Use ExternalProject for NIH dependencies

Fixes: RIPD-1648

 - use ExternalProject for snappy, lz4, SOCI, and sqlite3
 - use FetchContent for NuDB
 - update SOCI from 79e222e3c2278e6108137a2d26d3689418b37544 to
   3a1f602b3021b925d38828e3ff95f9e7f8887ff7
 - update lz4 from c10863b98e1503af90616ae99725ecd120265dfb to v1.8.2
 - update sqlite3 from 3.21 to 3.24
 - update snappy from b02bfa754ebf27921d8da3bd2517eab445b84ff9 to 1.1.7
 - update NuDB from 00adc6a4f16679a376f40c967f77dfa544c179c1 to 1.0.0

src/README.md

@@ -16,15 +16,23 @@ Source folders:
 
 | Folder          | Upstream Repo                                | Description |
 |:----------------|:---------------------------------------------|:------------|
-| `beast`         | https://github.com/boostorg/beast            | Cross-platform library for WebSocket and HTTP built on [Boost.Asio](https://think-async.com/Asio) |
+| `beast`         | N/A                                          | legacy utility code that was formerly associated with boost::beast
 | `ed25519-donna` | https://github.com/floodyberry/ed25519-donna | [Ed25519](http://ed25519.cr.yp.to/) digital signatures |
-| `lz4`           | https://github.com/lz4/lz4                   | LZ4 lossless compression algorithm |
-| `nudb`          | https://github.com/vinniefalco/NuDB          | Constant-time insert-only key/value database for SSD drives (Less memory usage than RocksDB.) |
 | `protobuf`      | https://github.com/google/protobuf           | Protocol buffer data interchange format. Ripple has changed some names in order to support the unity-style of build (a single .cpp added to the project, instead of linking to a separately built static library). |
 | `ripple`        | N/A                                          | **Core source code for `rippled`** |
 | `rocksdb2`      | https://github.com/facebook/rocksdb          | Fast key/value database. (Supports rotational disks better than NuDB.) |
 | `secp256k1`     | https://github.com/bitcoin-core/secp256k1    | ECDSA digital signatures using the **secp256k1** curve |
-| `snappy`        | https://github.com/google/snappy             | "Snappy" lossless compression algorithm. (Technically, the source is in `snappy/snappy`, while `snappy/` also has config options that aren't part of the upstream repository.) |
-| `soci`          | https://github.com/SOCI/soci                 | Abstraction layer for database access. |
-| `sqlite`        | https://www.sqlite.org/src                   | An embedded database engine that writes to simple files. (Technically not a subtree, just a direct copy of the [SQLite source distribution](http://sqlite.org/download.html).) |
 | `test`          | N/A                                          | **Unit tests for `rippled`** |
+
+The following dependencies are downloaded and built using ExternalProject
+(or FetchContent, where possible). Refer to CMakeLists.txt file for
+details about how these sources are built :
+
+| Name            | Upstream Repo                                | Description |
+|:----------------|:---------------------------------------------|:------------|
+| `lz4`           | https://github.com/lz4/lz4                   | LZ4 lossless compression algorithm |
+| `nudb`          | https://github.com/vinniefalco/NuDB          | Constant-time insert-only key/value database for SSD drives (Less memory usage than RocksDB.) |
+| `snappy`        | https://github.com/google/snappy             | "Snappy" lossless compression algorithm. |
+| `soci`          | https://github.com/SOCI/soci                 | Abstraction layer for database access. |
+| `sqlite`        | https://www.sqlite.org/src                   | An embedded database engine that writes to simple files. |
+

src/ripple/core/impl/DummySociDynamicBackend.cpp

@@ -1,66 +0,0 @@
-//------------------------------------------------------------------------------
-/*
-    This file is part of rippled: https://github.com/ripple/rippled
-    Copyright (c) 2012-2015 Ripple Labs Inc.
-
-    Permission to use, copy, modify, and/or distribute this software for any
-    purpose  with  or without fee is hereby granted, provided that the above
-    copyright notice and this permission notice appear in all copies.
-
-    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
-    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
-    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-*/
-//==============================================================================
-
-/*  Stub functions for soci dynamic backends.
-
-    Ripple does not use dynamic backends, and inclduing soci's
-    dynamic backends compilcates the build (it requires a generated
-    header file and some macros to be defined.)
-*/
-
-#if defined(__clang__)
-#pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Wdeprecated"
-#endif
-
-#include <ripple/basics/contract.h>
-#include <ripple/core/SociDB.h>
-#include <soci/sqlite3/soci-sqlite3.h>
-
-// dummy soci-backend
-namespace soci {
-namespace dynamic_backends {
-// used internally by session
-backend_factory const& get (std::string const& name)
-{
-    ripple::Throw<std::runtime_error> ("Not Supported");
-    return std::ref(soci::sqlite3); // Silence compiler warning.
-};
-
-// provided for advanced user-level management
-std::vector<std::string>& search_paths ()
-{
-    static std::vector<std::string> empty;
-    return empty;
-};
-void register_backend (std::string const&, std::string const&){};
-void register_backend (std::string const&, backend_factory const&){};
-std::vector<std::string> list_all ()
-{
-    return {};
-};
-void unload (std::string const&){};
-void unload_all (){};
-
-}  // namespace dynamic_backends
-}  // namespace soci
-
-#if defined(__clang__)
-#pragma clang diagnostic pop
-#endif

src/ripple/nodestore/impl/codec.h

@@ -28,7 +28,7 @@
 #include <ripple/nodestore/impl/varint.h>
 #include <ripple/nodestore/NodeObject.h>
 #include <ripple/protocol/HashPrefix.h>
-#include <lz4/lib/lz4.h>
+#include <lz4.h>
 #include <cstddef>
 #include <cstring>
 #include <string>

src/ripple/unity/soci_ripple.cpp

@@ -18,5 +18,4 @@
 //==============================================================================
 
 
-#include <ripple/core/impl/DummySociDynamicBackend.cpp>
 #include <ripple/core/impl/SociDB.cpp>