feat(api): adding api server code

templater can be used as a commmand line tool or as an api server.

data/config/test.json

@@ -0,0 +1,26 @@
+{
+  "Name": "loki",
+  "ConfigFiles": [
+    {
+      "destination": "/etc/loki/loki-local-config.yaml",
+      "source": "loki-local-config.pktpl.hcl",
+      "mod": "600"
+    }
+  ],
+  "AuthEnabled": false,
+  "User": "loki",
+  "Group": "grafana",
+  "HTTPPort": "3100",
+  "GRPCPort": "9096",
+  "AlertManagerURL": "http://localhost:9093",
+  "StorageRoot": "/var/loki",
+  "SharedStore": "filesystem",
+  "ObjectStore": "filesystem",
+  "LogLevel": "error",
+  "S3": {
+      "URL": "",
+      "BucketName": "",
+      "APIKey": "",
+      "APISecretKey": ""
+  }
+}

data/templates/loki-local-config.pktpl.hcl

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+%{ if AuthEnabled ~}
+auth_enabled: true
+%{ else }
+auth_enabled: false
+%{ endif }
+
+server:
+  http_listen_port: ${HTTPPort}
+  grpc_listen_port: ${GRPCPort}
+  log_level: ${LogLevel}
+
+ingester:
+  wal:
+    enabled: true
+    dir: ${StorageRoot}/wal
+    flush_on_shutdown: true
+  lifecycler:
+    address: 127.0.0.1
+    ring:
+      kvstore:
+        store: inmemory
+      replication_factor: 1
+    final_sleep: 0s
+  chunk_idle_period: 1h       # Any chunk not receiving new logs in this time will be flushed
+  max_chunk_age: 1h           # All chunks will be flushed when they hit this age, default is 1h
+  chunk_target_size: 1048576  # Loki will attempt to build chunks up to 1.5MB, flushing first if chunk_idle_period or max_chunk_age is reached first
+  chunk_retain_period: 30s    # Must be greater than index read cache TTL if using an index cache (Default index read cache TTL is 5m)
+  max_transfer_retries: 0     # Chunk transfers disabled
+
+schema_config:
+  configs:
+  - from: 2020-05-15
+    store: boltdb-shipper
+    object_store: ${ObjectStore}
+    schema: v11
+    index:
+      prefix: index_
+      period: 24h
+
+storage_config:
+ boltdb_shipper:
+   active_index_directory: ${StorageRoot}/index
+   shared_store: ${SharedStore}
+   cache_location: ${StorageRoot}/cache
+   cache_ttl: 168h
+
+%{ if ObjectStore == "filesystem" ~}
+  filesystem:
+    directory: ${StorageRoot}/chunks
+%{ else }
+  aws:
+    s3: s3://${S3.APIKey}:${S3.APISecretKey}@${S3.URL}/${S3.BucketName}
+    s3forcepathstyle: true
+%{ endif }
+
+compactor:
+  shared_store: ${SharedStore}
+  working_directory: ${StorageRoot}/compactor
+  compaction_interval: 10m
+
+limits_config:
+  reject_old_samples: true
+  reject_old_samples_max_age: 168h
+
+chunk_store_config:
+  max_look_back_period: 0s
+
+table_manager:
+  retention_deletes_enabled: false
+  retention_period: 0s
+
+ruler:
+  storage:
+    type: local
+    local:
+      directory: ${StorageRoot}/rules
+  rule_path: ${StorageRoot}/rules
+  alertmanager_url: ${AlertManagerURL}
+  ring:
+    kvstore:
+      store: inmemory
+  enable_api: true

data/templates/loki-local-config.tpl

@@ -0,0 +1,82 @@
+{{ if .AuthEnabled  }}
+auth_enabled: true
+{{ else  }}
+auth_enabled: false
+{{ end  }}
+
+server:
+  http_listen_port: {{ .HTTPPort }}
+  grpc_listen_port: {{ .GRPCPort }}
+  log_level: {{ .LogLevel }}
+
+ingester:
+  wal:
+    enabled: true
+    dir: {{ .StorageRoot }}/wal
+    flush_on_shutdown: true
+  lifecycler:
+    address: 127.0.0.1
+    ring:
+      kvstore:
+        store: inmemory
+      replication_factor: 1
+    final_sleep: 0s
+  chunk_idle_period: 1h       # Any chunk not receiving new logs in this time will be flushed
+  max_chunk_age: 1h           # All chunks will be flushed when they hit this age, default is 1h
+  chunk_target_size: 1048576  # Loki will attempt to build chunks up to 1.5MB, flushing first if chunk_idle_period or max_chunk_age is reached first
+  chunk_retain_period: 30s    # Must be greater than index read cache TTL if using an index cache (Default index read cache TTL is 5m)
+  max_transfer_retries: 0     # Chunk transfers disabled
+
+schema_config:
+  configs:
+  - from: 2020-05-15
+    store: boltdb-shipper
+    object_store: {{ .ObjectStore }}
+    schema: v11
+    index:
+      prefix: index_
+      period: 24h
+
+storage_config:
+ boltdb_shipper:
+   active_index_directory: {{ .StorageRoot }}/index
+   shared_store: {{ .SharedStore }}
+   cache_location: {{ .StorageRoot }}/cache
+   cache_ttl: 168h
+
+{{ if eq (.ObjectStore) ("filesystem") }}
+  filesystem:
+    directory: {{ .StorageRoot }}/chunks
+{{ else  }}
+  aws:
+    s3: s3://{{ .S3.APIKey }}:{{ .S3.APISecretKey}}@{{ .S3.URL}}/{{ .S3.BucketName}}
+    s3forcepathstyle: true
+{{ end  }}
+
+compactor:
+  shared_store: {{ .SharedStore }}
+  working_directory: {{ .StorageRoot }}/compactor
+  compaction_interval: 10m
+
+limits_config:
+  reject_old_samples: true
+  reject_old_samples_max_age: 168h
+
+chunk_store_config:
+  max_look_back_period: 0s
+
+table_manager:
+  retention_deletes_enabled: false
+  retention_period: 0s
+
+ruler:
+  storage:
+    type: local
+    local:
+      directory: {{ .StorageRoot }}/rules
+  rule_path: {{ .StorageRoot }}/rules
+  alertmanager_url: {{ .AlertManagerURL }}
+  ring:
+    kvstore:
+      store: inmemory
+  enable_api: true