feat: mail service
This commit is contained in:
Ilia Denisov
@@ -0,0 +1,402 @@
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// Package config loads the Mail Service process configuration from environment
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// variables.
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package config
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import (
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"crypto/tls"
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"fmt"
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"strings"
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"time"
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"galaxy/mail/internal/telemetry"
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)
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const (
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shutdownTimeoutEnvVar = "MAIL_SHUTDOWN_TIMEOUT"
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logLevelEnvVar = "MAIL_LOG_LEVEL"
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internalHTTPAddrEnvVar = "MAIL_INTERNAL_HTTP_ADDR"
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internalHTTPReadHeaderTimeoutEnvVar = "MAIL_INTERNAL_HTTP_READ_HEADER_TIMEOUT"
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internalHTTPReadTimeoutEnvVar = "MAIL_INTERNAL_HTTP_READ_TIMEOUT"
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internalHTTPIdleTimeoutEnvVar = "MAIL_INTERNAL_HTTP_IDLE_TIMEOUT"
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redisAddrEnvVar = "MAIL_REDIS_ADDR"
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redisUsernameEnvVar = "MAIL_REDIS_USERNAME"
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redisPasswordEnvVar = "MAIL_REDIS_PASSWORD"
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redisDBEnvVar = "MAIL_REDIS_DB"
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redisTLSEnabledEnvVar = "MAIL_REDIS_TLS_ENABLED"
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redisOperationTimeoutEnvVar = "MAIL_REDIS_OPERATION_TIMEOUT"
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redisCommandStreamEnvVar = "MAIL_REDIS_COMMAND_STREAM"
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redisAttemptScheduleEnvVar = "MAIL_REDIS_ATTEMPT_SCHEDULE_KEY"
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redisDeadLetterPrefixEnvVar = "MAIL_REDIS_DEAD_LETTER_PREFIX"
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smtpModeEnvVar = "MAIL_SMTP_MODE"
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smtpAddrEnvVar = "MAIL_SMTP_ADDR"
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smtpUsernameEnvVar = "MAIL_SMTP_USERNAME"
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smtpPasswordEnvVar = "MAIL_SMTP_PASSWORD"
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smtpFromEmailEnvVar = "MAIL_SMTP_FROM_EMAIL"
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smtpFromNameEnvVar = "MAIL_SMTP_FROM_NAME"
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smtpTimeoutEnvVar = "MAIL_SMTP_TIMEOUT"
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smtpInsecureSkipVerifyEnvVar = "MAIL_SMTP_INSECURE_SKIP_VERIFY"
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templateDirEnvVar = "MAIL_TEMPLATE_DIR"
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attemptWorkerConcurrencyEnvVar = "MAIL_ATTEMPT_WORKER_CONCURRENCY"
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streamBlockTimeoutEnvVar = "MAIL_STREAM_BLOCK_TIMEOUT"
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operatorRequestTimeoutEnvVar = "MAIL_OPERATOR_REQUEST_TIMEOUT"
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idempotencyTTLEnvVar = "MAIL_IDEMPOTENCY_TTL"
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deliveryTTLEnvVar = "MAIL_DELIVERY_TTL"
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attemptTTLEnvVar = "MAIL_ATTEMPT_TTL"
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otelServiceNameEnvVar = "OTEL_SERVICE_NAME"
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otelTracesExporterEnvVar = "OTEL_TRACES_EXPORTER"
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otelMetricsExporterEnvVar = "OTEL_METRICS_EXPORTER"
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otelExporterOTLPProtocolEnvVar = "OTEL_EXPORTER_OTLP_PROTOCOL"
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otelExporterOTLPTracesProtocolEnvVar = "OTEL_EXPORTER_OTLP_TRACES_PROTOCOL"
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otelExporterOTLPMetricsProtocolEnvVar = "OTEL_EXPORTER_OTLP_METRICS_PROTOCOL"
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otelStdoutTracesEnabledEnvVar = "MAIL_OTEL_STDOUT_TRACES_ENABLED"
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otelStdoutMetricsEnabledEnvVar = "MAIL_OTEL_STDOUT_METRICS_ENABLED"
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defaultShutdownTimeout = 5 * time.Second
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defaultLogLevel = "info"
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defaultInternalHTTPAddr = ":8080"
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defaultReadHeaderTimeout = 2 * time.Second
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defaultReadTimeout = 10 * time.Second
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defaultIdleTimeout = time.Minute
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defaultRedisDB = 0
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defaultRedisOperationTimeout = 250 * time.Millisecond
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defaultRedisCommandStream = "mail:delivery_commands"
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defaultRedisAttemptScheduleKey = "mail:attempt_schedule"
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defaultRedisDeadLetterPrefix = "mail:dead_letters:"
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defaultSMTPMode = SMTPModeStub
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defaultSMTPTimeout = 15 * time.Second
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defaultTemplateDir = "templates"
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defaultAttemptWorkerCount = 4
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defaultStreamBlockTimeout = 2 * time.Second
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defaultOperatorRequestTimeout = 5 * time.Second
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defaultIdempotencyTTL = 7 * 24 * time.Hour
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defaultDeliveryTTL = 30 * 24 * time.Hour
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defaultAttemptTTL = 90 * 24 * time.Hour
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defaultOTelServiceName = "galaxy-mail"
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)
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const (
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// SMTPModeStub configures the deterministic in-process stub provider.
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SMTPModeStub = "stub"
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// SMTPModeSMTP configures the real SMTP-backed provider adapter.
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SMTPModeSMTP = "smtp"
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)
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// Config stores the full Mail Service process configuration.
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type Config struct {
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// ShutdownTimeout bounds graceful shutdown of every long-lived component.
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ShutdownTimeout time.Duration
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// Logging configures the process-wide structured logger.
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Logging LoggingConfig
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// InternalHTTP configures the trusted internal HTTP listener.
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InternalHTTP InternalHTTPConfig
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// Redis configures the shared Redis client and Redis-owned keys used by the
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// runnable service skeleton.
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Redis RedisConfig
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// SMTP configures the runtime mail provider mode and provider-specific
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// connection details.
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SMTP SMTPConfig
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// Templates configures the filesystem-backed template catalog root.
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Templates TemplateConfig
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// AttemptWorkerConcurrency stores how many idle attempt workers the process
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// starts.
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AttemptWorkerConcurrency int
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// StreamBlockTimeout stores the maximum Redis Streams blocking read window
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// used by the future command consumer.
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StreamBlockTimeout time.Duration
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// OperatorRequestTimeout stores the future application-layer request budget
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// for trusted operator handlers.
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OperatorRequestTimeout time.Duration
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// IdempotencyTTL stores the configured retention for idempotency records.
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IdempotencyTTL time.Duration
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// DeliveryTTL stores the configured retention for delivery records.
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DeliveryTTL time.Duration
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// AttemptTTL stores the configured retention for attempt and dead-letter
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// records.
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AttemptTTL time.Duration
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// Telemetry configures the process-wide OpenTelemetry runtime.
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Telemetry TelemetryConfig
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}
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// LoggingConfig configures the process-wide structured logger.
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type LoggingConfig struct {
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// Level stores the process log level accepted by log/slog.
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Level string
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}
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// InternalHTTPConfig configures the trusted internal HTTP listener.
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type InternalHTTPConfig struct {
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// Addr stores the TCP listen address.
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Addr string
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// ReadHeaderTimeout bounds request-header reading.
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ReadHeaderTimeout time.Duration
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// ReadTimeout bounds reading one request.
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ReadTimeout time.Duration
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// IdleTimeout bounds how long keep-alive connections stay open.
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IdleTimeout time.Duration
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}
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// Validate reports whether cfg stores a usable internal HTTP listener
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// configuration.
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func (cfg InternalHTTPConfig) Validate() error {
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switch {
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case strings.TrimSpace(cfg.Addr) == "":
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return fmt.Errorf("internal HTTP addr must not be empty")
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case !isTCPAddr(cfg.Addr):
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return fmt.Errorf("internal HTTP addr %q must use host:port form", cfg.Addr)
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case cfg.ReadHeaderTimeout <= 0:
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return fmt.Errorf("internal HTTP read header timeout must be positive")
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case cfg.ReadTimeout <= 0:
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return fmt.Errorf("internal HTTP read timeout must be positive")
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case cfg.IdleTimeout <= 0:
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return fmt.Errorf("internal HTTP idle timeout must be positive")
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default:
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return nil
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}
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}
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// RedisConfig configures the shared Redis client used by the runnable process.
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type RedisConfig struct {
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// Addr stores the Redis network address.
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Addr string
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// Username stores the optional Redis ACL username.
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Username string
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// Password stores the optional Redis ACL password.
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Password string
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// DB stores the Redis logical database index.
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DB int
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// TLSEnabled reports whether TLS must be used for Redis connections.
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TLSEnabled bool
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// OperationTimeout bounds one Redis round trip including the startup PING.
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OperationTimeout time.Duration
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// CommandStream stores the configured Redis Streams key for async command
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// intake.
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CommandStream string
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// AttemptScheduleKey stores the configured sorted-set key of scheduled
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// attempts.
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AttemptScheduleKey string
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// DeadLetterPrefix stores the configured Redis key prefix of dead-letter
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// entries.
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DeadLetterPrefix string
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}
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// TLSConfig returns the conservative TLS configuration used by the Redis
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// client when TLSEnabled is true.
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func (cfg RedisConfig) TLSConfig() *tls.Config {
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if !cfg.TLSEnabled {
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return nil
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}
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return &tls.Config{MinVersion: tls.VersionTLS12}
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}
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// Validate reports whether cfg stores a usable Redis configuration.
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func (cfg RedisConfig) Validate() error {
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switch {
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case strings.TrimSpace(cfg.Addr) == "":
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return fmt.Errorf("redis addr must not be empty")
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case !isTCPAddr(cfg.Addr):
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return fmt.Errorf("redis addr %q must use host:port form", cfg.Addr)
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case cfg.DB < 0:
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return fmt.Errorf("redis db must not be negative")
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case cfg.OperationTimeout <= 0:
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return fmt.Errorf("redis operation timeout must be positive")
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case strings.TrimSpace(cfg.CommandStream) == "":
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return fmt.Errorf("redis command stream must not be empty")
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case strings.TrimSpace(cfg.AttemptScheduleKey) == "":
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return fmt.Errorf("redis attempt schedule key must not be empty")
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case strings.TrimSpace(cfg.DeadLetterPrefix) == "":
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return fmt.Errorf("redis dead-letter prefix must not be empty")
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default:
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return nil
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}
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}
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// SMTPConfig configures the selected provider adapter.
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type SMTPConfig struct {
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// Mode selects the runtime provider implementation. Supported values are
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// `stub` and `smtp`.
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Mode string
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// Addr stores the SMTP server address when Mode is `smtp`.
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Addr string
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// Username stores the optional SMTP authentication username.
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Username string
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// Password stores the optional SMTP authentication password.
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Password string
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// FromEmail stores the RFC 5322 single mailbox used as the envelope sender
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// when Mode is `smtp`.
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FromEmail string
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// FromName stores the optional display name attached to FromEmail.
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FromName string
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// Timeout stores the maximum SMTP dial-and-send window.
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Timeout time.Duration
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// InsecureSkipVerify disables SMTP certificate verification. This is meant
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// only for local development and black-box tests with self-signed capture
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// servers.
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InsecureSkipVerify bool
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}
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// Validate reports whether cfg stores a usable provider configuration.
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func (cfg SMTPConfig) Validate() error {
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switch cfg.Mode {
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case SMTPModeStub:
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return nil
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case SMTPModeSMTP:
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switch {
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case strings.TrimSpace(cfg.Addr) == "":
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return fmt.Errorf("smtp addr must not be empty")
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case !isTCPAddr(cfg.Addr):
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return fmt.Errorf("smtp addr %q must use host:port form", cfg.Addr)
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case cfg.Timeout <= 0:
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return fmt.Errorf("smtp timeout must be positive")
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case strings.TrimSpace(cfg.Username) == "" && strings.TrimSpace(cfg.Password) != "":
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return fmt.Errorf("smtp username and password must be configured together")
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case strings.TrimSpace(cfg.Username) != "" && strings.TrimSpace(cfg.Password) == "":
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return fmt.Errorf("smtp username and password must be configured together")
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default:
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return validateMailbox("smtp from email", cfg.FromEmail)
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}
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default:
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return fmt.Errorf("smtp mode %q is unsupported", cfg.Mode)
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}
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}
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// TemplateConfig configures the filesystem-backed template catalog.
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type TemplateConfig struct {
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// Dir stores the root directory of the template catalog.
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Dir string
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}
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// TelemetryConfig configures the Mail Service OpenTelemetry runtime.
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type TelemetryConfig struct {
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// ServiceName overrides the default OpenTelemetry service name.
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ServiceName string
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// TracesExporter selects the external traces exporter. Supported values are
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// `none` and `otlp`.
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TracesExporter string
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// MetricsExporter selects the external metrics exporter. Supported values
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// are `none` and `otlp`.
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MetricsExporter string
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// TracesProtocol selects the OTLP traces protocol when TracesExporter is
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// `otlp`.
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TracesProtocol string
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// MetricsProtocol selects the OTLP metrics protocol when MetricsExporter is
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// `otlp`.
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MetricsProtocol string
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// StdoutTracesEnabled enables the additional stdout trace exporter used for
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// local development and debugging.
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StdoutTracesEnabled bool
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// StdoutMetricsEnabled enables the additional stdout metric exporter used
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// for local development and debugging.
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StdoutMetricsEnabled bool
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}
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// Validate reports whether cfg stores a usable template catalog root.
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func (cfg TemplateConfig) Validate() error {
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if strings.TrimSpace(cfg.Dir) == "" {
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return fmt.Errorf("template dir must not be empty")
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}
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return nil
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}
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// DefaultConfig returns the default Mail Service process configuration.
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func DefaultConfig() Config {
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return Config{
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ShutdownTimeout: defaultShutdownTimeout,
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Logging: LoggingConfig{
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Level: defaultLogLevel,
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},
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InternalHTTP: InternalHTTPConfig{
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Addr: defaultInternalHTTPAddr,
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ReadHeaderTimeout: defaultReadHeaderTimeout,
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ReadTimeout: defaultReadTimeout,
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IdleTimeout: defaultIdleTimeout,
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},
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Redis: RedisConfig{
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DB: defaultRedisDB,
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OperationTimeout: defaultRedisOperationTimeout,
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CommandStream: defaultRedisCommandStream,
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AttemptScheduleKey: defaultRedisAttemptScheduleKey,
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DeadLetterPrefix: defaultRedisDeadLetterPrefix,
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},
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SMTP: SMTPConfig{
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Mode: defaultSMTPMode,
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Timeout: defaultSMTPTimeout,
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},
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Templates: TemplateConfig{
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Dir: defaultTemplateDir,
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},
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AttemptWorkerConcurrency: defaultAttemptWorkerCount,
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StreamBlockTimeout: defaultStreamBlockTimeout,
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OperatorRequestTimeout: defaultOperatorRequestTimeout,
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IdempotencyTTL: defaultIdempotencyTTL,
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DeliveryTTL: defaultDeliveryTTL,
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AttemptTTL: defaultAttemptTTL,
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Telemetry: TelemetryConfig{
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ServiceName: defaultOTelServiceName,
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TracesExporter: "none",
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MetricsExporter: "none",
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TracesProtocol: "",
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MetricsProtocol: "",
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StdoutTracesEnabled: false,
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StdoutMetricsEnabled: false,
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},
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}
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}
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// Validate reports whether cfg contains a supported OpenTelemetry
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// configuration.
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func (cfg TelemetryConfig) Validate() error {
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return telemetry.ProcessConfig{
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ServiceName: cfg.ServiceName,
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TracesExporter: cfg.TracesExporter,
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MetricsExporter: cfg.MetricsExporter,
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TracesProtocol: cfg.TracesProtocol,
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MetricsProtocol: cfg.MetricsProtocol,
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StdoutTracesEnabled: cfg.StdoutTracesEnabled,
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StdoutMetricsEnabled: cfg.StdoutMetricsEnabled,
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}.Validate()
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}
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