Clever/discovery-go

Name: discovery-go

Owner: Clever

Description: Programmatically find services

Created: 2015-08-03 21:51:29.0

Updated: 2018-05-24 02:38:20.0

Pushed: 2018-05-24 02:38:19.0

Homepage: null

Size: 33

Language: Go

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README

discovery-go

This library programmatically finds endpoints for dependencies. Similar to discovery-node and disocvery-python.

See Service Discovery for more details.

API

Godoc Documentation

Examples

manAdminURLString, err := discovery.URL("gearman-admin", "http")
rr != nil {
log.Fatal("ERROR: " + err.Error())


edHostPort, err := discovery.HostPort("stoked", "thrift")
rr != nil {
logger.Fatal("ERROR: " + err.Error())


edHost, err := discovery.Host("stoked", "thrift")
rr != nil {
logger.Fatal("ERROR: " + err.Error())


edPort, err := discovery.Port("stoked", "thrift")
rr != nil {
logger.Fatal("ERROR: " + err.Error())

Implementation Details

Currently, discovery-{go,node,python} looks for environment variables with the following format:

ICE_{SERVICE_NAME}_{EXPOSE_NAME}_{PROTO,HOST,PORT}

These environment variables are autogenerated by fab and catapult during app deployment. Three env-vars are created for each app listed in the dependencies section of caller's launch yaml.

For example, if an app lists district-authorizations as a dependency, fab and catapult will generate this env-vars triplet:

ICE_DISTRICT_AUTHORIZATIONS_HTTP_PROTO = "http"
ICE_DISTRICT_AUTHORIZATIONS_HTTP_HOST = "district-authorizations.ops.clever.com"
ICE_DISTRICT_AUTHORIZATIONS_HTTP_PORT = "80"