Merge branch 'master' of git.taler.net:/var/git/mint

1 files changed, 0 insertions, 974 deletions

diff --git a/src/mint/mint_db.h b/src/mint/mint_db.h
deleted file mode 100644
index 9818172af..000000000
--- a/src/mint/mint_db.h
+++ /dev/null
@@ -1,974 +0,0 @@
-/*
-  This file is part of TALER
-  Copyright (C) 2014, 2015 Christian Grothoff (and other contributing authors)
-
-  TALER is free software; you can redistribute it and/or modify it under the
-  terms of the GNU General Public License as published by the Free Software
-  Foundation; either version 3, or (at your option) any later version.
-
-  TALER is distributed in the hope that it will be useful, but WITHOUT ANY
-  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
-  A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License along with
-  TALER; see the file COPYING.  If not, If not, see <http://www.gnu.org/licenses/>
-*/
-/**
- * @file mint/mint_db.h
- * @brief Low-level (statement-level) database access for the mint
- * @author Florian Dold
- * @author Christian Grothoff
- */
-#ifndef MINT_DB_H
-#define MINT_DB_H
-
-#include <libpq-fe.h>
-#include <microhttpd.h>
-#include <gnunet/gnunet_util_lib.h>
-#include "taler_util.h"
-
-#define TALER_TEMP_SCHEMA_NAME "taler_temporary"
-
-/**
- * Initialize database subsystem.
- *
- * @param connection_cfg configuration for the DB
- * @return #GNUNET_OK on success
- */
-int
-TALER_MINT_DB_init (const char *connection_cfg);
-
-
-/**
- * Get the thread-local database-handle.
- * Connect to the db if the connection does not exist yet.
- *
- * @param temporary #GNUNET_YES to use a temporary schema; #GNUNET_NO to use the
- *        database default one
- * @param the database connection, or NULL on error
- */
-PGconn *
-TALER_MINT_DB_get_connection (int temporary);
-
-
-/**
- * Drop the temporary taler schema.  This is only useful for testcases
- *
- * @return #GNUNET_OK upon success; #GNUNET_SYSERR upon failure
- */
-int
-TALER_MINT_DB_drop_temporary (PGconn *db);
-
-
-/**
- * Create the necessary tables if they are not present
- *
- * @param temporary should we use a temporary schema
- * @return #GNUNET_OK upon success; #GNUNET_SYSERR upon failure
- */
-int
-TALER_MINT_DB_create_tables (int temporary);
-
-/**
- * Setup prepared statements.  FIXME: should this be part of the API,
- * or just internal to "TALER_MINT_DB_get_connection()"?
- *
- * @param db_conn connection handle to initialize
- * @return #GNUNET_OK on success, #GNUNET_SYSERR on failure
- */
-int
-TALER_MINT_DB_prepare (PGconn *db_conn);
-
-
-/**
- * Start a transaction.
- *
- * @param db_conn connection to use
- * @return #GNUNET_OK on success
- */
-int
-TALER_MINT_DB_transaction (PGconn *db_conn);
-
-
-/**
- * Commit a transaction.
- *
- * @param db_conn connection to use
- * @return #GNUNET_OK on success
- */
-int
-TALER_MINT_DB_commit (PGconn *db_conn);
-
-
-/**
- * Abort/rollback a transaction.
- *
- * @param db_conn connection to use
- */
-void
-TALER_MINT_DB_rollback (PGconn *db_conn);
-
-
-/**
- * Information we keep on a bank transfer that
- * established a reserve.
- */
-struct BankTransfer
-{
-
-  /**
-   * Public key of the reserve that was filled.
-   */
-  struct GNUNET_CRYPTO_EddsaPublicKey reserve_pub;
-
-  /**
-   * Amount that was transferred to the mint.
-   */
-  struct TALER_Amount amount;
-
-  /**
-   * Detailed wire information about the transaction.
-   */
-  const json_t *wire;
-
-};
-
-
-/* FIXME: add functions to add bank transfers to our DB
-   (and to test if we already did add one) (#3633) */
-
-/**
- * A summary of a Reserve
- */
-struct Reserve
-{
-  /**
-   * The reserve's public key.  This uniquely identifies the reserve
-   */
-  struct GNUNET_CRYPTO_EddsaPublicKey *pub;
-
-  /**
-   * The balance amount existing in the reserve
-   */
-  struct TALER_Amount balance;
-
-  /**
-   * The expiration date of this reserve
-   */
-  struct GNUNET_TIME_Absolute expiry;
-};
-
-
-/**
- * Information we keep for a withdrawn coin to reproduce
- * the /withdraw operation if needed, and to have proof
- * that a reserve was drained by this amount.
- */
-struct CollectableBlindcoin
-{
-
-  /**
-   * Our signature over the (blinded) coin.
-   */
-  struct GNUNET_CRYPTO_rsa_Signature *sig;
-
-  /**
-   * Denomination key (which coin was generated).
-   */
-  struct GNUNET_CRYPTO_rsa_PublicKey *denom_pub;
-
-  /**
-   * Public key of the reserve that was drained.
-   */
-  struct GNUNET_CRYPTO_EddsaPublicKey reserve_pub;
-
-  /**
-   * Hash over the blinded message, needed to verify
-   * the @e reserve_sig.
-   */
-  struct GNUNET_HashCode h_coin_envelope;
-
-  /**
-   * Signature confirming the withdrawl, matching @e reserve_pub,
-   * @e denom_pub and @e h_coin_envelope.
-   */
-  struct GNUNET_CRYPTO_EddsaSignature reserve_sig;
-};
-
-
-/**
- * Get the summary of a reserve.
- *
- * @param db the database connection handle
- * @param reserve the reserve data.  The public key of the reserve should be set
- *          in this structure; it is used to query the database.  The balance
- *          and expiration are then filled accordingly.
- * @return #GNUNET_OK upon success; #GNUNET_SYSERR upon failure
- */
-int
-TALER_MINT_DB_reserve_get (PGconn *db,
-                           struct Reserve *reserve);
-
-
-/**
- * Insert a incoming transaction into reserves.  New reserves are also created
- * through this function.
- *
- * @param db the database connection handle
- * @param reserve the reserve structure.  The public key of the reserve should
- *          be set here.  Upon successful execution of this function, the
- *          balance and expiration of the reserve will be updated.
- * @param balance the amount that has to be added to the reserve
- * @param expiry the new expiration time for the reserve
- * @return #GNUNET_OK upon success; #GNUNET_SYSERR upon failures
- */
-int
-TALER_MINT_DB_reserves_in_insert (PGconn *db,
-                                  struct Reserve *reserve,
-                                  const struct TALER_Amount balance,
-                                  const struct GNUNET_TIME_Absolute expiry);
-
-
-/**
- * Locate the response for a /withdraw request under the
- * key of the hash of the blinded message.
- *
- * @param db_conn database connection to use
- * @param h_blind hash of the blinded message
- * @param collectable corresponding collectable coin (blind signature)
- *                    if a coin is found
- * @return #GNUNET_SYSERR on internal error
- *         #GNUNET_NO if the collectable was not found
- *         #GNUNET_YES on success
- */
-int
-TALER_MINT_DB_get_collectable_blindcoin (PGconn *db_conn,
-                                         const struct GNUNET_HashCode *h_blind,
-                                         struct CollectableBlindcoin *collectable);
-
-
-/**
- * Store collectable bit coin under the corresponding
- * hash of the blinded message.
- *
- * @param db_conn database connection to use
- * @param h_blind hash of the blinded message
- * @param collectable corresponding collectable coin (blind signature)
- *                    if a coin is found
- * @return #GNUNET_SYSERR on internal error
- *         #GNUNET_NO if the collectable was not found
- *         #GNUNET_YES on success
- */
-int
-TALER_MINT_DB_insert_collectable_blindcoin (PGconn *db_conn,
-                                            const struct GNUNET_HashCode *h_blind,
-                                            const struct CollectableBlindcoin *collectable);
-
-
-
-/**
- * Types of operations on a reserved.
- */
-enum TALER_MINT_DB_ReserveOperation
-{
-  /**
-   * Money was deposited into the reserve via a bank transfer.
-   */
-  TALER_MINT_DB_RO_BANK_TO_MINT = 0,
-
-  /**
-   * A Coin was withdrawn from the reserve using /withdraw.
-   */
-  TALER_MINT_DB_RO_WITHDRAW_COIN = 1
-};
-
-
-/**
- * Reserve history as a linked list.  Lists all of the transactions
- * associated with this reserve (such as the bank transfers that
- * established the reserve and all /withdraw operations we have done
- * since).
- */
-struct ReserveHistory
-{
-
-  /**
-   * Next entry in the reserve history.
-   */
-  struct ReserveHistory *next;
-
-  /**
-   * Type of the event, determins @e details.
-   */
-  enum TALER_MINT_DB_ReserveOperation type;
-
-  /**
-   * Details of the operation, depending on @e type.
-   */
-  union
-  {
-
-    /**
-     * Details about a bank transfer to the mint.
-     */
-    struct BankTransfer *bank;
-
-    /**
-     * Details about a /withdraw operation.
-     */
-    struct CollectableBlindcoin *withdraw;
-
-  } details;
-
-};
-
-
-/**
- * Get all of the transaction history associated with the specified
- * reserve.
- *
- * @param db_conn connection to use
- * @param reserve_pub public key of the reserve
- * @return known transaction history (NULL if reserve is unknown)
- */
-struct ReserveHistory *
-TALER_MINT_DB_get_reserve_history (PGconn *db_conn,
-                                   const struct GNUNET_CRYPTO_EddsaPublicKey *reserve_pub);
-
-
-/**
- * Free memory associated with the given reserve history.
- *
- * @param rh history to free.
- */
-void
-TALER_MINT_DB_free_reserve_history (struct ReserveHistory *rh);
-
-
-/**
- * Specification for a /deposit operation.
- */
-struct Deposit
-{
-  /**
-   * Information about the coin that is being deposited.
-   */
-  struct TALER_CoinPublicInfo coin;
-
-  /**
-   * ECDSA signature affirming that the customer intends
-   * this coin to be deposited at the merchant identified
-   * by @e h_wire in relation to the contract identified
-   * by @e h_contract.
-   */
-  struct GNUNET_CRYPTO_EcdsaSignature csig;
-
-  /**
-   * Public key of the merchant.  Enables later identification
-   * of the merchant in case of a need to rollback transactions.
-   */
-  struct GNUNET_CRYPTO_EddsaPublicKey merchant_pub;
-
-  /**
-   * Hash over the contract between merchant and customer
-   * (remains unknown to the Mint).
-   */
-  struct GNUNET_HashCode h_contract;
-
-  /**
-   * Hash of the (canonical) representation of @e wire, used
-   * to check the signature on the request.  Generated by
-   * the mint from the detailed wire data provided by the
-   * merchant.
-   */
-  struct GNUNET_HashCode h_wire;
-
-  /**
-   * Detailed wire information for executing the transaction.
-   */
-  const json_t *wire;
-
-  /**
-   * Merchant-generated transaction ID to detect duplicate
-   * transactions.
-   */
-  uint64_t transaction_id;
-
-  /**
-   * Fraction of the coin's remaining value to be deposited.
-   * The coin is identified by @e coin_pub.
-   */
-  struct TALER_Amount amount;
-
-};
-
-
-/**
- * Check if we have the specified deposit already in the database.
- *
- * @param db_conn database connection
- * @param deposit deposit to search for
- * @return #GNUNET_YES if we know this operation,
- *         #GNUNET_NO if this deposit is unknown to us,
- *         #GNUNET_SYSERR on internal error
- */
-int
-TALER_MINT_DB_have_deposit (PGconn *db_conn,
-                            const struct Deposit *deposit);
-
-
-/**
- * Insert information about deposited coin into the
- * database.
- *
- * @param db_conn connection to the database
- * @param deposit deposit information to store
- * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
- */
-int
-TALER_MINT_DB_insert_deposit (PGconn *db_conn,
-                              const struct Deposit *deposit);
-
-
-
-/**
- * Global information for a refreshing session.  Includes
- * dimensions of the operation, security parameters and
- * client signatures from "/refresh/melt" and "/refresh/commit".
- */
-struct RefreshSession
-{
-  /**
-   * Signature over the commitments by the client,
-   * only valid if @e has_commit_sig is set.
-   */
-  struct GNUNET_CRYPTO_EddsaSignature commit_sig;
-
-  /**
-   * Hash over coins to melt and coins to create of the
-   * refresh session.
-   */
-  struct GNUNET_HashCode session_hash;
-
-  /**
-   * Signature over the melt by the client.
-   */
-  struct GNUNET_CRYPTO_EddsaSignature melt_sig;
-
-  /**
-   * Number of coins we are melting.
-   */
-  uint16_t num_oldcoins;
-
-  /**
-   * Number of new coins we are creating.
-   */
-  uint16_t num_newcoins;
-
-  /**
-   * Number of parallel operations we perform for the cut and choose.
-   * (must be greater or equal to three for security).  0 if not yet
-   * known.
-   */
-  uint16_t kappa;
-
-  /**
-   * Index (smaller @e kappa) which the mint has chosen to not
-   * have revealed during cut and choose.
-   */
-  uint16_t noreveal_index;
-
-};
-
-
-/**
- * Lookup refresh session data under the given public key.
- *
- * @param db_conn database handle to use
- * @param refresh_session_pub public key to use for the lookup
- * @param session[OUT] where to store the result
- * @return #GNUNET_YES on success,
- *         #GNUNET_NO if not found,
- *         #GNUNET_SYSERR on DB failure
- */
-int
-TALER_MINT_DB_get_refresh_session (PGconn *db_conn,
-                                   const struct GNUNET_CRYPTO_EddsaPublicKey *refresh_session_pub,
-                                   struct RefreshSession *session);
-
-
-/**
- * Store new refresh session data under the given public key.
- *
- * @param db_conn database handle to use
- * @param refresh_session_pub public key to use to locate the session
- * @param session session data to store
- * @return #GNUNET_YES on success,
- *         #GNUNET_SYSERR on DB failure
- */
-int
-TALER_MINT_DB_create_refresh_session (PGconn *db_conn,
-                                      const struct GNUNET_CRYPTO_EddsaPublicKey *session_pub,
-                                      const struct RefreshSession *session);
-
-
-/**
- * Specification for coin in a /refresh/melt operation.
- */
-struct RefreshMelt
-{
-  /**
-   * Information about the coin that is being melted.
-   */
-  struct TALER_CoinPublicInfo coin;
-
-  /**
-   * Signature over the melting operation.
-   */
-  struct GNUNET_CRYPTO_EcdsaSignature coin_sig;
-
-  /**
-   * Which melting operation should the coin become a part of.
-   */
-  struct GNUNET_HashCode melt_hash;
-
-  /**
-   * How much value is being melted?
-   * This amount includes the fees, so the final amount contributed
-   * to the melt is this value minus the fee for melting the coin.
-   */
-  struct TALER_Amount amount;
-
-};
-
-
-/**
- * Store the given /refresh/melt request in the database.
- *
- * @param db_conn database connection
- * @param session session key of the melt operation
- * @param oldcoin_index index of the coin to store
- * @param melt coin melt operation details to store
- * @return #GNUNET_OK on success
- *         #GNUNET_SYSERR on internal error
- */
-int
-TALER_MINT_DB_insert_refresh_melt (PGconn *db_conn,
-                                   const struct GNUNET_CRYPTO_EddsaPublicKey *session,
-                                   uint16_t oldcoin_index,
-                                   const struct RefreshMelt *melt);
-
-
-
-/**
- * Get information about melted coin details from the database.
- *
- * @param db_conn database connection
- * @param session session key of the melt operation
- * @param oldcoin_index index of the coin to retrieve
- * @param melt melt data to fill in
- * @return #GNUNET_OK on success
- *         #GNUNET_SYSERR on internal error
- */
-int
-TALER_MINT_DB_get_refresh_melt (PGconn *db_conn,
-                                const struct GNUNET_CRYPTO_EddsaPublicKey *session,
-                                uint16_t oldcoin_index,
-                                struct RefreshMelt *melt);
-
-
-/**
- * Store in the database which coin(s) we want to create
- * in a given refresh operation.
- *
- * @param db_conn database connection
- * @param session_pub refresh session key
- * @param newcoin_index index of the coin to generate
- * @param denom_pub denomination of the coin to create
- * @return #GNUNET_OK on success
- *         #GNUNET_SYSERR on internal error
- */
-int
-TALER_MINT_DB_insert_refresh_order (PGconn *db_conn,
-                                    const struct GNUNET_CRYPTO_EddsaPublicKey *session_pub,
-                                    uint16_t newcoin_index,
-                                    const struct GNUNET_CRYPTO_rsa_PublicKey *denom_pub);
-
-
-/**
- * Lookup in the database the @a newcoin_index coin that we want to
- * create in the given refresh operation.
- *
- * @param db_conn database connection
- * @param session_pub refresh session key
- * @param newcoin_index index of the coin to generate
- * @param denom_pub denomination of the coin to create
- * @return NULL on error (not found or internal error)
- */
-struct GNUNET_CRYPTO_rsa_PublicKey *
-TALER_MINT_DB_get_refresh_order (PGconn *db_conn,
-                                 const struct GNUNET_CRYPTO_EddsaPublicKey *session_pub,
-                                 uint16_t newcoin_index);
-
-
-/**
- * We have as many `struct RefreshCommitCoin` as there are new
- * coins being created by the refresh (for each of the kappa
- * sets).  These are the coins we ask the mint to sign if the
- * respective set is selected.
- */
-struct RefreshCommitCoin
-{
-
-  /**
-   * Encrypted data allowing those able to decrypt it to derive
-   * the private keys of the new coins created by the refresh.
-   */
-  struct TALER_RefreshLinkEncrypted *refresh_link;
-
-  /**
-   * Blinded message to be signed (in envelope), with @e coin_env_size bytes.
-   */
-  char *coin_ev;
-
-  /**
-   * Number of bytes in @e coin_ev.
-   */
-  size_t coin_ev_size;
-
-};
-
-
-/**
- * Store information about the commitment of the
- * given coin for the given refresh session in the database.
- *
- * @param db_conn database connection to use
- * @param refresh_session_pub refresh session this commitment belongs to
- * @param i set index (1st dimension)
- * @param j coin index (2nd dimension), corresponds to refreshed (new) coins
- * @param commit_coin coin commitment to store
- * @return #GNUNET_OK on success
- *         #GNUNET_SYSERR on error
- */
-int
-TALER_MINT_DB_insert_refresh_commit_coin (PGconn *db_conn,
-                                          const struct GNUNET_CRYPTO_EddsaPublicKey *refresh_session_pub,
-                                          unsigned int i,
-                                          unsigned int j,
-                                          const struct RefreshCommitCoin *commit_coin);
-
-
-/**
- * Obtain information about the commitment of the
- * given coin of the given refresh session from the database.
- *
- * @param db_conn database connection to use
- * @param refresh_session_pub refresh session the commitment belongs to
- * @param i set index (1st dimension)
- * @param j coin index (2nd dimension), corresponds to refreshed (new) coins
- * @param commit_coin[OUT] coin commitment to return
- * @return #GNUNET_OK on success
- *         #GNUNET_NO if not found
- *         #GNUNET_SYSERR on error
- */
-int
-TALER_MINT_DB_get_refresh_commit_coin (PGconn *db_conn,
-                                       const struct GNUNET_CRYPTO_EddsaPublicKey *refresh_session_pub,
-                                       unsigned int i,
-                                       unsigned int j,
-                                       struct RefreshCommitCoin *commit_coin);
-
-
-/**
- * For each (old) coin being melted, we have a `struct
- * RefreshCommitLink` that allows the user to find the shared secret
- * to decrypt the respective refresh links for the new coins in the
- * `struct RefreshCommitCoin`.
- */
-struct RefreshCommitLink
-{
-  /**
-   * Transfer public key (FIXME: explain!)
-   */
-  struct GNUNET_CRYPTO_EcdsaPublicKey transfer_pub;
-
-  /**
-   * Encrypted shared secret to decrypt the link.
-   */
-  struct TALER_EncryptedLinkSecret shared_secret_enc;
-};
-
-
-/**
- * Store the commitment to the given (encrypted) refresh link data
- * for the given refresh session.
- *
- * @param db_conn database connection to use
- * @param refresh_session_pub public key of the refresh session this
- *        commitment belongs with
- * @param i set index (1st dimension)
- * @param j coin index (2nd dimension), corresponds to melted (old) coins
- * @param commit_link link information to store
- * @return #GNUNET_SYSERR on internal error, #GNUNET_OK on success
- */
-int
-TALER_MINT_DB_insert_refresh_commit_link (PGconn *db_conn,
-                                          const struct GNUNET_CRYPTO_EddsaPublicKey *refresh_session_pub,
-                                          unsigned int i,
-                                          unsigned int j,
-                                          const struct RefreshCommitLink *commit_link);
-
-/**
- * Obtain the commited (encrypted) refresh link data
- * for the given refresh session.
- *
- * @param db_conn database connection to use
- * @param refresh_session_pub public key of the refresh session this
- *        commitment belongs with
- * @param i set index (1st dimension)
- * @param j coin index (2nd dimension), corresponds to melted (old) coins
- * @param cc[OUT] link information to return
- * @return #GNUNET_SYSERR on internal error,
- *         #GNUNET_NO if commitment was not found
- *         #GNUNET_OK on success
- */
-int
-TALER_MINT_DB_get_refresh_commit_link (PGconn *db_conn,
-                                       const struct GNUNET_CRYPTO_EddsaPublicKey *refresh_session_pub,
-                                       unsigned int i,
-                                       unsigned int j,
-                                       struct RefreshCommitLink *cc);
-
-
-/**
- * Insert signature of a new coin generated during refresh into
- * the database indexed by the refresh session and the index
- * of the coin.  This data is later used should an old coin
- * be used to try to obtain the private keys during "/refresh/link".
- *
- * @param db_conn database connection
- * @param session_pub refresh session
- * @param newcoin_index coin index
- * @param ev_sig coin signature
- * @return #GNUNET_OK on success
- */
-int
-TALER_MINT_DB_insert_refresh_collectable (PGconn *db_conn,
-                                          const struct GNUNET_CRYPTO_EddsaPublicKey *session_pub,
-                                          uint16_t newcoin_index,
-                                          const struct GNUNET_CRYPTO_rsa_Signature *ev_sig);
-
-
-/**
- * Linked list of refresh information linked to a coin.
- */
-struct LinkDataList
-{
-  /**
-   * Information is stored in a NULL-terminated linked list.
-   */
-  struct LinkDataList *next;
-
-  /**
-   * Link data, used to recover the private key of the coin
-   * by the owner of the old coin.
-   */
-  struct TALER_RefreshLinkEncrypted *link_data_enc;
-
-  /**
-   * Denomination public key, determines the value of the coin.
-   */
-  struct GNUNET_CRYPTO_rsa_PublicKey *denom_pub;
-
-  /**
-   * Signature over the blinded envelope.
-   */
-  struct GNUNET_CRYPTO_rsa_Signature *ev_sig;
-};
-
-
-/**
- * Obtain the link data of a coin, that is the encrypted link
- * information, the denomination keys and the signatures.
- *
- * @param db_conn database connection
- * @param coin_pub public key to use to retrieve linkage data
- * @return all known link data for the coin
- */
-struct LinkDataList *
-TALER_db_get_link (PGconn *db_conn,
-                   const struct GNUNET_CRYPTO_EcdsaPublicKey *coin_pub);
-
-
-/**
- * Free memory of the link data list.
- *
- * @param ldl link data list to release
- */
-void
-TALER_db_link_data_list_free (struct LinkDataList *ldl);
-
-
-/**
- * Obtain shared secret and transfer public key from the public key of
- * the coin.  This information and the link information returned by
- * #TALER_db_get_link() enable the owner of an old coin to determine
- * the private keys of the new coins after the melt.
- *
- *
- * @param db_conn database connection
- * @param coin_pub public key of the coin
- * @param transfer_pub[OUT] public transfer key
- * @param shared_secret_enc[OUT] set to shared secret
- * @return #GNUNET_OK on success,
- *         #GNUNET_NO on failure (not found)
- *         #GNUNET_SYSERR on internal failure (database issue)
- */
-int
-TALER_db_get_transfer (PGconn *db_conn,
-                       const struct GNUNET_CRYPTO_EcdsaPublicKey *coin_pub,
-                       struct GNUNET_CRYPTO_EcdsaPublicKey *transfer_pub,
-                       struct TALER_EncryptedLinkSecret *shared_secret_enc);
-
-
-/**
- * Specification for a /lock operation.
- */
-struct Lock
-{
-  /**
-   * Information about the coin that is being melted.
-   */
-  struct TALER_CoinPublicInfo coin;
-
-  /**
-   * Signature over the melting operation.
-   */
-  const struct GNUNET_CRYPTO_EcdsaSignature coin_sig;
-
-  /**
-   * How much value is being melted?
-   */
-  struct TALER_Amount amount;
-
-  // FIXME: more needed...
-};
-
-
-/**
- * Test if the given /lock request is known to us.
- *
- * @param db_conn database connection
- * @param lock lock operation
- * @return #GNUNET_YES if known,
- *         #GNUENT_NO if not,
- *         #GNUNET_SYSERR on internal error
- */
-int
-TALER_MINT_DB_have_lock (PGconn *db_conn,
-                         const struct Lock *lock);
-
-
-/**
- * Store the given /lock request in the database.
- *
- * @param db_conn database connection
- * @param lock lock operation
- * @return #GNUNET_OK on success
- *         #GNUNET_SYSERR on internal error
- */
-int
-TALER_MINT_DB_insert_lock (PGconn *db_conn,
-                           const struct Lock *lock);
-
-
-/**
- * Enumeration to classify the different types of transactions
- * that can be done with a coin.
- */
-enum TALER_MINT_DB_TransactionType
-{
-  /**
-   * /deposit operation.
-   */
-  TALER_MINT_DB_TT_DEPOSIT = 0,
-
-  /**
-   * /refresh/melt operation.
-   */
-  TALER_MINT_DB_TT_REFRESH_MELT = 1,
-
-  /**
-   * /lock operation.
-   */
-  TALER_MINT_DB_TT_LOCK = 2
-};
-
-
-/**
- * List of transactions we performed for a particular coin.
- */
-struct TALER_MINT_DB_TransactionList
-{
-
-  /**
-   * Next pointer in the NULL-terminated linked list.
-   */
-  struct TALER_MINT_DB_TransactionList *next;
-
-  /**
-   * Type of the transaction, determines what is stored in @e details.
-   */
-  enum TALER_MINT_DB_TransactionType type;
-
-  /**
-   * Details about the transaction, depending on @e type.
-   */
-  union
-  {
-
-    /**
-     * Details if transaction was a /deposit operation.
-     */
-    struct Deposit *deposit;
-
-    /**
-     * Details if transaction was a /refresh/melt operation.
-     */
-    struct RefreshMelt *melt;
-
-    /**
-     * Details if transaction was a /lock operation.
-     */
-    struct Lock *lock;
-
-  } details;
-
-};
-
-
-/**
- * Compile a list of all (historic) transactions performed
- * with the given coin (/refresh/melt and /deposit operations).
- *
- * @param db_conn database connection
- * @param coin_pub coin to investigate
- * @return list of transactions, NULL if coin is fresh
- */
-struct TALER_MINT_DB_TransactionList *
-TALER_MINT_DB_get_coin_transactions (PGconn *db_conn,
-                                     const struct GNUNET_CRYPTO_EcdsaPublicKey *coin_pub);
-
-
-/**
- * Free linked list of transactions.
- *
- * @param list list to free
- */
-void
-TALER_MINT_DB_free_coin_transaction_list (struct TALER_MINT_DB_TransactionList *list);
-
-
-
-#endif /* _NEURO_MINT_DB_H */