lib

package
v0.0.0-...-ca2726e Latest Latest
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 Go to latest Published: Nov 4, 2017 License: BSD-3-Clause Imports: 18 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	ConnectorName = "Google Cloud Print Connector"

	// A website with user-friendly information.
	ConnectorHomeURL = "https://github.com/avlis/cloud-print-connector"

	GCPAPIVersion = "2.0"
)

Variables

View Source 
var (
	ConfigFilenameFlag = cli.StringFlag{
		Name:  "config-filename",
		Usage: "Connector config filename",
		Value: defaultConfigFilename,
	}

	// To be populated by something like:
	// go install -ldflags "-X github.com/avlis/cloud-print-connector/lib.BuildDate=`date +%Y.%m.%d`"
	BuildDate = "20171104"

	ShortName = platformName + " Connector " + BuildDate + "-" + runtime.GOOS

	FullName = ConnectorName + " for " + platformName + " version " + BuildDate + "-" + runtime.GOOS
)
View Source 
var DefaultConfig = Config{
	LocalPrintingEnable:           true,
	CloudPrintingEnable:           false,
	DisablePrinterDeletionOnCloud: false,

	XMPPServer:                "talk.google.com",
	XMPPPort:                  443,
	XMPPPingTimeout:           "5s",
	XMPPPingInterval:          "2m",
	GCPBaseURL:                "https://www.google.com/cloudprint/",
	GCPOAuthClientID:          "539833558011-35iq8btpgas80nrs3o7mv99hm95d4dv6.apps.googleusercontent.com",
	GCPOAuthClientSecret:      "V9BfPOvdiYuw12hDx5Y5nR0a",
	GCPOAuthAuthURL:           "https://accounts.google.com/o/oauth2/auth",
	GCPOAuthTokenURL:          "https://accounts.google.com/o/oauth2/token",
	GCPMaxConcurrentDownloads: 5,

	NativeJobQueueSize:        3,
	NativePrinterPollInterval: "1m",
	PrefixJobIDToJobTitle:     PointerToBool(false),
	DisplayNamePrefix:         "",
	PrinterBlacklist:          []string{},
	PrinterWhitelist:          []string{},
	LogLevel:                  "INFO",

	LocalPortLow:  26000,
	LocalPortHigh: 26999,

	LogFileName:         "/tmp/cloud-print-connector",
	LogFileMaxMegabytes: 1,
	LogMaxFiles:         3,
	LogToJournal:        PointerToBool(false),

	MonitorSocketFilename: "/tmp/cloud-print-connector-monitor.sock",

	CUPSMaxConnections: 50,
	CUPSConnectTimeout: "5s",
	CUPSPrinterAttributes: []string{
		"cups-version",
		"device-uri",
		"document-format-supported",
		"print-color-mode-default",
		"print-color-mode-supported",
		"printer-name",
		"printer-info",
		"printer-location",
		"printer-make-and-model",
		"printer-state",
		"printer-state-reasons",
		"printer-uuid",
		"marker-names",
		"marker-types",
		"marker-levels",
		"copies-default",
		"copies-supported",
		"number-up-default",
		"number-up-supported",
		"orientation-requested-default",
		"orientation-requested-supported",
		"pdf-versions-supported",
	},
	CUPSJobFullUsername:              PointerToBool(false),
	CUPSIgnoreRawPrinters:            PointerToBool(true),
	CUPSIgnoreClassPrinters:          PointerToBool(true),
	CUPSCopyPrinterInfoToDisplayName: PointerToBool(true),
}

DefaultConfig represents reasonable default values for Config fields. Omitted Config fields are omitted on purpose; they are unique per connector instance.

Functions

func DeepHash 

func DeepHash(data interface{}, h hash.Hash)

DeepHash writes an object's values to h. Struct member names are ignored, values are written to h. Map keys and values are written to h. Slice inde and values are written to h. Pointers are followed once. Recursive pointer references cause panic.

func FilterRawPrinters 

func FilterRawPrinters(printers []Printer) ([]Printer, []Printer)

FilterRawPrinters splits a slice of printers into non-raw and raw.

func PointerToBool 

func PointerToBool(b bool) *bool

PointerToBool converts a boolean value (constant) to a pointer-to-bool.

func PrinterIsClass 

func PrinterIsClass(printer Printer) bool

func PrinterIsRaw 

func PrinterIsRaw(printer Printer) bool

Types

type Backoff 

type Backoff struct {
	// contains filtered or unexported fields
}

Backoff provides a mechanism for determining a good amount of time before retrying an operation.

func (*Backoff) Pause 

func (b *Backoff) Pause() (time.Duration, bool)

Pause returns the amount of time to wait before retrying an operation and true if it is ok to try again or false if the operation should be abandoned.

type ConcurrentPrinterMap 

type ConcurrentPrinterMap struct {
	// contains filtered or unexported fields
}

ConcurrentPrinterMap is a map-like data structure that is also thread-safe. Printers are keyed by Printer.Name and Printer.GCPID.

func NewConcurrentPrinterMap 

func NewConcurrentPrinterMap(printers []Printer) *ConcurrentPrinterMap

NewConcurrentPrinterMap initializes an empty ConcurrentPrinterMap.

func (*ConcurrentPrinterMap) GetAll 

func (cpm *ConcurrentPrinterMap) GetAll() []Printer

GetAll returns a slice of all printers.

func (*ConcurrentPrinterMap) GetByGCPID 

func (cpm *ConcurrentPrinterMap) GetByGCPID(gcpID string) (Printer, bool)

Get gets a printer, using the GCP ID as key.

The second return value is true if the entry exists.

func (*ConcurrentPrinterMap) GetByNativeName 

func (cpm *ConcurrentPrinterMap) GetByNativeName(name string) (Printer, bool)

Get gets a printer, using the native name as key.

The second return value is true if the entry exists.

func (*ConcurrentPrinterMap) Refresh 

func (cpm *ConcurrentPrinterMap) Refresh(newPrinters []Printer)

Refresh replaces the internal (non-concurrent) map with newPrinters.

type Config 

type Config struct {
	// Enable local discovery and printing.
	LocalPrintingEnable bool `json:"local_printing_enable"`

	// Enable cloud discovery and printing.
	CloudPrintingEnable bool `json:"cloud_printing_enable"`

	// Disable printer deletion on cloud.
	DisablePrinterDeletionOnCloud bool `json:"disable_printer_deletion_on_cloud"`

	// Associated with root account. XMPP credential.
	XMPPJID string `json:"xmpp_jid,omitempty"`

	// Associated with robot account. Used for acquiring OAuth access tokens.
	RobotRefreshToken string `json:"robot_refresh_token,omitempty"`

	// Associated with user account. Used for sharing GCP printers; may be omitted.
	UserRefreshToken string `json:"user_refresh_token,omitempty"`

	// Scope (user, group, domain) to share printers with.
	ShareScope string `json:"share_scope,omitempty"`

	// User-chosen name of this proxy. Should be unique per Google user account.
	ProxyName string `json:"proxy_name,omitempty"`

	// XMPP server FQDN.
	XMPPServer string `json:"xmpp_server,omitempty"`

	// XMPP server port number.
	XMPPPort uint16 `json:"xmpp_port,omitempty"`

	// XMPP ping timeout (give up waiting after this time).
	// TODO: Rename with "gcp_" removed.
	XMPPPingTimeout string `json:"gcp_xmpp_ping_timeout,omitempty"`

	// XMPP ping interval (time between ping attempts).
	// TODO: Rename with "gcp_" removed.
	// TODO: Rename with "_default" removed.
	XMPPPingInterval string `json:"gcp_xmpp_ping_interval_default,omitempty"`

	// GCP API URL prefix.
	GCPBaseURL string `json:"gcp_base_url,omitempty"`

	// OAuth2 client ID (not unique per client).
	GCPOAuthClientID string `json:"gcp_oauth_client_id,omitempty"`

	// OAuth2 client secret (not unique per client).
	GCPOAuthClientSecret string `json:"gcp_oauth_client_secret,omitempty"`

	// OAuth2 auth URL.
	GCPOAuthAuthURL string `json:"gcp_oauth_auth_url,omitempty"`

	// OAuth2 token URL.
	GCPOAuthTokenURL string `json:"gcp_oauth_token_url,omitempty"`

	// Maximum quantity of jobs (data) to download concurrently.
	GCPMaxConcurrentDownloads uint `json:"gcp_max_concurrent_downloads,omitempty"`

	// CUPS job queue size, must be greater than zero.
	// TODO: rename without cups_ prefix
	NativeJobQueueSize uint `json:"cups_job_queue_size,omitempty"`

	// Interval (eg 10s, 1m) between CUPS printer state polls.
	// TODO: rename without cups_ prefix
	NativePrinterPollInterval string `json:"cups_printer_poll_interval,omitempty"`

	// Use the full username (joe@example.com) in job.
	// TODO: rename without cups_ prefix
	CUPSJobFullUsername *bool `json:"cups_job_full_username,omitempty"`

	// Add the job ID to the beginning of the job title. Useful for debugging.
	PrefixJobIDToJobTitle *bool `json:"prefix_job_id_to_job_title,omitempty"`

	// Prefix for all GCP printers hosted by this connector.
	DisplayNamePrefix string `json:"display_name_prefix,omitempty"`

	// Ignore printers with native names.
	PrinterBlacklist []string `json:"printer_blacklist,omitempty"`

	// Allow printers with native names.
	PrinterWhitelist []string `json:"printer_whitelist,omitempty"`

	// Least severity to log.
	LogLevel string `json:"log_level"`

	// Local only: HTTP API port range, low.
	LocalPortLow uint16 `json:"local_port_low,omitempty"`

	// Local only: HTTP API port range, high.
	LocalPortHigh uint16 `json:"local_port_high,omitempty"`

	// CUPS only: Where to place log file.
	LogFileName string `json:"log_file_name"`

	// CUPS only: Maximum log file size.
	LogFileMaxMegabytes uint `json:"log_file_max_megabytes,omitempty"`

	// CUPS only: Maximum log file quantity.
	LogMaxFiles uint `json:"log_max_files,omitempty"`

	// CUPS only: Log to the systemd journal instead of to files?
	LogToJournal *bool `json:"log_to_journal,omitempty"`

	// CUPS only: Filename of unix socket for connector-check to talk to connector.
	MonitorSocketFilename string `json:"monitor_socket_filename,omitempty"`

	// CUPS only: Maximum quantity of open CUPS connections.
	CUPSMaxConnections uint `json:"cups_max_connections,omitempty"`

	// CUPS only: timeout for opening a new connection.
	CUPSConnectTimeout string `json:"cups_connect_timeout,omitempty"`

	// CUPS only: printer attributes to copy to GCP.
	CUPSPrinterAttributes []string `json:"cups_printer_attributes,omitempty"`

	// CUPS only: non-standard PPD options to add as GCP vendor capabilities.
	CUPSVendorPPDOptions []string `json:"cups_vendor_ppd_options,omitempty"`

	// CUPS only: ignore printers with make/model 'Local Raw Printer'.
	CUPSIgnoreRawPrinters *bool `json:"cups_ignore_raw_printers,omitempty"`

	// CUPS only: ignore printers with make/model 'Local Printer Class'.
	CUPSIgnoreClassPrinters *bool `json:"cups_ignore_class_printers,omitempty"`

	// CUPS only: copy the CUPS printer's printer-info attribute to the GCP printer's defaultDisplayName.
	// TODO: rename with cups_ prefix
	CUPSCopyPrinterInfoToDisplayName *bool `json:"copy_printer_info_to_display_name,omitempty"`
}

func GetConfig 

func GetConfig(context *cli.Context) (*Config, string, error)

GetConfig reads a Config object from the config file indicated by the config filename flag. If no such file exists, then DefaultConfig is returned.

func (*Config) Backfill 

func (c *Config) Backfill(configMap map[string]interface{}) *Config

Backfill returns a copy of this config with all missing keys set to default values.

func (*Config) Sparse 

func (c *Config) Sparse(context *cli.Context) *Config

Sparse returns a copy of this config with obvious values removed.

func (*Config) ToFile 

func (c *Config) ToFile(context *cli.Context) (string, error)

ToFile writes this Config object to the config file indicated by ConfigFile.

type DuplexVendorMap 

type DuplexVendorMap map[cdd.DuplexType]string

DuplexVendorMap maps a DuplexType to a CUPS key:value option string for a given printer.

type Job 

type Job struct {
	NativePrinterName string
	Filename          string
	Title             string
	User              string
	JobID             string
	Ticket            *cdd.CloudJobTicket
	UpdateJob         func(string, *cdd.PrintJobStateDiff) error
}

type Printer 

type Printer struct {
	GCPID              string                         //                                    GCP: printerid (GCP key)
	Name               string                         // CUPS: cups_dest_t.name (CUPS key); GCP: name field
	DefaultDisplayName string                         // CUPS: printer-info;                GCP: default_display_name field
	UUID               string                         // CUPS: printer-uuid;                GCP: uuid field
	Manufacturer       string                         // CUPS: PPD;                         GCP: manufacturer field
	Model              string                         // CUPS: PPD;                         GCP: model field
	GCPVersion         string                         //                                    GCP: gcpVersion field
	SetupURL           string                         //                                    GCP: setup_url field
	SupportURL         string                         //                                    GCP: support_url field
	UpdateURL          string                         //                                    GCP: update_url field
	ConnectorVersion   string                         //                                    GCP: firmware field
	State              *cdd.PrinterStateSection       // CUPS: various;                     GCP: semantic_state field
	Description        *cdd.PrinterDescriptionSection // CUPS: translated PPD;              GCP: capabilities field
	CapsHash           string                         // CUPS: hash of PPD;                 GCP: capsHash field
	Tags               map[string]string              // CUPS: all printer attributes;      GCP: repeated tag field
	DuplexMap          DuplexVendorMap                // CUPS: PPD;
	NativeJobSemaphore *Semaphore
	QuotaEnabled       bool
	DailyQuota         int
}

CUPS: cups_dest_t; GCP: /register and /update interfaces

func FilterBlacklistPrinters 

func FilterBlacklistPrinters(printers []Printer, list map[string]interface{}) []Printer

func FilterWhitelistPrinters 

func FilterWhitelistPrinters(printers []Printer, list map[string]interface{}) []Printer

func (*Printer) GetHostname 

func (p *Printer) GetHostname() (string, bool)

GetHostname gets the network hostname, parsed from Printer.Tags["device-uri"].

type PrinterDiff 

type PrinterDiff struct {
	Operation PrinterDiffOperation
	Printer   Printer

	DefaultDisplayNameChanged bool
	ManufacturerChanged       bool
	ModelChanged              bool
	GCPVersionChanged         bool
	SetupURLChanged           bool
	SupportURLChanged         bool
	UpdateURLChanged          bool
	ConnectorVersionChanged   bool
	StateChanged              bool
	DescriptionChanged        bool
	CapsHashChanged           bool
	TagsChanged               bool
	DuplexMapChanged          bool
	QuotaEnabledChanged       bool
	DailyQuotaChanged         bool
}

Describes changes to be pushed to a GCP printer.

func DiffPrinters 

func DiffPrinters(nativePrinters, gcpPrinters []Printer) []PrinterDiff

DiffPrinters returns the diff between old (GCP) and new (native) printers. Returns nil if zero printers or if all diffs are NoChangeToPrinter operation.

type PrinterDiffOperation 

type PrinterDiffOperation int8
const (
	RegisterPrinter PrinterDiffOperation = iota
	UpdatePrinter
	DeletePrinter
	NoChangeToPrinter
)

type PrinterState 

type PrinterState uint8

type Semaphore 

type Semaphore struct {
	// contains filtered or unexported fields
}

func NewSemaphore 

func NewSemaphore(size uint) *Semaphore

func (*Semaphore) Acquire 

func (s *Semaphore) Acquire()

Acquire increments the semaphore, blocking if necessary.

func (*Semaphore) Count 

func (s *Semaphore) Count() uint

Count returns the current value of the semaphore.

func (*Semaphore) Release 

func (s *Semaphore) Release()

Release decrements the semaphore. If this operation causes the semaphore value to be negative, then panics.

func (*Semaphore) Size 

func (s *Semaphore) Size() uint

Size returns the maximum semaphore value.

func (*Semaphore) TryAcquire 

func (s *Semaphore) TryAcquire() bool

TryAcquire increments the semaphore without blocking. Returns false if the semaphore was not acquired.

Source Files

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