MXS-1300: Add cluster sync command
The `cluster sync` command synchronizes a MaxScale cluster with one server. This allows new MaxScale instances to be synchronized with an old instance by using the same configuration file and performing a cluster sync.
This commit is contained in:
Markus Mäkelä
parent
fad1b4e3e0
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8fb4532468
@ -29,59 +29,78 @@ function getDifference(a, b) {
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return _.differenceWith(a, b, sameResource)
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}
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// Return a list of objects that differ from each other
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function getChangedObjects(a, b) {
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var ours = _.intersectionWith(a, b, sameResource)
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var theirs = _.intersectionWith(b, a, sameResource)
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return _.differenceWith(ours, theirs, equalResources)
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}
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// Resource collections
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const collections = [
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'servers',
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'monitors',
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'services',
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'users'
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]
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// Individual resources
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const endpoints = [
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'maxscale',
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'maxscale/logs'
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]
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// Calculate a diff between two MaxScale servers
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function getDiffs(a, b) {
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var src = {}
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var dest = {}
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var promises = []
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collections.forEach(function(i) {
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promises.push(doAsyncRequest(b, i, function(res) {
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dest[i] = res
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}))
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promises.push(doAsyncRequest(a, i, function(res) {
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src[i] = res
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}))
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})
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endpoints.forEach(function(i) {
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promises.push(doAsyncRequest(b, i, function(res) {
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dest[i] = res
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}))
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promises.push(doAsyncRequest(a, i, function(res) {
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src[i] = res
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}))
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})
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return Promise.all(promises)
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.then(function() {
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return Promise.resolve([src, dest])
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})
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}
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// Check if the diffs add or delete services
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function haveExtraServices(src, dest) {
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var newObj = getDifference(src.services.data, dest.services.data)
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var oldObj = getDifference(dest.services.data, src.services.data)
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return newObj.length > 0 || oldObj.length > 0
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}
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exports.command = 'cluster <command>'
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exports.desc = 'Cluster objects'
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exports.handler = function() {}
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exports.builder = function(yargs) {
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yargs
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.command('diff <a> <b>', 'Show differences of <a> when compared with <b>. ' +
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'Values must be in HOST:PORT format', {}, function(argv) {
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// Sort of a hack-ish way to force only one iteration of this command
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argv.hosts = [argv.a]
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.command('diff <target>', 'Show difference between host servers and <target>. ' +
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'Value must be in HOST:PORT format', {}, function(argv) {
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maxctrl(argv, function(host) {
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const collections = [
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'servers',
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'monitors',
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'services',
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'users'
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]
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const endpoints = [
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'maxscale',
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'maxscale/logs'
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]
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return getDiffs(host, argv.target)
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.then(function(diffs) {
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var src = diffs[0]
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var dest = diffs[1]
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var src = {}
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var dest = {}
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var promises = []
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collections.forEach(function(i) {
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promises.push(doAsyncRequest(argv.b, i, function(res) {
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dest[i] = res
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}))
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promises.push(doAsyncRequest(argv.a, i, function(res) {
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src[i] = res
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}))
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})
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endpoints.forEach(function(i) {
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promises.push(doAsyncRequest(argv.b, i, function(res) {
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dest[i] = res
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}))
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promises.push(doAsyncRequest(argv.a, i, function(res) {
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src[i] = res
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}))
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})
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return Promise.all(promises)
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.then(function() {
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collections.forEach(function(i) {
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var newObj = getDifference(src[i].data, dest[i].data)
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var oldObj = getDifference(dest[i].data, src[i].data)
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@ -101,9 +120,8 @@ exports.builder = function(yargs) {
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}
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})
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endpoints.forEach(function(i) {
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// Treating the resource endpoints as arrays allows
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// the same functions to be used to compare
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// individual resources and resource collections
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// Treating the resource endpoints as arrays allows the same functions to be used
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// to compare individual resources and resource collections
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var changed = getChangedObjects([src[i].data], [dest[i].data])
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if (changed.length) {
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logger.log("Changed:", i)
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@ -113,6 +131,79 @@ exports.builder = function(yargs) {
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})
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})
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})
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.command('sync <target>', 'Synchronize the cluster with target MaxScale server.', {}, function(argv) {
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maxctrl(argv, function(host) {
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// TODO: Create new listeners
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return getDiffs(argv.target, host)
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.then(function(diffs) {
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var promises = []
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var src = diffs[0]
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var dest = diffs[1]
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if (haveExtraServices(src, dest)) {
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return error('Cannot synchronize host `' + host + '` with target `' +
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argv.target + '`: New or deleted services on target host, ' +
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'both hosts must have the same services.')
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}
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// Delete old servers
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getDifference(dest.servers.data, src.servers.data).forEach(function(i) {
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// First unlink the servers from all services and monitors
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promises.push(
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doAsyncRequest(host, 'servers/' + i.id, null, {method: 'PATCH', body: _.set({}, 'data.relationships', {})})
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.then(function() {
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return doAsyncRequest(host, 'servers/' + i.id, null, {method: 'DELETE'})
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}))
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})
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// Add new servers
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getDifference(src.servers.data, dest.servers.data).forEach(function(i) {
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// Create the servers without relationships, those are generated when services and
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// monitors are updated
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delete i.relationships
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promises.push(doAsyncRequest(host, 'servers', null, {method: 'POST', body: {data: i}}))
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})
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return Promise.all(promises)
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.then(function() {
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var promises = []
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// Delete old monitors
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getDifference(dest.monitors.data, src.monitors.data).forEach(function(i) {
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promises.push(
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doAsyncRequest(host, 'monitors/' + i.id, null, {
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method: 'PATCH', body: _.set({}, 'data.relationships', {})
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})
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.then(function() {
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return doAsyncRequest(host, 'monitors/' + i.id, null, {method: 'DELETE'})
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}))
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})
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return Promise.all(promises)
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})
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.then(function() {
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var promises = []
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// Add new monitors
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getDifference(src.monitors.data, dest.monitors.data).forEach(function(i) {
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promises.push(doAsyncRequest(host, 'servers', null, {method: 'POST', body: {data: i}}))
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})
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return Promise.all(promises)
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})
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.then(function() {
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var promises = []
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// PATCH all remaining resource collections in src from dest apart from the
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// user resource as it requires passwords to be entered
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_.difference(collections, ['users']).forEach(function(i) {
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src[i].data.forEach(function(j) {
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promises.push(doAsyncRequest(host, i + '/' + j.id, null, {method: 'PATCH', body: {data: j}}))
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})
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})
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// Do the same for individual resources
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endpoints.forEach(function(i) {
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promises.push(doAsyncRequest(host, i, null, {method: 'PATCH', body: dest[i]}))
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})
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return Promise.all(promises)
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})
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})
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})
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})
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.usage('Usage: cluster <command>')
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.help()
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.command('*', 'the default command', {}, function(argv) {
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