cloudsqlconnect

package
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 Go to latest Published: Aug 27, 2026 License: Apache-2.0 Imports: 9 Imported by: 0

Documentation

Overview

Package cloudsql provides shared utilities for Cloud SQL connection tools. This package is used by both cloudsqlpg and cloudsqlmysql tool packages to provide consistent connection recommendations, validation, and code generation.

Index

Constants

View Source 
const (
	MethodNameAuthProxy       = "Cloud SQL Auth Proxy"
	MethodNameConnector       = "Cloud SQL Connector Library"
	MethodNameDirectPrivateIP = "Direct Private IP Connection"
	MethodNameUnixSocket      = "Built-in Cloud SQL Connection (Unix Socket)"
)

Connection method display names for user-facing messages

Variables

View Source 
var AllDatabaseTypes = []DatabaseType{PostgreSQL, MySQL, SQLServer}

AllDatabaseTypes lists every Cloud SQL engine this package supports.

View Source 
var AvailableLanguages = []Language{LangPython, LangNodeJS, LangJava, LangGo}

AvailableLanguages lists all supported languages.

Functions

func DefaultDatabaseName 

func DefaultDatabaseName(dbType DatabaseType) string

DefaultDatabaseName returns the conventional default database name for an engine.

func ExtractNetworkName 

func ExtractNetworkName(path string) string

ExtractNetworkName pulls the trailing element off a fully-qualified network or subnetwork resource path. Idempotent for inputs that are already a name.

func FindVM 

func FindVM(ctx context.Context, service *compute.Service, project, vmName string) (*compute.Instance, string, error)

FindVM resolves a VM by name across all zones in a project. It uses a server-side name filter so the API short-circuits per-zone scans, and stops paging once a second match is seen (so we don't read pages we don't need just to error out).

func GenerateGKESidecarYAML 

func GenerateGKESidecarYAML(connectionName string, port int) string

GenerateGKESidecarYAML generates the sidecar container YAML for GKE deployments.

func GenerateKubernetesSecretYAML 

func GenerateKubernetesSecretYAML(dbName string) string

GenerateKubernetesSecretYAML generates a Kubernetes Secret manifest.

func GetCloudRunRecommendations 

func GetCloudRunRecommendations(sqlInfo *CloudSQLInstanceInfo, runInfo *CloudRunServiceInfo) (ConnectionRecommendation, []ConnectionRecommendation)

GetCloudRunRecommendations returns connection recommendations for Cloud Run.

func GetComputeService 

func GetComputeService(ctx context.Context, accessToken string) (*compute.Service, error)

GetComputeService returns a Compute Engine read-only client.

When accessToken is non-empty the returned client is scoped to that caller-supplied OAuth token, so IAM decisions on the Compute API are evaluated as the caller (matching how cloudsqladmin.Source.GetService treats its accessToken). When accessToken is empty the function returns the process-wide client backed by Application Default Credentials, built once on first call.

The ADC-backed initializer runs with context.Background() on purpose: a request-scoped ctx cached inside sync.Once would poison every subsequent invocation if the first caller cancelled. Callers still propagate their request ctx to individual API calls via Instances.Get(...).Context(ctx).Do().

func GetDatabasePort 

func GetDatabasePort(dbType DatabaseType) int

GetDatabasePort returns the default listening port for a Cloud SQL engine.

func GetGCERecommendations 

func GetGCERecommendations(sqlInfo *CloudSQLInstanceInfo, vmInfo *GCEInstanceInfo, sameVPC bool) (ConnectionRecommendation, []ConnectionRecommendation)

GetGCERecommendations returns connection recommendations for GCE VM. It analyzes the network configuration and returns the best connection method as primary, along with alternatives.

func GetGKERecommendations 

func GetGKERecommendations(sqlInfo *CloudSQLInstanceInfo, gkeInfo *GKEClusterInfo, sameVPC bool) (ConnectionRecommendation, []ConnectionRecommendation)

GetGKERecommendations returns connection recommendations for GKE cluster.

func GetLocalRecommendations 

func GetLocalRecommendations(sqlInfo *CloudSQLInstanceInfo) (ConnectionRecommendation, []ConnectionRecommendation)

GetLocalRecommendations returns connection recommendations for local development.

func IsSameVPC 

func IsSameVPC(sqlVPC, vmVPC string) bool

IsSameVPC reports whether the Cloud SQL VPC and the GCE VM VPC resolve to the same network name.

func IsValidLanguage 

func IsValidLanguage(lang string) bool

IsValidLanguage checks if the given language is supported.

func ParseConnectionName 

func ParseConnectionName(connName string) (project, region, instance string, err error)

ParseConnectionName splits a Cloud SQL instance connection name ("project:region:instance") into its three components, rejecting any input that doesn't have exactly three non-empty parts.

func ValidateDatabaseName 

func ValidateDatabaseName(name string) error

ValidateDatabaseName accepts the conservative subset of database identifier characters that's safe in DSNs and code-snippet templates across Postgres, MySQL and SQL Server. It deliberately rejects quotes, semicolons, and whitespace even when the engine itself would accept them.

func ValidateGCEResourceName 

func ValidateGCEResourceName(name, kind string) error

ValidateGCEResourceName checks a VM name or zone name against the standard GCE resource-name rule (lowercase, digits, hyphen; must start with a letter and not end with a hyphen, max 63 chars).

func ValidateInstanceConnectionName 

func ValidateInstanceConnectionName(connName string) (project, region, instance string, err error)

ValidateInstanceConnectionName splits and validates project, region, and instance ID per the GCP naming rules. Use this in place of plain ParseConnectionName when the parts will flow into generated code or shell.

func ValidateLanguage 

func ValidateLanguage(lang string) error

ValidateLanguage returns an error if the language is not supported.

Types

type CloudRunServiceInfo 

type CloudRunServiceInfo struct {
	Name              string
	Region            string
	Project           string
	ServiceAccount    string
	VPCConnector      string
	DirectVPCEgress   bool
	CloudSQLInstances []string
}

CloudRunServiceInfo contains information about a Cloud Run service.

type CloudSQLInstanceInfo 

type CloudSQLInstanceInfo struct {
	Name               string
	Project            string
	Region             string
	ConnectionName     string
	DatabaseVersion    string
	DatabaseType       DatabaseType
	PublicIPAddress    string
	PrivateIPAddress   string
	PublicIPEnabled    bool
	PrivateIPEnabled   bool
	VPCNetwork         string
	RequireSSL         bool
	AuthorizedNetworks []string
}

CloudSQLInstanceInfo contains information about a Cloud SQL instance.

func ExtractSQLInfo 

func ExtractSQLInfo(inst *sqladmin.DatabaseInstance) *CloudSQLInstanceInfo

ExtractSQLInfo lifts the fields the connect tools need out of a Cloud SQL Admin DatabaseInstance.

type CodeSnippet 

type CodeSnippet struct {
	Language     Language `json:"language"`
	Code         string   `json:"code"`
	Dependencies []string `json:"dependencies"`
	Notes        []string `json:"notes,omitempty"`
}

CodeSnippet represents generated code for connecting to Cloud SQL.

func GenerateCodeSnippet 

func GenerateCodeSnippet(lang Language, method ConnectionMethod, dbType DatabaseType, connectionName, dbName string, port int, privateIP string) *CodeSnippet

GenerateCodeSnippet generates a code snippet for the given configuration. SQL Server is routed to dedicated generators because the Cloud SQL Connector libraries fully support only Postgres and MySQL.

Every returned snippet carries a Dependencies list floor-pinned to the minimum tested version of each library (pip `>=`, npm `^`, Maven exact, Go module `@version`), plus an install-command note derived from that list, so the caller can install a known-working environment without hitting the "which version?" question.

type ComputeType 

type ComputeType string

ComputeType represents the type of compute environment. 

const (
	// ComputeGCE represents Google Compute Engine VMs
	ComputeGCE ComputeType = "gce"
	// ComputeGKE represents Google Kubernetes Engine clusters
	ComputeGKE ComputeType = "gke"
	// ComputeCloudRun represents Cloud Run services
	ComputeCloudRun ComputeType = "cloudrun"
	// ComputeLocal represents local development environments
	ComputeLocal ComputeType = "local"
)

type ConnectResult 

type ConnectResult struct {
	// Instance information
	InstanceConnectionName string       `json:"instanceConnectionName"`
	Project                string       `json:"project"`
	Region                 string       `json:"region"`
	DatabaseType           DatabaseType `json:"databaseType"`
	DatabaseVersion        string       `json:"databaseVersion"`

	// Compute information
	ComputeType     ComputeType `json:"computeType"`
	ComputeResource string      `json:"computeResource"`
	ComputeLocation string      `json:"computeLocation,omitempty"`

	// Network validation
	Validation ValidationResult `json:"validation"`

	// Recommendations
	RecommendedMethod  ConnectionRecommendation   `json:"recommendedMethod"`
	AlternativeMethods []ConnectionRecommendation `json:"alternativeMethods,omitempty"`

	// Configuration
	ConnectionStrings ConnectionStrings `json:"connectionStrings"`
	EnvironmentConfig EnvironmentConfig `json:"environmentConfig"`

	// Setup instructions
	SetupSteps []SetupStep `json:"setupSteps"`

	// Code snippet (only if language was specified)
	CodeSnippet        *CodeSnippet `json:"codeSnippet,omitempty"`
	AvailableLanguages []Language   `json:"availableLanguages"`

	// Required permissions and APIs
	RequiredIAMRoles []string `json:"requiredIamRoles"`
	RequiredAPIs     []string `json:"requiredApis"`
}

ConnectResult is the comprehensive result returned by connect tools.

type ConnectionMethod 

type ConnectionMethod string

ConnectionMethod represents a method to connect to Cloud SQL. 

const (
	// MethodAuthProxy uses Cloud SQL Auth Proxy for secure connections
	MethodAuthProxy ConnectionMethod = "auth_proxy"
	// MethodConnector uses Cloud SQL Connector libraries
	MethodConnector ConnectionMethod = "connector"
	// MethodDirectPrivateIP uses direct private IP connection
	MethodDirectPrivateIP ConnectionMethod = "direct_private_ip"
	// MethodUnixSocket uses Unix socket (Cloud Run built-in)
	MethodUnixSocket ConnectionMethod = "unix_socket"
)

type ConnectionRecommendation 

type ConnectionRecommendation struct {
	Method         ConnectionMethod `json:"method"`
	Name           string           `json:"name"`
	Description    string           `json:"description"`
	Priority       int              `json:"priority"`
	Security       string           `json:"security"`
	Complexity     string           `json:"complexity"`
	Performance    string           `json:"performance"`
	Requirements   []string         `json:"requirements"`
	Considerations []string         `json:"considerations,omitempty"`
}

ConnectionRecommendation represents a recommended connection method.

type ConnectionStrings 

type ConnectionStrings struct {
	Host       string `json:"host,omitempty"`
	Port       int    `json:"port,omitempty"`
	SocketPath string `json:"socketPath,omitempty"`
	DSN        string `json:"dsn,omitempty"`
	JDBC       string `json:"jdbc,omitempty"`
}

ConnectionStrings contains connection string templates. Credential placeholders use UPPERCASE tokens (USER, PASS) so they're obviously not real values.

func BuildConnectionStrings 

func BuildConnectionStrings(method ConnectionMethod, dbType DatabaseType, sqlInfo *CloudSQLInstanceInfo, dbName, connName string) ConnectionStrings

BuildConnectionStrings returns engine-aware DSN/JDBC templates for the given recommended connection method.

type DatabaseType 

type DatabaseType string

DatabaseType represents the type of database. 

const (
	// PostgreSQL database type
	PostgreSQL DatabaseType = "postgres"
	// MySQL database type
	MySQL DatabaseType = "mysql"
	// SQLServer (Cloud SQL for SQL Server) database type
	SQLServer DatabaseType = "sqlserver"
)

func ParseDatabaseType 

func ParseDatabaseType(version string) DatabaseType

ParseDatabaseType maps a Cloud SQL Admin API DatabaseVersion string (e.g. "POSTGRES_15", "MYSQL_8_0", "SQLSERVER_2022_STANDARD") to a DatabaseType. Unknown or empty versions fall back to PostgreSQL; callers that need to reject unknown values should use ParseDatabaseTypeStrict.

func ParseDatabaseTypeStrict 

func ParseDatabaseTypeStrict(version string) (DatabaseType, error)

ParseDatabaseTypeStrict is like ParseDatabaseType but returns an error instead of silently defaulting when the DatabaseVersion prefix is not one of the engines this package supports. Use it when auto-detecting the engine from a live sqladmin response so a new Cloud SQL engine (or a malformed value) surfaces a clear diagnostic instead of producing wrong output.

type EnvironmentConfig 

type EnvironmentConfig struct {
	// Common config
	EnvironmentVariables map[string]string `json:"environmentVariables"`

	// Auth Proxy config
	AuthProxyCommand string `json:"authProxyCommand,omitempty"`

	// GKE-specific config
	KubernetesServiceAccount string `json:"kubernetesServiceAccount,omitempty"`
	SidecarYAML              string `json:"sidecarYaml,omitempty"`
	SecretYAML               string `json:"secretYaml,omitempty"`

	// Cloud Run-specific config
	CloudRunFlags []string `json:"cloudRunFlags,omitempty"`
}

EnvironmentConfig represents environment-specific configuration.

func GenerateEnvironmentConfig 

func GenerateEnvironmentConfig(method ConnectionMethod, computeType ComputeType, connectionName string, port int, privateIP, dbName, projectID string) EnvironmentConfig

GenerateEnvironmentConfig generates environment configuration for the connection.

type GCEInstanceInfo 

type GCEInstanceInfo struct {
	Name           string
	Zone           string
	Project        string
	InternalIP     string
	ExternalIP     string
	VPCNetwork     string
	Subnetwork     string
	ServiceAccount string
	HasExternalIP  bool
}

GCEInstanceInfo contains information about a GCE VM instance.

func ExtractVMInfo 

func ExtractVMInfo(inst *compute.Instance, zone string) *GCEInstanceInfo

ExtractVMInfo lifts the fields the connect tools need out of a Compute Engine instance.

type GKEClusterInfo 

type GKEClusterInfo struct {
	Name             string
	Location         string
	Project          string
	VPCNetwork       string
	Subnetwork       string
	WorkloadIdentity bool
	PrivateCluster   bool
	VPCNative        bool
}

GKEClusterInfo contains information about a GKE cluster.

type Language 

type Language string

Language represents a programming language for code generation. 

const (
	// LangPython represents Python language
	LangPython Language = "python"
	// LangNodeJS represents Node.js/JavaScript
	LangNodeJS Language = "nodejs"
	// LangJava represents Java
	LangJava Language = "java"
	// LangGo represents Go
	LangGo Language = "go"
)

type SetupStep 

type SetupStep struct {
	Order       int    `json:"order"`
	Title       string `json:"title"`
	Description string `json:"description"`
	Command     string `json:"command,omitempty"`
}

SetupStep represents a step in the setup process.

func GenerateCloudRunSetupSteps 

func GenerateCloudRunSetupSteps(connectionName, serviceAccount, region string) []SetupStep

GenerateCloudRunSetupSteps generates setup steps for Cloud Run connection.

func GenerateGCESetupSteps 

func GenerateGCESetupSteps(method ConnectionMethod, connectionName string, port int, privateIP string, serviceAccount string) []SetupStep

GenerateGCESetupSteps generates setup steps for GCE VM connection.

func GenerateGKESetupSteps 

func GenerateGKESetupSteps(connectionName string, port int, projectID string, namespace string) []SetupStep

GenerateGKESetupSteps generates setup steps for GKE connection. The namespace parameter specifies the Kubernetes namespace for deployment.

func GenerateLocalSetupSteps 

func GenerateLocalSetupSteps(connectionName string, port int) []SetupStep

GenerateLocalSetupSteps generates setup steps for local development. This focuses on public IP connections via Auth Proxy, which is the recommended approach for local development. Private IP connections require VPN or Cloud Interconnect setup, which is outside the scope of this tool.

type ValidationCheck 

type ValidationCheck struct {
	Name    string `json:"name"`
	Status  string `json:"status"` // "pass", "fail", "warn", "info"
	Message string `json:"message"`
}

ValidationCheck represents a single validation check result.

type ValidationResult 

type ValidationResult struct {
	Valid           bool              `json:"valid"`
	Checks          []ValidationCheck `json:"checks"`
	Issues          []string          `json:"issues,omitempty"`
	Recommendations []string          `json:"recommendations,omitempty"`
}

ValidationResult represents the result of network validation.

func ValidateCloudRunConnection 

func ValidateCloudRunConnection(sqlInfo *CloudSQLInstanceInfo, runInfo *CloudRunServiceInfo) *ValidationResult

ValidateCloudRunConnection validates network connectivity between Cloud SQL and Cloud Run.

func ValidateGCEConnection 

func ValidateGCEConnection(sqlInfo *CloudSQLInstanceInfo, vmInfo *GCEInstanceInfo) *ValidationResult

ValidateGCEConnection validates network connectivity between Cloud SQL and GCE VM.

func ValidateGKEConnection 

func ValidateGKEConnection(sqlInfo *CloudSQLInstanceInfo, gkeInfo *GKEClusterInfo) *ValidationResult

ValidateGKEConnection validates network connectivity between Cloud SQL and GKE cluster.

func ValidateLocalConnection 

func ValidateLocalConnection(sqlInfo *CloudSQLInstanceInfo) *ValidationResult

ValidateLocalConnection validates requirements for local IDE connection.

Source Files

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