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57 lines
1.2 KiB
Go
57 lines
1.2 KiB
Go
// Copyright (c) Mainflux
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// SPDX-License-Identifier: Apache-2.0
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package cassandra
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import "github.com/gocql/gocql"
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const table = `CREATE TABLE IF NOT EXISTS messages (
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id uuid,
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channel text,
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subtopic text,
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publisher text,
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protocol text,
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name text,
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unit text,
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value double,
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string_value text,
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bool_value boolean,
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data_value blob,
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sum double,
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time double,
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update_time double,
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PRIMARY KEY (channel, time, id)
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) WITH CLUSTERING ORDER BY (time DESC)`
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// DBConfig contains Cassandra DB specific parameters.
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type DBConfig struct {
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Hosts []string
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Keyspace string
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Username string
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Password string
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Port int
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}
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// Connect establishes connection to the Cassandra cluster.
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func Connect(cfg DBConfig) (*gocql.Session, error) {
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cluster := gocql.NewCluster(cfg.Hosts...)
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cluster.Keyspace = cfg.Keyspace
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cluster.Consistency = gocql.Quorum
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cluster.Authenticator = gocql.PasswordAuthenticator{
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Username: cfg.Username,
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Password: cfg.Password,
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}
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cluster.Port = cfg.Port
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session, err := cluster.CreateSession()
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if err != nil {
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return nil, err
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}
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if err := session.Query(table).Exec(); err != nil {
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return nil, err
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}
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return session, nil
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}
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