remove callbacks

We want to migrate this crate into a direction
where we provide out-of-the-box all of the
ways in which a header and / or block could
be analyzed. The user can then switch these
analyses on or off. For this functionality,
we don't need the overkill flexibility of
trait objects.

The goal is to provide a much more authoritative
block analysis tool, closer to an enhanced block
explorer than the ad-hoc analyses implemented before.

Author: dspicher

README.md

@@ -21,14 +21,7 @@ If something doesn't match the parser exits.
 
 ## Usage
 ```
-Usage: bitcoin-blockparser [OPTIONS] [COMMAND]
-
-Commands:
-  unspentcsvdump  Dumps the unspent outputs to CSV file
-  simplestats     Shows various Blockchain stats
-  balances        Dumps all addresses with non-zero balance to CSV file
-  opreturn        Shows embedded OP_RETURN data that is representable as UTF8
-  help            Print this message or the help of the given subcommand(s)
+Usage: bitcoin-blockparser [OPTIONS]
 
 Options:
       --verify
@@ -48,31 +41,6 @@ Options:
   -V, --version
           Print version
 ```
-### Example
-
-To make a `unspentcsvdump` of the Bitcoin blockchain your command would look like this:
-```
-# ./blockparser unspentcsvdump /path/to/dump/
-[6:02:53] INFO - main: Starting bitcoin-blockparser v0.7.0 ...
-[6:02:53] INFO - index: Reading index from ~/.bitcoin/blocks/index ...
-[6:02:54] INFO - index: Got longest chain with 639626 blocks ...
-[6:02:54] INFO - blkfile: Reading files from ~/.bitcoin/blocks ...
-[6:02:54] INFO - parser: Parsing Bitcoin blockchain (range=0..) ...
-[6:02:54] INFO - callback: Using `unspentcsvdump` with dump folder: /path/to/dump ...
-[6:03:04] INFO - parser: Status: 130885 Blocks processed. (left: 508741, avg: 13088 blocks/sec)
-...
-[10:28:47] INFO - parser: Status: 639163 Blocks processed. (left:    463, avg:    40 blocks/sec)
-[10:28:57] INFO - parser: Status: 639311 Blocks processed. (left:    315, avg:    40 blocks/sec)
-[10:29:07] INFO - parser: Status: 639452 Blocks processed. (left:    174, avg:    40 blocks/sec)
-[10:29:17] INFO - parser: Status: 639596 Blocks processed. (left:     30, avg:    40 blocks/sec)
-[10:29:19] INFO - parser: Done. Processed 639626 blocks in 266.43 minutes. (avg:    40 blocks/sec)
-[10:32:01] INFO - callback: Done.
-Dumped all 639626 blocks:
-        -> transactions: 549390991
-        -> inputs:       1347165535
-        -> outputs:      1359449320
-[10:32:01] INFO - main: Fin.
-```
 
 
 ## Installing
@@ -108,63 +76,6 @@ It is important to build with `--release`, otherwise you will get a horrible per
 Bitcoin and Bitcoin Testnet transactions are parsed using [rust-bitcoin](https://github.com/rust-bitcoin/rust-bitcoin),
 this includes transactions of type P2SH, P2PKH, P2PK, P2WSH, P2WPKH, P2TR, OP_RETURN and SegWit.
 
-
-## Memory Usage
-The required memory usage depends on the used callback:
-
-* simplestats: ~100MB
-* unspentcsvdump: ~18GB
-* balances: ~18GB
-
-NOTE: Those values are taken from parsing to block height 639631 (17.07.2020).
-
-## Callbacks
-
-Callbacks are built on top of the core parser. They can be implemented to extract specific types of information.
-
-* `balances`: dumps all addresses with a non-zero balance.
-    The csv file is in the following format:
-    ```
-    balances.csv
-    address ; balance
-    ```
-
-* `unspentcsvdump`: dumps all UTXOs along with the address balance.
-    The csv file is in the following format:
-    ```
-    unspent.csv
-    txid ; indexOut ; height ; value ; address
-    ```
-    NOTE: The total size of the csv dump is at least 8 GiB (height 635000).
-
-* `opreturn`: shows transactions with embedded OP_RETURN data that is representable as UTF8.
-
- See [Usage](#Usage) for an example. I chose CSV dumps instead of  an active db-connection because `LOAD DATA INFILE` is the most performant way for bulk inserts.
-    The files are in the following format:
-    ```
-    blocks.csv
-    block_hash ; height ; version ; blocksize ; hashPrev ; hashMerkleRoot ; nTime ; nBits ; nNonce
-    ```
-    ```
-    transactions.csv
-    txid ; hashBlock ; version ; lockTime
-    ```
-    ```
-    tx_in.csv
-    txid ; hashPrevOut ; indexPrevOut ; scriptSig ; sequence
-    ```
-    ```
-    tx_out.csv
-    txid ; indexOut ; height ; value ; scriptPubKey ; address
-    ```
-    If unclear what some of these fields are, see the [block](https://en.bitcoin.it/wiki/Protocol_documentation#block) and [transaction](https://en.bitcoin.it/wiki/Protocol_documentation#tx) specifications.
-
-
-* `simplestats`: prints some blockchain statistics like block count, transaction count, avg transactions per block, largest transaction, transaction types etc.
-
-You can also define custom callbacks. A callback gets called at startup, on each block and at the end. See [src/callbacks/mod.rs](src/callbacks/mod.rs) for more information.
-
-
 ## Contributing
 
 Use the issue tracker to report problems, suggestions and questions. You may also contribute by submitting pull requests.