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NEWS

Unreleased

  • GRAPH_MAX_GAS_PER_HANDLER is set to a very high value by default, effectively disabling handler gas limits until the costs are better benchmarked and refined.
  • Pipeline store writes #3084 #3177

0.26.0

Features

  • Gas metering #2414
  • Adds support for Solidity Custom Errors #2577
  • Debug fork tool #2995 #3292
  • Automatically remove unused deployments #3023
  • Fix fulltextsearch space handling #3048
  • Allow placing new deployments onto one of several shards #3049
  • Make NEAR subgraphs update their sync status #3108
  • GraphQL validations #3164
  • Add special treatment for immutable entities #3201
  • Tendermint integration #3212
  • Skip block updates when triggers are empty #3223 #3268
  • Use new GraphiQL version #3252
  • GraphQL prefetching #3256
  • Allow using Bytes as well as String/ID for the id of entities #3271
  • GraphQL route for dumping entity changes in subgraph and block #3275
  • Firehose filters #3323
  • NEAR filters #3372

Robustness

  • Improve our CacheWeight estimates #2935
  • Refactor GraphQL execution #3005
  • Setup databases in parallel #3019
  • Block ingestor now fetches receipts in parallel #3030
  • Prevent subscriptions from back-pressuring the notification queue #3053
  • Avoid parsing X triggers if the filter is empty #3083
  • Pipeline BlockStream #3085
  • More robust proofOfIndexing GraphQL route #3348

graphman

  • Add run command, for running a subgraph up to a block #3079
  • Add analyze command, for analyzing a PostgreSQL table, which can improve performance #3170
  • Add index create command, for adding an index to certain attributes #3175
  • Add index list command, for listing indexes #3198
  • Add index drop command, for dropping indexes #3198

Dependency Updates

These are the main ones:

  • Updated protobuf to latest version for NEAR #2947
  • Update web3 crate #2916 #3120 #3338
  • Update graphql-parser to v0.4.0 #3020
  • Bump itertools from 0.10.1 to 0.10.3 #3037
  • Bump clap from 2.33.3 to 2.34.0 #3039
  • Bump serde_yaml from 0.8.21 to 0.8.23 #3065
  • Bump tokio from 1.14.0 to 1.15.0 #3092
  • Bump indexmap from 1.7.0 to 1.8.0 #3143
  • Update ethabi to its latest version #3144
  • Bump structopt from 0.3.25 to 0.3.26 #3180
  • Bump anyhow from 1.0.45 to 1.0.53 #3182
  • Bump quote from 1.0.9 to 1.0.16 #3112 #3183 #3384
  • Bump tokio from 1.15.0 to 1.16.1 #3208
  • Bump semver from 1.0.4 to 1.0.5 #3229
  • Bump async-stream from 0.3.2 to 0.3.3 #3361
  • Update jsonrpc-server #3313

Misc

  • More context when logging RPC calls #3128
  • Increase default reorg threshold to 250 for Ethereum #3308
  • Improve traces error logs #3353
  • Add warning and continue on parse input failures for Ethereum #3326

Upgrade Notes

When upgrading to this version, we recommend taking a brief look into these changes:

  • Gas metering #2414
    • Now there's a gas limit for subgraph mappings, if the limit is reached the subgraph will fail with a non-deterministic error, you can make them recover via the environment variable GRAPH_MAX_GAS_PER_HANDLER
  • Improve our CacheWeight estimates #2935
    • This is relevant because a couple of releases back we've added a limit for the memory size of a query result. That limit is based of the CacheWeight.

These are some of the features that will probably be helpful for indexers 😊

  • Allow placing new deployments onto one of several shards #3049
  • GraphQL route for dumping entity changes in subgraph and block #3275
  • Unused deployments are automatically removed now #3023
    • The interval can be set via GRAPH_REMOVE_UNUSED_INTERVAL
  • Setup databases in parallel #3019
  • Block ingestor now fetches receipts in parallel #3030
    • GRAPH_ETHEREUM_FETCH_TXN_RECEIPTS_IN_BATCHES can be set to true for the old fetching behavior
  • More robust proofOfIndexing GraphQL route #3348
    • A token can be set via GRAPH_POI_ACCESS_TOKEN to limit access to the POI route
  • The new graphman commands 🙂

Api Version 0.0.7 and Spec Version 0.0.5

This release brings API Version 0.0.7 in mappings, which allows Ethereum event handlers to require transaction receipts to be present in the Event object. Refer to PR #3373 for instructions on how to enable that.

0.25.2

This release includes two changes:

  • Bug fix of blocks being skipped from processing when: a deterministic error happens and the index-node gets restarted. Issue #3236, Pull Request: #3316.
  • Automatic retries for non-deterministic errors. Issue #2945, Pull Request: #2988.

This is the last patch on the 0.25 minor version, soon 0.26.0 will be released. While that we recommend updating to this version to avoid determinism issues that could be caused on graph-node restarts.

0.25.1

This release only adds two fixes:

  • The first is to address an issue with decoding the input of some calls #3194 where subgraphs that would try to index contracts related to those would fail. Now they can advance normally.
  • The second one is to fix a non-determinism issue with the retry mechanism for errors. Whenever a non-deterministic error happened, we would keep retrying to process the block, however we should've clear the EntityCache on each run so that the error entity changes don't get transacted/saved in the database in the next run. This could make the POI generation non-deterministic for subgraphs that failed and retried for non-deterministic reasons, adding a new entry to the database for the POI.

We strongly recommend updating to this version as quickly as possible.

0.25.0

Api Version 0.0.6

This release ships support for API version 0.0.6 in mappings:

  • Added nonce field for Transaction objects.
  • Added baseFeePerGas field for Block objects (EIP-1559).

Block Cache Invalidation and Reset

All cached block data must be refetched to account for the new Block and Trasaction struct versions, so this release includes a graph-node startup check that will:

  1. Truncate all block cache tables.
  2. Bump the db_version value from 2 to 3.

(Table truncation is a fast operation and no downtime will occur because of that.)

Ethereum

  • 'Out of gas' errors on contract calls are now considered deterministic errors, so they can be handled by try_ calls. The gas limit is 50 million.

Environment Variables

  • The GRAPH_ETH_CALL_GAS environment is removed to prevent misuse, its value is now hardcoded to 50 million.

Multiblockchain

  • Initial support for NEAR subgraphs.
  • Added FirehoseBlockStream implementation of BlockStream (#2716)

Misc

  • Rust docker image is now based on Debian Buster.
  • Optimizations to the PostgreSQL notification queue.
  • Improve PostgreSQL robustness in multi-sharded setups. (#2815)
  • Added 'networks' to the 'subgraphFeatures' endpoint. (#2826)
  • Check and limit the size of GraphQL query results. (#2845)
  • Allow _in and _not_in GraphQL filters. (#2841)
  • Add PoI for failed subgraphs. (#2748)
  • Make graphman rewind safer to use. (#2879)
  • Add subgraphErrors for all GraphQL schemas. (#2894)
  • Add Graph-Attestable response header. (#2946)
  • Add support for minimum block constraint in GraphQL queries (number_gte) (#2868).
  • Handle revert cases from Hardhat and Ganache (#2984)
  • Fix bug on experimental prefetching optimization feature (#2899)

0.24.2

This release only adds a fix for an issue where certain GraphQL queries could lead to graph-node running out of memory even on very large systems. This release adds code that checks the size of GraphQL responses as they are assembled, and can warn about large responses in the logs resp. abort query execution based on the values of the two new environment variables GRAPH_GRAPHQL_WARN_RESULT_SIZE and GRAPH_GRAPHQL_ERROR_RESULT_SIZE. It also adds Prometheus metrics query_result_size and query_result_max to track the memory consumption of successful GraphQL queries. The unit for the two environment variables is bytes, based on an estimate of the memory used by the result; it is best to set them after observing the Prometheus metrics for a while to establish what constitutes a reasonable limit for them.

We strongly recommend updating to this version as quickly as possible.

0.24.1

Feature Management

This release supports the upcoming Spec Version 0.0.4 that enables subgraph features to be declared in the manifest and validated during subgraph deployment #2682 #2746.

Subgraphs using previous versions are still supported and won't be affected by this change.

New Indexer GraphQL query: subgraphFetaures

It is now possible to query for the features a subgraph uses given its Qm-hash ID.

For instance, the following query...

{
  subgraphFeatures(subgraphId: "QmW9ajg2oTyPfdWKyUkxc7cTJejwdyCbRrSivfryTfFe5D") {
    features
    errors
  }
}

... would produce this result:

{
  "data": {
    "subgraphFeatures": {
      "errors": [],
      "features": [
        "nonFatalErrors",
        "ipfsOnEthereumContracts"
      ]
    }
  }
}

Subraphs with any Spec Version can be queried that way.

Api Version 0.0.5

  • Added better error message for null pointers in the runtime #2780.

Environment Variables

  • When GETH_ETH_CALL_ERRORS_ENV is unset, it doesn't make eth_call errors to be considered determinsistic anymore #2784

Robustness

  • Tolerate a non-primary shard being down during startup #2727.
  • Check that at least one replica for each shard has a non-zero weight #2749.
  • Reduce locking for the chain head listener #2763.

Logs

  • Improve block ingestor error reporting for missing receipts #2743.

0.24.0

Api Version 0.0.5

This release ships support for API version 0.0.5 in mappings. hIt contains a fix for call handlers and the long awaited AssemblyScript version upgrade!

  • AssemblyScript upgrade: The mapping runtime is updated to support up-to-date versions of the AssemblyScript compiler. The graph-cli/-ts releases to support this are in alpha, soon they will be released along with a migration guide for subgraphs.
  • Call handlers fix: Call handlers will never be triggered on transactions with a failed status, resolving issue #2409. Done in #2511.

Logs

  • The log "Skipping handler because the event parameters do not match the event signature." was downgraded from info to trace level.
  • Some block ingestor error logs were upgrded from debug to info level #2666.

Metrics

  • query_semaphore_wait_ms is now by shard, and has the pool and shard labels.
  • deployment_failed metric added, it is 1 if the subgraph has failed and 0 otherwise.

Other

  • Upgrade to tokio 1.0 and futures 0.3 #2679, the first major contribution by StreamingFast!
  • Support Celo block reward events #2670.
  • Reduce the maximum WASM stack size and make it configurable #2719.
  • For robustness, ensure periodic updates to the chain head listener #2725.

0.23.1

  • Fix ipfs timeout detection #2584.
  • Fix discrepancy between a database table and its Diesel model #2586.

0.23.0

The Graph Node internals are being heavily refactored to prepare it for the multichain future. In the meantime, here are the changes for this release:

  • The GRAPH_ETH_CALL_BY_NUMBER environment variable has been removed. Graph Node requires an Ethereum client that supports EIP-1898, which all major clients support.
  • Added support for IPFS versions larger than 0.4. Several changes to make graph-node more tolerant of slow/flaky IPFS nodes.
  • Added Ethereum ABI encoding and decoding functionality #2348.
  • Experimental support for configuration files, see the documentation here.
  • Better PoI performance #2329.
  • Improve grafting performance and robustness by copying in batches #2293.
  • Subgraph metadata storage has been simplified and reorganized. External tools (e.g., Grafana dashboards) that access the database directly will need to be updated.
  • Ordering in GraphQL queries is now truly reversible #2214
  • The GRAPH_SQL_STATEMENT_TIMEOUT environment variable can be used to enforce a timeout for individual SQL queries that are run in the course of processing a GraphQL query #2285
  • Using ethereum.call in mappings in globals is deprecated

Graphman

Graphman is a CLI tool to manage your subgraphs. It is now included in the Docker container #2289. And new commands have been added:

  • graphman copy can copy subgraphs across DB shards #2313.
  • graphman rewind to rewind a deployment to a given block #2373.
  • graphman query to log info about a GraphQL query #2206.
  • graphman create to create a subgraph name #2419.

Metrics

  • The deployment_blocks_behind metric has been removed, and a deployment_head metric has been added. To see how far a deployment is behind, use the difference between ethereum_chain_head_number and deployment_head.
  • The trigger_type label was removed from the metric deployment_trigger_processing_duration.

0.22.0

Feature: Block store sharding

This release makes it possible to shard the block and call cache for chain data across multiple independent Postgres databases. This feature is considered experimental. We encourage users to try this out in a test environment, but do not recommend it yet for production use. In particular, the details of how sharding is configured may change in backwards-incompatible ways in the future.

Feature: Non-fatal errors update

Non-fatal errors (see release 0.20 for details) is documented and can now be enabled on graph-cli. Various related bug fixes have been made #2121 #2136 #2149 #2160.

Improvements

  • Add bitwise operations and string constructor to BigInt #2151.
  • docker: Allow custom ethereum poll interval #2139.
  • Deterministic error work in preparation for gas #2112

Bug fixes

  • Fix not contains filter #2146.
  • Resolve __typename in _meta field #2118
  • Add CORS for all HTTP responses #2196

0.21.1

  • Fix subgraphs failing with a fatalError when deployed while already running (#2104).
  • Fix missing scalar Int declaration in index node GraphQL API, causing indexer-service queries to fail (#2104).

0.21.0

Feature: Database sharding

This release makes it possible to shard subgraph storage and spread subgraph deployments, and the load coming from indexing and querying them across multiple independent Postgres databases.

This feature is considered experimenatal. We encourage users to try this out in a test environment, but do not recommend it yet for production use In particular, the details of how sharding is configured may change in backwards-incompatible ways in the future.

Breaking change: Require a block number in proofOfIndexing queries

This changes the proofOfIndexing GraphQL API from

type Query {
  proofOfIndexing(subgraph: String!, blockHash: Bytes!, indexer: Bytes): Bytes
}

to

type Query {
  proofOfIndexing(
    subgraph: String!
    blockNumber: Int!
    blockHash: Bytes!
    indexer: Bytes
  ): Bytes
}

This allows the indexer agent to provide a block number and hash to be able to obtain a POI even if this block is not cached in the Ethereum blocks cache. Prior to this, the POI would be null if this wasn't the case, even if the subgraph deployment in question was up to date, leading to the indexer missing out on indexing rewards.

Misc

  • Fix non-determinism caused by not (always) correctly reverting dynamic sources when handling reorgs.
  • Integrate the query cache into subscriptions to improve their performance.
  • Add graphman crate for managing Graph Node infrastructure.
  • Improve query cache logging.
  • Expose indexing status port (8030) from Docker image.
  • Remove support for unnecessary data sources templates inside subgraph data sources. They are only supported at the top level.
  • Avoid sending empty store events through the database.
  • Fix database connection deadlocks.
  • Rework the codebase to use anyhow instead of failure.
  • Log stack trace in case of database connection timeouts, to help with root-causing.
  • Fix stack overflows in GraphQL parsing.
  • Disable fulltext search by default (it is nondeterministic and therefore not currently supported in the network).

0.20.0

NOTE: JSONB storage is no longer supported. Do not upgrade to this release if you still have subgraphs that were deployed with a version before 0.16. They need to be redeployed before updating to this version.

You can check if you have JSONB subgraphs by running the query select count(*) from deployment_schemas where version='split' in psql. If that query returns 0, you do not have JSONB subgraphs and it is safe to upgrde to this version.

Feature: _meta field

Subgraphs sometimes fall behind, be it due to failing or the Graph Node may be having issues. The _meta field can now be added to any query so that it is possible to determine against which block the query was effectively executed. Applications can use this to warn users if the data becomes stale. It is as simple as adding this to your query:

_meta {
  block {
    number
    hash
  }
}

Feature: Non-fatal errors

Indexing errors on already synced subgraphs no longer need to cause the entire subgraph to grind to a halt. Subgraphs can now be configured to continue syncing in the presence of errors, by simply skipping the problematic handler. This gives subgraph authors time to correct their subgraphs while the nodes can continue to serve up-to-date the data. This requires setting a flag on the subgraph manifest:

features:
  - nonFatalErrors

And the query must also opt-in to querying data with potential inconsistencies:

foos(first: 100, subgraphError: allow) {
  id
}

If the subgraph encounters and error the query will return both the data and a graphql error with the message indexing_error.

Note that some errors are still fatal, to be non-fatal the error must be known to be deterministic. The _meta field can be used to check if the subgraph has skipped over errors:

_meta {
  hasIndexingErrors
}

The features section of the manifest requires depending on the graph-cli master branch until the next version (after 0.19.0) is released.

Ethereum

  • Support for tuple[] (#1973).
  • Support multiple Ethereum endpoints per network with different capabilities (#1810).

Performance

  • Avoid cloning results assembled from partial results (#1907).

Security

  • Add cargo-audit to the build process, update dependencies (#1998).

0.19.2

  • Add GRAPH_ETH_CALL_BY_NUMBER environment variable for disabling EIP-1898 (#1957).
  • Disable ipfs.cat by default, as it is non-deterministic (#1958).

0.19.1

  • Detect reorgs during query execution (#1801).
  • Annotate SQL queries with the GraphQL query ID that caused them (#1946).
  • Fix potential deadlock caused by reentering the load manager semaphore (#1948).
  • Fix fulltext query issue with optional and unset fields (#1937 via #1938).
  • Fix build warnings with --release (#1949 via #1953).
  • Dependency updates: async-trait, chrono, wasmparser.

0.19.0

  • Skip trace_filter on empty blocks (#1923).
  • Ensure runtime hosts are unique to avoid double-counting, improve logging (#1904).
  • Add administrative Postgres views (#1889).
  • Limit the GraphQL skip argument in the same way as we limit first (#1912).
  • Fix GraphQL fragment bugs (#1825).
  • Don't crash node and show better error when multiple graph nodes are indexing the same subgraph (#1903).
  • Add a query semaphore to allow to control the number of concurrent queries and subscription queries being executed (#1802).
  • Call Ethereum contracts by block hash (#1905).
  • Fix fetching the correct function ABI from the contract ABI (#1886).
  • Add LFU cache for historical queries (#1878, #1879, #1891).
  • Log GraphQL queries only once (#1873).
  • Gracefully fail on a null block hash and encoding failures in the Ethereum adapter (#1872).
  • Improve metrics by using labels more (#1868, ...)
  • Log when decoding a contract call result fails to decode (#1842).
  • Fix Ethereum node requirements parsing based on the manifest (#1834).
  • Speed up queries that involve checking for inclusion in an array (#1820).
  • Add better error message when blocking a query due to load management (#1822).
  • Support multiple Ethereum nodes/endpoints per network, with different capabilities (#1810).
  • Change how we index foreign keys (#1811).
  • Add an experimental Ethereum node config file (#1819).
  • Allow using GraphQL variables in block constraints (#1803).
  • Add Solidity struct array / Ethereum tuple array support (#1815).
  • Resolve subgraph names in a blocking task (#1797).
  • Add environmen variable options for sensitive arguments (#1784).
  • USe blocking task for store events (#1789).
  • Refactor servers, log GraphQL panics (#1783).
  • Remove excessive logging in the store (#1772).
  • Add dynamic load management for GraphQL queries (#1762, #1773, #1774).
  • Add ability to block certain queries (#1749, #1771).
  • Log the complexity of each query executed (#1752).
  • Add support for running against read-only Postgres replicas (#1746, #1748, #1753, #1750, #1754, #1860).
  • Catch invalid opcode reverts on Geth (#1744).
  • Optimize queries for single-object lookups (#1734).
  • Increase the maximum number of blocking threads (#1742).
  • Increase default JSON-RPC timeout (#1732).
  • Ignore flaky network indexers tests (#1724).
  • Change default max block range size to 1000 (#1727).
  • Fixed aliased scalar fields (#1726).
  • Fix issue inserting fulltext fields when all included field values are null (#1710).
  • Remove frequent "GraphQL query served" log message (#1719).
  • Fix bigDecimal.devidedBy (#1715).
  • Optimize GraphQL execution, remove non-prefetch code (#1712, #1730, #1733, #1743, #1775).
  • Add a query cache (#1708, #1709, #1747, #1751, #1777).
  • Support the new Geth revert format (#1713).
  • Switch WASM runtime from wasmi to wasmtime and cranelift (#1700).
  • Avoid adding order by clauses for single-object lookups (#1703).
  • Refactor chain head and store event listeners (#1693).
  • Properly escape single quotes in strings for SQL queries (#1695).
  • Revamp how Graph Node Docker image is built (#1644).
  • Add BRIN indexes to speed up revert handling (#1683).
  • Don't store chain head block in SubgraphDeployment entity (#1673).
  • Allow varying block constraints across different GraphQL query fields (#1685).
  • Handle database tables that have text columns where they should have enums (#1681).
  • Make contract call cache collision-free (#1680).
  • Fix a SQL query in cleanup_cached_blocks (#1672).
  • Exit process when panicking in the notification listener (#1671).
  • Rebase ethabi and web3 forks on top of upstream (#1662).
  • Remove parity-wasm dependency (#1663).
  • Normalize BigDecimal values, limit BigDecimal exponent (#1640).
  • Strip nulls from strings (#1656).
  • Fetch genesis block by number 0 instead of "earliest" (#1658).
  • Speed up GraphQL query execution (#1648).
  • Fetch event logs in parallel (#1646).
  • Cheaper block polling (#1646).
  • Improve indexing status API (#1609, #1655, #1659, #1718).
  • Log Postgres contention again (#1643).
  • Allow User-Agent in CORS headers (#1635).
  • Docker: Increase startup wait timeouts (Postgres, IPFS) to 120s (#1634).
  • Allow using Bytes for id fields (#1607).
  • Increase Postgres connection pool size (#1620).
  • Fix entities updated after being removed in the same block (#1632).
  • Pass log_index to mappings in place of transaction_log_index (required for Geth).
  • Don't return __typename to mappings (#1629).
  • Log warnings after 10 successive failed eth_call requests. This makes it more visible when graph-node is not operating against an Ethereum archive node (#1606).
  • Improve use of async/await across the codebase.
  • Add Proof Of Indexing (POI).
  • Add first implementation of subgraph grafting.
  • Add integration test for handling Ganache reverts (#1590).
  • Log all GraphQL and SQL queries performed by a node, controlled through the GRAPH_LOG_QUERY_TIMING environment variable (#1595).
  • Fix loading more than 200 dynamic data sources (#1596).
  • Fix fulltext schema validation (includes fields).
  • Dependency updates: anyhow, async-trait, bs58, blake3, bytes, chrono, clap, crossbeam-channel derive_more, diesel-derive-enum, duct, ethabi, git-testament, hex-literal, hyper, indexmap, jsonrpc-core, mockall, once_cell, petgraph, reqwest, semver, serde, serde_json, slog-term, tokio, wasmparser.

0.18.0

NOTE: JSONB storage is deprecated and will be removed in the next release. This only affects subgraphs that were deployed with a graph-node version before 0.16. Starting with this version, graph-node will print a warning for any subgraph that uses JSONB storage when that subgraph starts syncing. Please check your logs for this warning. You can remove the warning by redeploying the subgraph.

Feature: Fulltext Search (#1521)

A frequently requested feature has been support for more advanced text-based search, e.g. to power search fields in dApps. This release introduces a @fulltext directive on a new, reserved _Schema_ type to define fulltext search APIs that can then be used in queries. The example below shows how such an API can be defined in the subgraph schema:

type _Schema_
  @fulltext(
    name: "artistSearch"
    language: en
    algorithm: rank
    include: [
      {
        entity: "Artist"
        fields: [
          { name: "name" }
          { name: "bio" }
          { name: "genre" }
          { name: "promoCopy" }
        ]
      }
    ]
  )

This will add a special database column for Artist entities that can be used for fulltext search queries across all included entity fields, based on the tsvector and tsquery features provided by Postgres.

The @fulltext directive will also add an artistSearch field on the root query object to the generated subgraph GraphQL API, which can be used as follows:

{
  artistSearch(text: "breaks & electro & detroit") {
    id
    name
    bio
  }
}

For more information about the supported operators (like the & in the above query), please refer to the Postgres documentation.

Feature: 3Box Profiles (#1574)

3Box has become a popular solution for integrating user profiles into dApps. Starting with this release, it is possible to fetch profile data for Ethereum addresses and DIDs. Example usage:

import { box } from '@graphprotocol/graph-ts'

let profile = box.profile("0xc8d807011058fcc0FB717dcd549b9ced09b53404")
if (profile !== null) {
  let name = profile.get("name")
  ...
}

let profileFromDid = box.profile(
  "id:3:bafyreia7db37k7epoc4qaifound6hk7swpwfkhudvdug4bgccjw6dh77ue"
)
...

Feature: Arweave Transaction Data (#1574)

This release enables accessing Arweave transaction data using Arweave transaction IDs:

import { arweave, json } from '@graphprotocol/graph-ts'

let data = arweave.transactionData(
  "W2czhcswOAe4TgL4Q8kHHqoZ1jbFBntUCrtamYX_rOU"
)

if (data !== null) {
  let data = json.fromBytes(data)
  ...
}

Feature: Data Source Context (#1404 via #1537)

Data source contexts allow passing extra configuration when creating a data source from a template. As an example, let's say a subgraph tracks exchanges that are associated with a particular trading pair, which is included in the NewExchange event. That information can be passed into the dynamically created data source, like so:

import { DataSourceContext } from "@graphprotocol/graph-ts";
import { Exchange } from "../generated/templates";

export function handleNewExchange(event: NewExchange): void {
  let context = new DataSourceContext();
  context.setString("tradingPair", event.params.tradingPair);
  Exchange.createWithContext(event.params.exchange, context);
}

Inside a mapping of the Exchange template, the context can then be accessed as follows:

import { dataSource } from '@graphprotocol/graph-ts'

...

let context = dataSource.context()
let tradingPair = context.getString('tradingPair')

There are setters and getters like setString and getString for all value types to make working with data source contexts convenient.

Feature: Error Handling for JSON Parsing (#1588 via #1578)

With contracts anchoring JSON data on IPFS on chain, there is no guarantee that this data is actually valid JSON. Until now, failure to parse JSON in subgraph mappings would fail the subgraph. This release adds a new json.try_fromBytes host export that allows subgraph to gracefully handle JSON parsing errors.

import { json } from '@graphprotocol/graph-ts'

export function handleSomeEvent(event: SomeEvent): void {
  // JSON data as bytes, e.g. retrieved from IPFS
  let data = ...

  // This returns a `Result<JSONValue, boolean>`, meaning that the error type is
  // just a boolean (true if there was an error, false if parsing succeeded).
  // The actual error message is logged automatically.
  let result = json.try_fromBytes(data)

  if (result.isOk) { // or !result.isError
    // Do something with the JSON value
    let value = result.value
    ...
  } else {
    // Handle the error
    let error = result.error
    ...
  }
}

Ethereum

  • Add support for calling overloaded contract functions (#48 via #1440).
  • Add integration test for calling overloaded contract functions (#1441).
  • Avoid eth_getLogs requests with block ranges too large for Ethereum nodes to handle (#1536).
  • Simplify eth_getLogs fetching logic to reduce the risk of being rate limited by Ethereum nodes and the risk of overloading them (#1540).
  • Retry JSON-RPC responses with a -32000 error (Alchemy uses this for timeouts) (#1539).
  • Reduce block range size for trace_filter requests to prevent request timeouts out (#1547).
  • Fix loading dynamically created data sources with topic0 event handlers from the database (#1580).
  • Fix handling contract call reverts in newer versions of Ganache (#1591).

IPFS

  • Add support for checking multiple IPFS nodes when fetching files (#1498).

GraphQL

  • Use correct network when resolving block numbers in time travel queries (#1508).
  • Fix enum field validation in subgraph schemas (#1495).
  • Prevent WebSocket connections from hogging the blocking thread pool and freezing the node (#1522).

Database

  • Switch subgraph metadata from JSONB to relational storage (#1394 via #1454, #1457, #1459).
  • Clean up large notifications less frequently (#1505).
  • Add metric for Postgres connection errors (#1484).
  • Log SQL queries executed as part of the GraphQL API (#1465, #1466, #1468).
  • Log entities returned by SQL queries (#1503).
  • Fix several GraphQL prefetch / SQL query execution issues (#1523, #1524, #1526).
  • Print deprecation warnings for JSONB subgraphs (#1527).
  • Make sure reorg handling does not affect metadata of other subgraphs (#1538).

Performance

  • Maintain an in-memory entity cache across blocks to speed up store.get (#1381 via #1416).
  • Speed up revert handling by making use of cached blocks (#1449).
  • Speed up simple queries by delaying building JSON objects for results (#1476).
  • Resolve block numbers to hashes using cached blocks when possible (#1477).
  • Improve GraphQL prefetching performance by using lateral joins (#1450 via #1483).
  • Vastly reduce memory consumption when indexing data sources created from templates (#1494).

Misc

  • Default to IPFS 0.4.23 in the Docker Compose setup (#1592).
  • Support Elasticsearch endpoints without HTTP basic auth (#1576).
  • Fix --version not reporting the current version (#967 via #1567).
  • Convert more code to async/await and simplify async logic (#1558, #1560, #1571).
  • Use lossy, more tolerant UTF-8 conversion when converting strings to bytes (#1541).
  • Detect when a node is unresponsive and kill it (#1507).
  • Dump core when exiting because of a fatal error (#1512).
  • Update to futures 0.3 and tokio 0.2, enabling async/await (#1448).
  • Log block and full transaction hash when handlers fail (#1496).
  • Speed up network indexer tests (#1453).
  • Fix Travis to always install Node.js 11.x. (#1588).
  • Dependency updates: bytes, chrono, crossbeam-channel, ethabi, failure, futures, hex, hyper, indexmap, jsonrpc-http-server, num-bigint, priority-queue, reqwest, rust-web3, serde, serde_json, slog-async, slog-term, tokio, tokio-tungstenite, walkdir, url.