EOSIO API Healthcheck for HAProxy

This program implements EOSIO healthcheck for HAProxy over TCP.

Compiling

You will need go-lang version 1.14 or later to compile the source.

First you need to install golang dependacies:

$ make deps

Then you can compile with compile.sh script

$ ./compile.sh

Execute ./compile.sh --help to see all available flags to crosscompile for different systems/architectures.

Package

run ./package.sh to generate package. Debian (.deb) and FreeBSD are supported.

TCP Protocol

The protocol is simple and has 4 rules.

1. Data is transmitted in packets encoded in ascii and ends with newline \n.
2. There are two types of packages: Request and Response. Each Request has exactly one Response.
3. Each parameter inside a Request is separated by |
4. Each response contains exactly one status code (see below)

Request

The following parameters are supported in a request and are ordered from first to last below:

#	Name	Required	Description
1	url	Yes (port default 80)	http url to the api. http(s)://<ip-or-domain>(:<port>)
2	num_blocks	No (default 10)	Number of blocks the api can drift before reported down
3	version	No (default v1)	API Version to check against, v1 = standard, v2 = Hyperion
4	host	No (default from url)	Value to send in the HTTP Host Header to the API

Response

The api can respond with exactly one status code. See HAproxy documentation for more information

code	Description
up	Api is healthy
down	Api is not healthy
failed	The program failed to read the status from the api.
maint	Api is set in maintenance mode (not used)
ready	Api is ready again after being in maint state (not used)
stopped	Api has been stopped manually (not used)

Author

Henrik Hautakoski - henrik@eossweden.org