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https://github.com/ChristopherA/Learning-Bitcoin-from-the-Command-Line.git
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Update 15_1_Accessing_Bitcoind_with_C.md
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Javier Vargas
GitHub
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@ -2,18 +2,37 @@
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> **NOTE:** This is a draft in progress, so that I can get some feedback from early reviewers. It is not yet ready for learning.
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[needs new intro]
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Interacting with the bitcoind directly and using command-line curl can get simple if you understand how it works, thus in this section we'll show how to use a good package for doing so in C called libbitcoinrpc that provides the functionality to access JSON-RPC bitcoind API. It uses a curl library for accessing the data and it uses the jansson library for encoding and decoding the JSON.
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## Set Up libbitcoinrpc
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To use `libbitcoinrpc`, you need to install a basic C setup and the dependent packages `libcurl`, `libjansson`, and `libuuid`. The following will do so on a Ubuntu system:
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```
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$ sudo apt-get install make gcc libcurl4-openssl-dev libjansson-dev uuid-dev
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Suggested packages:
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libcurl4-doc libidn11-dev libkrb5-dev libldap2-dev librtmp-dev libssh2-1-dev
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The following NEW packages will be installed:
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libcurl4-openssl-dev libjansson-dev uuid-dev
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0 upgraded, 3 newly installed, 0 to remove and 4 not upgraded.
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Need to get 358 kB of archives.
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After this operation, 1.696 kB of additional disk space will be used.
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Do you want to continue? [Y/n] y
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```
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You can then download [libbitcoinrpc from Github](https://github.com/gitmarek/libbitcoinrpc/blob/master/README.md). Clone it or grab a zip file, as you prefer.
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```
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$ sudo apt-get unzip
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$ unzip libbitcoinrpc-master.zip
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unzip libbitcoinrpc-master.zip
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Archive: libbitcoinrpc-master.zip
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a2285e8f221185cd0afdcfaf1bc8c78988fce09a
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creating: libbitcoinrpc-master/
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inflating: libbitcoinrpc-master/.gitignore
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inflating: libbitcoinrpc-master/.travis.yml
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inflating: libbitcoinrpc-master/CREDITS
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inflating: libbitcoinrpc-master/Changelog.md
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inflating: libbitcoinrpc-master/LICENSE
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inflating: libbitcoinrpc-master/Makefile
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inflating: libbitcoinrpc-master/README.md
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$ cd libbitcoinrpc-master/
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```
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@ -36,11 +55,55 @@ INSTALL_HEADERPATH := $(INSTALL_PREFIX)/usr/include
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Then you can compile:
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```
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$ make
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$ ~/libbitcoinrpc-master$ make
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gcc -fPIC -O3 -g -Wall -Werror -Wextra -std=c99 -D VERSION=\"0.2\" -o src/bitcoinrpc_err.o -c src/bitcoinrpc_err.c
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gcc -fPIC -O3 -g -Wall -Werror -Wextra -std=c99 -D VERSION=\"0.2\" -o src/bitcoinrpc_global.o -c src/bitcoinrpc_global.c
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gcc -fPIC -O3 -g -Wall -Werror -Wextra -std=c99 -D VERSION=\"0.2\" -o src/bitcoinrpc.o -c src/bitcoinrpc.c
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gcc -fPIC -O3 -g -Wall -Werror -Wextra -std=c99 -D VERSION=\"0.2\" -o src/bitcoinrpc_resp.o -c src/bitcoinrpc_resp.c
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gcc -fPIC -O3 -g -Wall -Werror -Wextra -std=c99 -D VERSION=\"0.2\" -o src/bitcoinrpc_cl.o -c src/bitcoinrpc_cl.c
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gcc -fPIC -O3 -g -Wall -Werror -Wextra -std=c99 -D VERSION=\"0.2\" -o src/bitcoinrpc_method.o -c src/bitcoinrpc_method.c
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gcc -fPIC -O3 -g -Wall -Werror -Wextra -std=c99 -D VERSION=\"0.2\" -shared -Wl,-soname,libbitcoinrpc.so.0 \
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src/bitcoinrpc_err.o src/bitcoinrpc_global.o src/bitcoinrpc.o src/bitcoinrpc_resp.o src/bitcoinrpc_cl.o src/bitcoinrpc_method.o \
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-o .lib/libbitcoinrpc.so.0.2 \
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-Wl,--copy-dt-needed-entries -luuid -ljansson -lcurl
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ldconfig -v -n .lib
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.lib:
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libbitcoinrpc.so.0 -> libbitcoinrpc.so.0.2 (changed)
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ln -fs libbitcoinrpc.so.0 .lib/libbitcoinrpc.so
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~/libbitcoinrpc-master$ sudo make install
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Installing to
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install .lib/libbitcoinrpc.so.0.2 /usr/local/lib
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ldconfig -n /usr/local/lib
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ln -fs libbitcoinrpc.so.0 /usr/local/lib/libbitcoinrpc.so
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install -m 644 src/bitcoinrpc.h /usr/local/include
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Installing docs to /usr/share/doc/bitcoinrpc
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mkdir -p /usr/share/doc/bitcoinrpc
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install -m 644 doc/*.md /usr/share/doc/bitcoinrpc
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install -m 644 CREDITS /usr/share/doc/bitcoinrpc
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install -m 644 LICENSE /usr/share/doc/bitcoinrpc
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install -m 644 Changelog.md /usr/share/doc/bitcoinrpc
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Installing man pages
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install -m 644 doc/man3/bitcoinrpc*.gz /usr/local/man/man3
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~/libbitcoinrpc-master$
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```
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If that works, you can install the package:
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```
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$ sudo make install
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Installing to
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install .lib/libbitcoinrpc.so.0.2 /usr/local/lib
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ldconfig -n /usr/local/lib
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ln -fs libbitcoinrpc.so.0 /usr/local/lib/libbitcoinrpc.so
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install -m 644 src/bitcoinrpc.h /usr/local/include
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Installing docs to /usr/share/doc/bitcoinrpc
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mkdir -p /usr/share/doc/bitcoinrpc
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install -m 644 doc/*.md /usr/share/doc/bitcoinrpc
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install -m 644 CREDITS /usr/share/doc/bitcoinrpc
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install -m 644 LICENSE /usr/share/doc/bitcoinrpc
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install -m 644 Changelog.md /usr/share/doc/bitcoinrpc
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Installing man pages
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install -m 644 doc/man3/bitcoinrpc*.gz /usr/local/man/man3
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```
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## Write Code in C
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@ -212,7 +275,7 @@ Successfully connected to server!
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```
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## Appendix II: Getting Mining Info
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Here's the complete code for the `getmininginfo` command, with organized variable initiatialization, error checking, and variable cleanup.
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Here's the complete code for the `getmininginfo` command, with organized variable initiatialization, error checking, and variable cleanup. For this example we use a regtest network and show it's output.
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```
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file: getmininginfo.c
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@ -233,7 +296,7 @@ int main(void) {
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bitcoinrpc_global_init();
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rpc_client = bitcoinrpc_cl_init_params ("bitcoinrpc", "73bd45ba60ab8f9ff9846b6404769487", "127.0.0.1", 18332);
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rpc_client = bitcoinrpc_cl_init_params ("bitcoinrpc", "73bd45ba60ab8f9ff9846b6404769487", "127.0.0.1", 18443);
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if (rpc_client) {
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getmininginfo = bitcoinrpc_method_init(BITCOINRPC_METHOD_GETMININGINFO);
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@ -295,32 +358,26 @@ As usual, you can compile and run as follows:
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$ cc getmininginfo.c -lbitcoinrpc -ljansson -o getmininginfo
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$ ./getmininginfo
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Full Response: {
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"id": "03406237-cd8f-466d-ac31-86711ea9d1db",
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"result": {
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"blocks": 1147154,
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"errors": "Warning: unknown new rules activated (versionbit 28)",
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"pooledtx": 0,
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"currentblocksize": 0,
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"currentblockweight": 0,
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"currentblocktx": 0,
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"difficulty": 313525.08513550513,
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"networkhashps": 3958339463617.417,
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"chain": "test"
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"blocks": 1100,
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"difficulty": 4.6565423739069252e-10,
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"networkhashps": 0.01006838108822419,
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"pooledtx": 1,
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"chain": "regtest",
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"warnings": ""
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},
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"error": null
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"error": null,
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"id": "d07a55cc-000a-469e-ad7f-c8cef46644da"
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}
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Just the Result: {
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"blocks": 1147154,
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"errors": "Warning: unknown new rules activated (versionbit 28)",
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"pooledtx": 0,
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"currentblocksize": 0,
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"currentblockweight": 0,
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"currentblocktx": 0,
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"difficulty": 313525.08513550513,
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"networkhashps": 3958339463617.417,
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"chain": "test"
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"blocks": 1100,
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"difficulty": 4.6565423739069252e-10,
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"networkhashps": 0.01006838108822419,
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"pooledtx": 1,
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"chain": "regtest",
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"warnings": ""
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}
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Block Count: 1147154
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Block Count: 1100
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```
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