from charms.reactive import is_state, remove_state, set_state, when, when_any, when_none, when_not
from charmhelpers.core import hookenv
from charms.layer.apache_bigtop_base import Bigtop, get_hadoop_version


@when('hadoop-plugin.joined')
@when_not('namenode.joined')
def blocked(principal):
    hookenv.status_set('blocked', 'missing required namenode relation')


@when('bigtop.available', 'hadoop-plugin.joined', 'namenode.joined')
@when_not('apache-bigtop-plugin.hdfs.installed')
def install_hadoop_client_hdfs(principal, namenode):
    """Install if the namenode has sent its FQDN.

    We only need the namenode FQDN to perform the plugin install, so poll for
    namenodes() data whenever we have a namenode relation. This allows us to
    install asap, even if 'namenode.ready' is not set yet.
    """
    if namenode.namenodes():
        hookenv.status_set('maintenance', 'installing plugin (hdfs)')
        nn_host = namenode.namenodes()[0]
        bigtop = Bigtop()
        hosts = {'namenode': nn_host}
        bigtop.render_site_yaml(hosts=hosts, roles='hadoop-client')
        bigtop.trigger_puppet()
        set_state('apache-bigtop-plugin.hdfs.installed')
        hookenv.status_set('maintenance', 'plugin (hdfs) installed')
    else:
        hookenv.status_set('waiting', 'waiting for namenode fqdn')


@when('apache-bigtop-plugin.hdfs.installed')
@when('hadoop-plugin.joined', 'namenode.joined')
@when_not('namenode.ready')
def send_nn_spec(principal, namenode):
    """Send our plugin spec so the namenode can become ready."""
    bigtop = Bigtop()
    # Send plugin spec (must match NN spec for 'namenode.ready' to be set)
    namenode.set_local_spec(bigtop.spec())


@when('apache-bigtop-plugin.hdfs.installed')
@when('hadoop-plugin.joined', 'namenode.ready')
@when_not('apache-bigtop-plugin.hdfs.ready')
def send_principal_hdfs_info(principal, namenode):
    """Send HDFS data when the namenode becomes ready."""
    principal.set_installed(get_hadoop_version())
    principal.set_hdfs_ready(namenode.namenodes(), namenode.port())
    set_state('apache-bigtop-plugin.hdfs.ready')


@when('apache-bigtop-plugin.hdfs.ready')
@when('hadoop-plugin.joined')
@when_not('namenode.ready')
def clear_hdfs_ready(principal):
    principal.clear_hdfs_ready()
    remove_state('apache-bigtop-plugin.hdfs.ready')
    remove_state('apache-bigtop-plugin.hdfs.installed')


@when('bigtop.available', 'hadoop-plugin.joined', 'namenode.joined', 'resourcemanager.joined')
@when_not('apache-bigtop-plugin.yarn.installed')
def install_hadoop_client_yarn(principal, namenode, resourcemanager):
    if namenode.namenodes() and resourcemanager.resourcemanagers():
        hookenv.status_set('maintenance', 'installing plugin (yarn)')
        nn_host = namenode.namenodes()[0]
        rm_host = resourcemanager.resourcemanagers()[0]
        bigtop = Bigtop()
        hosts = {'namenode': nn_host, 'resourcemanager': rm_host}
        bigtop.render_site_yaml(hosts=hosts, roles='hadoop-client')
        bigtop.trigger_puppet()
        set_state('apache-bigtop-plugin.yarn.installed')
        hookenv.status_set('active', 'ready (HDFS & YARN)')
    else:
        hookenv.status_set('waiting', 'waiting for master fqdns')


@when('apache-bigtop-plugin.yarn.installed')
@when('hadoop-plugin.joined', 'resourcemanager.joined')
@when_not('resourcemanager.ready')
def send_rm_spec(principal, resourcemanager):
    """Send our plugin spec so the resourcemanager can become ready."""
    bigtop = Bigtop()
    resourcemanager.set_local_spec(bigtop.spec())


@when('apache-bigtop-plugin.yarn.installed')
@when('hadoop-plugin.joined', 'resourcemanager.ready')
@when_not('apache-bigtop-plugin.yarn.ready')
def send_principal_yarn_info(principal, resourcemanager):
    """Send YARN data when the resourcemanager becomes ready."""
    version = get_hadoop_version()
    principal.set_installed(version)
    principal.set_yarn_ready(
        resourcemanager.resourcemanagers(), resourcemanager.port(),
        resourcemanager.hs_http(), resourcemanager.hs_ipc())
    set_state('apache-bigtop-plugin.yarn.ready')


@when('apache-bigtop-plugin.yarn.ready')
@when('hadoop-plugin.joined')
@when_not('resourcemanager.ready')
def clear_yarn_ready(principal):
    principal.clear_yarn_ready()
    remove_state('apache-bigtop-plugin.yarn.ready')
    remove_state('apache-bigtop-plugin.yarn.installed')


@when_any('apache-bigtop-plugin.hdfs.installed', 'apache-bigtop-plugin.yarn.installed')
@when('hadoop-plugin.joined')
@when_none('namenode.spec.mismatch', 'resourcemanager.spec.mismatch')
def update_status(principal):
    hdfs_rel = is_state('namenode.joined')
    yarn_rel = is_state('resourcemanager.joined')
    hdfs_ready = is_state('namenode.ready')
    yarn_ready = is_state('resourcemanager.ready')

    if not (hdfs_rel or yarn_rel):
        hookenv.status_set('blocked',
                           'missing namenode and/or resourcemanager relation')
    elif hdfs_rel and not hdfs_ready:
        hookenv.status_set('waiting', 'waiting for hdfs')
    elif yarn_rel and not yarn_ready:
        hookenv.status_set('waiting', 'waiting for yarn')
    else:
        ready = []
        if hdfs_ready:
            ready.append('hdfs')
        if yarn_ready:
            ready.append('yarn')
        hookenv.status_set('active', 'ready ({})'.format(' & '.join(ready)))

from charms.reactive import is_state, remove_state, set_state, when, when_any, when_none, when_not
from charmhelpers.core import hookenv
from charms.layer.apache_bigtop_base import Bigtop, get_hadoop_version


@when('hadoop-plugin.joined')
@when_not('namenode.joined')
def blocked(principal):
    hookenv.status_set('blocked', 'missing required namenode relation')


@when('bigtop.available', 'hadoop-plugin.joined', 'namenode.joined')
@when_not('apache-bigtop-plugin.hdfs.installed')
def install_hadoop_client_hdfs(principal, namenode):
    """Install if the namenode has sent its FQDN.

    We only need the namenode FQDN to perform the plugin install, so poll for
    namenodes() data whenever we have a namenode relation. This allows us to
    install asap, even if 'namenode.ready' is not set yet.
    """
    if namenode.namenodes():
        hookenv.status_set('maintenance', 'installing plugin (hdfs)')
        nn_host = namenode.namenodes()[0]
        bigtop = Bigtop()
        hosts = {'namenode': nn_host}
        bigtop.render_site_yaml(hosts=hosts, roles='hadoop-client')
        bigtop.trigger_puppet()
        set_state('apache-bigtop-plugin.hdfs.installed')
        hookenv.status_set('maintenance', 'plugin (hdfs) installed')
    else:
        hookenv.status_set('waiting', 'waiting for namenode fqdn')


@when('apache-bigtop-plugin.hdfs.installed')
@when('hadoop-plugin.joined', 'namenode.joined')
@when_not('namenode.ready')
def send_nn_spec(principal, namenode):
    """Send our plugin spec so the namenode can become ready."""
    bigtop = Bigtop()
    # Send plugin spec (must match NN spec for 'namenode.ready' to be set)
    namenode.set_local_spec(bigtop.spec())


@when('apache-bigtop-plugin.hdfs.installed')
@when('hadoop-plugin.joined', 'namenode.ready')
@when_not('apache-bigtop-plugin.hdfs.ready')
def send_principal_hdfs_info(principal, namenode):
    """Send HDFS data when the namenode becomes ready."""
    principal.set_installed(get_hadoop_version())
    principal.set_hdfs_ready(namenode.namenodes(), namenode.port())
    set_state('apache-bigtop-plugin.hdfs.ready')


@when('apache-bigtop-plugin.hdfs.ready')
@when('hadoop-plugin.joined')
@when_not('namenode.ready')
def clear_hdfs_ready(principal):
    principal.clear_hdfs_ready()
    remove_state('apache-bigtop-plugin.hdfs.ready')
    remove_state('apache-bigtop-plugin.hdfs.installed')


@when('bigtop.available', 'hadoop-plugin.joined', 'namenode.joined', 'resourcemanager.joined')
@when_not('apache-bigtop-plugin.yarn.installed')
def install_hadoop_client_yarn(principal, namenode, resourcemanager):
    if namenode.namenodes() and resourcemanager.resourcemanagers():
        hookenv.status_set('maintenance', 'installing plugin (yarn)')
        nn_host = namenode.namenodes()[0]
        rm_host = resourcemanager.resourcemanagers()[0]
        bigtop = Bigtop()
        hosts = {'namenode': nn_host, 'resourcemanager': rm_host}
        bigtop.render_site_yaml(hosts=hosts, roles='hadoop-client')
        bigtop.trigger_puppet()
        set_state('apache-bigtop-plugin.yarn.installed')
        hookenv.status_set('active', 'ready (HDFS & YARN)')
    else:
        hookenv.status_set('waiting', 'waiting for master fqdns')


@when('apache-bigtop-plugin.yarn.installed')
@when('hadoop-plugin.joined', 'resourcemanager.joined')
@when_not('resourcemanager.ready')
def send_rm_spec(principal, resourcemanager):
    """Send our plugin spec so the resourcemanager can become ready."""
    bigtop = Bigtop()
    resourcemanager.set_local_spec(bigtop.spec())


@when('apache-bigtop-plugin.yarn.installed')
@when('hadoop-plugin.joined', 'resourcemanager.ready')
@when_not('apache-bigtop-plugin.yarn.ready')
def send_principal_yarn_info(principal, resourcemanager):
    """Send YARN data when the resourcemanager becomes ready."""
    version = get_hadoop_version()
    principal.set_installed(version)
    principal.set_yarn_ready(
        resourcemanager.resourcemanagers(), resourcemanager.port(),
        resourcemanager.hs_http(), resourcemanager.hs_ipc())
    set_state('apache-bigtop-plugin.yarn.ready')


@when('apache-bigtop-plugin.yarn.ready')
@when('hadoop-plugin.joined')
@when_not('resourcemanager.ready')
def clear_yarn_ready(principal):
    principal.clear_yarn_ready()
    remove_state('apache-bigtop-plugin.yarn.ready')
    remove_state('apache-bigtop-plugin.yarn.installed')


@when_any('apache-bigtop-plugin.hdfs.installed', 'apache-bigtop-plugin.yarn.installed')
@when('hadoop-plugin.joined')
@when_none('namenode.spec.mismatch', 'resourcemanager.spec.mismatch')
def update_status(principal):
    hdfs_rel = is_state('namenode.joined')
    yarn_rel = is_state('resourcemanager.joined')
    hdfs_ready = is_state('namenode.ready')
    yarn_ready = is_state('resourcemanager.ready')

    if not (hdfs_rel or yarn_rel):
        hookenv.status_set('blocked',
                           'missing namenode and/or resourcemanager relation')
    elif hdfs_rel and not hdfs_ready:
        hookenv.status_set('waiting', 'waiting for hdfs')
    elif yarn_rel and not yarn_ready:
        hookenv.status_set('waiting', 'waiting for yarn')
    else:
        ready = []
        if hdfs_ready:
            ready.append('hdfs')
        if yarn_ready:
            ready.append('yarn')
        hookenv.status_set('active', 'ready ({})'.format(' & '.join(ready)))

Install if the namenode has sent its FQDN.      We only need the namenode FQDN to perform the plugin install, so poll for     namenodes() data whenever we have a namenode relation. This allows us to     install asap, even if 'namenode.ready' is not set yet. Send our plugin spec so the namenode can become ready. # Send plugin spec (must match NN spec for 'namenode.ready' to be set) Send HDFS data when the namenode becomes ready. Send our plugin spec so the resourcemanager can become ready. Send YARN data when the resourcemanager becomes ready.