Add initial database framework
parent
33be12038a
commit
5692d6fd6d
@ -0,0 +1,122 @@
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package beehive
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import (
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"database/sql"
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"log"
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)
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const initSchema = `
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CREATE TABLE worker (
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id serial PRIMARY KEY
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);
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CREATE TABLE deployment (
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id serial PRIMARY KEY,
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created timestamptz,
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modified timestamptz,
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worker_id integer REFERENCES worker,
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festoon text
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);
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CREATE TABLE task (
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id serial PRIMARY KEY,
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type integer,
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created timestamptz,
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started timestamptz,
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completed timestamptz,
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deployment_id integer REFERENCES deployment
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);
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CREATE INDEX ON task (started);
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CREATE INDEX ON task (completed);
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CREATE INDEX ON task (deployment_id);
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CREATE FUNCTION task_notify() RETURNS trigger AS $$
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BEGIN
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NOTIFY task;
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END;
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$$ LANGUAGE plpgsql;
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CREATE TRIGGER task_notify_trigger
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AFTER INSERT ON task
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EXECUTE FUNCTION task_notify();
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`
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var DB *Database
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type Database struct {
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db *sql.DB
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}
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func NewDatabase(driverName string, dataSource string) (*Database, error) {
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db, err := sql.Open(driverName, dataSource)
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if err != nil {
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return nil, err
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}
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// Test connection.
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_, err = db.Exec("SET search_path TO queenbee")
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if err != nil {
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log.Fatal(err)
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}
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// Initialize database.
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var result int
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err = db.QueryRow("SELECT COUNT(*) FROM information_schema.tables WHERE table_schema = 'queenbee' AND table_name = 'deployment'").Scan(&result)
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if err != nil {
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log.Fatal(err)
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} else if result == 0 {
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_, err = db.Exec(initSchema)
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if err != nil {
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log.Fatalf("failed to initialize database: %s", err)
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}
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log.Println("Initialized database schema")
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}
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d := &Database{
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db: db,
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}
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return d, nil
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}
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func (d *Database) StartTransaction() error {
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_, err := d.db.Exec("BEGIN")
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return err
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}
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func (d *Database) CancelTransaction() error {
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_, err := d.db.Exec("ROLLBACK")
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return err
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}
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func (d *Database) CommitTransaction() error {
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_, err := d.db.Exec("COMMIT")
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return err
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}
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func (d *Database) PendingTasks() ([]*Task, error) {
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var tasks []*Task
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rows, err := d.db.Query("SELECT id, created, started, completed, deployment_id from task where started = 0 ORDER BY id ASC")
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if err != nil {
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return nil, err
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}
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for rows.Next() {
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task := &Task{}
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err = rows.Scan(task.ID, task.Created, task.Started, task.Completed, task.DeploymentID)
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if err != nil {
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return nil, err
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}
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tasks = append(tasks, task)
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}
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return tasks, nil
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}
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func (d *Database) AddTask(t *Task) error {
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_, err := d.db.Exec("INSERT INTO task (created, started, completed, deployment_id) VALUES (null, ?, ?, ?, ?)", t.Created, t.Started, t.Completed, t.DeploymentID)
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return err
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}
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func (d *Database) UpdateTask(t *Task) error {
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_, err := d.db.Exec("UPDATE task SET started=?, completed=?, deployment_id=? WHERE id=?", t.Started, t.Completed, t.DeploymentID, t.ID)
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return err
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}
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