/*
 * Copyright (C) 1996-2021 The Squid Software Foundation and contributors
 *
 * Squid software is distributed under GPLv2+ license and includes
 * contributions from numerous individuals and organizations.
 * Please see the COPYING and CONTRIBUTORS files for details.
 */

#ifndef SQUID_SRC_XACTION_INITIATOR_H
#define SQUID_SRC_XACTION_INITIATOR_H

/// identifies a protocol agent or Squid feature initiating transactions
class XactionInitiator {
public:
    /// transaction triggers
    enum Initiator {
        initUnknown = 0,
        initClient = 1 << 0, ///< HTTP or FTP client
        initPeerPool = 1 << 1, ///< PeerPool manager
        initCertFetcher = 1 << 2, ///< Missing intermediate certificates fetching code
        initEsi = 1 << 3, ///< ESI processing code
        initCacheDigest = 1 << 4, ///< Cache Digest fetching code
        initHtcp = 1<< 5, ///< HTCP client
        initIcp = 1 << 6, ///< the ICP/neighbors subsystem
        initIcmp = 1 << 7, ///< the ICMP RTT database (NetDB) neighbors exchange subsystem
        initAsn = 1 << 8, ///< the ASN db subsystem
        initIpc = 1 << 9, ///< the IPC subsystem
        initAdaptation = 1 << 10,  ///< ICAP/ECAP requests generated by Squid
        initIcon = 1 << 11, ///< internal icons
        initPeerMcast = 1 << 12, ///< neighbor multicast
        initServer = 1 << 13, ///< HTTP/2 push request (not yet supported by Squid)

        initAdaptationOrphan_ = 1 << 31 ///< eCAP-created HTTP message w/o an associated HTTP transaction (not ACL-detectable)
    };

    typedef uint32_t Initiators; ///< Initiator set

    // this class is a just a trivial wrapper so we allow explicit conversions
    XactionInitiator(Initiator i) : initiator(i) {}

    /// whether this initiator belongs to the given set
    bool in(Initiators setOfInitiators) const {return (initiator & setOfInitiators) != 0;}

    /// whether the transaction was initiated by an internal subsystem
    bool internalClient() const {
        return (initiator & InternalInitiators()) != 0;
    }

    /// internally generated requests
    static Initiators InternalInitiators() {
        return initPeerPool | initCertFetcher | initEsi | initCacheDigest | initIcp | initIcmp | initIpc | initAdaptation | initIcon | initPeerMcast;
    }

    /// all initiators
    static Initiators AllInitiators() {
        return 0xFFFFFFFF;
    }

    static Initiators ParseInitiators(const char *name);

private:
    XactionInitiator() {}

    Initiator initiator;
};

#endif // SQUID_SRC_XACTION_INITIATOR_H