pool.Query(ctx, `SELECT CAST ( Tab.`+ + notification.PrimaryKeyColumn+` AS text) as id FROM "`+ + notification.Table+`" AS Tab WHERE`+ + `(`+condBuffer.String()+`)`) + if err != nil { + completionChannel <- completion{"", "", err} + return + } + for rows.Next() { + var payload string + err = rows.Scan(&payload) + if err != nil { + completionChannel <- completion{"", "", err} + return + } + startChannel <- request{channel, payload} + } + + } + completionChannel <- completion{} + return + }() + + for { + select { + case start := <-startChannel: + if !teardown { + if !running[start.Channel][start.Payload] { + counter++ + running[start.Channel][start.Payload] = true + go func(req request) { + err := cfg.Listeners[start.Channel]. + Handler.Handle(ctx, pool, req.Payload) + completionChannel <- completion{req.Channel, req.Payload, err} + }(start) + + } + } + case complete := <-completionChannel: + if complete.Error != nil { + if !teardown { + teardown = true + cancel() + cascadingError = complete.Error + } + } + if complete.Channel != "" { + delete(running[complete.Channel], complete.Payload) + } + counter-- + if counter == 0 { + return cascadingError + } + } + } +} + +type EventHandler interface { + Handle(ctx context.Context, pool *pgxpool.Pool, id string) error +}