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Diffstat (limited to 'apt-pkg/acquire.h')
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diff --git a/apt-pkg/acquire.h b/apt-pkg/acquire.h new file mode 100644 index 0000000..a2c4fbc --- /dev/null +++ b/apt-pkg/acquire.h @@ -0,0 +1,867 @@ +// -*- mode: cpp; mode: fold -*- +// Description /*{{{*/ +/* ###################################################################### + + Acquire - File Acquiration + + This module contains the Acquire system. It is responsible for bringing + files into the local pathname space. It deals with URIs for files and + URI handlers responsible for downloading or finding the URIs. + + Each file to download is represented by an Acquire::Item class subclassed + into a specialization. The Item class can add itself to several URI + acquire queues each prioritized by the download scheduler. When the + system is run the proper URI handlers are spawned and the acquire + queues are fed into the handlers by the schedular until the queues are + empty. This allows for an Item to be downloaded from an alternate source + if the first try turns out to fail. It also allows concurrent downloading + of multiple items from multiple sources as well as dynamic balancing + of load between the sources. + + Schedualing of downloads is done on a first ask first get basis. This + preserves the order of the download as much as possible. And means the + fastest source will tend to process the largest number of files. + + Internal methods and queues for performing gzip decompression, + md5sum hashing and file copying are provided to allow items to apply + a number of transformations to the data files they are working with. + + ##################################################################### */ + /*}}}*/ + +/** \defgroup acquire Acquire system {{{ + * + * \brief The Acquire system is responsible for retrieving files from + * local or remote URIs and postprocessing them (for instance, + * verifying their authenticity). The core class in this system is + * pkgAcquire, which is responsible for managing the download queues + * during the download. There is at least one download queue for + * each supported protocol; protocols such as http may provide one + * queue per host. + * + * Each file to download is represented by a subclass of + * pkgAcquire::Item. The files add themselves to the download + * queue(s) by providing their URI information to + * pkgAcquire::Item::QueueURI, which calls pkgAcquire::Enqueue. + * + * Once the system is set up, the Run method will spawn subprocesses + * to handle the enqueued URIs; the scheduler will then take items + * from the queues and feed them into the handlers until the queues + * are empty. + * + * \todo Acquire supports inserting an object into several queues at + * once, but it is not clear what its behavior in this case is, and + * no subclass of pkgAcquire::Item seems to actually use this + * capability. + */ /*}}}*/ + +/** \addtogroup acquire + * + * @{ + * + * \file acquire.h + */ + +#ifndef PKGLIB_ACQUIRE_H +#define PKGLIB_ACQUIRE_H + +#include <apt-pkg/hashes.h> +#include <apt-pkg/macros.h> +#include <apt-pkg/weakptr.h> + +#include <string> +#include <vector> + +#include <stddef.h> +#include <sys/select.h> +#include <sys/time.h> + + + +class pkgAcquireStatus; +class metaIndex; + +/** \brief The core download scheduler. {{{ + * + * This class represents an ongoing download. It manages the lists + * of active and pending downloads and handles setting up and tearing + * down download-related structures. + * + * \todo Why all the protected data items and methods? + */ +class APT_PUBLIC pkgAcquire +{ + private: + /** \brief FD of the Lock file we acquire in Setup (if any) */ + int LockFD; + /** \brief dpointer placeholder (for later in case we need it) */ + void * const d; + + public: + + class Item; + class Queue; + class Worker; + struct MethodConfig; + struct ItemDesc; + friend class Item; + friend class pkgAcqMetaBase; + friend class Queue; + + typedef std::vector<Item *>::iterator ItemIterator; + typedef std::vector<Item *>::const_iterator ItemCIterator; + + protected: + + /** \brief A list of items to download. + * + * This is built monotonically as items are created and only + * emptied when the download shuts down. + */ + std::vector<Item *> Items; + + /** \brief The head of the list of active queues. + * + * \todo why a hand-managed list of queues instead of std::list or + * std::set? + */ + Queue *Queues; + + /** \brief The head of the list of active workers. + * + * \todo why a hand-managed list of workers instead of std::list + * or std::set? + */ + Worker *Workers; + + /** \brief The head of the list of acquire method configurations. + * + * Each protocol (http, ftp, gzip, etc) via which files can be + * fetched can have a representation in this list. The + * configuration data is filled in by parsing the 100 Capabilities + * string output by a method on startup (see + * pkgAcqMethod::pkgAcqMethod and pkgAcquire::GetConfig). + * + * \todo why a hand-managed config dictionary instead of std::map? + */ + MethodConfig *Configs; + + /** \brief The progress indicator for this download. */ + pkgAcquireStatus *Log; + + /** \brief The number of files which are to be fetched. */ + unsigned long ToFetch; + + // Configurable parameters for the scheduler + + /** \brief Represents the queuing strategy for remote URIs. */ + enum QueueStrategy { + /** \brief Generate one queue for each protocol/host combination; downloads from + * multiple hosts can proceed in parallel. + */ + QueueHost, + /** \brief Generate a single queue for each protocol; serialize + * downloads from multiple hosts. + */ + QueueAccess} QueueMode; + + /** \brief If \b true, debugging information will be dumped to std::clog. */ + bool const Debug; + /** \brief If \b true, a download is currently in progress. */ + bool Running; + + /** \brief Add the given item to the list of items. */ + void Add(Item *Item); + + /** \brief Remove the given item from the list of items. */ + void Remove(Item *Item); + + /** \brief Add the given worker to the list of workers. */ + void Add(Worker *Work); + + /** \brief Remove the given worker from the list of workers. */ + void Remove(Worker *Work); + + /** \brief Insert the given fetch request into the appropriate queue. + * + * \param Item The URI to download and the item to download it + * for. Copied by value into the queue; no reference to Item is + * retained. + */ + void Enqueue(ItemDesc &Item); + + /** \brief Remove all fetch requests for this item from all queues. */ + void Dequeue(Item *Item); + + /** \brief Determine the fetch method and queue of a URI. + * + * \param URI The URI to fetch. + * + * \param[out] Config A location in which to place the method via + * which the URI is to be fetched. + * + * \return the string-name of the queue in which a fetch request + * for the given URI should be placed. + */ + std::string QueueName(std::string URI,MethodConfig const *&Config); + + /** \brief Build up the set of file descriptors upon which select() should + * block. + * + * The default implementation inserts the file descriptors + * corresponding to active downloads. + * + * \param[out] Fd The largest file descriptor in the generated sets. + * + * \param[out] RSet The set of file descriptors that should be + * watched for input. + * + * \param[out] WSet The set of file descriptors that should be + * watched for output. + */ + virtual void SetFds(int &Fd,fd_set *RSet,fd_set *WSet); + + /** Handle input from and output to file descriptors which select() + * has determined are ready. The default implementation + * dispatches to all active downloads. + * + * \param RSet The set of file descriptors that are ready for + * input. + * + * \param WSet The set of file descriptors that are ready for + * output. + * + * \return false if there is an error condition on one of the fds + */ + virtual bool RunFds(fd_set *RSet,fd_set *WSet); + + /** \brief Check for idle queues with ready-to-fetch items. + * + * Called by pkgAcquire::Queue::Done each time an item is dequeued + * but remains on some queues; i.e., another queue should start + * fetching it. + */ + void Bump(); + + public: + + /** \brief Retrieve information about a fetch method by name. + * + * \param Access The name of the method to look up. + * + * \return the method whose name is Access, or \b NULL if no such method exists. + */ + MethodConfig *GetConfig(std::string Access); + + /** \brief Provides information on how a download terminated. */ + enum RunResult { + /** \brief All files were fetched successfully. */ + Continue, + + /** \brief Some files failed to download. */ + Failed, + + /** \brief The download was cancelled by the user (i.e., #Log's + * pkgAcquireStatus::Pulse() method returned \b false). + */ + Cancelled}; + + /** \brief Download all the items that have been Add()ed to this + * download process. + * + * This method will block until the download completes, invoking + * methods on #Log to report on the progress of the download. + * + * \param PulseInterval The method pkgAcquireStatus::Pulse will be + * invoked on #Log at intervals of PulseInterval milliseconds. + * + * \return the result of the download. + */ + RunResult Run(int PulseInterval=500000); + + /** \brief Remove all items from this download process, terminate + * all download workers, and empty all queues. + */ + void Shutdown(); + + /** \brief Get the first Worker object. + * + * \return the first active worker in this download process. + */ + inline Worker *WorkersBegin() {return Workers;}; + + /** \brief Advance to the next Worker object. + * + * \return the worker immediately following I, or \b NULL if none + * exists. + */ + Worker *WorkerStep(Worker *I) APT_PURE; + + /** \brief Get the head of the list of items. */ + inline ItemIterator ItemsBegin() {return Items.begin();}; + inline ItemCIterator ItemsBegin() const {return Items.begin();}; + + /** \brief Get the end iterator of the list of items. */ + inline ItemIterator ItemsEnd() {return Items.end();}; + inline ItemCIterator ItemsEnd() const {return Items.end();}; + + // Iterate over queued Item URIs + class UriIterator; + /** \brief Get the head of the list of enqueued item URIs. + * + * This iterator will step over every element of every active + * queue. + */ + UriIterator UriBegin(); + /** \brief Get the end iterator of the list of enqueued item URIs. */ + UriIterator UriEnd(); + + /** Deletes each entry in the given directory that is not being + * downloaded by this object. For instance, when downloading new + * list files, calling Clean() will delete the old ones. + * + * \param Dir The directory to be cleaned out. + * + * \return \b true if the directory exists and is readable. + */ + bool Clean(std::string Dir); + + /** \return the total size in bytes of all the items included in + * this download. + */ + unsigned long long TotalNeeded(); + + /** \return the size in bytes of all non-local items included in + * this download. + */ + unsigned long long FetchNeeded(); + + /** \return the amount of data to be fetched that is already + * present on the filesystem. + */ + unsigned long long PartialPresent(); + + void SetLog(pkgAcquireStatus *Progress) { Log = Progress; } + + /** \brief acquire lock and perform directory setup + * + * \param Lock defines a lock file that should be acquired to ensure + * only one Acquire class is in action at the time or an empty string + * if no lock file should be used. If set also all needed directories + * will be created and setup. + */ + bool GetLock(std::string const &Lock); + + /** \brief Construct a new pkgAcquire. */ + explicit pkgAcquire(pkgAcquireStatus *Log); + pkgAcquire(); + + /** \brief Destroy this pkgAcquire object. + * + * Destroys all queue, method, and item objects associated with + * this download. + */ + virtual ~pkgAcquire(); + + APT_HIDDEN static std::string URIEncode(std::string const &part); + + private: + APT_HIDDEN void Initialize(); +}; + +/** \brief Represents a single download source from which an item + * should be downloaded. + * + * An item may have several associated ItemDescs over its lifetime. + */ +struct APT_PUBLIC pkgAcquire::ItemDesc : public WeakPointable +{ + /** \brief URI from which to download this item. */ + std::string URI; + /** \brief description of this item. */ + std::string Description; + /** \brief shorter description of this item. */ + std::string ShortDesc; + /** \brief underlying item which is to be downloaded. */ + Item *Owner; +}; + /*}}}*/ +/** \brief A single download queue in a pkgAcquire object. {{{ + * + * \todo Why so many protected values? + */ +class APT_PUBLIC pkgAcquire::Queue +{ + friend class pkgAcquire; + friend class pkgAcquire::UriIterator; + friend class pkgAcquire::Worker; + + /** \brief dpointer placeholder (for later in case we need it) */ + void * const d; + + /** \brief The next queue in the pkgAcquire object's list of queues. */ + Queue *Next; + + protected: + + /** \brief A single item placed in this queue. */ + struct QItem : public ItemDesc + { + /** \brief The next item in the queue. */ + QItem *Next; + /** \brief The worker associated with this item, if any. */ + pkgAcquire::Worker *Worker; + + /** \brief The underlying items interested in the download */ + std::vector<Item*> Owners; + + /** \brief How many bytes of the file have been downloaded. Zero + * if the current progress of the file cannot be determined. + */ + unsigned long long CurrentSize = 0; + + /** \brief The total number of bytes to be downloaded. Zero if the + * total size of the final is unknown. + */ + unsigned long long TotalSize = 0; + + /** \brief How much of the file was already downloaded prior to + * starting this worker. + */ + unsigned long long ResumePoint = 0; + + typedef std::vector<Item*>::const_iterator owner_iterator; + + /** \brief Assign the ItemDesc portion of this QItem from + * another ItemDesc + */ + void operator =(pkgAcquire::ItemDesc const &I) + { + URI = I.URI; + Description = I.Description; + ShortDesc = I.ShortDesc; + Owners.clear(); + Owners.push_back(I.Owner); + Owner = I.Owner; + }; + + /** @return the sum of all expected hashes by all owners */ + HashStringList GetExpectedHashes() const; + + /** @return smallest maximum size of all owners */ + unsigned long long GetMaximumSize() const; + + /** \brief get partial files in order */ + void SyncDestinationFiles() const; + + /** @return the custom headers to use for this item */ + std::string Custom600Headers() const; + /** @return the maximum priority of this item */ + int APT_HIDDEN GetPriority() const; + }; + + /** \brief The name of this queue. */ + std::string Name; + + /** \brief The head of the list of items contained in this queue. + * + * \todo why a by-hand list instead of an STL structure? + */ + QItem *Items; + + /** \brief The head of the list of workers associated with this queue. + * + * \todo This is plural because support exists in Queue for + * multiple workers. However, it does not appear that there is + * any way to actually associate more than one worker with a + * queue. + * + * \todo Why not just use a std::set? + */ + pkgAcquire::Worker *Workers; + + /** \brief the download scheduler with which this queue is associated. */ + pkgAcquire *Owner; + + /** \brief The number of entries in this queue that are currently + * being downloaded. + */ + signed long PipeDepth; + + /** \brief The maximum number of entries that this queue will + * attempt to download at once. + */ + unsigned long MaxPipeDepth; + + public: + + /** \brief Insert the given fetch request into this queue. + * + * \return \b true if the queuing was successful. May return + * \b false if the Item is already in the queue + */ + bool Enqueue(ItemDesc &Item); + + /** \brief Remove all fetch requests for the given item from this queue. + * + * \return \b true if at least one request was removed from the queue. + */ + bool Dequeue(Item *Owner); + + /** \brief Locate an item in this queue. + * + * \param URI A URI to match against. + * \param Owner A pkgAcquire::Worker to match against. + * + * \return the first item in the queue whose URI is #URI and that + * is being downloaded by #Owner. + */ + QItem *FindItem(std::string URI,pkgAcquire::Worker *Owner) APT_PURE; + + /** Presumably this should start downloading an item? + * + * \todo Unimplemented. Implement it or remove? + */ + bool ItemStart(QItem *Itm,unsigned long long Size); + + /** \brief Remove the given item from this queue and set its state + * to pkgAcquire::Item::StatDone. + * + * If this is the only queue containing the item, the item is also + * removed from the main queue by calling pkgAcquire::Dequeue. + * + * \param Itm The item to remove. + * + * \return \b true if no errors are encountered. + */ + bool ItemDone(QItem *Itm); + + /** \brief Start the worker process associated with this queue. + * + * If a worker process is already associated with this queue, + * this is equivalent to calling Cycle(). + * + * \return \b true if the startup was successful. + */ + bool Startup(); + + /** \brief Shut down the worker process associated with this queue. + * + * \param Final If \b true, then the process is stopped unconditionally. + * Otherwise, it is only stopped if it does not need cleanup + * as indicated by the pkgAcqMethod::NeedsCleanup member of + * its configuration. + * + * \return \b true. + */ + bool Shutdown(bool Final); + + /** \brief Send idle items to the worker process. + * + * Fills up the pipeline by inserting idle items into the worker's queue. + */ + bool Cycle(); + + /** \brief Check for items that could be enqueued. + * + * Call this after an item placed in multiple queues has gone from + * the pkgAcquire::Item::StatFetching state to the + * pkgAcquire::Item::StatIdle state, to possibly refill an empty queue. + * This is an alias for Cycle(). + * + * \todo Why both this and Cycle()? Are they expected to be + * different someday? + */ + void Bump(); + + /** \brief Create a new Queue. + * + * \param Name The name of the new queue. + * \param Owner The download process that owns the new queue. + */ + Queue(std::string const &Name,pkgAcquire * const Owner); + + /** Shut down all the worker processes associated with this queue + * and empty the queue. + */ + virtual ~Queue(); +}; + /*}}}*/ +/** \brief Iterates over all the URIs being fetched by a pkgAcquire object. {{{*/ +class APT_PUBLIC pkgAcquire::UriIterator +{ + /** \brief dpointer placeholder (for later in case we need it) */ + void * const d; + + /** The next queue to iterate over. */ + pkgAcquire::Queue *CurQ; + /** The item that we currently point at. */ + pkgAcquire::Queue::QItem *CurItem; + + public: + + inline void operator ++() {operator ++(0);}; + + void operator ++(int) + { + CurItem = CurItem->Next; + while (CurItem == 0 && CurQ != 0) + { + CurItem = CurQ->Items; + CurQ = CurQ->Next; + } + }; + + inline pkgAcquire::Queue::QItem const *operator ->() const {return CurItem;}; + inline bool operator !=(UriIterator const &rhs) const {return rhs.CurQ != CurQ || rhs.CurItem != CurItem;}; + inline bool operator ==(UriIterator const &rhs) const {return rhs.CurQ == CurQ && rhs.CurItem == CurItem;}; + + /** \brief Create a new UriIterator. + * + * \param Q The queue over which this UriIterator should iterate. + */ + explicit UriIterator(pkgAcquire::Queue *Q); + virtual ~UriIterator(); +}; + /*}}}*/ +/** \brief Information about the properties of a single acquire method. {{{*/ +struct APT_PUBLIC pkgAcquire::MethodConfig +{ + class Private; + /** \brief dpointer placeholder (for later in case we need it) */ + Private *const d; + + /** \brief The next link on the acquire method list. + * + * \todo Why not an STL container? + */ + MethodConfig *Next; + + /** \brief The name of this acquire method (e.g., http). */ + std::string Access; + + /** \brief The implementation version of this acquire method. */ + std::string Version; + + /** \brief If \b true, only one download queue should be created for this + * method. + */ + bool SingleInstance; + + /** \brief If \b true, this method supports pipelined downloading. */ + bool Pipeline; + + /** \brief If \b true, the worker process should send the entire + * APT configuration tree to the fetch subprocess when it starts + * up. + */ + bool SendConfig; + + /** \brief If \b true, this fetch method does not require network access; + * all files are to be acquired from the local disk. + */ + bool LocalOnly; + + /** \brief If \b true, the subprocess has to carry out some cleanup + * actions before shutting down. + * + * For instance, the cdrom method needs to unmount the CD after it + * finishes. + */ + bool NeedsCleanup; + + /** \brief If \b true, this fetch method acquires files from removable media. */ + bool Removable; + + /** \brief Set up the default method parameters. + * + * All fields are initialized to NULL, "", or \b false as + * appropriate. + */ + MethodConfig(); + + APT_HIDDEN bool GetAuxRequests() const; + APT_HIDDEN void SetAuxRequests(bool const value); + APT_HIDDEN bool GetSendURIEncoded() const; + APT_HIDDEN void SetSendURIEncoded(bool const value); + + virtual ~MethodConfig(); +}; + /*}}}*/ +/** \brief A monitor object for downloads controlled by the pkgAcquire class. {{{ + * + * \todo Why protected members? + */ +class APT_PUBLIC pkgAcquireStatus +{ + /** \brief dpointer placeholder (for later in case we need it) */ + void * const d; + + protected: + + /** \brief The last time at which this monitor object was updated. */ + struct timeval Time; + + /** \brief The time at which the download started. */ + struct timeval StartTime; + + /** \brief The number of bytes fetched as of the previous call to + * pkgAcquireStatus::Pulse, including local items. + */ + unsigned long long LastBytes; + + /** \brief The current rate of download as of the most recent call + * to pkgAcquireStatus::Pulse, in bytes per second. + */ + unsigned long long CurrentCPS; + + /** \brief The number of bytes fetched as of the most recent call + * to pkgAcquireStatus::Pulse, including local items. + */ + unsigned long long CurrentBytes; + + /** \brief The total number of bytes that need to be fetched. + * + * \warning This member is inaccurate, as new items might be + * enqueued while the download is in progress! + */ + unsigned long long TotalBytes; + + /** \brief The total number of bytes accounted for by items that + * were successfully fetched. + */ + unsigned long long FetchedBytes; + + /** \brief The amount of time that has elapsed since the download + * started. + */ + unsigned long long ElapsedTime; + + /** \brief The total number of items that need to be fetched. + * + * \warning This member is inaccurate, as new items might be + * enqueued while the download is in progress! + */ + unsigned long TotalItems; + + /** \brief The number of items that have been successfully downloaded. */ + unsigned long CurrentItems; + + /** \brief The estimated percentage of the download (0-100) + */ + double Percent; + + public: + + /** \brief If \b true, the download scheduler should call Pulse() + * at the next available opportunity. + */ + bool Update; + + /** \brief If \b true, extra Pulse() invocations will be performed. + * + * With this option set, Pulse() will be called every time that a + * download item starts downloading, finishes downloading, or + * terminates with an error. + */ + bool MorePulses; + + /** \brief Invoked when a local or remote file has been completely fetched. + * + * \param Size The size of the file fetched. + * + * \param ResumePoint How much of the file was already fetched. + */ + virtual void Fetched(unsigned long long Size,unsigned long long ResumePoint); + + /** \brief Invoked when the user should be prompted to change the + * inserted removable media. + * + * This method should not return until the user has confirmed to + * the user interface that the media change is complete. + * + * \param Media The name of the media type that should be changed. + * + * \param Drive The identifying name of the drive whose media + * should be changed. + * + * \return \b true if the user confirms the media change, \b + * false if it is cancelled. + * + * \todo This is a horrible blocking monster; it should be CPSed + * with prejudice. + */ + virtual bool MediaChange(std::string Media,std::string Drive) = 0; + + struct ReleaseInfoChange + { + std::string Type; /*!< Type of the change like "Origin", "Codename", "Version", … */ + std::string From; /*!< old value */ + std::string To; /*!< new value */ + std::string Message; /*!< translated message describing the change */ + bool DefaultAction; /*!< true if the change is informational, false if it must be explicitly confirmed */ + }; + /** \brief ask the user for confirmation of changes to infos about a repository + * + * This method should present the user with a choice of accepting the change + * or not and indicate the user opinion via the return value. If DefaultAction is true + * it is acceptable to only notify the user about the change, but to accept the change + * automatically on behalf of the user. + * + * The default implementation will fail if any Change has DefaultAction == false. Regardless of + * success it will print for each change the message attached to it via GlobalError either as an + * error (if DefaultAction == false) or as a notice otherwise. + * + * @param LastRelease can be used to extract further information from the previous Release file + * @param CurrentRelease can be used to extract further information from the current Release file + * @param Changes is an array of changes alongside explanatory messages + * which should be presented in some way to the user. + * @return \b true if all changes are accepted by user, otherwise or if user can't be asked \b false + */ + virtual bool ReleaseInfoChanges(metaIndex const * const LastRelease, metaIndex const * const CurrentRelease, std::vector<ReleaseInfoChange> &&Changes); + APT_HIDDEN static bool ReleaseInfoChangesAsGlobalErrors(std::vector<ReleaseInfoChange> &&Changes); + + /** \brief Invoked when an item is confirmed to be up-to-date. + + * For instance, when an HTTP download is informed that the file on + * the server was not modified. + */ + virtual void IMSHit(pkgAcquire::ItemDesc &/*Itm*/) {}; + + /** \brief Invoked when some of an item's data is fetched. */ + virtual void Fetch(pkgAcquire::ItemDesc &/*Itm*/) {}; + + /** \brief Invoked when an item is successfully and completely fetched. */ + virtual void Done(pkgAcquire::ItemDesc &/*Itm*/) {}; + + /** \brief Invoked when the process of fetching an item encounters + * a fatal error. + */ + virtual void Fail(pkgAcquire::ItemDesc &/*Itm*/) {}; + + /** \brief Periodically invoked while the Acquire process is underway. + * + * Subclasses should first call pkgAcquireStatus::Pulse(), then + * update their status output. The download process is blocked + * while Pulse() is being called. + * + * \return \b false if the user asked to cancel the whole Acquire process. + * + * \see pkgAcquire::Run + */ + virtual bool Pulse(pkgAcquire *Owner); + + /** \brief Invoked when the Acquire process starts running. */ + virtual void Start(); + + /** \brief Invoked when the Acquire process stops running. */ + virtual void Stop(); + + /** \brief Initialize all counters to 0 and the time to the current time. */ + pkgAcquireStatus(); + virtual ~pkgAcquireStatus(); +}; + /*}}}*/ +/** @} */ + +#endif |