Class: Google::Cloud::Spanner::Project

Inherits:
Object
  • Object
show all
Defined in:
lib/google/cloud/spanner/project.rb

Overview

Project

Projects are top-level containers in Google Cloud Platform. They store information about billing and authorized users, and they contain Cloud Spanner data. Each project has a friendly name and a unique ID.

Google::Cloud::Spanner::Project is the main object for interacting with Cloud Spanner.

Instance and Database objects are created, accessed, and managed by Google::Cloud::Spanner::Project.

A Client obtained from a project can be used to read and/or modify data in a Cloud Spanner database.

See new and Google::Cloud#spanner.

Examples:

Obtaining an instance and a database from a project.

require "google/cloud"

spanner = Google::Cloud::Spanner.new
instance = spanner.instance "my-instance"
database = instance.database "my-database"

Obtaining a client for use with a database.

require "google/cloud/spanner"

spanner = Google::Cloud::Spanner.new

db = spanner.client "my-instance", "my-database"

db.transaction do |tx|
  results = tx.execute "SELECT * FROM users"

  results.rows.each do |row|
    puts "User #{row[:id]} is #{row[:name]}"
  end
end

Instance Method Summary collapse

Instance Method Details

#batch_client(instance_id, database_id) ⇒ Client

Creates a Cloud Spanner batch client. A batch client is used to read data across multiple machines or processes.

Examples:

require "google/cloud/spanner"

spanner = Google::Cloud::Spanner.new

batch_client = spanner.batch_client "my-instance", "my-database"

batch_snapshot = batch_client.batch_snapshot
serialized_snapshot = batch_snapshot.dump

partitions = batch_snapshot.partition_read "users", [:id, :name]

partition = partitions.first
serialized_partition = partition.dump

# In a separate process
new_batch_snapshot = batch_client.load_batch_snapshot \
  serialized_snapshot

new_partition = batch_client.load_partition \
  serialized_partition

results = new_batch_snapshot.execute_partition \
  new_partition

Parameters:

  • instance_id (String) —

    The unique identifier for the instance. Required.

  • database_id (String) —

    The unique identifier for the database. Required.

Returns:

  • (Client) —

    The newly created client.



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# File 'lib/google/cloud/spanner/project.rb', line 497

def batch_client instance_id, database_id
  BatchClient.new self, instance_id, database_id
end

#client(instance_id, database_id, pool: {}) ⇒ Client

Creates a Cloud Spanner client. A client is used to read and/or modify data in a Cloud Spanner database.

Examples:

require "google/cloud/spanner"

spanner = Google::Cloud::Spanner.new

db = spanner.client "my-instance", "my-database"

db.transaction do |tx|
  results = tx.execute "SELECT * FROM users"

  results.rows.each do |row|
    puts "User #{row[:id]} is #{row[:name]}"
  end
end

Parameters:

  • instance_id (String) —

    The unique identifier for the instance. Required.

  • database_id (String) —

    The unique identifier for the database. Required.

  • pool (Hash) —

    Settings to control how and when sessions are managed by the client. The following settings can be provided:

    • :min (Integer) Minimum number of sessions that the client will maintain at any point in time. The default is 10.
    • :max (Integer) Maximum number of sessions that the client will have at any point in time. The default is 100.
    • :keepalive (Numeric) The amount of time a session can be idle before an attempt is made to prevent the idle sessions from being closed by the Cloud Spanner service. The default is 1800 (30 minutes).
    • :write_ratio (Float) The ratio of sessions with pre-allocated transactions to those without. Pre-allocating transactions improves the performance of writes made by the client. The higher the value, the more transactions are pre-allocated. The value must be >= 0 and <= 1. The default is 0.3.
    • :fail (true/false) When true the client raises a SessionLimitError when the client has allocated the max number of sessions. When false the client blocks until a session becomes available. The default is true.
    • :threads (Integer) The number of threads in the thread pool. The default is twice the number of available CPUs.

Returns:

  • (Client) —

    The newly created client.



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# File 'lib/google/cloud/spanner/project.rb', line 456

def client instance_id, database_id, pool: {}
  Client.new self, instance_id, database_id,
             valid_session_pool_options(pool)
end

#create_database(instance_id, database_id, statements: []) ⇒ Database::Job

Creates a database and starts preparing it to begin serving.

See Database::Job.

Examples:

require "google/cloud/spanner"

spanner = Google::Cloud::Spanner.new

job = spanner.create_database "my-instance",
                              "my-new-database"

job.done? #=> false
job.reload! # API call
job.done? #=> true

if job.error?
  status = job.error
else
  database = job.database
end

Parameters:

  • instance_id (String) —

    The unique identifier for the instance. Required.

  • database_id (String) —

    The unique identifier for the database, which cannot be changed after the database is created. Values are of the form [a-z][a-z0-9_\-]*[a-z0-9] and must be between 2 and 30 characters in length. Required.

  • statements (Array<String>) —

    DDL statements to run inside the newly created database. Statements can create tables, indexes, etc. These statements execute atomically with the creation of the database: if there is an error in any statement, the database is not created. Optional.

Returns:

  • (Database::Job) —

    The job representing the long-running, asynchronous processing of a database create operation.



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# File 'lib/google/cloud/spanner/project.rb', line 402

def create_database instance_id, database_id, statements: []
  grpc = service.create_database instance_id, database_id,
                                 statements: statements
  Database::Job.from_grpc grpc, service
end

#create_instance(instance_id, name: nil, config: nil, nodes: nil, labels: nil) ⇒ Instance::Job

Creates a Cloud Spanner instance and starts preparing it to begin serving.

See Instance::Job.

Examples:

require "google/cloud/spanner"

spanner = Google::Cloud::Spanner.new

job = spanner.create_instance "my-new-instance",
                              name: "My New Instance",
                              config: "regional-us-central1",
                              nodes: 5,
                              labels: { production: :env }

job.done? #=> false
job.reload! # API call
job.done? #=> true

if job.error?
  status = job.error
else
  instance = job.instance
end

Parameters:

  • instance_id (String) —

    The unique identifier for the instance, which cannot be changed after the instance is created. Values are of the form [a-z][-a-z0-9]*[a-z0-9] and must be between 6 and 30 characters in length. Required.

  • name (String) —

    The descriptive name for this instance as it appears in UIs. Must be unique per project and between 4 and 30 characters in length. Required.

  • config (String, Instance::Config) —

    The name of the instance's configuration. Values can be the instance_config_id, the full path, or an Instance::Config object. Required.

  • nodes (Integer) —

    The number of nodes allocated to this instance. Required.

  • labels (Hash) —

    Cloud Labels are a flexible and lightweight mechanism for organizing cloud resources into groups that reflect a customer's organizational needs and deployment strategies. Cloud Labels can be used to filter collections of resources. They can be used to control how resource metrics are aggregated. And they can be used as arguments to policy management rules (e.g. route, firewall, load balancing, etc.).

    • Label keys must be between 1 and 63 characters long and must conform to the following regular expression: [a-z]([-a-z0-9]*[a-z0-9])?.
    • Label values must be between 0 and 63 characters long and must conform to the regular expression ([a-z]([-a-z0-9]*[a-z0-9])?)?.
    • No more than 64 labels can be associated with a given resource.

Returns:

  • (Instance::Job) —

    The job representing the long-running, asynchronous processing of an instance create operation.



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# File 'lib/google/cloud/spanner/project.rb', line 219

def create_instance instance_id, name: nil, config: nil, nodes: nil,
                    labels: nil
  config = config.path if config.respond_to? :path
  grpc = service.create_instance \
    instance_id, name: name, config: config, nodes: nodes,
                 labels: labels
  Instance::Job.from_grpc grpc, service
end

#database(instance_id, database_id) ⇒ Google::Cloud::Spanner::Database?

Retrieves a database by unique identifier.

Examples:

require "google/cloud/spanner"

spanner = Google::Cloud::Spanner.new
database = spanner.database "my-instance", "my-database"

Will return nil if instance does not exist.

require "google/cloud/spanner"

spanner = Google::Cloud::Spanner.new
database = spanner.database "my-instance", "my-database" # nil

Parameters:

  • instance_id (String) —

    The unique identifier for the instance.

  • database_id (String) —

    The unique identifier for the database.

Returns:



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# File 'lib/google/cloud/spanner/project.rb', line 356

def database instance_id, database_id
  ensure_service!
  grpc = service.get_database instance_id, database_id
  Database.from_grpc grpc, service
rescue Google::Cloud::NotFoundError
  nil
end

#databases(instance_id, token: nil, max: nil) ⇒ Array<Google::Cloud::Spanner::Database>

Retrieves the list of databases for the project.

Examples:

require "google/cloud/spanner"

spanner = Google::Cloud::Spanner.new

databases = spanner.databases "my-instance"
databases.each do |database|
  puts database.database_id
end

Retrieve all: (See Instance::Config::List::List#all)

require "google/cloud/spanner"

spanner = Google::Cloud::Spanner.new

databases = spanner.databases "my-instance"
databases.all do |database|
  puts database.database_id
end

Parameters:

  • instance_id (String) —

    The unique identifier for the instance.

  • token (String) —

    The token value returned by the last call to databases; indicates that this is a continuation of a call, and that the system should return the next page of data.

  • max (Integer) —

    Maximum number of databases to return.

Returns:



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# File 'lib/google/cloud/spanner/project.rb', line 329

def databases instance_id, token: nil, max: nil
  ensure_service!
  grpc = service.list_databases instance_id, token: token, max: max
  Database::List.from_grpc grpc, service, instance_id, max
end

#instance(instance_id) ⇒ Google::Cloud::Spanner::Instance?

Retrieves a Cloud Spanner instance by unique identifier.

Examples:

require "google/cloud/spanner"

spanner = Google::Cloud::Spanner.new
instance = spanner.instance "my-instance"

Will return nil if instance does not exist.

require "google/cloud/spanner"

spanner = Google::Cloud::Spanner.new
instance = spanner.instance "non-existing" # nil

Parameters:

  • instance_id (String) —

    The unique identifier for the instance.

Returns:



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# File 'lib/google/cloud/spanner/project.rb', line 154

def instance instance_id
  ensure_service!
  grpc = service.get_instance instance_id
  Instance.from_grpc grpc, service
rescue Google::Cloud::NotFoundError
  nil
end

#instance_config(instance_config_id) ⇒ Google::Cloud::Spanner::Instance::Config?

Retrieves an instance configuration by unique identifier.

Examples:

require "google/cloud/spanner"

spanner = Google::Cloud::Spanner.new
config = spanner.instance_config "regional-us-central1"

Will return nil if instance config does not exist.

require "google/cloud/spanner"

spanner = Google::Cloud::Spanner.new
config = spanner.instance_config "non-existing" # nil

Parameters:

  • instance_config_id (String) —

    The instance configuration identifier. Values can be the instance_config_id, or the full path.

Returns:



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# File 'lib/google/cloud/spanner/project.rb', line 289

def instance_config instance_config_id
  ensure_service!
  grpc = service.get_instance_config instance_config_id
  Instance::Config.from_grpc grpc
rescue Google::Cloud::NotFoundError
  nil
end

#instance_configs(token: nil, max: nil) ⇒ Array<Google::Cloud::Spanner::Instance::Config>

Retrieves the list of instance configurations for the project.

Examples:

require "google/cloud/spanner"

spanner = Google::Cloud::Spanner.new

instance_configs = spanner.instance_configs
instance_configs.each do |config|
  puts config.instance_config_id
end

Retrieve all: (See Instance::Config::List::List#all)

require "google/cloud/spanner"

spanner = Google::Cloud::Spanner.new

instance_configs = spanner.instance_configs
instance_configs.all do |config|
  puts config.instance_config_id
end

Parameters:

  • token (String) —

    The token value returned by the last call to instance_configs; indicates that this is a continuation of a call, and that the system should return the next page of data.

  • max (Integer) —

    Maximum number of instance configs to return.

Returns:



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# File 'lib/google/cloud/spanner/project.rb', line 260

def instance_configs token: nil, max: nil
  ensure_service!
  grpc = service.list_instance_configs token: token, max: max
  Instance::Config::List.from_grpc grpc, service, max
end

#instances(token: nil, max: nil) ⇒ Array<Google::Cloud::Spanner::Instance>

Retrieves the list of Cloud Spanner instances for the project.

Examples:

require "google/cloud/spanner"

spanner = Google::Cloud::Spanner.new

instances = spanner.instances
instances.each do |instance|
  puts instance.instance_id
end

Retrieve all: (See Instance::Config::List::List#all)

require "google/cloud/spanner"

spanner = Google::Cloud::Spanner.new

instances = spanner.instances
instances.all do |instance|
  puts instance.instance_id
end

Parameters:

  • token (String) —

    The token value returned by the last call to instances; indicates that this is a continuation of a call, and that the system should return the next page of data.

  • max (Integer) —

    Maximum number of instances to return.

Returns:



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# File 'lib/google/cloud/spanner/project.rb', line 128

def instances token: nil, max: nil
  ensure_service!
  grpc = service.list_instances token: token, max: max
  Instance::List.from_grpc grpc, service, max
end

#project_id ⇒ Object Also known as: project

The identifier for the Cloud Spanner project.

Examples:

require "google/cloud"

spanner = Google::Cloud::Spanner.new(
  project_id: "my-project",
  credentials: "/path/to/keyfile.json"
)

spanner.project_id #=> "my-project"


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# File 'lib/google/cloud/spanner/project.rb', line 92

def project_id
  service.project
end