Golang canolog.Error函數代碼示例

func (conn *CassConnection) CreateAccount(
	username,
	email,
	password string) (datalayer.Account, error) {

	salt := conn.dl.cfg.OptPasswordSecretSalt()
	hashCost := conn.dl.cfg.OptPasswordHashCost()

	password_hash, _ := bcrypt.GenerateFromPassword(
		[]byte(password+salt), int(hashCost))

	err := validateUsername(username)
	if err != nil {
		return nil, err
	}

	err = validateEmail(email)
	if err != nil {
		return nil, err
	}

	err = validatePassword(password)
	if err != nil {
		return nil, err
	}

	activation_code, err := random.Base64String(24)
	if err != nil {
		return nil, err
	}

	now := time.Now()

	// TODO: transactionize
	if err := conn.session.Query(`
            INSERT INTO accounts (
                username, 
                email, 
                password_hash, 
                activated, 
                activation_code,
                password_reset_code,
                password_reset_code_expiry)
            VALUES (?, ?, ?, ?, ?, ?, ?)
    `, username, email, password_hash, false, activation_code, "", now).Exec(); err != nil {
		canolog.Error("Error creating account:", err)
		return nil, err
	}

	if err := conn.session.Query(`
            INSERT INTO account_emails (email, username)
            VALUES (?, ?)
    `, email, username).Exec(); err != nil {
		canolog.Error("Error setting account email:", err)
		return nil, err
	}

	return &CassAccount{conn, username, email, password_hash, false, activation_code, "", now}, nil
}

func (conn *CassConnection) LookupAccount(
	usernameOrEmail string) (datalayer.Account, error) {
	var account CassAccount
	var username string

	canolog.Info("Looking up account: ", usernameOrEmail)

	if strings.Contains(usernameOrEmail, "@") {
		canolog.Info("It is an email address")
		// email address provided.  Lookup username based on email
		err := conn.session.Query(`
                SELECT email, username FROM account_emails
                WHERE email = ?
                LIMIT 1
        `, usernameOrEmail).Consistency(gocql.One).Scan(
			&account.email, &username)

		if err != nil {
			canolog.Error("Error looking up account", err)
			return nil, err
		}
	} else {
		canolog.Info("It is not an email address")
		username = usernameOrEmail
	}

	canolog.Info("fetching info for: ", username)
	// Lookup account info based on username
	err := conn.session.Query(`
            SELECT 
                username, 
                email, 
                password_hash, 
                activated, 
                activation_code, 
                password_reset_code, 
                password_reset_code_expiry 
            FROM accounts 
            WHERE username = ?
            LIMIT 1
    `, username).Consistency(gocql.One).Scan(
		&account.username,
		&account.email,
		&account.password_hash,
		&account.activated,
		&account.activation_code,
		&account.password_reset_code,
		&account.password_reset_code_expiry)

	if err != nil {
		canolog.Error("Error looking up account", err)
		return nil, err
	}

	canolog.Info("Success")
	account.conn = conn
	return &account, nil
}

func (account *CassAccount) SetEmail(newEmail string) error {
	// validate new email address
	err := validateEmail(newEmail)
	if err != nil {
		return err
	}

	// generate new activation code
	newActivationCode, err := random.Base64String(24)
	if err != nil {
		return err
	}

	// TODO: transactionize
	// update accounts table
	err = account.conn.session.Query(`
            UPDATE accounts
            SET email = ?,
                activated = false,
                activation_code = ?
            WHERE username = ?
    `, newEmail, newActivationCode, account.Username()).Exec()
	if err != nil {
		canolog.Error("Error changing email address to", newEmail, ":", err)
		return err
	}

	// Update account_emails table
	// Remove old email address
	err = account.conn.session.Query(`
            DELETE FROM account_emails
            WHERE email = ?
    `, account.Email()).Exec()
	if err != nil {
		canolog.Error("Error removing old email while changing email address to", newEmail, ":", err)
		return err
	}

	// Add new email address
	err = account.conn.session.Query(`
            INSERT INTO account_emails (email, username)
            VALUES (?, ?)
    `, newEmail, account.Username()).Exec()
	if err != nil {
		canolog.Error("Error adding new email while changing email address to", newEmail, ":", err)
		return err
	}

	// update local copy
	account.activated = false
	account.activation_code = newActivationCode
	account.email = newEmail

	return nil
}

func (conn *CassConnection) DeleteAccount(username string) error {
	// TODO: We should archive the account, not actually delete it.
	// TODO: If we are really deleting it, then we need to also cleanup
	// all the other data (permissions, orphanded devices, etc).
	account, err := conn.LookupAccount(username)
	if err != nil {
		canolog.Error("Error looking up account for deletion: ", err)
		return err
	}

	email := account.Email()

	// TODO: Transactionize.  This might be done by adding a txn state field to
	// the table.

	err = conn.session.Query(`
            DELETE FROM device_group
            WHERE username = ?
    `, username).Exec()
	if err != nil {
		canolog.Error("Error deleting account's device groups", err)
		return err
	}

	err = conn.session.Query(`
            DELETE FROM device_permissions
            WHERE username = ?
    `, username).Exec()
	if err != nil {
		canolog.Error("Error deleting account's permission", err)
		return err
	}

	err = conn.session.Query(`
            DELETE FROM account_emails
            WHERE email = ?
    `, email).Exec()
	if err != nil {
		canolog.Error("Error deleting account email", err)
		return err
	}

	err = conn.session.Query(`
            DELETE FROM accounts
            WHERE username = ?
    `, username).Exec()
	if err != nil {
		canolog.Error("Error deleting account", err)
		return err
	}

	return nil
}

func (outbox *PigeonOutbox) send(hostname string, request *PigeonRequest, respChan chan<- Response) error {
	resp := &PigeonResponse{}

	// Dial the server
	// TODO: Inefficient to dial each time?
	canolog.Info("RPC Dialing")
	rpcClient, err := rpc.DialHTTP("tcp", hostname+":1888")
	if err != nil {
		return fmt.Errorf("Pigeon: (dialing) %s", err.Error())
	}
	defer rpcClient.Close()

	// Make the call
	canolog.Info("RPC Calling")
	err = rpcClient.Call("PigeonServer.RPCHandleRequest", request, resp)
	if err != nil {
		canolog.Error("Pigeon: (calling) ", err.Error())
		// Send error response to channel
		respChan <- resp
		return fmt.Errorf("Pigeon: (calling) %s", err.Error())
	}

	// Send response to channel
	respChan <- resp

	return nil
}

func (conn *CassConnection) LookupDevice(
	deviceId gocql.UUID) (datalayer.Device, error) {
	var device CassDevice

	device.deviceId = deviceId
	device.conn = conn
	var last_seen time.Time
	var ws_connected bool

	err := conn.session.Query(`
        SELECT friendly_name, location_note, secret_key, sddl, last_seen, ws_connected
        FROM devices
        WHERE device_id = ?
        LIMIT 1`, deviceId).Consistency(gocql.One).Scan(
		&device.name,
		&device.locationNote,
		&device.secretKey,
		&device.docString,
		&last_seen,
		&ws_connected)
	if err != nil {
		canolog.Error(err)
		return nil, err
	}

	// This scan returns Jan 1, 1970 UTC if last_seen is NULL.
	if last_seen.Before(time.Unix(1, 0)) {
		device.last_seen = nil
	} else {
		device.last_seen = &last_seen
	}

	device.wsConnected = ws_connected

	if device.docString != "" {
		device.doc, err = sddl.Sys.ParseDocumentString(device.docString)
		if err != nil {
			canolog.Error("Error parsing class string for device: ", device.docString, err)
			return nil, err
		}
	} else {
		device.doc = sddl.Sys.NewEmptyDocument()
	}

	return &device, nil
}

func (device *CassDevice) ExtendSDDL(jsn map[string]interface{}) error {
	// TODO: Race condition?
	doc := device.SDDLDocument()

	err := doc.Extend(jsn)
	if err != nil {
		canolog.Error("Error extending class ", jsn, err)
		return err
	}

	// save modified SDDL class to DB
	err = device.SetSDDLDocument(doc)
	if err != nil {
		canolog.Error("Error saving SDDL: ", err)
		return err
	}
	return nil
}

func (sys *SDDLSys) ParseDocumentString(doc string) (Document, error) {
	var jsn map[string]interface{}
	err := json.Unmarshal([]byte(doc), &jsn)
	if err != nil {
		canolog.Error("Error JSON decoding SDDL docoument: %s %s", doc, err)
		return nil, err
	}
	return sys.ParseDocument(jsn)
}

func (conn *CassConnection) LookupDeviceByStringID(
	id string) (datalayer.Device, error) {

	deviceId, err := gocql.ParseUUID(id)
	if err != nil {
		canolog.Error(err)
		return nil, err
	}
	return conn.LookupDevice(deviceId)
}

func (dl *CassDatalayer) EraseDb(keyspace string) error {
	cluster := gocql.NewCluster("127.0.0.1")

	session, err := cluster.CreateSession()
	if err != nil {
		canolog.Error("Error creating DB session: ", err)
		return err
	}

	err = session.Query(`DROP KEYSPACE ` + keyspace + ``).Exec()
	return err
}

func (dl *CassDatalayer) PrepDb(keyspace string) error {
	cluster := gocql.NewCluster("127.0.0.1")

	session, err := cluster.CreateSession()
	if err != nil {
		canolog.Error("Error creating DB session: ", err)
		return err
	}

	// Create keyspace.
	err = session.Query(`
            CREATE KEYSPACE ` + keyspace + `
            WITH REPLICATION = {'class' : 'SimpleStrategy', 'replication_factor' : 1}
    `).Exec()
	if err != nil {
		// Ignore errors (just log them).
		canolog.Warn("(IGNORED) ", err)
	}

	// Create a new session connecting to that keyspace.
	cluster = gocql.NewCluster("127.0.0.1")
	cluster.Keyspace = keyspace
	cluster.Consistency = gocql.Quorum
	session, err = cluster.CreateSession()
	if err != nil {
		canolog.Error("Error creating DB session: ", err)
		return err
	}

	// Perform all creation queries.
	for _, query := range creationQueries {
		if err := session.Query(query).Exec(); err != nil {
			// Ignore errors (just print them).
			// This allows PrepDB to be used to add new tables.  Eventually, we
			// should come up with a proper migration strategy.
			canolog.Warn("(IGNORED) ", query, ": ", err)
		}
	}
	return nil
}

func (conn *CassConnection) DeleteDevice(deviceId gocql.UUID) error {
	// TODO: Should we archive the device, not actually delete it?
	device, err := conn.LookupDevice(deviceId)
	if err != nil {
		canolog.Error("Error deleting device", err)
		return err
	}

	err = conn.session.Query(`
            DELETE FROM devices
            WHERE device_id = ?
    `, device.ID()).Exec()
	if err != nil {
		canolog.Error("Error deleting from devices table", err)
		return err
	}

	// TODO: How to cleanup device_permissions?

	// TODO: transactionize
	// TODO: Cleanup cloud variable data
	return nil
}

func (dl *CassDatalayer) MigrateDB(keyspace, startVersion, endVersion string) error {
	var err error
	cluster := gocql.NewCluster("127.0.0.1")
	cluster.Keyspace = keyspace

	session, err := cluster.CreateSession()
	if err != nil {
		canolog.Error("Error creating DB session: ", err)
		return err
	}

	curVersion := startVersion
	for curVersion != endVersion {
		canolog.Info("Migrating from %s to next version", curVersion)
		curVersion, err = dl.migrateNext(session, startVersion)
		if err != nil {
			canolog.Error("Failed migrating from %s:", curVersion, err)
			return err
		}
	}
	canolog.Info("Migration complete!  DB is now version: %s", curVersion)
	return nil
}

// Insert a cloud variable data sample.
func (device *CassDevice) InsertSample(varDef sddl.VarDef, t time.Time, value interface{}) error {
	// Convert to UTC before inserting
	t = t.UTC()
	canolog.Info("Inserting sample", varDef.Name(), t)

	// check last update time
	lastUpdateTime, err := device.varLastUpdateTime(varDef.Name())
	if err != nil {
		canolog.Error("Error inserting sample:", err.Error())
		return err
	}
	canolog.Info("Last update time was", lastUpdateTime)

	if t.Before(lastUpdateTime) {
		canolog.Error("Insertion time before last update time: ", t, lastUpdateTime)
		return fmt.Errorf("Insertion time %s before last update time %s", t, lastUpdateTime)
	}

	// update last update time
	err = device.varSetLastUpdateTime(varDef.Name(), t)
	if err != nil {
		return err
	}

	// For each LOD, insert or discard sample based on our
	// stratification algorithm.
	for lod := LOD_0; lod < LOD_END; lod++ {
		err = device.insertOrDiscardSampleLOD(varDef, lastUpdateTime, lod, t, value)
		if err != nil {
			// TODO: Transactionize/rollback?
			return err
		}
	}

	// TODO: Do we need to update in-memory device object?
	return nil
}

func (pigeonsys *CassPigeonSystem) GetListeners(key string) ([]string, error) {
	var workers []string
	rows, err := pigeonsys.conn.session.Query(`
            SELECT * FROM listeners
            WHERE key = ?
    `, key).Consistency(gocql.One).Iter().SliceMap()
	if err != nil {
		canolog.Error(err)
	}
	if len(rows) != 1 {
		return nil, fmt.Errorf("Expected 1 DB row for listener ", key)
	}
	workers = rows[0]["workers"].([]string)
	return workers, nil
}